MySQL5中文乱码解决

MySql5中文乱码的解决方法在使用MYSQL时，插入中文字符，经常会出现乱码，中文全被用?代替。出现这种情况的原因，多是字符集不匹配造成的。
在MYSQL中，如果使用缺省的字符集，在建库、建表时，默认使用的是latin1字符集，为ISO 8859-1西欧字符集。插入中文字符时，与之不匹配，就会出现乱码。

要解决此问题，就必须手动将数据库Server和Client的字符编码改为gb2312。配置方法如下：
打开MYSQL安装目录下的my.ini文件，找到如下段落：

# CLIENT SECTION
# ----------------------------------------------------------------------
#
# The following options will be read by MySQL client applications.
# Note that only client applications shipped by MySQL are guaranteed
# to read this section. If you want your own MySQL client program to
# honor these values, you need to specify it as an option during the
# MySQL client library initialization.
#
[client]

port=3306

[mysql]

default-character-set=latin1


# SERVER SECTION
# ----------------------------------------------------------------------
#
# The following options will be read by the MySQL Server. Make sure that
# you have installed the server correctly (see above) so it reads this
# file.
#
[mysqld]

# The TCP/IP Port the MySQL Server will listen on
port=3306

#Path to installation directory. All paths are usually resolved relative to this.
basedir="D:/MySQL/MySQL Server 5.0/"

#Path to the database root
datadir="D:/MySQL/MySQL Server 5.0/Data/"

# The default character set that will be used when a new schema or table is
# created and no character set is defined
default-character-set=latin1

将其中的default-character-set=latin1改为default-character-set=gb2312,然后重启MYSQL(以前建立的数据库要重建),运行MySQL Command Line Client：
输入show variables like 'character_set_%';可以查看数据库的字符编码如下：

mysql> show variables like 'character_set_%';
+--------------------------+-----------------------------------------+
| Variable_name             | Value                                    |
+--------------------------+-----------------------------------------+
| character_set_client      | gb2312                                   |
| character_set_connection | gb2312                                   |
| character_set_database    | gb2312                                   |
| character_set_filesystem | binary                                   |
| character_set_results     | gb2312                                   |
| character_set_server      | gb2312                                   |
| character_set_system      | utf8                                     |
| character_sets_dir        | D:\MySQL\MySQL Server 5.0\share\charsets|
+--------------------------+-----------------------------------------+

然后，在程序中将连接数据库的URL改为jdbc:mysql://localhost:3306/databasename?useUnicode=true&characterEncoding=gb2312就可以了！

当然要支持国际化最好把以上所有gb2312换成utf8（注意不是utf-8，除了
在程序中将连接数据库的URL改为jdbc:mysql://localhost:3306/databasename?useUnicode=true&characterEncoding=utf-8）