修改linux上mysql数据库编码

问题:数据库编码引起的web服务插入数据库中文乱码问题.

1.进入mysql控制台.

注意:如果输入mysql -u root -p,出现enter password,我直接点击回车，结果出现如果下错误：

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

解决方案:不要加-u -p参数，默认使用root@localhost登录,如下:

username@password:~# cd /opt/mysql5610/mysql-5.6.12-linux-glibc2.5-x86_64/bin

username@password:~/mysql5610/mysql-5.6.12-linux-glibc2.5-x86_64/bin# ./mysql

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 2563

Server version: 5.6.12 MySQL Community Server (GPL)

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

2.查看mysql版本.

mysql> select version();

+-----------+

| version() |

+-----------+

| 5.6.12 |

+-----------+

1 row in set (0.02 sec)

3.查看mysql编码.

mysql> show variables like 'character%';

+--------------------------+----------------------------------+

| Variable_name | Value |

+--------------------------+----------------------------------+

| character_set_client | utf8 |

| character_set_connection | utf8 |

| character_set_database | latin1 |

| character_set_filesystem | binary |

| character_set_results | utf8 |

| character_set_server | latin1 |

| character_set_system | utf8 |

| character_sets_dir | /usr/local/mysql/share/charsets/ |

+--------------------------+----------------------------------+

8 rows in set (0.00 sec)

mysql>

4.修改mysql数据库编码.

查看my.cnf配置文件.

username@password:~/mysql5610/mysql-5.6.12-linux-glibc2.5-x86_64# cat my.cnf

# For advice on how to change settings please see

# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
[client]

default-character-set=utf8

[mysqld]

character-set-server=utf8

[mysql]

default-character-set=utf8

# Remove leading # and set to the amount of RAM for the most important data

# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.

# innodb_buffer_pool_size = 128M

# Remove leading # to turn on a very important data integrity option: logging

# changes to the binary log between backups.

# log_bin

# These are commonly set, remove the # and set as required.

# basedir = .....

# datadir = .....

# port = .....

# server_id = .....

# socket = .....

# Remove leading # to set options mainly useful for reporting servers.

# The server defaults are faster for transactions and fast SELECTs.

# Adjust sizes as needed, experiment to find the optimal values.

# join_buffer_size = 128M

# sort_buffer_size = 2M

# read_rnd_buffer_size = 2M

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

修改my.cnf配置文件,主要修改如下：

在[client]下追加default-character-set=utf8

在[mysqld]下追加character-set-server=utf8

在[mysql]下追加default-character-set=utf8

5.mysql数据库的停止与开启.

停止服务.

username@password:~/mysql5610/mysql-5.6.12-linux-glibc2.5-x86_64/bin# ./mysqladmin shutdown

开启服务:

注意:因为MySQL为了安全,不希望root用户直接启动mysql,所以启动mysql时要声明用户.

username@password:~/mysql5610/mysql-5.6.12-linux-glibc2.5-x86_64/bin# ./mysqld_safe --user=root

Warning: World-writable config file '/usr/local/mysql/my.cnf' is ignored

Warning: World-writable config file '/usr/local/mysql/my.cnf' is ignored

150209 11:36:05 mysqld_safe Logging to '/usr/local/mysql/data/msrv5.err'.

150209 11:36:05 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data

针对上面的警告,World-writable config file '/usr/local/mysql/my.cnf' is ignored

my.cnf的读取权限进行了设置,不允许World-writable(字面意思是全世界都可读写)

解决方法：

chmod 644 /usr/local/mysql/my.cnf

再次重新启动mysql,启动正常.

root@msrv5:~/mysql5610/mysql-5.6.12-linux-glibc2.5-x86_64/bin# ./mysqladmin shutdown

root@msrv5:~/mysql5610/mysql-5.6.12-linux-glibc2.5-x86_64/bin# ./mysqld_safe --user=root

150209 12:29:02 mysqld_safe Logging to '/usr/local/mysql/data/msrv5.err'.

150209 12:29:02 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data

6.进入mysql查看数据库编码.

mysql> show variables like 'character%';

+--------------------------+----------------------------------+

| Variable_name | Value |

+--------------------------+----------------------------------+

| character_set_client | utf8 |

| character_set_connection | utf8 |

| character_set_database | utf8 |

| character_set_filesystem | binary |

| character_set_results | utf8 |

| character_set_server | utf8 |

| character_set_system | utf8 |

| character_sets_dir | /usr/local/mysql/share/charsets/ |

+--------------------------+----------------------------------+

8 rows in set (0.00 sec)

ok!大功告成！