diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/trigger.sgml | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/doc/src/sgml/trigger.sgml b/doc/src/sgml/trigger.sgml index a8ee6c7d951..56dfec80e6c 100644 --- a/doc/src/sgml/trigger.sgml +++ b/doc/src/sgml/trigger.sgml @@ -1,5 +1,5 @@ <!-- -$PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.35 2004/03/03 22:22:24 neilc Exp $ +$PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.36 2004/08/13 16:17:19 tgl Exp $ --> <chapter id="triggers"> @@ -431,8 +431,10 @@ typedef struct Trigger </para> <para> - A trigger function must return either <symbol>NULL</> or a - <structname>HeapTuple</> pointer. Be careful to return either + A trigger function must return either a + <structname>HeapTuple</> pointer or a <symbol>NULL</> pointer + (<emphasis>not</> a SQL NULL, that is, do not set isNull true). + Be careful to return either <structfield>tg_trigtuple</> or <structfield>tg_newtuple</>, as appropriate, if you don't want to modify the row being operated on. </para> |