On Thu, 2024-09-12 at 10:27 +0200, Duncan Sands wrote:
> CREATE TABLE test_table(x int);
> CREATE FUNCTION test_function() RETURNS trigger AS $$ BEGIN RETURN NULL; END; $$
> LANGUAGE plpgsql;
> CREATE TRIGGER test_trigger AFTER UPDATE ON test_table FOR EACH ROW EXECUTE
> FUNCTION test_function();
> ALTER TABLE test_table ENABLE ALWAYS TRIGGER test_trigger;
>
> Checking the table:
>
> duncan=> \d test_table
> Table "public.test_table"
> Column | Type | Collation | Nullable | Default
> --------+---------+-----------+----------+---------
> x | integer | | |
> Triggers firing always:
> test_trigger AFTER UPDATE ON test_table FOR EACH ROW EXECUTE FUNCTION
> test_function()
>
> ^ Observe "Triggers firing always".
>
>
> Now for the dump + restore:
>
> pg_dump -f dump.custom -Fc --table test_table
> pg_restore --data-only --disable-triggers --dbname duncan dump.custom
>
> Checking the table:
>
> duncan=> \d test_table
> Table "public.test_table"
> Column | Type | Collation | Nullable | Default
> --------+---------+-----------+----------+---------
> x | integer | | |
> Triggers:
> test_trigger AFTER UPDATE ON test_table FOR EACH ROW EXECUTE FUNCTION
> test_function()
>
> ^ Observe that "Triggers firing always" has disappeared.
This looks like a user error to me.
If you restore with --data-only, the table and constraint definitions
are not restored at all. So the table "test_table" in database "duncan"
must already have existed before the restore, and the trigger was already
defined like that.
Yours,
Laurenz Albe
