mysql 修改编码失败怎么办

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mysql 修改编码不成功解决办法

问题描述：

改为UTF8之后，重新进入mysql,它又自动改回latin1

有个方法很简单，在连接url后加上如下代码即可：

复制代码?useUnicode=true&characterEncoding=UTF-81
?useUnicode=true&amp;characterEncoding=UTF-8
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特别注意，两个属性之间一定要用&符号的转义符，且不能带空格，否则会报错。

例子如下 hibernate.cfg.xml配置文件：

复制代码<? xml version = '1.0' encoding = 'UTF-8' ?>
<!DOCTYPE hibernate-configuration PUBLIC
           "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
           "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 
     <!-- Generated by MyEclipse Hibernate Tools.                   -->
< hibernate-configuration >
 
     < session-factory >
         < property name = "dialect" >
             org.hibernate.dialect.MySQLDialect
         </ property >
         < property name = "connection.url" >
             jdbc:mysql://localhost:3306/share?useUnicode=true&characterEncoding=UTF-8
         </ property >
         < property name = "connection.username" >root</ property >
         < property name = "connection.password" >accp</ property >
         < property name = "connection.driver_class" >
             com.mysql.jdbc.Driver
         </ property >
         < property name = "myeclipse.connection.profile" >ssh</ property >
         < property name = "show_sql" >true</ property >
         < property name = "format_sql" >true</ property >
         < mapping resource = "cn/lihuoqing/po/ShUser.hbm.xml" />
         < mapping resource = "cn/lihuoqing/po/ShOptions.hbm.xml" />
         < mapping resource = "cn/lihuoqing/po/ShFiles.hbm.xml" />
         < mapping resource = "cn/lihuoqing/po/ShComments.hbm.xml" />
         < mapping resource = "cn/lihuoqing/po/ShDown.hbm.xml" />
     </ session-factory >
</ hibernate-configuration >1
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<? xml version = '1.0' encoding = 'UTF-8' ?>
<!DOCTYPE hibernate-configuration PUBLIC
           "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
           "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 
     <!-- Generated by MyEclipse Hibernate Tools.                   -->
< hibernate-configuration >
 
     < session-factory >
         < property name = "dialect" >
             org.hibernate.dialect.MySQLDialect
         </ property >
         < property name = "connection.url" >
             jdbc:mysql://localhost:3306/share?useUnicode=true&amp;characterEncoding=UTF-8
         </ property >
         < property name = "connection.username" >root</ property >
         < property name = "connection.password" >accp</ property >
         < property name = "connection.driver_class" >
             com.mysql.jdbc.Driver
         </ property >
         < property name = "myeclipse.connection.profile" >ssh</ property >
         < property name = "show_sql" >true</ property >
         < property name = "format_sql" >true</ property >
         < mapping resource = "cn/lihuoqing/po/ShUser.hbm.xml" />
         < mapping resource = "cn/lihuoqing/po/ShOptions.hbm.xml" />
         < mapping resource = "cn/lihuoqing/po/ShFiles.hbm.xml" />
         < mapping resource = "cn/lihuoqing/po/ShComments.hbm.xml" />
         < mapping resource = "cn/lihuoqing/po/ShDown.hbm.xml" />
     </ session-factory >
</ hibernate-configuration >
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=================================

1 修改数据库级

a. 临时更改：

mysql>SET GLOBAL character_set_database=utf8;

b. 永久更改：

改了服务器级就可以了

2.修改表级

复制代码mysql>ALTER TABLE table_name DEFAULT CHARSET utf8;1
mysql>ALTER TABLE table_name DEFAULT CHARSET utf8;
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更改了后永久生效

3.修改列级

修改示例：

复制代码          mysql>alter 
table `products` change `products_model` `products_model` varchar( 20 ) 
         character set  utf8 collate utf8_general_ci null default null;1
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mysql>alter 
table `products` change `products_model` `products_model` varchar( 20 ) 
         character set  utf8 collate utf8_general_ci null default null;
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更改了后永久生效

4.更改连接字符集

a. 临时更改：

mysql> set names utf8;

b. 永久更改：

修改my.ini文件（linux 为my.cnf）

从my.ini下手

复制代码     [client]
       default-character-set=utf8
       [mysql]
        default-character-set=utf8
        [mysqld]
       default-character-set=utf81
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[client]
       default-character-set=utf8
       [mysql]
        default-character-set=utf8
        [mysqld]
       default-character-set=utf8
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linux 下修改这里容易遇到问题，出错后请参考http://blog.csdn.net/zhongdajiajiao/article/details/51698845

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