如何从命令行设置 MySQL session wait_timeout？

Question

正如您从下面的输出中看到的，我正在使用 MySQL shell 将会话的 wait_timeout 变量更改为 30 秒。有效。

但是，有没有办法从命令行设置这个变量？

$ mysql -u root -h 127.0.0.1 -p
Enter password:
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Your MySQL connection id is 48543
Server version: 5.6.39 MySQL Community Server (GPL)

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mysql> SHOW SESSION VARIABLES LIKE 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout  | 28800 |
+---------------+-------+
1 row in set (0.00 sec)

mysql> SET session wait_timeout=30;
Query OK, 0 rows affected (0.00 sec)

mysql> SHOW SESSION VARIABLES LIKE 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout  | 30    |
+---------------+-------+
1 row in set (0.00 sec)

mysql> select now() from dual;
+---------------------+
| now()               |
+---------------------+
| 2018-01-23 17:16:52 |
+---------------------+
1 row in set (0.00 sec)

mysql> select now() from dual;
ERROR 2013 (HY000): Lost connection to MySQL server during query

Answer 1

这样做：

$ mysql -u root -p -h 127.0.0.1 --init-command="SET SESSION wait_timeout=30"

如何从命令行设置 MySQL session wait_timeout？

How to set MySQL session wait_timeout from the command line?

mysql

command-line-arguments