利用MySQL数据库来处理中英文取首字母排序
jopen
10年前
我们的联系人列表经常会有按照首字母排序的需求. 这个很方便, 很清晰, 如果不说性能如何, 就像让数据库来做呢? 其实MySQL是支持的.
我们建立一个函数:
DELIMITER $$ CREATE FUNCTION `fristPinyin`(P_NAME VARCHAR(255)) RETURNS varchar(255) CHARSET utf8 DETERMINISTIC BEGIN DECLARE V_RETURN VARCHAR(255); DECLARE V_BOOL INT DEFAULT 0; DECLARE FIRST_VARCHAR VARCHAR(1); SET FIRST_VARCHAR = left(CONVERT(P_NAME USING gbk),1); SELECT FIRST_VARCHAR REGEXP '[a-zA-Z]' INTO V_BOOL; IF V_BOOL = 1 THEN SET V_RETURN = FIRST_VARCHAR; ELSE SET V_RETURN = ELT(INTERVAL(CONV(HEX(left(CONVERT(P_NAME USING gbk),1)),16,10), 0xB0A1,0xB0C5,0xB2C1,0xB4EE,0xB6EA,0xB7A2,0xB8C1,0xB9FE,0xBBF7, 0xBFA6,0xC0AC,0xC2E8,0xC4C3,0xC5B6,0xC5BE,0xC6DA,0xC8BB, 0xC8F6,0xCBFA,0xCDDA,0xCEF4,0xD1B9,0xD4D1), 'A','B','C','D','E','F','G','H','J','K','L','M','N','O','P','Q','R','S','T','W','X','Y','Z'); END IF; RETURN V_RETURN; END$$ DELIMITER;
select intermediary_id, intermediary_name, fristPinyin(intermediary_name) as fristPinyin from t_second_agent_intermediary where city_id = 1337 and intermediary_type = 'zj' ORDER BY fristPinyin ;
来自：http://my.oschina.net/vernon/blog/351655