UPDATE/DELETE … WHERE CURRENT OF

Informix®

Informix allows positioned UPDATEs and DELETEs with the "WHERE CURRENT OF cursor" clause, if the cursor has been DECLARED with a SELECT ... FOR UPDATE statement.

SAP® ASE

UPDATE/DELETE ... WHERE CURRENT OF is supported with SAP ASE by using server side cursors.

Solution

With SAP ASE, UPDATE/DELETE ... WHERE CURRENT OF instructions are executed as is without any SQL translation: Since BDL cursors for the SELECT FOR UPDATE statements are implemented with ODBC server cursors, native positioned update/delete can take place in SQL SERVER.

As a replacement of WHERE CURRENT OF, if the database table is defined with a primary key column, use the value fetched from the SELECT [FOR UPDATE] cursor in the WHERE clause of the UPDATE/DELETE statement.