利用MySQL數據庫來處理中英文取首字母排序

咱們的聯繫人列表常常會有按照首字母排序的需求.  這個很方便, 很清晰, 若是不說性能如何, 就像讓數據庫來作呢? 其實MySQL是支持的.

咱們創建一個函數:

 

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;

 

 

而後咱們執行SQL

 

 

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 ;

 

 

看一下結果:

 

我以爲還行, 挺方便地.