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Posted by / 09-Sep-2019 18:29

Oracle trigger where clause updating

Note how the values assigned to the view are made available as field in the special "NEW" table within the trigger body.

If a BEFORE UPDATE or BEFORE DELETE trigger modifies or deletes a row that was to have been updated or deleted, then the result of the subsequent update or delete operation is undefined.

An ON CONFLICT clause may be specified as part of an UPDATE or INSERT action within the body of the trigger.

However if an ON CONFLICT clause is specified as part of the statement causing the trigger to fire, then conflict handling policy of the outer statement is used instead.

A trigger normally exists in the same database as the table named after the "ON" keyword in the CREATE TRIGGER statement.

At this time SQLite supports only FOR EACH ROW triggers, not FOR EACH STATEMENT triggers.Both the WHEN clause and the trigger actions may access elements of the row being inserted, deleted or updated using references of the form "NEW.column-name" and "OLD.column-name", where column-name is the name of a column from the table that the trigger is associated with.OLD and NEW references may only be used in triggers on events for which they are relevant, as follows: If a WHEN clause is supplied, the SQL statements specified are only executed if the WHEN clause is true.An error code of SQLITE_CONSTRAINT is returned to the application, along with the specified error message.When RAISE(IGNORE) is called, the remainder of the current trigger program, the statement that caused the trigger program to execute and any subsequent trigger programs that would have been executed are abandoned. If the statement that caused the trigger program to execute is itself part of a trigger program, then that trigger program resumes execution at the beginning of the next step.

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It facilitates you to change the trigger definition without using a DROP TRIGGER statement.