update trigger

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09-17-2010

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update trigger

hi all,

i hope i am posting this /beginner) question in the right forum:
i want to create an update trigger, which rolls back a transaction if a record of a table is updated. the table has - amongst others - a field 'statusid' - if a record in this table has the statusid X and it is attempted to update this field to Y, the trigger should rollback the transaction.

thanks for every hint or advise in advance!
k

---------- Post updated at 09:03 AM ---------- Previous update was at 08:23 AM ----------

I was able to help myself

kalinkula

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LEARN ABOUT CENTOS

rollback_prepared

ROLLBACK 
PREPARED(7)					  PostgreSQL 9.2.7 Documentation				      ROLLBACK PREPARED(7)

NAME

       ROLLBACK_PREPARED - cancel a transaction that was earlier prepared for two-phase commit

SYNOPSIS

       ROLLBACK PREPARED transaction_id

DESCRIPTION

       ROLLBACK PREPARED rolls back a transaction that is in prepared state.

PARAMETERS

       transaction_id
	   The transaction identifier of the transaction that is to be rolled back.

NOTES

       To roll back a prepared transaction, you must be either the same user that executed the transaction originally, or a superuser. But you do
       not have to be in the same session that executed the transaction.

       This command cannot be executed inside a transaction block. The prepared transaction is rolled back immediately.

       All currently available prepared transactions are listed in the pg_prepared_xacts system view.

EXAMPLES

       Roll back the transaction identified by the transaction identifier foobar:

	   ROLLBACK PREPARED 'foobar';

COMPATIBILITY

       ROLLBACK PREPARED is a PostgreSQL extension. It is intended for use by external transaction management systems, some of which are covered
       by standards (such as X/Open XA), but the SQL side of those systems is not standardized.

SEE ALSO

       PREPARE TRANSACTION (PREPARE_TRANSACTION(7)), COMMIT PREPARED (COMMIT_PREPARED(7))

PostgreSQL 9.2.7						    2014-02-17						      ROLLBACK PREPARED(7)

UNIX and Linux Applications