PostgreSQL do $$ DECLARE 操作

PostgreSQL支持无需创建出来即可执行的function，关键字是

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

示例如下：

do$$
DECLAREd_news_id numeric;d_tag_id numeric;cur_list CURSOR FORselect flu.id,fcm.id
FROMa fcm,b frr,c flur,d flu
WHEREfcm.create_id = frr.relation_id
AND flur.ID = frr.role_id
AND flu.id = flur.login_user_id
AND fcm.create_id IS NOT NULL
AND flur.role_type = 1
AND flur.status = 1
AND frr. TYPE = 1;
BEGINOPEN cur_list;LOOPFETCH cur_list INTO d_news_id,d_tag_id;EXIT WHEN NOT FOUND;--插入数据UPDATE a SET login_user_id = d_news_id where id = d_tag_id;END LOOP;CLOSE cur_list;
END;
$$

PostgreSQL do $$ DECLARE 操作

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