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Yasuhiro KIMURA
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<div class="aboutLanguage"><b>Berkeley DB</b><br><font size="-1"> version 18.1.40</font></div>
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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.sleepycat.db</a></div>
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<h2 title="Interface SecondaryMultiKeyCreator" class="title">Interface SecondaryMultiKeyCreator</h2>
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<pre>public interface <span class="typeNameLabel">SecondaryMultiKeyCreator</span></pre>
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<div class="block">The interface implemented for extracting multi-valued secondary keys from
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primary records.
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<p>
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The key creator object is specified by calling
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<a href="SecondaryConfig.html#setMultiKeyCreator-com.sleepycat.db.SecondaryMultiKeyCreator-"><code>SecondaryConfig.setMultiKeyCreator</code></a>.
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The secondary database configuration is specified when calling
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<a href="Environment.html#openSecondaryDatabase-com.sleepycat.db.Transaction-java.lang.String-java.lang.String-com.sleepycat.db.Database-com.sleepycat.db.SecondaryConfig-"><code>Environment.openSecondaryDatabase</code></a>.
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<p>
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For example:
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<pre>
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class MyMultiKeyCreator implements SecondaryMultiKeyCreator {
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public void createSecondaryKeys(SecondaryDatabase secondary,
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DatabaseEntry key,
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DatabaseEntry data,
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Set results)
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throws DatabaseException {
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//
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// DO HERE: Extract the secondary keys from the primary key and
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// data. For each key extracted, create a DatabaseEntry and add it
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// to the results set.
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//
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}
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}
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...
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SecondaryConfig secConfig = new SecondaryConfig();
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secConfig.setMultiKeyCreator(new MyMultiKeyCreator());
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// Now pass secConfig to Environment.openSecondaryDatabase
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</pre>
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<p>
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Use this interface when any number of secondary keys may be present in a single
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primary record, in other words, for many-to-many and one-to-many relationships.
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When only zero or one secondary key is present (for many-to-one and one-to-one
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relationships) you may use the <a href="SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a> interface instead.
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The table below summarizes how to create all four variations of relationships.
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<div>
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<table border="yes">
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<caption>Summary of four variations of relationships</caption>
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<tr><th>Relationship</th>
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<th>Interface</th>
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<th>Duplicates</th>
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<th>Example</th>
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</tr>
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<tr><td>One-to-one</td>
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<td><a href="SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a></td>
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<td>No</td>
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<td>A person record with a unique social security number key.</td>
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</tr>
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<tr><td>Many-to-one</td>
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<td><a href="SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a></td>
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<td>Yes</td>
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<td>A person record with a non-unique employer key.</td>
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</tr>
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<tr><td>One-to-many</td>
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<td><a href="SecondaryMultiKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryMultiKeyCreator</code></a></td>
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<td>No</td>
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<td>A person record with multiple unique email address keys.</td>
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</tr>
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<tr><td>Many-to-many</td>
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<td><a href="SecondaryMultiKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryMultiKeyCreator</code></a></td>
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<td>Yes</td>
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<td>A person record with multiple non-unique organization keys.</td>
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</tr>
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</table>
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</div>
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<p>To configure a database for duplicates. pass true to <a href="DatabaseConfig.html#setSortedDuplicates-boolean-"><code>DatabaseConfig.setSortedDuplicates(boolean)</code></a>.</p>
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<p>
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Note that <code>SecondaryMultiKeyCreator</code> may also be used for single key
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secondaries (many-to-one and one-to-one); in this case, at most a single key is
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added to the results set. <code>SecondaryMultiKeyCreator</code> is only
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slightly less efficient than <a href="SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a> in that two or three
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temporary sets must be created to hold the results.</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="SecondaryConfig.html" title="class in com.sleepycat.db"><code>SecondaryConfig</code></a></dd>
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</dl>
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<h3>Method Summary</h3>
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<table class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colSecond" scope="col">Method</th>
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<th class="colLast" scope="col">Description</th>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#createSecondaryKeys-com.sleepycat.db.SecondaryDatabase-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.DatabaseEntry-java.util.Set-">createSecondaryKeys</a></span>​(<a href="SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</a> secondary,
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<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> key,
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<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> data,
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java.util.Set results)</code></th>
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<td class="colLast">
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<div class="block">Creates a secondary key entry, given a primary key and data entry.</div>
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</td>
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</tr>
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<h3>Method Detail</h3>
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<a name="createSecondaryKeys-com.sleepycat.db.SecondaryDatabase-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.DatabaseEntry-java.util.Set-">
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<h4>createSecondaryKeys</h4>
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<pre class="methodSignature">void createSecondaryKeys​(<a href="SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</a> secondary,
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<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> key,
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<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> data,
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java.util.Set results)
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throws <a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre>
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<div class="block">Creates a secondary key entry, given a primary key and data entry.
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<p>
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A secondary key may be derived from the primary key, primary data, or a
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combination of the primary key and data. Zero or more secondary keys may
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be derived from the primary record and returned in the results parameter.
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To ensure the integrity of a secondary database the key creator method must
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always return the same results for a given set of input parameters.
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<p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>secondary</code> - the database to which the secondary key will be added.
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This parameter is passed for informational purposes but is not commonly
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used.
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<p></dd>
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<dd><code>key</code> - the primary key entry. This parameter must not be modified
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by this method.
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<p></dd>
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<dd><code>data</code> - the primary data entry. This parameter must not be modified
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by this method.
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<p></dd>
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<dd><code>results</code> - the set to contain the the secondary key DatabaseEntry
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objects created by this method.
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<p></dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - if an error occurs attempting to create the
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secondary key.</dd>
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