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更新特定视图中的任何值后，MySQL会在基表及其关联的视图（如果有）中更新相同的值吗？

2024-04-28 20:52:03 621

是的，如果在视图，基表及其关联视图中更新了该值，则MySQL将更新该值。为了说明这一点，我们以带有以下数据的Student_info表为例-

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

以下是在表“Student_info”的基础上创建的“信息”视图

mysql> Select * from Info;
+------+---------+------------+
| Id   | Name    | Subject    |
+------+---------+------------+
| 101  | YashPal | History    |
| 105  | Gaurav  | Literature |
| 125  | Raman   | Computers  |
| NULL | Ram     | Computers  |
+------+---------+------------+
4 rows in set (0.00 sec)

现在在以下查询中，我们将更新视图“Info”-

mysql> Update info set id = 130 where Name = 'Ram';

mysql> Select * from Info;
+------+---------+------------+
| Id   | Name    | Subject    |
+------+---------+------------+
| 101  | YashPal | History    |
| 105  | Gaurav  | Literature |
| 125  | Raman   | Computers  |
| 130  | Ram     | Computers  |
+------+---------+------------+
4 rows in set (0.00 sec)

上面的结果集显示，“Info”已更新。

mysql> Select * from student_info;
+------+---------+------------+------------+
| id   | Name    | Address    | Subject    |
+------+---------+------------+------------+
| 101  | YashPal | Amritsar   | History    |
| 105  | Gaurav  | Chandigarh | Literature |
| 125  | Raman   | Shimla     | Computers  |
| 130  | Ram     | Jhansi     | Computers  |
+------+---------+------------+------------+
4 rows in set (0.00 sec)

上面的结果集显示，当我们更新名为“info”的视图时，基表也得到了更新。

下面是在视图“info”的基础上创建的名为“info_less”的视图，并且当我们更新视图“info”时也进行了更新。

mysql> Select * from info_less;
+------+-------+-----------+
| Id   | Name  | Subject   |
+------+-------+-----------+
| 125  | Raman | Computers |
| 130  | Ram   | Computers |
+------+-------+-----------+
2 rows in set (0.00 sec)

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更新特定视图中的任何值后，MySQL会在基表及其关联的视图（如果有）中更新相同的值吗？

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