如何将存储在记录类型变量中的查询结果用于同一存储函数中的另一个查询?我使用Postgres 9.4.4.
有这样一张桌子:
create table test (id int, tags text[]);
insert into test values (1,'{a,b,c}'),
(2,'{c,d,e}');
我编写了一个函数(简化),如下所示:
CREATE OR REPLACE FUNCTION func(_tbl regclass)
RETURNS TABLE (t TEXT[], e TEXT[])
LANGUAGE plpgsql AS $$
DECLARE
t RECORD;
c INT;
BEGIN
EXECUTE format('SELECT id, tags FROM %s', _tbl) INTO t;
SELECT count(*) FROM t INTO c;
RAISE NOTICE '% results', c;
SELECT * FROM t;
END
$$;
... 但没有奏效:
select func('test');
ERROR: 42P01: relation "t" does not exist LINE 1: SELECT count(*) FROM t ^ QUERY: SELECT count(*) FROM t CONTEXT: PL/pgSQL function func(regclass) line 7 at SQL statement LOCATION: parserOpenTable, parse_relation.c:986