Описание

DROP FOREIGN DATA WRAPPER удаляет существующую обёртку сторонних данных. Пользователь, выполняющий эту команду, должен быть владельцем обёртки.

Параметры

Примеры

Удаление обёртки сторонних данных dbi:

DROP FOREIGN DATA WRAPPER dbi;

Совместимость

DROP FOREIGN DATA WRAPPER соответствует стандарту ISO/IEC 9075-9 (SQL/MED). Предложение IF EXISTS является расширением Postgres Pro.

См. также

Description

RELEASE SAVEPOINT destroys a savepoint previously defined in the current transaction.

Destroying a savepoint makes it unavailable as a rollback point, but it has no other user visible behavior. It does not undo the effects of commands executed after the savepoint was established. (To do that, see ROLLBACK TO SAVEPOINT.) Destroying a savepoint when it is no longer needed allows the system to reclaim some resources earlier than transaction end.

RELEASE SAVEPOINT also destroys all savepoints that were established after the named savepoint was established.

Parameters

Notes

Specifying a savepoint name that was not previously defined is an error.

It is not possible to release a savepoint when the transaction is in an aborted state.

If multiple savepoints have the same name, only the most recently defined unreleased one is released. Repeated commands will release progressively older savepoints.

Examples

To establish and later destroy a savepoint:

BEGIN;
    INSERT INTO table1 VALUES (3);
    SAVEPOINT my_savepoint;
    INSERT INTO table1 VALUES (4);
    RELEASE SAVEPOINT my_savepoint;
COMMIT;

The above transaction will insert both 3 and 4.

Compatibility

This command conforms to the SQL standard. The standard specifies that the key word SAVEPOINT is mandatory, but Postgres Pro allows it to be omitted.

See Also