1. 直接修改字段对应的校对规则即可
2. 校对规则说明
```
utf8_bin 将字符串中的每一个字符用二进制数据存储，区分大小写。
utf8_genera_ci 不区分大小写，ci为case insensitive的缩写，即大小写不敏感。
utf8_general_cs 区分大小写，cs为case sensitive的缩写，即大小写敏感。
#### 3. 查看mysql 字符集所对应的校对规则
sql> show charset;
|Charset |Description |Default collation |Maxlen|
|--------|-------------------------------|-------------------|------|
|armscii8|ARMSCII-8 Armenian |armscii8_general_ci| 1|
|ascii |US ASCII |ascii_general_ci | 1|
|big5 |Big5 Traditional Chinese |big5_chinese_ci | 2|
|binary |Binary pseudo charset |binary | 1|
|cp1250 |Windows Central European |cp1250_general_ci | 1|
|cp1251 |Windows Cyrillic |cp1251_general_ci | 1|
|cp1256 |Windows Arabic |cp1256_general_ci | 1|
|cp1257 |Windows Baltic |cp1257_general_ci | 1|
|cp850 |DOS West European |cp850_general_ci | 1|
|cp852 |DOS Central European |cp852_general_ci | 1|
|cp866 |DOS Russian |cp866_general_ci | 1|
|cp932 |SJIS for Windows Japanese |cp932_japanese_ci | 2|
|dec8 |DEC West European |dec8_swedish_ci | 1|
|eucjpms |UJIS for Windows Japanese |eucjpms_japanese_ci| 3|
|euckr |EUC-KR Korean |euckr_korean_ci | 2|
|gb18030 |China National Standard GB18030|gb18030_chinese_ci | 4|
|gb2312 |GB2312 Simplified Chinese |gb2312_chinese_ci | 2|
|gbk |GBK Simplified Chinese |gbk_chinese_ci | 2|
|geostd8 |GEOSTD8 Georgian |geostd8_general_ci | 1|
|greek |ISO 8859-7 Greek |greek_general_ci | 1|
|hebrew |ISO 8859-8 Hebrew |hebrew_general_ci | 1|
|hp8 |HP West European |hp8_english_ci | 1|
|keybcs2 |DOS Kamenicky Czech-Slovak |keybcs2_general_ci | 1|
|koi8r |KOI8-R Relcom Russian |koi8r_general_ci | 1|
|koi8u |KOI8-U Ukrainian |koi8u_general_ci | 1|
|latin1 |cp1252 West European |latin1_swedish_ci | 1|
|latin2 |ISO 8859-2 Central European |latin2_general_ci | 1|
|latin5 |ISO 8859-9 Turkish |latin5_turkish_ci | 1|
|latin7 |ISO 8859-13 Baltic |latin7_general_ci | 1|
|macce |Mac Central European |macce_general_ci | 1|
|macroman|Mac West European |macroman_general_ci| 1|
|sjis |Shift-JIS Japanese |sjis_japanese_ci | 2|
|swe7 |7bit Swedish |swe7_swedish_ci | 1|
|tis620 |TIS620 Thai |tis620_thai_ci | 1|
|ucs2 |UCS-2 Unicode |ucs2_general_ci | 2|
|ujis |EUC-JP Japanese |ujis_japanese_ci | 3|
|utf16 |UTF-16 Unicode |utf16_general_ci | 4|
|utf16le |UTF-16LE Unicode |utf16le_general_ci | 4|
|utf32 |UTF-32 Unicode |utf32_general_ci | 4|
|utf8 |UTF-8 Unicode |utf8_general_ci | 3|
|utf8mb4 |UTF-8 Unicode |utf8mb4_0900_ai_ci | 4|
3. sql 使用示例
ALTER TABLE book MODIFY COLUMN name VARCHAR(255) BINARY CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '名称' AFTER `id`;
