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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 ForeignKeyNullifier" class="title">Interface ForeignKeyNullifier</h2>
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<dt>All Known Implementing Classes:</dt>
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<dd><code><a href="../bind/serial/SerialSerialKeyCreator.html" title="class in com.sleepycat.bind.serial">SerialSerialKeyCreator</a></code>, <code><a href="../bind/serial/TupleSerialKeyCreator.html" title="class in com.sleepycat.bind.serial">TupleSerialKeyCreator</a></code>, <code><a href="../bind/serial/TupleSerialMarshalledKeyCreator.html" title="class in com.sleepycat.bind.serial">TupleSerialMarshalledKeyCreator</a></code>, <code><a href="../bind/tuple/TupleTupleKeyCreator.html" title="class in com.sleepycat.bind.tuple">TupleTupleKeyCreator</a></code>, <code><a href="../bind/tuple/TupleTupleMarshalledKeyCreator.html" title="class in com.sleepycat.bind.tuple">TupleTupleMarshalledKeyCreator</a></code></dd>
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<pre>public interface <span class="typeNameLabel">ForeignKeyNullifier</span></pre>
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<div class="block">The interface implemented for setting single-valued foreign keys to null.
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<p>A key nullifier is used with a secondary database that is configured to
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have a foreign key integrity constraint and a delete action of <a href="ForeignKeyDeleteAction.html#NULLIFY"><code>ForeignKeyDeleteAction.NULLIFY</code></a>. The key nullifier is specified by calling
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<a href="SecondaryConfig.html#setForeignKeyNullifier-com.sleepycat.db.ForeignKeyNullifier-"><code>SecondaryConfig.setForeignKeyNullifier(com.sleepycat.db.ForeignKeyNullifier)</code></a>.</p>
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<p>When a referenced record in the foreign key database is deleted and the
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foreign key delete action is <code>NULLIFY</code>, the <a href="#nullifyForeignKey-com.sleepycat.db.SecondaryDatabase-com.sleepycat.db.DatabaseEntry-"><code>nullifyForeignKey(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry)</code></a> method is called. This method sets
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the foreign key reference to null in the datum of the primary database. The
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primary database is then updated to contain the modified datum. The result
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is that the secondary key is deleted.</p>
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This interface may be used along with <a href="SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a> for
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many-to-one and one-to-one relationships. It may <em>not</em> be used with
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<a href="SecondaryMultiKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryMultiKeyCreator</code></a> because the secondary key is not passed as
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a parameter to the nullifyForeignKey method and this method would not know
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which key to nullify. When using <a href="SecondaryMultiKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryMultiKeyCreator</code></a>, use
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<a href="ForeignMultiKeyNullifier.html" title="interface in com.sleepycat.db"><code>ForeignMultiKeyNullifier</code></a> instead.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>boolean</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#nullifyForeignKey-com.sleepycat.db.SecondaryDatabase-com.sleepycat.db.DatabaseEntry-">nullifyForeignKey</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> data)</code></th>
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<td class="colLast">
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<div class="block">Sets the foreign key reference to null in the datum of the primary
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database.</div>
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<a name="nullifyForeignKey-com.sleepycat.db.SecondaryDatabase-com.sleepycat.db.DatabaseEntry-">
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<h4>nullifyForeignKey</h4>
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<pre class="methodSignature">boolean nullifyForeignKey​(<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> data)
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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">Sets the foreign key reference to null in the datum of the primary
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database.</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 in which the foreign key integrity
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constraint is defined. This parameter is passed for informational
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purposes but is not commonly used.</dd>
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<dd><code>data</code> - the existing primary datum in which the foreign key
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reference should be set to null. This parameter should be updated by
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this method if it returns true.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>true if the datum was modified, or false to indicate that the
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key is not present.</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 clear the key
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reference.</dd>
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