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DbBtreeCompare (Sleepycat Software, Inc. - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 4.2.52</font></EM>
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Interface DbBtreeCompare</H2>
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<DT>public interface <B>DbBtreeCompare</B></DL>
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An interface specifying a comparison function, which imposes a total ordering on the keys in a Btree database.</p>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/DbBtreeCompare.html#compare(com.sleepycat.db.Db, com.sleepycat.db.Dbt, com.sleepycat.db.Dbt)">compare</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 DbBtreeCompare interface is used by the Db.setBtreeCompare method.</TD>
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<A NAME="compare(com.sleepycat.db.Db, com.sleepycat.db.Dbt, com.sleepycat.db.Dbt)"><!-- --></A><H3>
compare</H3>
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public int <B>compare</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)</PRE>
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<DD>The DbBtreeCompare interface is used by the Db.setBtreeCompare method.</p> </p>
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<DT><B>Parameters:</B><DD><CODE>db</CODE> - the enclosing database handle.<DD><CODE>dbt1</CODE> - the <A HREF="../../../com/sleepycat/db/Dbt.html"><CODE>Dbt</CODE></A> representing the application supplied key.<DD><CODE>dbt2</CODE> - the <A HREF="../../../com/sleepycat/db/Dbt.html"><CODE>Dbt</CODE></A> representing the current tree's key.
<DT><B>Returns:</B><DD>The <b>bt_compare_fcn</b> function must return an integer value less than, equal to, or greater than zero if the first key parameter is considered to be respectively less than, equal to, or greater than the second key parameter. In addition, the comparison function must cause the keys in the database to be <i>well-ordered</i>. The comparison function must correctly handle any key values used by the application (possibly including zero-length keys). In addition, when Btree key prefix comparison is being performed (see <A HREF="../../../com/sleepycat/db/Db.html#setBtreePrefix(com.sleepycat.db.DbBtreePrefix)"><CODE>Db.setBtreePrefix</CODE></A> for more information), the comparison routine may be passed a prefix of any database key. 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 by the <b>data</b> field refers may be assumed.</p></DL>
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