5.5之后多了utf8mb4
XXX_general_ci（不区分大小写）
XXX_general_cs（区分大小写）
1 2 3 4 是占用字节数。
MySQL中可以对下面的结构指定字符集。
服务器层：server，数据库层：database，表：table，列：column
下面是数据库的字符集
改客户端的。
CHAR(30)在GBK字符集中，存储30个汉字。
如果可以控制网站的展示形态，可以考虑用gbk或者更小的db2312。
如果控制不了用户的输入：如微博或者基于用户名(可以有汉字的系统)一定要使用utf8
合理的使用字符集可以减少服务器带宽。
点击(此处)折叠或打开
-
mysql> show character set;
-
+----------+-----------------------------+---------------------+--------+
-
| Charset | Description | Default collation | Maxlen |
-
+----------+-----------------------------+---------------------+--------+
-
| big5 | Big5 Traditional Chinese | big5_chinese_ci | 2 |
-
| 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 |
-
| ujis | EUC-JP Japanese | ujis_japanese_ci | 3 |
-
| sjis | Shift-JIS Japanese | sjis_japanese_ci | 2 |
-
| hebrew | ISO 8859-8 Hebrew | hebrew_general_ci | 1 |
-
| tis620 | TIS620 Thai | tis620_thai_ci | 1 |
-
| euckr | EUC-KR Korean | euckr_korean_ci | 2 |
-
| 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 |
-
| ucs2 | UCS-2 Unicode | ucs2_general_ci | 2 |
-
| 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 |
-
| utf8mb4 | UTF-8 Unicode | utf8mb4_general_ci | 4 |
-
| cp1251 | Windows Cyrillic | cp1251_general_ci | 1 |
-
| utf16 | UTF-16 Unicode | utf16_general_ci | 4 |
-
| utf16le | UTF-16LE Unicode | utf16le_general_ci | 4 |
-
| cp1256 | Windows Arabic | cp1256_general_ci | 1 |
-
| cp1257 | Windows Baltic | cp1257_general_ci | 1 |
-
| utf32 | UTF-32 Unicode | utf32_general_ci | 4 |
-
| binary | Binary pseudo charset | binary | 1 |
-
| geostd8 | GEOSTD8 Georgian | geostd8_general_ci | 1 |
-
| cp932 | SJIS for Windows Japanese | cp932_japanese_ci | 2 |
-
| eucjpms | UJIS for Windows Japanese | eucjpms_japanese_ci | 3 |
-
+----------+-----------------------------+---------------------+--------+
- 40 rows in set (0.01 sec)
XXX_general_cs（区分大小写）
1 2 3 4 是占用字节数。
MySQL中可以对下面的结构指定字符集。
服务器层：server，数据库层：database，表：table，列：column
下面是数据库的字符集
点击(此处)折叠或打开
-
mysql> show create database employees;
-
+-----------+--------------------------------------------------------------------+
-
| Database | Create Database |
-
+-----------+--------------------------------------------------------------------+
-
| employees | CREATE DATABASE `employees` /*!40100 DEFAULT CHARACTER SET utf8 */ |
-
+-----------+--------------------------------------------------------------------+
- 1 row in set (0.00 sec)
点击(此处)折叠或打开
-
mysql> set names GBK;
-
Query OK, 0 rows affected (0.00 sec)
-
-
mysql> show variables like '%char%';
-
+--------------------------+----------------------------------+
-
| Variable_name | Value |
-
+--------------------------+----------------------------------+
-
| character_set_client | gbk |
-
| character_set_connection | gbk |
-
| character_set_database | utf8 |
-
| character_set_filesystem | binary |
-
| character_set_results | gbk |
-
| character_set_server | utf8 |
-
| character_set_system | utf8 |
-
| character_sets_dir | /mysql/mysql3306/share/charsets/ |
-
+--------------------------+----------------------------------+
- 8 rows in set (0.00 sec)
CHAR(30)在GBK字符集中，存储30个汉字。
如果可以控制网站的展示形态，可以考虑用gbk或者更小的db2312。
如果控制不了用户的输入：如微博或者基于用户名(可以有汉字的系统)一定要使用utf8
合理的使用字符集可以减少服务器带宽。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/29990276/viewspace-1768524/ ，如需转载，请注明出处，否则将追究法律责任。
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