| Firebird Documentation Index → Firebird 2.5 Language Ref. Update → Context variables → OLD |
|
|
|
Available in: PSQL, triggers only
Changed in: 1.5, 2.0
Description: OLD contains the existing version of a database record just before
a deletion or update. Starting with Firebird 2.0 it is read-only.
Type: Data row
In multi-action triggers – introduced in Firebird 1.5 – OLD is
always available. But if the trigger is fired by an INSERT, there is
obviously no pre-existing version of the record. In that situation, reading from
OLD will always return NULL; writing to it will
cause a runtime exception.
|
| Firebird Documentation Index → Firebird 2.5 Language Ref. Update → Context variables → OLD |