MySQL 如何创建带有IN参数的MySQL存储过程？

为了让读者更好的理解，我们使用名为“student_info”的表来进行示例，它具有以下值-

mysql> Select * from student_info;
+-----+---------+------------+------------+
| id  | Name    | Address    | Subject    |
+-----+---------+------------+------------+
| 101 | YashPal | Amritsar   | History    |
| 105 | Gaurav  | Jaipur     | Literature |
| 110 | Rahul   | Chandigarh | History    |
| 125 | Raman   | Shimla     | Computers  |
+------+--------+------------+------------+
4 rows in set (0.00 sec)

现在，使用以下查询，我们将创建一个带有IN参数的存储过程，该过程将通过将名称作为参数提供来显示特定学生的所有详细信息。

mysql> DELIMITER // ;
mysql> Create PROCEDURE detail(IN S_Name VARCHAR(20))
    -> BEGIN
    -> SELECT * From Student_info WHERE Name = S_Name;
    -> END //
Query OK, 0 rows affected (0.16 sec)
mysql> DELIMITER ;

S_Name是存储过程’detail’的IN参数。如果我们想要查看学生名称为”Gaurav”的所有详细信息，则可以使用以下查询-

mysql> CALL detail('Gaurav');
+-----+--------+---------+------------+
| id  | Name   | Address | Subject    |
+-----+--------+---------+------------+
| 105 | Gaurav | Jaipur  | Literature |
+-----+--------+---------+------------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.01 sec)
mysql> CALL detail('Raman');
+-----+-------+---------+-----------+
| id  | Name  | Address | Subject   |
+-----+-------+---------+-----------+
| 125 | Raman | Shimla  | Computers |
+-----+-------+---------+-----------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.01 sec)

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