更新特定视图中的任何值后，MySQL 是否会更新基表及其关联视图（如果有）中的相同值？

Yes, MySQL will update the value, if it is updated in a view, in the base table as well as in its associated views. To illustrate it we are taking the example of table Student_info having the following data −

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)

以下是基于表格 ‘Student_info’ 创建的视图 ‘Info’

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)

现在在下面的查询中，我们将更新视图 ‘Info’ −

mysql> Update info set id = 130 where Name = 'Ram';
Query OK, 1 row affected (0.88 sec)

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)

上述结果集显示视图 ‘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，基本表也会被更新。

下面是基于视图'info'创建的名为'info_less'的视图，当我们更新视图'info'时，它也会被更新。

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

以上是更新特定视图中的任何值后，MySQL 是否会更新基表及其关联视图（如果有）中的相同值？的详细内容。更多信息请关注PHP中文网其他相关文章！