PostgreSQL

--------------存储过程

CREATE OR REPLACE FUNCTION publisherCursor() RETURNS void AS
$$
DECLARE
-- 定义游标.
cur_publisher CURSOR FOR
select p.publisher_id as publisher_id,g.id as g_id from t_publisher p join t_publisher_group g on g.publisher_id=p.group_id where group_property=1;
-- 定义存储数据的变量.
v_publisher_id t_publisher.publisher_id%TYPE;
v_g_id t_publisher.group_id%TYPE;
BEGIN
-- 打开游标.
OPEN cur_publisher;
-- 填充数据.
FETCH cur_publisher INTO v_publisher_id,v_g_id;


-- 假如检索到了数据，才处理.
while found loop
update t_publisher set group_id=v_g_id where publisher_id=v_publisher_id;
-- 填充下一条数据.
FETCH cur_publisher INTO v_publisher_id,v_g_id;
end loop;

-- 关闭游标
CLOSE cur_publisher;
END;
$$ LANGUAGE plpgsql;

------------------------------------增加字段

alter table t_province add province_name_en_us varchar(500); COMMENT ON COLUMN "t_province"."province_name_en_us" IS '省份英文名称';