<!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 13:32:17 PDT 2016 --> <title>SecondaryMultiKeyCreator (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="SecondaryMultiKeyCreator (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/SecondaryMultiKeyCreator.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/db/SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><span class="strong">Prev Class</span></a></li> <li><a href="../../../com/sleepycat/db/Sequence.html" title="class in com.sleepycat.db"><span class="strong">Next Class</span></a></li> </ul> <ul class="navList"> <li><a href="../../../index.html?com/sleepycat/db/SecondaryMultiKeyCreator.html" target="_top">Frames</a></li> <li><a href="SecondaryMultiKeyCreator.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>Constr | </li> <li><a href="#method_summary">Method</a></li> </ul> <ul class="subNavList"> <li>Detail: </li> <li>Field | </li> <li>Constr | </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.db</div> <h2 title="Interface SecondaryMultiKeyCreator" class="title">Interface SecondaryMultiKeyCreator</h2> </div> <div class="contentContainer"> <div class="description"> <ul class="blockList"> <li class="blockList"> <hr> <br> <pre>public interface <span class="strong">SecondaryMultiKeyCreator</span></pre> <div class="block">The interface implemented for extracting multi-valued secondary keys from primary records. <p> The key creator object is specified by calling <a href="../../../com/sleepycat/db/SecondaryConfig.html#setMultiKeyCreator(com.sleepycat.db.SecondaryMultiKeyCreator)"><code>SecondaryConfig.setMultiKeyCreator</code></a>. The secondary database configuration is specified when calling <a href="../../../com/sleepycat/db/Environment.html#openSecondaryDatabase(com.sleepycat.db.Transaction,%20java.lang.String,%20java.lang.String,%20com.sleepycat.db.Database,%20com.sleepycat.db.SecondaryConfig)"><code>Environment.openSecondaryDatabase</code></a>. <p> For example: <pre> class MyMultiKeyCreator implements SecondaryMultiKeyCreator { public void createSecondaryKeys(SecondaryDatabase secondary, DatabaseEntry key, DatabaseEntry data, Set results) throws DatabaseException { // // DO HERE: Extract the secondary keys from the primary key and // data. For each key extracted, create a DatabaseEntry and add it // to the results set. // } } ... SecondaryConfig secConfig = new SecondaryConfig(); secConfig.setMultiKeyCreator(new MyMultiKeyCreator()); // Now pass secConfig to Environment.openSecondaryDatabase </pre> <p> Use this interface when any number of secondary keys may be present in a single primary record, in other words, for many-to-many and one-to-many relationships. When only zero or one secondary key is present (for many-to-one and one-to-one relationships) you may use the <a href="../../../com/sleepycat/db/SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a> interface instead. The table below summarizes how to create all four variations of relationships. <div> <table border="yes"> <tr><th>Relationship</th> <th>Interface</th> <th>Duplicates</th> <th>Example</th> </tr> <tr><td>One-to-one</td> <td><a href="../../../com/sleepycat/db/SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a></td> <td>No</td> <td>A person record with a unique social security number key.</td> </tr> <tr><td>Many-to-one</td> <td><a href="../../../com/sleepycat/db/SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a></td> <td>Yes</td> <td>A person record with a non-unique employer key.</td> </tr> <tr><td>One-to-many</td> <td><a href="../../../com/sleepycat/db/SecondaryMultiKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryMultiKeyCreator</code></a></td> <td>No</td> <td>A person record with multiple unique email address keys.</td> </tr> <tr><td>Many-to-many</td> <td><a href="../../../com/sleepycat/db/SecondaryMultiKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryMultiKeyCreator</code></a></td> <td>Yes</td> <td>A person record with multiple non-unique organization keys.</td> </tr> </table> </div> <p>To configure a database for duplicates. pass true to <a href="../../../com/sleepycat/db/DatabaseConfig.html#setSortedDuplicates(boolean)"><code>DatabaseConfig.setSortedDuplicates(boolean)</code></a>.</p> <p> Note that <code>SecondaryMultiKeyCreator</code> may also be used for single key secondaries (many-to-one and one-to-one); in this case, at most a single key is added to the results set. <code>SecondaryMultiKeyCreator</code> is only slightly less efficient than <a href="../../../com/sleepycat/db/SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a> in that two or three temporary sets must be created to hold the results.</div> <dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/sleepycat/db/SecondaryConfig.html" title="class in com.sleepycat.db"><code>SecondaryConfig</code></a></dd></dl> </li> </ul> </div> <div class="summary"> <ul class="blockList"> <li class="blockList"> <!-- ========== 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>void</code></td> <td class="colLast"><code><strong><a href="../../../com/sleepycat/db/SecondaryMultiKeyCreator.html#createSecondaryKeys(com.sleepycat.db.SecondaryDatabase,%20com.sleepycat.db.DatabaseEntry,%20com.sleepycat.db.DatabaseEntry,%20java.util.Set)">createSecondaryKeys</a></strong>(<a href="../../../com/sleepycat/db/SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</a> secondary, <a href="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> key, <a href="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> data, java.util.Set results)</code> <div class="block">Creates a secondary key entry, given a primary key and data entry.</div> </td> </tr> </table> </li> </ul> </li> </ul> </div> <div class="details"> <ul class="blockList"> <li class="blockList"> <!-- ============ METHOD DETAIL ========== --> <ul class="blockList"> <li class="blockList"><a name="method_detail"> <!-- --> </a> <h3>Method Detail</h3> <a name="createSecondaryKeys(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, java.util.Set)"> <!-- --> </a> <ul class="blockListLast"> <li class="blockList"> <h4>createSecondaryKeys</h4> <pre>void createSecondaryKeys(<a href="../../../com/sleepycat/db/SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</a> secondary, <a href="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> key, <a href="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> data, java.util.Set results) throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre> <div class="block">Creates a secondary key entry, given a primary key and data entry. <p> A secondary key may be derived from the primary key, primary data, or a combination of the primary key and data. Zero or more secondary keys may be derived from the primary record and returned in the results parameter. To ensure the integrity of a secondary database the key creator method must always return the same results for a given set of input parameters. <p></div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>secondary</code> - the database to which the secondary key will be added. This parameter is passed for informational purposes but is not commonly used. <p></dd><dd><code>key</code> - the primary key entry. This parameter must not be modified by this method. <p></dd><dd><code>data</code> - the primary data entry. This parameter must not be modified by this method. <p></dd><dd><code>results</code> - the set to contain the the secondary key DatabaseEntry objects created by this method. <p></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> - if an error occurs attempting to create the secondary key.</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/SecondaryMultiKeyCreator.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/db/SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><span class="strong">Prev Class</span></a></li> <li><a href="../../../com/sleepycat/db/Sequence.html" title="class in com.sleepycat.db"><span class="strong">Next Class</span></a></li> </ul> <ul class="navList"> <li><a href="../../../index.html?com/sleepycat/db/SecondaryMultiKeyCreator.html" target="_top">Frames</a></li> <li><a href="SecondaryMultiKeyCreator.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>Constr | </li> <li><a href="#method_summary">Method</a></li> </ul> <ul class="subNavList"> <li>Detail: </li> <li>Field | </li> <li>Constr | </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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