PG DML returning

• 构造数据

drop table if exists test cascade;
create table test(id int, name varchar);
insert into test values(1,'a'),(2,'b');
select * from test;

• 实例1

CREATE OR REPLACE FUNCTION func_test() 
RETURNS INTEGER AS
$BODY$
DECLARE
  v_name varchar;
BEGIN
  select name from test where id=1 into v_name ;
  raise notice 'v_name=%',v_name;
      return 0;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

• 实例2

CREATE OR REPLACE FUNCTION func_test2() 
RETURNS INTEGER AS
$BODY$
DECLARE
  v_name varchar;
BEGIN
  insert into test values(3,'c') returning name into v_name;
  raise notice 'v_name=%',v_name;
  return 0;
END;
$BODY$
LANGUAGE 'plpgsql'  VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

• 结果

imos=# select * from func_test();
imos=# NOTICE:  v_name=a
 func_test
-----------
         0
(1 row)

imos=# select * from func_test2();
NOTICE:  v_name=c
 func_test2
------------
          0