Scrollable cursors

Informix®

Informix SQL and Genero BDL support scrollable cursors when you specify the SCROLL clause in the DECLARE cursor instruction:

DECLARE c1 SCROLL CURSOR FOR SELECT ...

Important: Informix does not allow to fetch TEXT/BYTE columns with scrollable cursors. If you declare a scroll cursor with a SELECT containing TEXT/BYTE columns, Informix will produce the SQL error -611 when executing the OPEN instruction.

IBM® DB2®

IBM DB2 supports native scrollable cursors with the CLI SQL_CURSOR_STATIC statement attribute.

Solution

The IBM DB2 database driver uses the native scrollable cursors by setting the CLI statement attribute SQL_ATTR_CURSOR_TYPE to SQL_CURSOR_STATIC.

Important: With IBM DB2 is it NOT possible to use LOB columns in a scrollable cursor. If TEXT/BYTE columns are used with a scrollable cursor, the OPEN instruction will produce the SQL error -611 (as with Informix).