MySql字符串编码问题

阳光穿透心脏的1/2处 2022-05-16 10:14 157阅读 0赞

mysql编码设置  
查看系统的字符集和排序方式的设定可以通过下面的两条命令或mysql> status 。   
  
  
mysql> SHOW VARIABLES LIKE 'character\_set\_%';   
\+--------------------------+----------------------------+   
| Variable\_name | Value |   
\+--------------------------+----------------------------+   
| character\_set\_client | latin1 |   
| character\_set\_connection | latin1 |   
| character\_set\_database | latin1 |   
| character\_set\_results | latin1 |   
| character\_set\_server | latin1 |   
| character\_set\_system | utf8 |   
| character\_sets\_dir | /usr/share/mysql/charsets/ |   
\+--------------------------+----------------------------+   
7 rows in set (0.00 sec)   
  
  
mysql> SHOW VARIABLES LIKE 'collation\_%';   
\+----------------------+-------------------+   
| Variable\_name | Value |   
\+----------------------+-------------------+   
| collation\_connection | latin1\_swedish\_ci |   
| collation\_database | latin1\_swedish\_ci |   
| collation\_server | latin1\_swedish\_ci |   
\+----------------------+-------------------+   
3 rows in set (0.00 sec)   
  
  
上面列出的值就是系统的默认值。(很奇怪系统怎么默认是latin1的瑞典语排序方式)...   
  
  
当我们按照原来的方式通过PHP存取MySQL数据库时，就算设置了表的默认字符集为utf8并且通过UTF-8编码发送查询，你会发现存入数据库的仍然是乱码。问题就出在这个connection连接层上。解决方法是在发送查询前执行一下下面这句：   
  
  
1.  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;   
  
  
2. 创建数据库   
mysql> create database name character set utf8;   
  
  
3. 创建表   
CREATE TABLE \`type\` (   
\`id\` int(10) unsigned NOT NULL auto\_increment,   
\`flag\_deleted\` enum('Y','N') character set utf8 NOT NULL default 'N',   
\`flag\_type\` int(5) NOT NULL default '0',   
\`type\_name\` varchar(50) character set utf8 NOT NULL default '',   
PRIMARY KEY (\`id\`)   
)  DEFAULT CHARSET=utf8;   
  
  
4. 修改数据库成utf8的.   
mysql> alter database name character set utf8;   
  
  
5. 修改表默认用utf8.   
mysql> alter table type character set utf8;   
  
  
6. 修改字段用utf8   
mysql> alter table type modify type\_name varchar(50) CHARACTER SET utf8;