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SecondaryMultiKeyCreator (Oracle - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 5.3.28</font></EM>
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com.sleepycat.db</FONT>
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Interface SecondaryMultiKeyCreator</H2>
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<DL>
<DT><PRE>public interface <B>SecondaryMultiKeyCreator</B></DL>
</PRE>
<P>
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, java.lang.String, java.lang.String, com.sleepycat.db.Database, com.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.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../com/sleepycat/db/SecondaryConfig.html" title="class in com.sleepycat.db"><CODE>SecondaryConfig</CODE></A></DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/SecondaryMultiKeyCreator.html#createSecondaryKeys(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, java.util.Set)">createSecondaryKeys</A></B>(<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="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A> results)</CODE>
<BR>
Creates a secondary key entry, given a primary key and data entry.</TD>
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<A NAME="createSecondaryKeys(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, java.util.Set)"><!-- --></A><H3>
createSecondaryKeys</H3>
<PRE>
void <B>createSecondaryKeys</B>(<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="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A> results)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>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>
<P>
<DD><DL>
<DT><B>Parameters:</B><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><CODE>key</CODE> - the primary key entry. This parameter must not be modified
by this method.
<p><DD><CODE>data</CODE> - the primary data entry. This parameter must not be modified
by this method.
<p><DD><CODE>results</CODE> - the set to contain the the secondary key DatabaseEntry
objects created by this method.
<p>
<DT><B>Throws:</B>
<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.</DL>
</DD>
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