因为有需求要把中文名城市的城市按照拼音的首字母进行查询,而数据库里没有字段记录城市的首字母,所以就必须在现有的数据里把城市的首字母动态的计算出来,在网上so了很多资料,也试了很多次,终于成功了。现在在这里做个记录,方便以后有需要的时候查看。
初始字段为:
执行mysql语句:
Select tableName.id,tableName.name,tableName.pid,tableName.show_level,
ELT(INTERVAL(CONV(HEX(left(CONVERT(tableName.name USING gbk),1)),16,10),
0xB0A1,0xB0C5,0xB2C1,0xB4EE,0xB6EA,0xB7A2,0xB8C1,0xB9FE,0xBBF7,
0xBFA6,0xC0AC,0xC2E8,0xC4C3,0xC5B6,0xC5BE,0xC6DA,0xC8BB,0xC8F6,
0xCBFA,0xCDDA,0xCEF4,0xD1B9,0xD4D1),
'A','B','C','D','E','F','G','H','J','K','L','M','N','O','P',
'Q','R','S','T','W','X','Y','Z') as category
FROM tableName ORDER BY tableName.id
执行结果为:
注意最后一栏,成功~~