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<h2 title="Interface ForeignMultiKeyNullifier" class="title">Interface ForeignMultiKeyNullifier</h2>
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<pre>public interface <span class="strong">ForeignMultiKeyNullifier</span></pre>
<div class="block">The interface implemented for setting multi-valued foreign keys to null.
<p>A key nullifier is used with a secondary database that is configured to
have a foreign key integrity constraint and a delete action of <a href="../../../com/sleepycat/db/ForeignKeyDeleteAction.html#NULLIFY"><code>ForeignKeyDeleteAction.NULLIFY</code></a>. The key nullifier is specified by calling
<a href="../../../com/sleepycat/db/SecondaryConfig.html#setForeignMultiKeyNullifier(com.sleepycat.db.ForeignMultiKeyNullifier)"><code>SecondaryConfig.setForeignMultiKeyNullifier(com.sleepycat.db.ForeignMultiKeyNullifier)</code></a>.</p>
<p>When a referenced record in the foreign key database is deleted and the
foreign key delete action is <code>NULLIFY</code>, the <a href="../../../com/sleepycat/db/ForeignMultiKeyNullifier.html#nullifyForeignKey(com.sleepycat.db.SecondaryDatabase,%20com.sleepycat.db.DatabaseEntry,%20com.sleepycat.db.DatabaseEntry,%20com.sleepycat.db.DatabaseEntry)"><code>nullifyForeignKey(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)</code></a> method is called. This method
sets the foreign key reference to null in the datum of the primary
database. The primary database is then updated to contain the modified
datum. The result is that the secondary key is deleted.</p>
This interface may be used along with <a href="../../../com/sleepycat/db/SecondaryKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryKeyCreator</code></a> or <a href="../../../com/sleepycat/db/SecondaryMultiKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryMultiKeyCreator</code></a> for many-to-many, one-to-many, many-to-one and
one-to-one relationships.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/ForeignMultiKeyNullifier.html#nullifyForeignKey(com.sleepycat.db.SecondaryDatabase,%20com.sleepycat.db.DatabaseEntry,%20com.sleepycat.db.DatabaseEntry,%20com.sleepycat.db.DatabaseEntry)">nullifyForeignKey</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,
<a href="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> secKey)</code>
<div class="block">Sets the foreign key reference to null in the datum of the primary
database.</div>
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<h3>Method Detail</h3>
<a name="nullifyForeignKey(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)">
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<h4>nullifyForeignKey</h4>
<pre>boolean nullifyForeignKey(<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,
<a href="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> secKey)
throws <a href="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre>
<div class="block">Sets the foreign key reference to null in the datum of the primary
database.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>secondary</code> - the database in which the foreign key integrity
constraint is defined. This parameter is passed for informational
purposes but is not commonly used.</dd><dd><code>key</code> - the existing primary key. This parameter is passed for
informational purposes but is not commonly used.</dd><dd><code>data</code> - the existing primary datum in which the foreign key
reference should be set to null. This parameter should be updated by
this method if it returns true.</dd><dd><code>secKey</code> - the secondary key to be nullified. This parameter is
needed for knowing which key to nullify when multiple keys are present,
as when <a href="../../../com/sleepycat/db/SecondaryMultiKeyCreator.html" title="interface in com.sleepycat.db"><code>SecondaryMultiKeyCreator</code></a> is used.</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the datum was modified, or false to indicate that the
key is not present.</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 clear the key
reference.</dd></dl>
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