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DbBtreePrefix (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 DbBtreePrefix</H2>
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<DT>public interface <B>DbBtreePrefix</B></DL>
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An interface specifying a comparison function, which specifies the number of bytes needed to differentiate Btree keys.</p>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/DbBtreePrefix.html#prefix(com.sleepycat.db.Db, com.sleepycat.db.Dbt, com.sleepycat.db.Dbt)">prefix</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 DbBtreePrefix interface is used by the Db.setBtreePrefix method.</TD>
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<A NAME="prefix(com.sleepycat.db.Db, com.sleepycat.db.Dbt, com.sleepycat.db.Dbt)"><!-- --></A><H3>
prefix</H3>
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public int <B>prefix</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 DbBtreePrefix interface is used by the Db.setBtreePrefix 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 a database key.<DD><CODE>dbt2</CODE> - a <A HREF="../../../com/sleepycat/db/Dbt.html"><CODE>Dbt</CODE></A> representing a database key.
<DT><B>Returns:</B><DD>The <b>bt_prefix_fcn</b> function must return the number of bytes of the second key parameter that would be required by the Btree key comparison function to determine the second key parameter's ordering relationship with respect to the first key parameter. If the two keys are equal, the key length should be returned. The prefix function must correctly handle any key values used by the application (possibly including zero-length keys). 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 determination, and no particular alignment of the memory to which the <b>data</b> field refers may be assumed.</p></DL>
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