"WITH HOLD"
Cursors are usually closed automatically at the end of a transaction, i.e. when a COMMIT or ROLLBACK (or an implicit termination of the transaction) occurs. That behavior can be changed if the cursor is declared using the WITH HOLD clause. (The default is WITHOUT HOLD.) A holdable cursor is kept open over COMMIT and closed upon ROLLBACK. (Some DBMS deviate from this standard behavior and also keep holdable cursors open over ROLLBACK.)
DECLARE cursor_name CURSOR WITH HOLD FOR SELECT ... FROM ...When a COMMIT occurs, a holdable cursor is positioned before the next row. Thus, a positioned UPDATE or positioned DELETE statement will only succeed after a FETCH operation occurred first in the transaction.
Note that JDBC defines cursors as holdable per default. This is done because JDBC also activates auto-commit per default. Due to the usual overhead associated with auto-commit and holdable cursors, both features should be explicitly deactivated at the connection level.
Read more about this topic: Cursor (databases)
Famous quotes containing the word hold:
“Why do we like being Irish? Partly because
It gives us a hold on the sentimental English
As members of a world that never was,
Baptized with fairy water;”
—Louis MacNeice (1907–1963)
“Eyes I shall not see unless
At the door of death’s other kingdom
Where, as in this,
The eyes outlast a little while
A little while outlast the tears
And hold us in derision.”
—T.S. (Thomas Stearns)