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SQL Anywhere 11.0.0 » SQL Anywhere Server - Programming » Introduction to Programming with SQL Anywhere » Using SQL in applications » Controlling transactions in applications

 

Cursors and transactions

In general, a cursor closes when a COMMIT is performed. There are two exceptions to this behavior:

  • The close_on_endtrans database option is set to Off.
  • A cursor is opened WITH HOLD, which is the default with Open Client and JDBC.

If either of these two cases is true, the cursor remains open on a COMMIT.

ROLLBACK and cursors

If a transaction rolls back, then cursors close except for those cursors opened WITH HOLD. However, don't rely on the contents of any cursor after a rollback.

The draft ISO SQL3 standard states that on a rollback, all cursors (even those cursors opened WITH HOLD) should close. You can obtain this behavior by setting the ansi_close_cursors_on_rollback option to On.

Savepoints

If a transaction rolls back to a savepoint, and if the ansi_close_cursors_on_rollback option is On, then all cursors (even those cursors opened WITH HOLD) opened after the SAVEPOINT close.

Cursors and isolation levels

You can change the isolation level of a connection during a transaction using the SET OPTION statement to alter the isolation_level option. However, this change does not affect open cursors.