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DbDupCompare (Sleepycat Software, Inc. - Berkeley DB Java API)
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Interface DbDupCompare</H2>
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<DT>public interface <B>DbDupCompare</B></DL>
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An interface specifying a comparison function, which imposes a total ordering on the duplicate data items in a Btree database.</p>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/DbDupCompare.html#compareDuplicates(com.sleepycat.db.Db, com.sleepycat.db.Dbt, com.sleepycat.db.Dbt)">compareDuplicates</A></B>(<A HREF="../../../com/sleepycat/db/Db.html">Db</A> db,
<A HREF="../../../com/sleepycat/db/Dbt.html">Dbt</A> dbt1,
<A HREF="../../../com/sleepycat/db/Dbt.html">Dbt</A> dbt2)</CODE>
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The DbDupCompare interface is used by the Db.setDuplicatelicateCompare method.</TD>
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<A NAME="compareDuplicates(com.sleepycat.db.Db, com.sleepycat.db.Dbt, com.sleepycat.db.Dbt)"><!-- --></A><H3>
compareDuplicates</H3>
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public int <B>compareDuplicates</B>(<A HREF="../../../com/sleepycat/db/Db.html">Db</A> db,
<A HREF="../../../com/sleepycat/db/Dbt.html">Dbt</A> dbt1,
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<DD>The DbDupCompare interface is used by the Db.setDuplicatelicateCompare method.</p> </p>
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<DT><B>Parameters:</B><DD><CODE>db</CODE> - the enclosing database handle.<DD><CODE>dbt1</CODE> - a <A HREF="../../../com/sleepycat/db/Dbt.html"><CODE>Dbt</CODE></A> representing the application supplied data item.<DD><CODE>dbt2</CODE> - a <A HREF="../../../com/sleepycat/db/Dbt.html"><CODE>Dbt</CODE></A> representing the current tree's data item.
<DT><B>Returns:</B><DD>The <b>dup_compare_fcn</b> function must return an integer value less than, equal to, or greater than zero if the first data item parameter is considered to be respectively less than, equal to, or greater than the second data item parameter. In addition, the comparison function must cause the data items in the set to be <i>well-ordered</i>. The comparison function must correctly handle any data item values used by the application (possibly including zero-length data items). The <b>data</b> and <b>size</b> fields of the <A HREF="../../../com/sleepycat/db/Dbt.html"><CODE>Dbt</CODE></A> are the only fields that may be used for the purposes of this comparison, and no particular alignment of the memory to which the <b>data</b> field refers may be assumed.</p></DL>
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