| Firebird Documentation Index → Firebird 2.1 Language Ref. Update → Context variables → OLD |
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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.
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| Firebird Documentation Index → Firebird 2.1 Language Ref. Update → Context variables → OLD |