mysql字符集处理一例

mysql>show character set; \\显示系统支持的所有字符集
+----------+-----------------------------+---------------------+--------+
| Charset  | Description                 | Default collation   | Maxlen |
+----------+-----------------------------+---------------------+--------+
| dec8     | DEC West European           | dec8_swedish_ci     |      1 |
| cp850    | DOS West European           | cp850_general_ci    |      1 |
| hp8      | HP West European            | hp8_english_ci      |      1 |
| koi8r    | KOI8-R Relcom Russian       | koi8r_general_ci    |      1 |
| latin1   | cp1252 West European        | latin1_swedish_ci   |      1 |
| latin2   | ISO 8859-2 Central European | latin2_general_ci   |      1 |
| swe7     | 7bit Swedish                | swe7_swedish_ci     |      1 |
| ascii    | US ASCII                    | ascii_general_ci    |      1 |
| hebrew   | ISO 8859-8 Hebrew           | hebrew_general_ci   |      1 |
| koi8u    | KOI8-U Ukrainian            | koi8u_general_ci    |      1 |
| gb2312   | GB2312 Simplified Chinese   | gb2312_chinese_ci   |      2 |
| greek    | ISO 8859-7 Greek            | greek_general_ci    |      1 |
| cp1250   | Windows Central European    | cp1250_general_ci   |      1 |
| gbk      | GBK Simplified Chinese      | gbk_chinese_ci      |      2 |
| latin5   | ISO 8859-9 Turkish          | latin5_turkish_ci   |      1 |
| armscii8 | ARMSCII-8 Armenian          | armscii8_general_ci |      1 |
| utf8     | UTF-8 Unicode               | utf8_general_ci     |      3 |
| cp866    | DOS Russian                 | cp866_general_ci    |      1 |
| keybcs2  | DOS Kamenicky Czech-Slovak  | keybcs2_general_ci  |      1 |
| macce    | Mac Central European        | macce_general_ci    |      1 |
| macroman | Mac West European           | macroman_general_ci |      1 |
| cp852    | DOS Central European        | cp852_general_ci    |      1 |
| latin7   | ISO 8859-13 Baltic          | latin7_general_ci   |      1 |
| cp1251   | Windows Cyrillic            | cp1251_general_ci   |      1 |
| cp1256   | Windows Arabic              | cp1256_general_ci   |      1 |
| cp1257   | Windows Baltic              | cp1257_general_ci   |      1 |
| binary   | Binary pseudo charset       | binary              |      1 |
| geostd8  | GEOSTD8 Georgian            | geostd8_general_ci  |      1 |
+----------+-----------------------------+---------------------+--------+
28 rows in set (0.00 sec)

mysql> SHOW VARIABLES LIKE 'character%';  //查看默认字符集
+--------------------------+---------------------------------+
| Variable_name | Value |
+--------------------------+---------------------------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | latin1 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | D:"mysql-5.0.37"share"charsets" |
+--------------------------+---------------------------------+

  mysql> SHOW VARIABLES LIKE 'collation_%';//字符集的排序方式
+----------------------+-----------------+
| Variable_name | Value |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database | utf8_general_ci |
| collation_server | utf8_general_ci |
+----------------------+-----------------+

mysql> SET character_set_client = utf8 ;
     mysql> SET character_set_connection = utf8 ;
     mysql> SET character_set_database = utf8 ;
     mysql> SET character_set_results = utf8 ;
     mysql> SET character_set_server = utf8 ;

     mysql> SET collation_connection = utf8 ;
     mysql> SET collation_database = utf8 ;
     mysql> SET collation_server = utf8 ;

SET NAMES 'utf8';

它相当于下面的三句指令：
SET character_set_client = utf8;
SET character_set_results = utf8;
SET character_set_connection = utf8;

# groupadd mysql
# useradd mysql -g mysql -M -s /bin/false /nologin
# ./configure –prefix=/opt/mysql \ 指定安装目录
--without-debug \去除debug模式
--with-extra-charsets=gb2312 \添加gb2312中文字符支持
--enable-assembler \使用一些字符函数的汇编版本
--without-isam \去掉isam表类型支持 现在很少用了 isam表是一种依赖平台的表
--without-innodb \去掉innodb表支持 innodb是一种支持事务处理的表,适合企业级应用
--with-pthread \强制使用pthread库(posix线程库)
--enable-thread-safe-client \以线程方式编译客户端
--with-client-ldflags=-all-static \
--with-mysqld-ldflags=-all-static \以纯静态方式编译服务端和客户端 –with-raid \激活raid支持

# make
# make install
# scripts/mysql_install_db \生成mysql用户数据库和表文件
# cp support-files/my-medium.cnf /etc/my.cnf \copy配置文件,有large,medium,small三个环境下的,根据机器性能选择,如果负荷比较大,可修改里面的一些变量的内存使用值
# cp support-files/mysql.server /etc/init.d/mysqld //copy启动的mysqld文件
# chmod 700 /etc/init.d/mysqld  //修改权限只能由ROOT用户操作
# cd /web
# chmod 750 mysql -R
# chgrp mysql mysql -R
# chown mysql mysql/var -R

# chkconfig –add mysqld
# chkconfig –level 345 mysqld on
# service mysqld start
# netstat -atln