如何创建存储过程以从MySQL表中删除值?
我们可以使用IN运算符创建一个存储过程,以从MySQL表中删除值。为了理解它,我们以一个名为“ student_info”的表为例,该表包含以下数据:
mysql> Select * from student_info;+------+---------+------------+------------+
| id | Name | Address | Subject |
+------+---------+------------+------------+
| 100 | Aarav | Delhi | Computers |
| 101 | YashPal | Amritsar | History |
| 105 | Gaurav | Jaipur | Literature |
| 110 | Rahul | Chandigarh | History |
+------+---------+------------+------------+
4 rows in set (0.00 sec)
现在,通过如下创建名为“ delete_studentinfo”的过程,我们可以从“ student_info”表中删除值:
mysql> DELIMITER // ;mysql> Create Procedure Delete_studentinfo ( IN p_id INT)
-> BEGIN
-> DELETE FROM student_info
-> WHERE ID=p_id;
-> END //
mysql> DELIMITER ; //
现在,使用要从表中删除的值调用过程,如下所示:
mysql> CALL Delete_studentinfo(100);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)
上面的结果集显示从表中删除了id = 100的记录。
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