检查当前 FOREIGN_KEY_CHECKS 值答案

【问题标题】：Check current FOREIGN_KEY_CHECKS value检查当前 FOREIGN_KEY_CHECKS 值
【发布时间】：2017-06-26 15:30:14
【问题描述】：

如何查看 FOREIGN_KEY_CHECKS 的当前值是多少？

我想确定该值为 1。

【问题讨论】：

标签： mysql

【解决方案1】：

查看5.1.5 Server System Variables::foreign_key_checks:

mysql> SELECT @@GLOBAL.foreign_key_checks, @@SESSION.foreign_key_checks;
+-----------------------------+------------------------------+
| @@GLOBAL.foreign_key_checks | @@SESSION.foreign_key_checks |
+-----------------------------+------------------------------+
|                           1 |                            1 |
+-----------------------------+------------------------------+
1 row in set (0.01 sec)

更新

mysql> SELECT VERSION();
+-----------+
| VERSION() |
+-----------+
| 5.7.18    |
+-----------+
1 row in set (0.00 sec)

mysql> SELECT IF((SELECT `VARIABLE_VALUE`
    -> FROM `performance_schema`.`global_variables`
    -> WHERE `VARIABLE_NAME` = 'foreign_key_checks') = 'ON', 1, 0) `global.foreign_key_checks`,
    -> IF((SELECT `VARIABLE_VALUE`
    -> FROM `performance_schema`.`session_variables`
    -> WHERE `VARIABLE_NAME` = 'foreign_key_checks') = 'ON', 1, 0) `session.foreign_key_checks`;
+---------------------------+----------------------------+
| global.foreign_key_checks | session.foreign_key_checks |
+---------------------------+----------------------------+
|                         1 |                          1 |
+---------------------------+----------------------------+
1 row in set (0.00 sec)

【讨论】：