如何获取存储过程结果以用于另一个存储过程或查询语句

Question

我正在尝试创建一个存储过程，其中过程内部是一个查询语句，其结果将用作另一个查询的参数

CREATE DEFINER=`root`@`localhost` PROCEDURE `getRecActive`(
IN  adminid VARCHAR(25))
BEGIN
   select record_id from records2 where record_div = @adminid
   //i want to use record_id result to the next query
   select * from records where record = "record_id";
END

Answer 1

select * from records 
where record in
(
  select record_id from records2 where record_div = @adminid
)

Answer 2

如果您必须将其作为一个过程执行，那么您需要将 select 转换为局部变量并在第二个查询中使用它。 给定

+----+----------+----------+
| id | username | photo    |
+----+----------+----------+
|  1 | aaa      | john.png |
|  2 | Jane     | jane.png |
|  3 | Ali      |          |
+----+----------+----------+
3 rows in set (0.00 sec)

drop procedure if exists p;
delimiter $$

CREATE PROCEDURE p(
IN  adminid VARCHAR(25))
BEGIN
    declare vid int;
   select id into vid from users where username = adminid;

   select id,username,photo from users where id = vid;
END $$

delimiter ;

call p('aaa')

+----+----------+----------+
| id | username | photo    |
+----+----------+----------+
|  1 | aaa      | john.png |
+----+----------+----------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.02 sec)

请注意，您不能将结果集填充到变量中，如果这是您从第一个查询中得到的结果，那么您尝试做的事情根本不起作用。