Tạo stored procedure trả về nhiều giá trị từ bảng MySQL

Dùng tham số IN và OUT để lấy nhiều giá trị. Bảng student_info:

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)

Tạo procedure Select_studentinfo với 1 IN, 3 OUT:

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)

Gọi procedure:

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)