An invalid SQLLEN(<num>) was found for a integer column in the
  SQLDA

  Explanation:  You passed in an integer column in a SQLDA with a
  SQLLEN that was invalid.  For SQLTYPE of INTEGER, SQLLEN must be
  4.  For SQLTYPE of SMALLINT, SQLLEN must be 2.

  User Action:  Set the SQLLEN to 2 for SMALLINT, or 4 for
  INTEGER.