Mysql 5.5 设置数据库参数
可以通过SET命令来更改数据库的参数
--全局级别
mysql> show global variables like '%server%';
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| character_set_server | utf8 |
| collation_server | utf8_general_ci |
| server_id | 1 |
+----------------------+-----------------+
3 rows in set (0.00 sec)
mysql> set global character_set_server=gbk;
Query OK, 0 rows affected (0.10 sec)
mysql> show global variables like '%server%';
+----------------------+----------------+
| Variable_name | Value |
+----------------------+----------------+
| character_set_server | gbk |
| collation_server | gbk_chinese_ci |
| server_id | 1 |
+----------------------+----------------+
3 rows in set (0.01 sec)
也可以使用下面方式来修改
mysql> show global variables like 'character_set_server';
+----------------------+--------+
| Variable_name | Value |
+----------------------+--------+
| character_set_server | latin1 |
+----------------------+--------+
1 row in set (0.00 sec)
mysql> set @@global.character_set_server=gbk;
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like 'character_set_server';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| character_set_server | gbk |
+----------------------+-------+
1 row in set (0.01 sec)
--会话级别
mysql> set session character_set_server='utf8';
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like '%server%';
+----------------------+----------------+
| Variable_name | Value |
+----------------------+----------------+
| character_set_server | gbk |
| collation_server | gbk_chinese_ci |
| server_id | 1 |
+----------------------+----------------+
3 rows in set (0.00 sec)
--show variables查询的是会话级别的参数
mysql> show variables like '%server%';
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| character_set_server | utf8 |
| collation_server | utf8_general_ci |
| server_id | 1 |
+----------------------+-----------------+
3 rows in set (0.00 sec)
mysql> show session variables like '%server%';
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| character_set_server | utf8 |
| collation_server | utf8_general_ci |
| server_id | 1 |
+----------------------+-----------------+
3 rows in set (0.00 sec)
即使是使用set global命令设置的参数，在数据库重启后，相关的参数也会失效；如果想让参数永久生效，可以将参数写在配置文件里面。
[root@localhost mysql]# vim /etc/my.cnf
--全局级别
mysql> show global variables like '%server%';
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| character_set_server | utf8 |
| collation_server | utf8_general_ci |
| server_id | 1 |
+----------------------+-----------------+
3 rows in set (0.00 sec)
mysql> set global character_set_server=gbk;
Query OK, 0 rows affected (0.10 sec)
mysql> show global variables like '%server%';
+----------------------+----------------+
| Variable_name | Value |
+----------------------+----------------+
| character_set_server | gbk |
| collation_server | gbk_chinese_ci |
| server_id | 1 |
+----------------------+----------------+
3 rows in set (0.01 sec)
也可以使用下面方式来修改
mysql> show global variables like 'character_set_server';
+----------------------+--------+
| Variable_name | Value |
+----------------------+--------+
| character_set_server | latin1 |
+----------------------+--------+
1 row in set (0.00 sec)
mysql> set @@global.character_set_server=gbk;
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like 'character_set_server';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| character_set_server | gbk |
+----------------------+-------+
1 row in set (0.01 sec)
--会话级别
mysql> set session character_set_server='utf8';
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like '%server%';
+----------------------+----------------+
| Variable_name | Value |
+----------------------+----------------+
| character_set_server | gbk |
| collation_server | gbk_chinese_ci |
| server_id | 1 |
+----------------------+----------------+
3 rows in set (0.00 sec)
--show variables查询的是会话级别的参数
mysql> show variables like '%server%';
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| character_set_server | utf8 |
| collation_server | utf8_general_ci |
| server_id | 1 |
+----------------------+-----------------+
3 rows in set (0.00 sec)
mysql> show session variables like '%server%';
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| character_set_server | utf8 |
| collation_server | utf8_general_ci |
| server_id | 1 |
+----------------------+-----------------+
3 rows in set (0.00 sec)
[root@localhost mysql]# vim /etc/my.cnf
# Character set
character_set_server = gbk
collation_server = gbk_bin
character_set_server = gbk
collation_server = gbk_bin
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/26506993/viewspace-2076945/ ，如需转载，请注明出处，否则将追究法律责任。
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