MySQL 如何创建一个MySQL存储过程，返回MySQL表的多个值？

我们可以创建一个同时带有 IN 和 OUT 参数的存储过程来从MySQL表中获取多个值，以一个名为“student_info”的表为例，该表的数据如下：

mysql> Select * from student_info;
+------+---------+------------+------------+
| id   | Name    | Address    | Subject    |
+------+---------+------------+------------+
| 101  | YashPal | Amritsar   | History    |
| 105  | Gaurav  | Jaipur     | Literature |
| 110  | Rahul   | Chandigarh | History    |
| 125  | Raman   | Bangalore  | Computers  |
+------+---------+------------+------------+
4 rows in set (0.01 sec)

现在，我们创建名为“select_studentinfo”的存储过程，提供“id”值即可从“student_info”表中选择值，如下所示：

mysql> DELIMITER // ;
mysql> Create Procedure Select_studentinfo ( IN p_id INT, OUT p_name varchar(20),OUT p_address varchar(20), OUT p_subject varchar(20))
    -> BEGIN
    -> SELECT name, address, subject INTO p_name, p_address, p_subject
    -> FROM student_info
    -> WHERE id = p_id;
    -> END //
Query OK, 0 rows affected (0.03 sec)

在上面的查询中，除了1个IN参数，还有4个OUT参数。现在，我们调用存储过程，提供相应的值作为条件，如下所示：

mysql> DELIMITER ; //
mysql> CALL Select_studentinfo(110, @p_name, @p_address, @p_subject);
Query OK, 1 row affected (0.06 sec)

mysql> Select @p_name AS Name,@p_Address AS Address, @p_subject AS Subject;
+--------+------------+-----------+
| Name   | Address    | Subject   |
+--------+------------+-----------+
| Rahul  | Chandigarh | History   |
+--------+------------+-----------+
1 row in set (0.00 sec)

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