Mysql 5.5 設定資料庫引數

feelpurple發表於2016-04-07
MySql資料庫
可以透過SET命令來更改資料庫的引數

--全域性級別
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來修改
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)

--會話級別

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查詢的是會話級別的引數

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命令設定的引數，在資料庫重啟後，相關的引數也會失效；如果想讓引數永久生效，可以將引數寫在配置檔案裡面。

[root@localhost mysql]# vim /etc/my.cnf

# Character set
character_set_server = gbk
collation_server = gbk_bin

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/26506993/viewspace-2076945/，如需轉載，請註明出處，否則將追究法律責任。

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