PostgreSQL do $$ DECLARE 操作

PostgreSQL支持無需創建出來即可執行的function，關鍵字是

do language plpgsql $$
declare
begin
...
..
.
end $$;

示例如下：

do
  $$
DECLARE
    d_news_id numeric;
  d_tag_id numeric;
    cur_list CURSOR FOR
 select flu.id,fcm.id
FROM
   a fcm,
    b frr,
    c flur,
    d flu
WHERE
    fcm.create_id = frr.relation_id
AND flur.ID = frr.role_id
AND flu.id = flur.login_user_id
AND fcm.create_id IS NOT NULL
AND flur.role_type = 1
AND flur.status = 1
AND frr. TYPE = 1;
BEGIN
    OPEN cur_list;
    LOOP
        FETCH cur_list INTO d_news_id,d_tag_id;
        EXIT WHEN NOT FOUND;
        --插入數據
    UPDATE a SET login_user_id = d_news_id where id = d_tag_id;
    END LOOP;
    CLOSE cur_list;
END;
$$