mysql功能函数 实现拼音查询：
功能：输入中文字符串每个字的首字母，即可检索出相应数据。
使用方法:直接使用py(字段名)=‘keywords’，即可.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 |
DELIMITER $$ CREATE FUNCTION `PYFIRST`(P_NAME VARCHAR(255)) RETURNS varchar(255) CHARSET utf8 BEGIN DECLARE V_RETURN VARCHAR(255); SET V_RETURN = ELT(INTERVAL(CONV(HEX(left(CONVERT(P_NAME USING gbk),1)),16,10), 0xB0A1,0xB0C5,0xB2C1,0xB4EE,0xB6EA,0xB7A2,0xB8C1,0xB9FE,0xBBF7, 0xBFA6,0xC0AC,0xC2E8,0xC4C3,0xC5B6,0xC5BE,0xC6DA,0xC8BB, 0xC8F6,0xCBFA,0xCDDA,0xCEF4,0xD1B9,0xD4D1), 'A','B','C','D','E','F','G','H','J','K','L','M','N','O','P','Q','R','S','T','W','X','Y','Z'); RETURN V_RETURN; END$$ DELIMITER ; DELIMITER $$ CREATE FUNCTION `PY`(P_NAME VARCHAR(255)) RETURNS varchar(255) CHARSET utf8 BEGIN DECLARE V_COMPARE VARCHAR(255); DECLARE V_RETURN VARCHAR(255); DECLARE I INT; SET I = 1; SET V_RETURN = ''; while I < LENGTH(P_NAME) do SET V_COMPARE = SUBSTR(P_NAME, I, 1); IF (V_COMPARE != '') THEN #SET V_RETURN = CONCAT(V_RETURN, ',', V_COMPARE); SET V_RETURN = CONCAT(V_RETURN, PYFIRST(V_COMPARE)); #SET V_RETURN = PYFIRST(V_COMPARE); END IF; SET I = I + 1; end while; IF (ISNULL(V_RETURN) or V_RETURN = '') THEN SET V_RETURN = P_NAME; END IF; RETURN V_RETURN; END$$ DELIMITER ; |
