the DB handle must be a longword

  Explanation:  Database handles that are passed to  RDB$INTERPRET
  must be longwords passed by descriptor.

  User Action:  Define the  database  handle  to  be  a  longword.
  Examples:  For COBOL:  01 DBHANDLE PIC S9(9) COMP.  For FORTRAN:
  INTEGER*4 DBHANDLE.  For BASIC:        LONG DBHANDLE.