<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!-- NewPage --> <html lang="en"> <head> <!-- Generated by javadoc (version 1.7.0_45) on Thu Jan 09 22:45:26 GMT 2014 --> <title>SecondaryIndex</title> <meta name="date" content="2014-01-09"> <link rel="stylesheet" type="text/css" href="../../../stylesheet.css" title="Style"> </head> <body> <script type="text/javascript"><!-- if (location.href.indexOf('is-external=true') == -1) { parent.document.title="SecondaryIndex"; } //--> </script> <noscript> <div>JavaScript is disabled on your browser.</div> </noscript> <!-- ========= START OF TOP NAVBAR ======= --> <div class="topNav"><a name="navbar_top"> <!-- --> </a><a href="#skip-navbar_top" title="Skip navigation links"></a><a name="navbar_top_firstrow"> <!-- --> </a> <ul class="navList" title="Navigation"> <li><a href="../../../overview-summary.html">Overview</a></li> <li><a href="package-summary.html">Package</a></li> <li class="navBarCell1Rev">Class</li> <li><a href="package-tree.html">Tree</a></li> <li><a href="../../../deprecated-list.html">Deprecated</a></li> <li><a href="../../../index-all.html">Index</a></li> <li><a href="../../../help-doc.html">Help</a></li> </ul> </div> <div class="subNav"> <ul class="navList"> <li><a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><span class="strong">Prev Class</span></a></li> <li><a href="../../../com/sleepycat/persist/StoreConfig.html" title="class in com.sleepycat.persist"><span class="strong">Next Class</span></a></li> </ul> <ul class="navList"> <li><a href="../../../index.html?com/sleepycat/persist/SecondaryIndex.html" target="_top">Frames</a></li> <li><a href="SecondaryIndex.html" target="_top">No Frames</a></li> </ul> <ul class="navList" id="allclasses_navbar_top"> <li><a href="../../../allclasses-noframe.html">All Classes</a></li> </ul> <div> <script type="text/javascript"><!-- allClassesLink = document.getElementById("allclasses_navbar_top"); if(window==top) { allClassesLink.style.display = "block"; } else { allClassesLink.style.display = "none"; } //--> </script> </div> <div> <ul class="subNavList"> <li>Summary: </li> <li>Nested | </li> <li>Field | </li> <li><a href="#constructor_summary">Constr</a> | </li> <li><a href="#method_summary">Method</a></li> </ul> <ul class="subNavList"> <li>Detail: </li> <li>Field | </li> <li><a href="#constructor_detail">Constr</a> | </li> <li><a href="#method_detail">Method</a></li> </ul> </div> <a name="skip-navbar_top"> <!-- --> </a></div> <!-- ========= END OF TOP NAVBAR ========= --> <!-- ======== START OF CLASS DATA ======== --> <div class="header"> <div class="subTitle">com.sleepycat.persist</div> <h2 title="Class SecondaryIndex" class="title">Class SecondaryIndex<SK,PK,E></h2> </div> <div class="contentContainer"> <ul class="inheritance"> <li>java.lang.Object</li> <li> <ul class="inheritance"> <li>com.sleepycat.persist.SecondaryIndex<SK,PK,E></li> </ul> </li> </ul> <div class="description"> <ul class="blockList"> <li class="blockList"> <dl> <dt>All Implemented Interfaces:</dt> <dd><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><SK,E></dd> </dl> <hr> <br> <pre>public class <span class="strong">SecondaryIndex<SK,PK,E></span> extends java.lang.Object</pre> <div class="block">The secondary index for an entity class and a secondary key. <p><code>SecondaryIndex</code> objects are thread-safe. Multiple threads may safely call the methods of a shared <code>SecondaryIndex</code> object.</p> <p><code>SecondaryIndex</code> implements <a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist"><code>EntityIndex</code></a> to map the secondary key type (SK) to the entity type (E). In other words, entities are accessed by secondary key values.</p> <p>The <a href="../../../com/sleepycat/persist/model/SecondaryKey.html" title="annotation in com.sleepycat.persist.model"><code>SecondaryKey</code></a> annotation may be used to define a secondary key as shown in the following example.</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=MANY_TO_ONE) String department; String name; private Employee() {} }</pre> <p>Before obtaining a <code>SecondaryIndex</code>, the <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a> must be obtained for the entity class. To obtain the <code>SecondaryIndex</code> call <a href="../../../com/sleepycat/persist/EntityStore.html#getSecondaryIndex(com.sleepycat.persist.PrimaryIndex, java.lang.Class, java.lang.String)"><code>EntityStore.getSecondaryIndex</code></a>, passing the primary index, the secondary key class and the secondary key name. For example:</p> <pre class="code"> EntityStore store = new EntityStore(...); <code>PrimaryIndex<Long,Employee></code> primaryIndex = store.getPrimaryIndex(Long.class, Employee.class); <code>SecondaryIndex<String,Long,Employee></code> secondaryIndex = store.getSecondaryIndex(primaryIndex, String.class, "department");</pre> <p>Since <code>SecondaryIndex</code> implements the <a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist"><code>EntityIndex</code></a> interface, it shares the common index methods for retrieving and deleting entities, opening cursors and using transactions. See <a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist"><code>EntityIndex</code></a> for more information on these topics.</p> <p><code>SecondaryIndex</code> does <em>not</em> provide methods for inserting and updating entities. That must be done using the <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a>.</p> <p>Note that a <code>SecondaryIndex</code> has three type parameters <code><SK,PK,E></code> or in the example <code><String,Long,Employee></code> while a <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a> has only two type parameters <code><PK,E></code> or <code><Long,Employee></code>. This is because a <code>SecondaryIndex</code> has an extra level of mapping: It maps from secondary key to primary key, and then from primary key to entity. For example, consider this entity:</p> <p><table class="code" border="1"> <tr><th>ID</th><th>Department</th><th>Name</th></tr> <tr><td>1</td><td>Engineering</td><td>Jane Smith</td></tr> </table></p> <p>The <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a> maps from id directly to the entity, or from primary key 1 to the "Jane Smith" entity in the example. The <code>SecondaryIndex</code> maps from department to id, or from secondary key "Engineering" to primary key 1 in the example, and then uses the <code>PrimaryIndex</code> to map from the primary key to the entity.</p> <p>Because of this extra type parameter and extra level of mapping, a <code>SecondaryIndex</code> can provide more than one mapping, or view, of the entities in the primary index. The main mapping of a <code>SecondaryIndex</code> is to map from secondary key (SK) to entity (E), or in the example, from the String department key to the Employee entity. The <code>SecondaryIndex</code> itself, by implementing <code>EntityIndex<SK,E></code>, provides this mapping.</p> <p>The second mapping provided by <code>SecondaryIndex</code> is from secondary key (SK) to primary key (PK), or in the example, from the String department key to the Long id key. The <a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>keysIndex</code></a> method provides this mapping. When accessing the keys index, the primary key is returned rather than the entity. When only the primary key is needed and not the entire entity, using the keys index is less expensive than using the secondary index because the primary index does not have to be accessed.</p> <p>The third mapping provided by <code>SecondaryIndex</code> is from primary key (PK) to entity (E), for the subset of entities having a given secondary key (SK). This mapping is provided by the <a href="../../../com/sleepycat/persist/SecondaryIndex.html#subIndex(SK)"><code>subIndex(SK)</code></a> method. A sub-index is convenient when you are interested in working with the subset of entities having a particular secondary key value, for example, all employees in a given department.</p> <p>All three mappings, along with the mapping provided by the <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a>, are shown using example data in the <a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist"><code>EntityIndex</code></a> interface documentation. See <a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist"><code>EntityIndex</code></a> for more information.</p> <p>Note that when using an index, keys and values are stored and retrieved by value not by reference. In other words, if an entity object is stored and then retrieved, or retrieved twice, each object will be a separate instance. For example, in the code below the assertion will always fail.</p> <pre class="code"> MyKey key = ...; MyEntity entity1 = index.get(key); MyEntity entity2 = index.get(key); assert entity1 == entity2; // always fails! </pre> <h3>One-to-One Relationships</h3> <p>A <a href="../../../com/sleepycat/persist/model/Relationship.html#ONE_TO_ONE"><code>ONE_TO_ONE</code></a> relationship, although less common than other types of relationships, is the simplest type of relationship. A single entity is related to a single secondary key value. For example:</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=ONE_TO_ONE) String ssn; String name; private Employee() {} } <code>SecondaryIndex<String,Long,Employee></code> employeeBySsn = store.getSecondaryIndex(primaryIndex, String.class, "ssn");</pre> <p>With a <a href="../../../com/sleepycat/persist/model/Relationship.html#ONE_TO_ONE"><code>ONE_TO_ONE</code></a> relationship, the secondary key must be unique; in other words, no two entities may have the same secondary key value. If an attempt is made to store an entity having the same secondary key value as another existing entity, a <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db"><code>DatabaseException</code></a> will be thrown.</p> <p>Because the secondary key is unique, it is useful to lookup entities by secondary key using <a href="../../../com/sleepycat/persist/EntityIndex.html#get(K)"><code>EntityIndex.get(K)</code></a>. For example:</p> <pre class="code"> Employee employee = employeeBySsn.get(mySsn);</pre> <h3>Many-to-One Relationships</h3> <p>A <a href="../../../com/sleepycat/persist/model/Relationship.html#MANY_TO_ONE"><code>MANY_TO_ONE</code></a> relationship is the most common type of relationship. One or more entities is related to a single secondary key value. For example:</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=MANY_TO_ONE) String department; String name; private Employee() {} } <code>SecondaryIndex<String,Long,Employee></code> employeeByDepartment = store.getSecondaryIndex(primaryIndex, String.class, "department");</pre> <p>With a <a href="../../../com/sleepycat/persist/model/Relationship.html#MANY_TO_ONE"><code>MANY_TO_ONE</code></a> relationship, the secondary key is not required to be unique; in other words, more than one entity may have the same secondary key value. In this example, more than one employee may belong to the same department.</p> <p>The most convenient way to access the employees in a given department is by using a sub-index. For example:</p> <pre class="code"> <code>EntityIndex<Long,Entity></code> subIndex = employeeByDepartment.subIndex(myDept); <code>EntityCursor<Employee></code> cursor = subIndex.entities(); try { for (Employee entity : cursor) { // Do something with the entity... } } finally { cursor.close(); }</pre> <h3>One-to-Many Relationships</h3> <p>In a <a href="../../../com/sleepycat/persist/model/Relationship.html#ONE_TO_MANY"><code>ONE_TO_MANY</code></a> relationship, a single entity is related to one or more secondary key values. For example:</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=ONE_TO_MANY) Set<String> emailAddresses = new HashSet<String>; String name; private Employee() {} } <code>SecondaryIndex<String,Long,Employee></code> employeeByEmail = store.getSecondaryIndex(primaryIndex, String.class, "emailAddresses");</pre> <p>With a <a href="../../../com/sleepycat/persist/model/Relationship.html#ONE_TO_MANY"><code>ONE_TO_MANY</code></a> relationship, the secondary key must be unique; in other words, no two entities may have the same secondary key value. In this example, no two employees may have the same email address. If an attempt is made to store an entity having the same secondary key value as another existing entity, a <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db"><code>DatabaseException</code></a> will be thrown.</p> <p>Because the secondary key is unique, it is useful to lookup entities by secondary key using <a href="../../../com/sleepycat/persist/EntityIndex.html#get(K)"><code>EntityIndex.get(K)</code></a>. For example:</p> <pre class="code"> Employee employee = employeeByEmail.get(myEmailAddress);</pre> <p>The secondary key field for a <a href="../../../com/sleepycat/persist/model/Relationship.html#ONE_TO_MANY"><code>ONE_TO_MANY</code></a> relationship must be an array or collection type. To access the email addresses of an employee, simply access the collection field directly. For example:</p> <pre class="code"> Employee employee = primaryIndex.get(1); // Get the entity by primary key employee.emailAddresses.add(myNewEmail); // Add an email address primaryIndex.putNoReturn(1, employee); // Update the entity</pre> <h3>Many-to-Many Relationships</h3> <p>In a <a href="../../../com/sleepycat/persist/model/Relationship.html#MANY_TO_MANY"><code>MANY_TO_MANY</code></a> relationship, one or more entities is related to one or more secondary key values. For example:</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=MANY_TO_MANY) Set<String> organizations = new HashSet<String>; String name; private Employee() {} } <code>SecondaryIndex<String,Long,Employee></code> employeeByOrganization = store.getSecondaryIndex(primaryIndex, String.class, "organizations");</pre> <p>With a <a href="../../../com/sleepycat/persist/model/Relationship.html#MANY_TO_MANY"><code>MANY_TO_MANY</code></a> relationship, the secondary key is not required to be unique; in other words, more than one entity may have the same secondary key value. In this example, more than one employee may belong to the same organization.</p> <p>The most convenient way to access the employees in a given organization is by using a sub-index. For example:</p> <pre class="code"> <code>EntityIndex<Long,Entity></code> subIndex = employeeByOrganization.subIndex(myOrg); <code>EntityCursor<Employee></code> cursor = subIndex.entities(); try { for (Employee entity : cursor) { // Do something with the entity... } } finally { cursor.close(); }</pre> <p>The secondary key field for a <a href="../../../com/sleepycat/persist/model/Relationship.html#MANY_TO_MANY"><code>MANY_TO_MANY</code></a> relationship must be an array or collection type. To access the organizations of an employee, simply access the collection field directly. For example:</p> <pre class="code"> Employee employee = primaryIndex.get(1); // Get the entity by primary key employee.organizations.remove(myOldOrg); // Remove an organization primaryIndex.putNoReturn(1, employee); // Update the entity</pre> <h3>Foreign Key Constraints for Related Entities</h3> <p>In all the examples above the secondary key is treated only as a simple value, such as a <code>String</code> department field. In many cases, that is sufficient. But in other cases, you may wish to constrain the secondary keys of one entity class to be valid primary keys of another entity class. For example, a Department entity may also be defined:</p> <pre class="code"> @Entity class Department { @PrimaryKey String name; String missionStatement; private Department() {} }</pre> <p>You may wish to constrain the department field values of the Employee class in the examples above to be valid primary keys of the Department entity class. In other words, you may wish to ensure that the department field of an Employee will always refer to a valid Department entity.</p> <p>You can implement this constraint yourself by validating the department field before you store an Employee. For example:</p> <pre class="code"> <code>PrimaryIndex<String,Department></code> departmentIndex = store.getPrimaryIndex(String.class, Department.class); void storeEmployee(Employee employee) throws DatabaseException { if (departmentIndex.contains(employee.department)) { primaryIndex.putNoReturn(employee); } else { throw new IllegalArgumentException("Department does not exist: " + employee.department); } }</pre> <p>Or, instead you could define the Employee department field as a foreign key, and this validation will be done for you when you attempt to store the Employee entity. For example:</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Department.class) String department; String name; private Employee() {} }</pre> <p>The <code>relatedEntity=Department.class</code> above defines the department field as a foreign key that refers to a Department entity. Whenever a Employee entity is stored, its department field value will be checked to ensure that a Department entity exists with that value as its primary key. If no such Department entity exists, then a <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db"><code>DatabaseException</code></a> is thrown, causing the transaction to be aborted (assuming that transactions are used).</p> <p>This begs the question: What happens when a Department entity is deleted while one or more Employee entities have department fields that refer to the deleted department's primary key? If the department were allowed to be deleted, the foreign key constraint for the Employee department field would be violated, because the Employee department field would refer to a department that does not exist.</p> <p>By default, when this situation arises the system does not allow the department to be deleted. Instead, a <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db"><code>DatabaseException</code></a> is thrown, causing the transaction to be aborted. In this case, in order to delete a department, the department field of all Employee entities must first be updated to refer to a different existing department, or set to null. This is the responsibility of the application.</p> <p>There are two additional ways of handling deletion of a Department entity. These alternatives are configured using the <a href="../../../com/sleepycat/persist/model/SecondaryKey.html#onRelatedEntityDelete()"><code>SecondaryKey.onRelatedEntityDelete()</code></a> annotation property. Setting this property to <a href="../../../com/sleepycat/persist/model/DeleteAction.html#NULLIFY"><code>DeleteAction.NULLIFY</code></a> causes the Employee department field to be automatically set to null when the department they refer to is deleted. This may or may not be desirable, depending on application policies. For example:</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; <code>@SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Department.class, onRelatedEntityDelete=NULLIFY)</code> String department; String name; private Employee() {} }</pre> <p>The <a href="../../../com/sleepycat/persist/model/DeleteAction.html#CASCADE"><code>DeleteAction.CASCADE</code></a> value, on the other hand, causes the Employee entities to be automatically deleted when the department they refer to is deleted. This is probably not desirable in this particular example, but is useful for parent-child relationships. For example:</p> <pre class="code"> @Entity class Order { @PrimaryKey long id; String description; private Order() {} } @Entity class OrderItem { @PrimaryKey long id; <code>@SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Order.class, onRelatedEntityDelete=CASCADE)</code> long orderId; String description; private OrderItem() {} }</pre> <p>The OrderItem orderId field refers to its "parent" Order entity. When an Order entity is deleted, it may be useful to automatically delete its "child" OrderItem entities.</p> <p>For more information, see <a href="../../../com/sleepycat/persist/model/SecondaryKey.html#onRelatedEntityDelete()"><code>SecondaryKey.onRelatedEntityDelete()</code></a>.</p> <h3>One-to-Many versus Many-to-One for Related Entities</h3> <p>When there is a conceptual Many-to-One relationship such as Employee to Department as illustrated in the examples above, the relationship may be implemented either as Many-to-One in the Employee class or as One-to-Many in the Department class.</p> <p>Here is the Many-to-One approach.</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Department.class) String department; String name; private Employee() {} } @Entity class Department { @PrimaryKey String name; String missionStatement; private Department() {} }</pre> <p>And here is the One-to-Many approach.</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; String name; private Employee() {} } @Entity class Department { @PrimaryKey String name; String missionStatement; @SecondaryKey(relate=ONE_TO_MANY, relatedEntity=Employee.class) Set<Long> employees = new HashSet<Long>; private Department() {} }</pre> <p>Which approach is best? The Many-to-One approach better handles large number of entities on the to-Many side of the relationship because it doesn't store a collection of keys as an entity field. With Many-to-One a Btree is used to store the collection of keys and the Btree can easily handle very large numbers of keys. With One-to-Many, each time a related key is added or removed the entity on the One side of the relationship, along with the complete collection of related keys, must be updated. Therefore, if large numbers of keys may be stored per relationship, Many-to-One is recommended.</p> <p>If the number of entities per relationship is not a concern, then you may wish to choose the approach that is most natural in your application data model. For example, if you think of a Department as containing employees and you wish to modify the Department object each time an employee is added or removed, then you may wish to store a collection of Employee keys in the Department object (One-to-Many).</p> <p>Note that if you have a One-to-Many relationship and there is no related entity, then you don't have a choice -- you have to use One-to-Many because there is no entity on the to-Many side of the relationship where a Many-to-One key could be defined. An example is the Employee to email addresses relationship discussed above:</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=ONE_TO_MANY) Set<String> emailAddresses = new HashSet<String>; String name; private Employee() {} }</pre> <p>For sake of argument imagine that each employee has thousands of email addresses and employees frequently add and remove email addresses. To avoid the potential performance problems associated with updating the Employee entity every time an email address is added or removed, you could create an EmployeeEmailAddress entity and use a Many-to-One relationship as shown below:</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; String name; private Employee() {} } @Entity class EmployeeEmailAddress { @PrimaryKey String emailAddress; @SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Employee.class) long employeeId; private EmployeeEmailAddress() {} }</pre> <h3>Key Placement with Many-to-Many for Related Entities</h3> <p>As discussed in the section above, one drawback of a to-Many relationship (One-to-Many was discussed above and Many-to-Many is discussed here) is that it requires storing a collection of keys in an entity. Each time a key is added or removed, the containing entity must be updated. This has potential performance problems when there are large numbers of entities on the to-Many side of the relationship, in other words, when there are large numbers of keys in each secondary key field collection.</p> <p>If you have a Many-to-Many relationship with a reasonably small number of entities on one side of the relationship and a large number of entities on the other side, you can avoid the potential performance problems by defining the secondary key field on the side with a small number of entities.</p> <p>For example, in an Employee-to-Organization relationship, the number of organizations per employee will normally be reasonably small but the number of employees per organization may be very large. Therefore, to avoid potential performance problems, the secondary key field should be defined in the Employee class as shown below.</p> <pre class="code"> @Entity class Employee { @PrimaryKey long id; @SecondaryKey(relate=MANY_TO_MANY, relatedEntity=Organization.class) Set<String> organizations = new HashSet<String>; String name; private Employee() {} } @Entity class Organization { @PrimaryKey String name; String description; }</pre> <p>If instead a <code>Set<Long> members</code> key had been defined in the Organization class, this set could potentially have a large number of elements and performance problems could result.</p> <h3>Many-to-Many Versus a Relationship Entity</h3> <p>If you have a Many-to-Many relationship with a large number of entities on <em>both</em> sides of the relationship, you can avoid the potential performance problems by using a <em>relationship entity</em>. A relationship entity defines the relationship between two other entities using two Many-to-One relationships.</p> <p>Imagine a relationship between cars and trucks indicating whenever a particular truck was passed on the road by a particular car. A given car may pass a large number of trucks and a given truck may be passed by a large number of cars. First look at a Many-to-Many relationship between these two entities:</p> <pre class="code"> @Entity class Car { @PrimaryKey String licenseNumber; @SecondaryKey(relate=MANY_TO_MANY, relatedEntity=Truck.class) Set<String> trucksPassed = new HashSet<String>; String color; private Car() {} } @Entity class Truck { @PrimaryKey String licenseNumber; int tons; private Truck() {} }</pre> <p>With the Many-to-Many approach above, the <code>trucksPassed</code> set could potentially have a large number of elements and performance problems could result.</p> <p>To apply the relationship entity approach we define a new entity class named CarPassedTruck representing a single truck passed by a single car. We remove the secondary key from the Car class and use two secondary keys in the CarPassedTruck class instead.</p> <pre class="code"> @Entity class Car { @PrimaryKey String licenseNumber; String color; private Car() {} } @Entity class Truck { @PrimaryKey String licenseNumber; int tons; private Truck() {} } @Entity class CarPassedTruck { @PrimaryKey long id; @SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Car.class) String carLicense; @SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Truck.class) String truckLicense; private CarPassedTruck() {} }</pre> <p>The CarPassedTruck entity can be used to access the relationship by car license or by truck license.</p> <p>You may use the relationship entity approach because of the potential performance problems mentioned above. Or, you may choose to use this approach in order to store other information about the relationship. For example, if for each car that passes a truck you wish to record how much faster the car was going than the truck, then a relationship entity is the logical place to store that property. In the example below the speedDifference property is added to the CarPassedTruck class.</p> <pre class="code"> @Entity class CarPassedTruck { @PrimaryKey long id; @SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Car.class) String carLicense; @SecondaryKey(relate=MANY_TO_ONE, relatedEntity=Truck.class) String truckLicense; int speedDifference; private CarPassedTruck() {} }</pre> <p>Be aware that the relationship entity approach adds overhead compared to Many-to-Many. There is one additional entity and one additional secondary key. These factors should be weighed against its advantages and the relevant application access patterns should be considered.</p></div> </li> </ul> </div> <div class="summary"> <ul class="blockList"> <li class="blockList"> <!-- ======== CONSTRUCTOR SUMMARY ======== --> <ul class="blockList"> <li class="blockList"><a name="constructor_summary"> <!-- --> </a> <h3>Constructor Summary</h3> <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> <caption><span>Constructors</span><span class="tabEnd"> </span></caption> <tr> <th class="colOne" scope="col">Constructor and Description</th> </tr> <tr class="altColor"> <td class="colOne"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#SecondaryIndex(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.Database, com.sleepycat.persist.PrimaryIndex, java.lang.Class, com.sleepycat.bind.EntryBinding)">SecondaryIndex</a></strong>(<a href="../../../com/sleepycat/db/SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</a> database, <a href="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</a> keysDatabase, <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">PK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>> primaryIndex, java.lang.Class<<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>> secondaryKeyClass, <a href="../../../com/sleepycat/bind/EntryBinding.html" title="interface in com.sleepycat.bind">EntryBinding</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>> secondaryKeyBinding)</code> <div class="block">Creates a secondary index without using an <code>EntityStore</code>.</div> </td> </tr> </table> </li> </ul> <!-- ========== METHOD SUMMARY =========== --> <ul class="blockList"> <li class="blockList"><a name="method_summary"> <!-- --> </a> <h3>Method Summary</h3> <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> <caption><span>Methods</span><span class="tabEnd"> </span></caption> <tr> <th class="colFirst" scope="col">Modifier and Type</th> <th class="colLast" scope="col">Method and Description</th> </tr> <tr class="altColor"> <td class="colFirst"><code>boolean</code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#contains(K)">contains</a></strong>(K key)</code> <div class="block">Checks for existence of a key in this index.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>boolean</code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#contains(com.sleepycat.db.Transaction, K, com.sleepycat.db.LockMode)">contains</a></strong>(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, K key, <a href="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</a> lockMode)</code> <div class="block">Checks for existence of a key in this index.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>long</code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#count()">count</a></strong>()</code> <div class="block">Returns a non-transactional count of the entities in this index.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>boolean</code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#delete(K)">delete</a></strong>(K key)</code> <div class="block">Deletes all entities with a given index key.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>boolean</code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#delete(com.sleepycat.db.Transaction, K)">delete</a></strong>(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, K key)</code> <div class="block">Deletes all entities with a given index key.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><E></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#entities()">entities</a></strong>()</code> <div class="block">Opens a cursor for traversing all entities in this index.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><E></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#entities(K, boolean, K, boolean)">entities</a></strong>(K fromKey, boolean fromInclusive, K toKey, boolean toInclusive)</code> <div class="block">Opens a cursor for traversing entities in a key range.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><E></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#entities(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)">entities</a></strong>(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, <a href="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</a> config)</code> <div class="block">Opens a cursor for traversing all entities in this index.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><E></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#entities(com.sleepycat.db.Transaction, K, boolean, K, boolean, com.sleepycat.db.CursorConfig)">entities</a></strong>(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, K fromKey, boolean fromInclusive, K toKey, boolean toInclusive, <a href="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</a> config)</code> <div class="block">Opens a cursor for traversing entities in a key range.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#get(SK)">get</a></strong>(<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a> key)</code> <div class="block">Gets an entity via a key of this index.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#get(com.sleepycat.db.Transaction, SK, com.sleepycat.db.LockMode)">get</a></strong>(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, <a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a> key, <a href="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</a> lockMode)</code> <div class="block">Gets an entity via a key of this index.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/db/SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</a></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#getDatabase()">getDatabase</a></strong>()</code> <div class="block">Returns the underlying secondary database for this index.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/bind/EntryBinding.html" title="interface in com.sleepycat.bind">EntryBinding</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#getKeyBinding()">getKeyBinding</a></strong>()</code> <div class="block">Returns the secondary key binding for the index.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>java.lang.Class<<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#getKeyClass()">getKeyClass</a></strong>()</code> <div class="block">Returns the secondary key class for this index.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</a></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#getKeysDatabase()">getKeysDatabase</a></strong>()</code> <div class="block">Returns the underlying secondary database that is not associated with the primary database and is used for the <a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>keysIndex</code></a>.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">PK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#getPrimaryIndex()">getPrimaryIndex</a></strong>()</code> <div class="block">Returns the primary index associated with this secondary index.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><K></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#keys()">keys</a></strong>()</code> <div class="block">Opens a cursor for traversing all keys in this index.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><K></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#keys(K, boolean, K, boolean)">keys</a></strong>(K fromKey, boolean fromInclusive, K toKey, boolean toInclusive)</code> <div class="block">Opens a cursor for traversing keys in a key range.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><K></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#keys(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)">keys</a></strong>(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, <a href="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</a> config)</code> <div class="block">Opens a cursor for traversing all keys in this index.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><K></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#keys(com.sleepycat.db.Transaction, K, boolean, K, boolean, com.sleepycat.db.CursorConfig)">keys</a></strong>(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, K fromKey, boolean fromInclusive, K toKey, boolean toInclusive, <a href="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</a> config)</code> <div class="block">Opens a cursor for traversing keys in a key range.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">PK</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex()">keysIndex</a></strong>()</code> <div class="block">Returns a read-only keys index that maps secondary key to primary key.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>java.util.Map<<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#map()">map</a></strong>()</code> <div class="block">Returns a standard Java map based on this entity index.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>java.util.SortedMap<<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#sortedMap()">sortedMap</a></strong>()</code> <div class="block">Returns a standard Java sorted map based on this entity index.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">PK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/SecondaryIndex.html#subIndex(SK)">subIndex</a></strong>(<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a> key)</code> <div class="block">Returns an index that maps primary key to entity for the subset of entities having a given secondary key (duplicates).</div> </td> </tr> </table> <ul class="blockList"> <li class="blockList"><a name="methods_inherited_from_class_java.lang.Object"> <!-- --> </a> <h3>Methods inherited from class java.lang.Object</h3> <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> </ul> </li> </ul> </li> </ul> </div> <div class="details"> <ul class="blockList"> <li class="blockList"> <!-- ========= CONSTRUCTOR DETAIL ======== --> <ul class="blockList"> <li class="blockList"><a name="constructor_detail"> <!-- --> </a> <h3>Constructor Detail</h3> <a name="SecondaryIndex(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.Database, com.sleepycat.persist.PrimaryIndex, java.lang.Class, com.sleepycat.bind.EntryBinding)"> <!-- --> </a> <ul class="blockListLast"> <li class="blockList"> <h4>SecondaryIndex</h4> <pre>public SecondaryIndex(<a href="../../../com/sleepycat/db/SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</a> database, <a href="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</a> keysDatabase, <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">PK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>> primaryIndex, java.lang.Class<<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>> secondaryKeyClass, <a href="../../../com/sleepycat/bind/EntryBinding.html" title="interface in com.sleepycat.bind">EntryBinding</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>> secondaryKeyBinding) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block">Creates a secondary index without using an <code>EntityStore</code>. When using an <a href="../../../com/sleepycat/persist/EntityStore.html" title="class in com.sleepycat.persist"><code>EntityStore</code></a>, call <a href="../../../com/sleepycat/persist/EntityStore.html#getSecondaryIndex(com.sleepycat.persist.PrimaryIndex, java.lang.Class, java.lang.String)"><code>getSecondaryIndex</code></a> instead. <p>This constructor is not normally needed and is provided for applications that wish to use custom bindings along with the Direct Persistence Layer. Normally, <a href="../../../com/sleepycat/persist/EntityStore.html#getSecondaryIndex(com.sleepycat.persist.PrimaryIndex, java.lang.Class, java.lang.String)"><code>getSecondaryIndex</code></a> is used instead.</p></div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>database</code> - the secondary database used for all access other than via a <a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>keysIndex</code></a>.</dd><dd><code>keysDatabase</code> - another handle on the secondary database, opened without association to the primary, and used only for access via a <a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>keysIndex</code></a>. If this argument is null and the <a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>keysIndex</code></a> method is called, then the keys database will be opened automatically; however, the user is then responsible for closing the keys database. To get the keys database in order to close it, call <a href="../../../com/sleepycat/persist/SecondaryIndex.html#getKeysDatabase()"><code>getKeysDatabase()</code></a>.</dd><dd><code>primaryIndex</code> - the primary index associated with this secondary index.</dd><dd><code>secondaryKeyClass</code> - the class of the secondary key.</dd><dd><code>secondaryKeyBinding</code> - the binding to be used for secondary keys.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> </li> </ul> <!-- ============ METHOD DETAIL ========== --> <ul class="blockList"> <li class="blockList"><a name="method_detail"> <!-- --> </a> <h3>Method Detail</h3> <a name="getDatabase()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>getDatabase</h4> <pre>public <a href="../../../com/sleepycat/db/SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</a> getDatabase()</pre> <div class="block">Returns the underlying secondary database for this index.</div> <dl><dt><span class="strong">Returns:</span></dt><dd>the secondary database.</dd></dl> </li> </ul> <a name="getKeysDatabase()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>getKeysDatabase</h4> <pre>public <a href="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</a> getKeysDatabase()</pre> <div class="block">Returns the underlying secondary database that is not associated with the primary database and is used for the <a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>keysIndex</code></a>.</div> <dl><dt><span class="strong">Returns:</span></dt><dd>the keys database.</dd></dl> </li> </ul> <a name="getPrimaryIndex()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>getPrimaryIndex</h4> <pre>public <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">PK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>> getPrimaryIndex()</pre> <div class="block">Returns the primary index associated with this secondary index.</div> <dl><dt><span class="strong">Returns:</span></dt><dd>the primary index.</dd></dl> </li> </ul> <a name="getKeyClass()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>getKeyClass</h4> <pre>public java.lang.Class<<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>> getKeyClass()</pre> <div class="block">Returns the secondary key class for this index.</div> <dl><dt><span class="strong">Returns:</span></dt><dd>the class.</dd></dl> </li> </ul> <a name="getKeyBinding()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>getKeyBinding</h4> <pre>public <a href="../../../com/sleepycat/bind/EntryBinding.html" title="interface in com.sleepycat.bind">EntryBinding</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>> getKeyBinding()</pre> <div class="block">Returns the secondary key binding for the index.</div> <dl><dt><span class="strong">Returns:</span></dt><dd>the key binding.</dd></dl> </li> </ul> <a name="keysIndex()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>keysIndex</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">PK</a>> keysIndex() throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block">Returns a read-only keys index that maps secondary key to primary key. When accessing the keys index, the primary key is returned rather than the entity. When only the primary key is needed and not the entire entity, using the keys index is less expensive than using the secondary index because the primary index does not have to be accessed. <p>Note the following in the unusual case that you are <em>not</em> using an <code>EntityStore</code>: This method will open the keys database, a second database handle for the secondary database, if it is not already open. In this case, if you are <em>not</em> using an <code>EntityStore</code>, then you are responsible for closing the database returned by <a href="../../../com/sleepycat/persist/SecondaryIndex.html#getKeysDatabase()"><code>getKeysDatabase()</code></a> before closing the environment. If you <em>are</em> using an <code>EntityStore</code>, the keys database will be closed automatically by <a href="../../../com/sleepycat/persist/EntityStore.html#close()"><code>EntityStore.close()</code></a>.</p></div> <dl><dt><span class="strong">Returns:</span></dt><dd>the keys index.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="subIndex(java.lang.Object)"> <!-- --> </a><a name="subIndex(SK)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>subIndex</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">PK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>> subIndex(<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a> key) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block">Returns an index that maps primary key to entity for the subset of entities having a given secondary key (duplicates). A sub-index is convenient when you are interested in working with the subset of entities having a particular secondary key value. <p>When using a <a href="../../../com/sleepycat/persist/model/Relationship.html#MANY_TO_ONE"><code>MANY_TO_ONE</code></a> or <a href="../../../com/sleepycat/persist/model/Relationship.html#MANY_TO_MANY"><code>MANY_TO_MANY</code></a> secondary key, the sub-index represents the left (MANY) side of a relationship.</p></div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - the secondary key that identifies the entities in the sub-index.</dd> <dt><span class="strong">Returns:</span></dt><dd>the sub-index.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="get(java.lang.Object)"> <!-- --> </a><a name="get(SK)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>get</h4> <pre>public <a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a> get(<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a> key) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#get(K)">EntityIndex</a></code></strong></div> <div class="block">Gets an entity via a key of this index. <p>The operation will not be transaction protected, and <a href="../../../com/sleepycat/db/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a> is used implicitly.</p></div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - the key to search for.</dd> <dt><span class="strong">Returns:</span></dt><dd>the value mapped to the given key, or null if the key is not present in the index.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="get(com.sleepycat.db.Transaction,java.lang.Object,com.sleepycat.db.LockMode)"> <!-- --> </a><a name="get(com.sleepycat.db.Transaction, SK, com.sleepycat.db.LockMode)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>get</h4> <pre>public <a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a> get(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, <a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a> key, <a href="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</a> lockMode) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#get(com.sleepycat.db.Transaction, K, com.sleepycat.db.LockMode)">EntityIndex</a></code></strong></div> <div class="block">Gets an entity via a key of this index.</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - the transaction used to protect this operation, or null if the operation should not be transaction protected.</dd><dd><code>key</code> - the key to search for.</dd><dd><code>lockMode</code> - the lock mode to use for this operation, or null to use <a href="../../../com/sleepycat/db/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a>.</dd> <dt><span class="strong">Returns:</span></dt><dd>the value mapped to the given key, or null if the key is not present in the index.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="map()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>map</h4> <pre>public java.util.Map<<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>> map()</pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#map()">EntityIndex</a></code></strong></div> <div class="block">Returns a standard Java map based on this entity index. The <a href="../../../com/sleepycat/collections/StoredMap.html" title="class in com.sleepycat.collections"><code>StoredMap</code></a> returned is defined by the Collections API. Stored collections conform to the standard Java collections framework interface.</div> <dl><dt><span class="strong">Returns:</span></dt><dd>the map.</dd></dl> </li> </ul> <a name="sortedMap()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>sortedMap</h4> <pre>public java.util.SortedMap<<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">SK</a>,<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="type parameter in SecondaryIndex">E</a>> sortedMap()</pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#sortedMap()">EntityIndex</a></code></strong></div> <div class="block">Returns a standard Java sorted map based on this entity index. The <a href="../../../com/sleepycat/collections/StoredSortedMap.html" title="class in com.sleepycat.collections"><code>StoredSortedMap</code></a> returned is defined by the Collections API. Stored collections conform to the standard Java collections framework interface.</div> <dl><dt><span class="strong">Returns:</span></dt><dd>the map.</dd></dl> </li> </ul> <a name="contains(java.lang.Object)"> <!-- --> </a><a name="contains(K)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>contains</h4> <pre>public boolean contains(K key) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#contains(K)">EntityIndex</a></code></strong></div> <div class="block">Checks for existence of a key in this index. <p>The operation will not be transaction protected, and <a href="../../../com/sleepycat/db/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a> is used implicitly.</p></div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#contains(K)">contains</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - the key to search for.</dd> <dt><span class="strong">Returns:</span></dt><dd>whether the key exists in the index.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="contains(com.sleepycat.db.Transaction,java.lang.Object,com.sleepycat.db.LockMode)"> <!-- --> </a><a name="contains(com.sleepycat.db.Transaction, K, com.sleepycat.db.LockMode)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>contains</h4> <pre>public boolean contains(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, K key, <a href="../../../com/sleepycat/db/LockMode.html" title="class in com.sleepycat.db">LockMode</a> lockMode) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#contains(com.sleepycat.db.Transaction, K, com.sleepycat.db.LockMode)">EntityIndex</a></code></strong></div> <div class="block">Checks for existence of a key in this index.</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#contains(com.sleepycat.db.Transaction, K, com.sleepycat.db.LockMode)">contains</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - the transaction used to protect this operation, or null if the operation should not be transaction protected.</dd><dd><code>key</code> - the key to search for.</dd><dd><code>lockMode</code> - the lock mode to use for this operation, or null to use <a href="../../../com/sleepycat/db/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a>.</dd> <dt><span class="strong">Returns:</span></dt><dd>whether the key exists in the index.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="count()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>count</h4> <pre>public long count() throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#count()">EntityIndex</a></code></strong></div> <div class="block">Returns a non-transactional count of the entities in this index. <p>This operation is faster than obtaining a count by scanning the index manually, and will not perturb the current contents of the cache. However, the count is not guaranteed to be accurate if there are concurrent updates.</p></div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#count()">count</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Returns:</span></dt><dd>the number of entities in this index.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="delete(java.lang.Object)"> <!-- --> </a><a name="delete(K)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>delete</h4> <pre>public boolean delete(K key) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#delete(K)">EntityIndex</a></code></strong></div> <div class="block">Deletes all entities with a given index key. <p>Auto-commit is used implicitly if the store is transactional.</p></div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#delete(K)">delete</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - the key to search for.</dd> <dt><span class="strong">Returns:</span></dt><dd>whether any entities were deleted.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="delete(com.sleepycat.db.Transaction,java.lang.Object)"> <!-- --> </a><a name="delete(com.sleepycat.db.Transaction, K)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>delete</h4> <pre>public boolean delete(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, K key) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#delete(com.sleepycat.db.Transaction, K)">EntityIndex</a></code></strong></div> <div class="block">Deletes all entities with a given index key.</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#delete(com.sleepycat.db.Transaction, K)">delete</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - the transaction used to protect this operation, null to use auto-commit, or null if the store is non-transactional.</dd><dd><code>key</code> - the key to search for.</dd> <dt><span class="strong">Returns:</span></dt><dd>whether any entities were deleted.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="keys()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>keys</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><K> keys() throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#keys()">EntityIndex</a></code></strong></div> <div class="block">Opens a cursor for traversing all keys in this index. <p>The operations performed with the cursor will not be transaction protected, and <a href="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a> is used implicitly. If the store is transactional, the cursor may not be used to update or delete entities.</p></div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#keys()">keys</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="keys(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>keys</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><K> keys(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, <a href="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</a> config) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#keys(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)">EntityIndex</a></code></strong></div> <div class="block">Opens a cursor for traversing all keys in this index.</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#keys(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)">keys</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - the transaction used to protect all operations performed with the cursor, or null if the operations should not be transaction protected. If null is specified and the store is transactional, the cursor may not be used to update or delete entities.</dd><dd><code>config</code> - the cursor configuration that determines the default lock mode used for all cursor operations, or null to implicitly use <a href="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a>.</dd> <dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="entities()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>entities</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><E> entities() throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#entities()">EntityIndex</a></code></strong></div> <div class="block">Opens a cursor for traversing all entities in this index. <p>The operations performed with the cursor will not be transaction protected, and <a href="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a> is used implicitly. If the store is transactional, the cursor may not be used to update or delete entities.</p></div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#entities()">entities</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="entities(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>entities</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><E> entities(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, <a href="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</a> config) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#entities(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)">EntityIndex</a></code></strong></div> <div class="block">Opens a cursor for traversing all entities in this index.</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#entities(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)">entities</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - the transaction used to protect all operations performed with the cursor, or null if the operations should not be transaction protected. If null is specified and the store is transactional, the cursor may not be used to update or delete entities.</dd><dd><code>config</code> - the cursor configuration that determines the default lock mode used for all cursor operations, or null to implicitly use <a href="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a>.</dd> <dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="keys(java.lang.Object,boolean,java.lang.Object,boolean)"> <!-- --> </a><a name="keys(K, boolean, K, boolean)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>keys</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><K> keys(K fromKey, boolean fromInclusive, K toKey, boolean toInclusive) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#keys(K, boolean, K, boolean)">EntityIndex</a></code></strong></div> <div class="block">Opens a cursor for traversing keys in a key range. <p>The operations performed with the cursor will not be transaction protected, and <a href="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a> is used implicitly. If the store is transactional, the cursor may not be used to update or delete entities.</p></div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#keys(K, boolean, K, boolean)">keys</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>fromKey</code> - is the lower bound of the key range, or null if the range has no lower bound.</dd><dd><code>fromInclusive</code> - is true if keys greater than or equal to fromKey should be included in the key range, or false if only keys greater than fromKey should be included.</dd><dd><code>toKey</code> - is the upper bound of the key range, or null if the range has no upper bound.</dd><dd><code>toInclusive</code> - is true if keys less than or equal to toKey should be included in the key range, or false if only keys less than toKey should be included.</dd> <dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="keys(com.sleepycat.db.Transaction,java.lang.Object,boolean,java.lang.Object,boolean,com.sleepycat.db.CursorConfig)"> <!-- --> </a><a name="keys(com.sleepycat.db.Transaction, K, boolean, K, boolean, com.sleepycat.db.CursorConfig)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>keys</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><K> keys(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, K fromKey, boolean fromInclusive, K toKey, boolean toInclusive, <a href="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</a> config) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#keys(com.sleepycat.db.Transaction, K, boolean, K, boolean, com.sleepycat.db.CursorConfig)">EntityIndex</a></code></strong></div> <div class="block">Opens a cursor for traversing keys in a key range.</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#keys(com.sleepycat.db.Transaction, K, boolean, K, boolean, com.sleepycat.db.CursorConfig)">keys</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - the transaction used to protect all operations performed with the cursor, or null if the operations should not be transaction protected. If null is specified and the store is transactional, the cursor may not be used to update or delete entities.</dd><dd><code>fromKey</code> - is the lower bound of the key range, or null if the range has no lower bound.</dd><dd><code>fromInclusive</code> - is true if keys greater than or equal to fromKey should be included in the key range, or false if only keys greater than fromKey should be included.</dd><dd><code>toKey</code> - is the upper bound of the key range, or null if the range has no upper bound.</dd><dd><code>toInclusive</code> - is true if keys less than or equal to toKey should be included in the key range, or false if only keys less than toKey should be included.</dd><dd><code>config</code> - the cursor configuration that determines the default lock mode used for all cursor operations, or null to implicitly use <a href="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a>.</dd> <dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="entities(java.lang.Object,boolean,java.lang.Object,boolean)"> <!-- --> </a><a name="entities(K, boolean, K, boolean)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>entities</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><E> entities(K fromKey, boolean fromInclusive, K toKey, boolean toInclusive) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#entities(K, boolean, K, boolean)">EntityIndex</a></code></strong></div> <div class="block">Opens a cursor for traversing entities in a key range. <p>The operations performed with the cursor will not be transaction protected, and <a href="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a> is used implicitly. If the store is transactional, the cursor may not be used to update or delete entities.</p></div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#entities(K, boolean, K, boolean)">entities</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>fromKey</code> - is the lower bound of the key range, or null if the range has no lower bound.</dd><dd><code>fromInclusive</code> - is true if keys greater than or equal to fromKey should be included in the key range, or false if only keys greater than fromKey should be included.</dd><dd><code>toKey</code> - is the upper bound of the key range, or null if the range has no upper bound.</dd><dd><code>toInclusive</code> - is true if keys less than or equal to toKey should be included in the key range, or false if only keys less than toKey should be included.</dd> <dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> <a name="entities(com.sleepycat.db.Transaction,java.lang.Object,boolean,java.lang.Object,boolean,com.sleepycat.db.CursorConfig)"> <!-- --> </a><a name="entities(com.sleepycat.db.Transaction, K, boolean, K, boolean, com.sleepycat.db.CursorConfig)"> <!-- --> </a> <ul class="blockListLast"> <li class="blockList"> <h4>entities</h4> <pre>public <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><E> entities(<a href="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn, K fromKey, boolean fromInclusive, K toKey, boolean toInclusive, <a href="../../../com/sleepycat/db/CursorConfig.html" title="class in com.sleepycat.db">CursorConfig</a> config) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../com/sleepycat/persist/EntityIndex.html#entities(com.sleepycat.db.Transaction, K, boolean, K, boolean, com.sleepycat.db.CursorConfig)">EntityIndex</a></code></strong></div> <div class="block">Opens a cursor for traversing entities in a key range.</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../com/sleepycat/persist/EntityIndex.html#entities(com.sleepycat.db.Transaction, K, boolean, K, boolean, com.sleepycat.db.CursorConfig)">entities</a></code> in interface <code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist">EntityIndex</a><K,E></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>txn</code> - the transaction used to protect all operations performed with the cursor, or null if the operations should not be transaction protected. If null is specified and the store is transactional, the cursor may not be used to update or delete entities.</dd><dd><code>fromKey</code> - is the lower bound of the key range, or null if the range has no lower bound.</dd><dd><code>fromInclusive</code> - is true if keys greater than or equal to fromKey should be included in the key range, or false if only keys greater than fromKey should be included.</dd><dd><code>toKey</code> - is the upper bound of the key range, or null if the range has no upper bound.</dd><dd><code>toInclusive</code> - is true if keys less than or equal to toKey should be included in the key range, or false if only keys less than toKey should be included.</dd><dd><code>config</code> - the cursor configuration that determines the default lock mode used for all cursor operations, or null to implicitly use <a href="../../../com/sleepycat/db/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a>.</dd> <dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code></dd></dl> </li> </ul> </li> </ul> </li> </ul> </div> </div> <!-- ========= END OF CLASS DATA ========= --> <!-- ======= START OF BOTTOM NAVBAR ====== --> <div class="bottomNav"><a name="navbar_bottom"> <!-- --> </a><a href="#skip-navbar_bottom" title="Skip navigation links"></a><a name="navbar_bottom_firstrow"> <!-- --> </a> <ul class="navList" title="Navigation"> <li><a href="../../../overview-summary.html">Overview</a></li> <li><a href="package-summary.html">Package</a></li> <li class="navBarCell1Rev">Class</li> <li><a href="package-tree.html">Tree</a></li> <li><a href="../../../deprecated-list.html">Deprecated</a></li> <li><a href="../../../index-all.html">Index</a></li> <li><a href="../../../help-doc.html">Help</a></li> </ul> </div> <div class="subNav"> <ul class="navList"> <li><a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><span class="strong">Prev Class</span></a></li> <li><a href="../../../com/sleepycat/persist/StoreConfig.html" title="class in com.sleepycat.persist"><span class="strong">Next Class</span></a></li> </ul> <ul class="navList"> <li><a href="../../../index.html?com/sleepycat/persist/SecondaryIndex.html" target="_top">Frames</a></li> <li><a href="SecondaryIndex.html" target="_top">No Frames</a></li> </ul> <ul class="navList" id="allclasses_navbar_bottom"> <li><a href="../../../allclasses-noframe.html">All Classes</a></li> </ul> <div> <script type="text/javascript"><!-- allClassesLink = document.getElementById("allclasses_navbar_bottom"); if(window==top) { allClassesLink.style.display = "block"; } else { allClassesLink.style.display = "none"; } //--> </script> </div> <div> <ul class="subNavList"> <li>Summary: </li> <li>Nested | </li> <li>Field | </li> <li><a href="#constructor_summary">Constr</a> | </li> <li><a href="#method_summary">Method</a></li> </ul> <ul class="subNavList"> <li>Detail: </li> <li>Field | </li> <li><a href="#constructor_detail">Constr</a> | </li> <li><a href="#method_detail">Method</a></li> </ul> </div> <a name="skip-navbar_bottom"> <!-- --> </a></div> <!-- ======== END OF BOTTOM NAVBAR ======= --> </body> </html>