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DbDupCompare
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com.sleepycat.db</FONT>
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Interface DbDupCompare</H2>
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<DT><PRE>public interface <B>DbDupCompare</B></DL>
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<P>
An interface specifying a comparison function, which imposes a
total ordering on the duplicate data items in a Btree database.
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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" title="class in com.sleepycat.db">Db</A> db,
<A HREF="../../../com/sleepycat/db/Dbt.html" title="class in com.sleepycat.db">Dbt</A> dbt1,
<A HREF="../../../com/sleepycat/db/Dbt.html" title="class in com.sleepycat.db">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>
<PRE>
int <B>compareDuplicates</B>(<A HREF="../../../com/sleepycat/db/Db.html" title="class in com.sleepycat.db">Db</A> db,
<A HREF="../../../com/sleepycat/db/Dbt.html" title="class in com.sleepycat.db">Dbt</A> dbt1,
<A HREF="../../../com/sleepycat/db/Dbt.html" title="class in com.sleepycat.db">Dbt</A> dbt2)</PRE>
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<DD>The DbDupCompare interface is used by the
Db.setDuplicatelicateCompare method.</p> </p>
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<DD><DL>
<DT><B>Parameters:</B><DD><CODE>db</CODE> - the enclosing database handle.<DD><CODE>dbt1</CODE> - a <A HREF="../../../com/sleepycat/db/Dbt.html" title="class in com.sleepycat.db"><CODE>Dbt</CODE></A> representing
the application supplied data item.<DD><CODE>dbt2</CODE> - a <A HREF="../../../com/sleepycat/db/Dbt.html" title="class in com.sleepycat.db"><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" title="class in com.sleepycat.db"><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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