rface <CODE><A HREF="../tokyocabinet/DBM.html" title="interface in tokyocabinet">DBM</A></CODE></DL>
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<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key.<DD><CODE>num</CODE> - the additional value.
<DT><B>Returns:</B><DD>If successful, it is the summation value, else, it is `Integer.MIN_VALUE'.<DT><B>Note:</B></DT>
  <DD>If the corresponding record exists, the value is treated as an integer and is added to.
 If no record corresponds, a new record of the additional value is stored.</DD>
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