rule with multiple DELETE action part
От | Papp Gyozo |
---|---|
Тема | rule with multiple DELETE action part |
Дата | |
Msg-id | Pine.GSO.4.21.0009181154170.22017-100000@ural2 обсуждение исходный текст |
Ответы |
rule with multiple DELETE action part
|
Список | pgsql-general |
Hello, now, my only question is how I can make a rule on a view with multiple delete action part which works well. I need a mechanism which deletes two rows from two tables which are in a one-to-one join. The example listed below is a quite different from the real tables I use. The table in the same role as "t_two" references the other table ("t_one"). If rules with multiple action don't work correctly this would mean that my only last chance is using the REFERENCES constraint with ON DELETE CASCADE option? I hope not, because it is not for the same, I want to deny to delete rows if it has a pair in the other table. By the way, multiple inserts seem to work. try=# CREATE TABLE t_one (c_i integer PRIMARY KEY, c_t text); CREATE try=# CREATE TABLE t_two (c_i integer REFERENCES t_one, c_d date); CREATE try=# CREATE VIEW v_one_two AS SELECT t_one.oid as c_oid, t_one.c_i, c_d, c_t try-# FROM t_one, t_two WHERE t_one.c_i = t_two.c_i; CREATE 81186 1 try=# CREATE RULE r_one_two_del AS ON DELETE TO v_one_two try-# DO INSTEAD (DELETE FROM t_two WHERE c_i = old.c_i; DELETE FROM t_one WHERE c_i = old.c_i;); CREATE 81187 1 try=# SELECT * FROM v_one_two; c_oid | c_i | c_d | c_t -------+-----+------------+------- 81157 | 1 | 2000-09-01 | hello 81158 | 2 | 1999-12-31 | world 81159 | 3 | 2000-08-12 | brave (3 rows) try=# DELETE FROM v_one_two WHERE c_i = 2; DELETE 0 try=# SELECT * FROM t_one; c_i | c_t -----+------- 1 | hello 2 | world 3 | brave 4 | guy (4 rows) try=# SELECT * FROM t_two; c_i | c_d -----+------------ 1 | 2000-09-01 3 | 2000-08-12 (2 rows) Papp Gyozo s7461pap@hszk.bme.hu, gerzson17@freemail.hu
В списке pgsql-general по дате отправления: