DT
><A
NAME="LIBPQ-PQSETINSTANCEDATA"
></A
><CODE
CLASS="FUNCTION"
>PQsetInstanceData</CODE
>
      </DT
><DD
><P
>       Sets the connection <TT
CLASS="PARAMETER"
>conn</TT
>'s <TT
CLASS="LITERAL"
>instanceData</TT
>
       for procedure <TT
CLASS="PARAMETER"
>proc</TT
> to <TT
CLASS="PARAMETER"
>data</TT
>.  This
       returns non-zero for success and zero for failure.  (Failure is
       only possible if <TT
CLASS="PARAMETER"
>proc</TT
> has not been properly
       registered in <TT
CLASS="PARAMETER"
>