<!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_75) on Fri May 13 13:32:18 PDT 2016 --> <title>EntityJoin (Oracle - Berkeley DB Java API)</title> <meta name="date" content="2016-05-13"> <link rel="stylesheet" type="text/css" href="../../../style.css" title="Style"> </head> <body> <script type="text/javascript"><!-- if (location.href.indexOf('is-external=true') == -1) { parent.document.title="EntityJoin (Oracle - Berkeley DB Java API)"; } //--> </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="class-use/EntityJoin.html">Use</a></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 class="aboutLanguage"><em><b>Berkeley DB</b><br><font size="-1"> version 6.1.29</font></em></div> </div> <div class="subNav"> <ul class="navList"> <li><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist"><span class="strong">Prev Class</span></a></li> <li><a href="../../../com/sleepycat/persist/EntityStore.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/EntityJoin.html" target="_top">Frames</a></li> <li><a href="EntityJoin.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 EntityJoin" class="title">Class EntityJoin<PK,E></h2> </div> <div class="contentContainer"> <ul class="inheritance"> <li>java.lang.Object</li> <li> <ul class="inheritance"> <li>com.sleepycat.persist.EntityJoin<PK,E></li> </ul> </li> </ul> <div class="description"> <ul class="blockList"> <li class="blockList"> <hr> <br> <pre>public class <span class="strong">EntityJoin<PK,E></span> extends java.lang.Object</pre> <div class="block">Performs an equality join on two or more secondary keys. <p><code>EntityJoin</code> objects are thread-safe. Multiple threads may safely call the methods of a shared <code>EntityJoin</code> object.</p> <p>An equality join is a match on all entities in a given primary index that have two or more specific secondary key values. Note that key ranges may not be matched by an equality join, only exact keys are matched.</p> <p>For example:</p> <pre class="code"> // Index declarations -- see <a href="package-summary.html#example">package summary example</a>. // PrimaryIndex<String, Person> personBySsn; SecondaryIndex<String, String, Person> personByParentSsn; SecondaryIndex<Long, String, Person> personByEmployerIds; Employer employer = ...; // Match on all Person objects having parentSsn "111-11-1111" and also // containing an employerId of employer.id. In other words, match on all // of Bob's children that work for a given employer. // EntityJoin<String, Person> join = new EntityJoin(personBySsn); join.addCondition(personByParentSsn, "111-11-1111"); join.addCondition(personByEmployerIds, employer.id); // Perform the join operation by traversing the results with a cursor. // ForwardCursor<Person> results = join.entities(); try { for (Person person : results) { System.out.println(person.ssn + ' ' + person.name); } } finally { results.close(); }</pre></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/EntityJoin.html#EntityJoin(com.sleepycat.persist.PrimaryIndex)">EntityJoin</a></strong>(<a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</a>,<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</a>> index)</code> <div class="block">Creates a join object for a given primary index.</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><SK> void</code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/EntityJoin.html#addCondition(com.sleepycat.persist.SecondaryIndex,%20SK)">addCondition</a></strong>(<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="class in com.sleepycat.persist">SecondaryIndex</a><SK,<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</a>,<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</a>> index, SK key)</code> <div class="block">Adds a secondary key condition to the equality join.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/EntityJoin.html#entities()">entities</a></strong>()</code> <div class="block">Opens a cursor that returns the entities qualifying for the join.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/EntityJoin.html#entities(com.sleepycat.db.Transaction,%20com.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 that returns the entities qualifying for the join.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/EntityJoin.html#keys()">keys</a></strong>()</code> <div class="block">Opens a cursor that returns the primary keys of entities qualifying for the join.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</a>></code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/persist/EntityJoin.html#keys(com.sleepycat.db.Transaction,%20com.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 that returns the primary keys of entities qualifying for the join.</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="EntityJoin(com.sleepycat.persist.PrimaryIndex)"> <!-- --> </a> <ul class="blockListLast"> <li class="blockList"> <h4>EntityJoin</h4> <pre>public EntityJoin(<a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</a>,<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</a>> index)</pre> <div class="block">Creates a join object for a given primary index.</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - the primary index on which the join will operate.</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="addCondition(com.sleepycat.persist.SecondaryIndex,java.lang.Object)"> <!-- --> </a><a name="addCondition(com.sleepycat.persist.SecondaryIndex, SK)"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>addCondition</h4> <pre>public <SK> void addCondition(<a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="class in com.sleepycat.persist">SecondaryIndex</a><SK,<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</a>,<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</a>> index, SK key)</pre> <div class="block">Adds a secondary key condition to the equality join. Only entities having the given key value in the given secondary index will be returned by the join operation.</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - the secondary index containing the given key value.</dd><dd><code>key</code> - the key value to match during the join.</dd></dl> </li> </ul> <a name="entities()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>entities</h4> <pre>public <a href="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</a>> entities() throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block">Opens a cursor that returns the entities qualifying for the join. The join operation is performed as the returned cursor is accessed. <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.</p></div> <dl><dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code>java.lang.IllegalStateException</code> - if less than two conditions were added.</dd> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - the base class for all BDB exceptions.</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/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">E</a>> 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">Opens a cursor that returns the entities qualifying for the join. The join operation is performed as the returned cursor is accessed.</div> <dl><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 the store is non-transactional, null must be specified. For a transactional store the transaction is optional for read-only access and required for read-write access.</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>java.lang.IllegalStateException</code> - if less than two conditions were added.</dd> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - the base class for all BDB exceptions.</dd></dl> </li> </ul> <a name="keys()"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>keys</h4> <pre>public <a href="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</a>> keys() throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block">Opens a cursor that returns the primary keys of entities qualifying for the join. The join operation is performed as the returned cursor is accessed. <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.</p></div> <dl><dt><span class="strong">Returns:</span></dt><dd>the cursor.</dd> <dt><span class="strong">Throws:</span></dt> <dd><code>java.lang.IllegalStateException</code> - if less than two conditions were added.</dd> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - the base class for all BDB exceptions.</dd></dl> </li> </ul> <a name="keys(com.sleepycat.db.Transaction, com.sleepycat.db.CursorConfig)"> <!-- --> </a> <ul class="blockListLast"> <li class="blockList"> <h4>keys</h4> <pre>public <a href="../../../com/sleepycat/persist/ForwardCursor.html" title="interface in com.sleepycat.persist">ForwardCursor</a><<a href="../../../com/sleepycat/persist/EntityJoin.html" title="type parameter in EntityJoin">PK</a>> 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">Opens a cursor that returns the primary keys of entities qualifying for the join. The join operation is performed as the returned cursor is accessed.</div> <dl><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 the store is non-transactional, null must be specified. For a transactional store the transaction is optional for read-only access and required for read-write access.</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>java.lang.IllegalStateException</code> - if less than two conditions were added.</dd> <dd><code><a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - the base class for all BDB exceptions.</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="class-use/EntityJoin.html">Use</a></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 class="aboutLanguage"><em><b>Berkeley DB</b><br><font size="-1"> version 6.1.29</font></em></div> </div> <div class="subNav"> <ul class="navList"> <li><a href="../../../com/sleepycat/persist/EntityIndex.html" title="interface in com.sleepycat.persist"><span class="strong">Prev Class</span></a></li> <li><a href="../../../com/sleepycat/persist/EntityStore.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/EntityJoin.html" target="_top">Frames</a></li> <li><a href="EntityJoin.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 ======= --> <p class="legalCopy"><small><font size=1>Copyright (c) 1996, 2016 Oracle and/or its affiliates. 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