Informix extensions to SQLInput and SQLOutput

Some of the standard SQLInput and SQLOutput Stream methods need an additional length argument to read or write an opaque data type because the HCL Informix® JDBC Driver cannot determine the field lengths for an opaque type. Informix database server provides the IfmxUDTSQLInput and IfmxUDTSQLOutput extensions, which inherit from the standard Informix JDBC Driver 2.0 SQLInput and SQLOutput interfaces.