MySQL修改环境的默认字符集为utf-8(当然你也可以设置成utf-8) ,首先得在服务里关掉MySQL的服务,然后到你的mysql的安装路径,如
MySQL修改环境的默认字符集为utf-8(当然你也可以设置成utf-8) ,首先得在服务里关掉MySQL的服务,然后到你的mysql的安装路径,如果是自定义就找到自定义的路径,,默认是:C:\Program Files\MySQL\MySQL Server 5.0\my.ini。
找到那个 client mysql 里加入 default-character-set=utf8
mysqld下面加入: default-character-set=utf8
init_connect='SET NAMES utf8'
下面语句用于查看编码方式是否已经修改:
show variables like 'char%';
如果是的你的之前的数据库没有设置好:
对于已经存在了的数据库,可以如下操作使其改变编码方式:
a. 修改MYSQL数据库编码,如果是MYSQL数据库编码不正确: 可以在MYSQL执行如下命令: ALTER DATABASE test DEFAULT CHARACTER SET utf8;
以上命令就是将MYSQL的test数据库的编码设为utf8
b. 修改MYSQL表的编码:ALTER TABLE category DEFAULT CHARACTER SET utf8;
以上命令就是将一个表category的编码改为utf8
c. 修改字段的编码:
ALTER TABLE `test` CHANGE `dd` `dd` VARCHAR( 45 ) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL
以上命令就是将MYSQL数据库test表中 dd的字段编码改为utf8
在命令行下插入汉字时如下代码:
set names gb2312;有时候这一句很关键!
insert into charset values('lmj');
然后再重启服务就可以 了。
如果出现无法启动服务的情况,就以管理员身份运行cmd先进入到mysql安装目录下,执行
mysqld -remove 移除服务
然后
mysqld -install 安装服务
就可以了

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InnoDB's lock mechanisms include shared locks, exclusive locks, intention locks, record locks, gap locks and next key locks. 1. Shared lock allows transactions to read data without preventing other transactions from reading. 2. Exclusive lock prevents other transactions from reading and modifying data. 3. Intention lock optimizes lock efficiency. 4. Record lock lock index record. 5. Gap lock locks index recording gap. 6. The next key lock is a combination of record lock and gap lock to ensure data consistency.


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