如何提高SQL函数的性能？

Question

我在mySQL（mySQL中的第一个函数）中编写了一个简单的搜索函数，这对我来说效果很好，但性能很糟糕。我使用一个非常大的数据库，需要5秒才能得到结果。这需要太长时间。要比较，搜索＆＃34;如％＆＃34;不到0.1秒。

DELIMITER $$
CREATE FUNCTION search (myColumn VARCHAR (255), mySearch VARCHAR (255)) RETURNS INT
BEGIN
    DECLARE i, j, scorePoints, columnLength INT;
    DECLARE result, aSpace VARCHAR (225);
    SET i = 1, j = 1, scorePoints = 0, columnLength = CHAR_LENGTH(myColumn);
    WHILE (j <= columnLength) DO
        SET result = STRCMP(SUBSTRING(myColumn, j, 1), SUBSTRING(mySearch, i, 1));
        IF (result = '0') THEN SET scorePoints = (scorePoints + 1); END IF;
        SET aSpace = STRCMP(SUBSTRING(myColumn, j, 1), " ");
        IF aSpace = '0'THEN SET i = 0; END IF;
        SET i = (i + 1), j = (j + 1);
    END WHILE;
    RETURN (scorePoints - columnLength);
END $$
DELIMITER ;


SELECT 
    CONCAT_WS(' ', t.name, t.familyname) AS myData,
    SEARCH(CONCAT_WS(' ', t.name, t.familyname), REPLACE('ABC', ' ', '')) AS score,
    t.name,
    t.familyname
FROM
    myTable t
WHERE
    CONCAT_WS(' ', t.name, t.familyname) LIKE 'ABC%'
ORDER BY score DESC;

我需要＆lt; 1秒的总时间。请有人帮助我提高这个mySQL函数的性能。

非常感谢。

托马斯。