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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2010-10-10 13:43:33 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2010-10-10 13:45:07 -0400 |
| commit | 2ec993a7cbdd8e251817ac6bbc9a704ce8346f73 (patch) | |
| tree | 1568fb4b00b6fa7997755113a3d0bbfead45c1fb /src/backend/utils/adt/ruleutils.c | |
| parent | f7b15b5098ee89a2628129fbbef9901bded9d27b (diff) | |
| download | postgresql-2ec993a7cbdd8e251817ac6bbc9a704ce8346f73.tar.gz postgresql-2ec993a7cbdd8e251817ac6bbc9a704ce8346f73.zip | |
Support triggers on views.
This patch adds the SQL-standard concept of an INSTEAD OF trigger, which
is fired instead of performing a physical insert/update/delete. The
trigger function is passed the entire old and/or new rows of the view,
and must figure out what to do to the underlying tables to implement
the update. So this feature can be used to implement updatable views
using trigger programming style rather than rule hacking.
In passing, this patch corrects the names of some columns in the
information_schema.triggers view. It seems the SQL committee renamed
them somewhere between SQL:99 and SQL:2003.
Dean Rasheed, reviewed by Bernd Helmle; some additional hacking by me.
Diffstat (limited to 'src/backend/utils/adt/ruleutils.c')
| -rw-r--r-- | src/backend/utils/adt/ruleutils.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c index 578b9ce2b7b..f1c1d04ee09 100644 --- a/src/backend/utils/adt/ruleutils.c +++ b/src/backend/utils/adt/ruleutils.c @@ -545,8 +545,13 @@ pg_get_triggerdef_worker(Oid trigid, bool pretty) if (TRIGGER_FOR_BEFORE(trigrec->tgtype)) appendStringInfo(&buf, "BEFORE"); - else + else if (TRIGGER_FOR_AFTER(trigrec->tgtype)) appendStringInfo(&buf, "AFTER"); + else if (TRIGGER_FOR_INSTEAD(trigrec->tgtype)) + appendStringInfo(&buf, "INSTEAD OF"); + else + elog(ERROR, "unexpected tgtype value: %d", trigrec->tgtype); + if (TRIGGER_FOR_INSERT(trigrec->tgtype)) { appendStringInfo(&buf, " INSERT"); |