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  • MySQL 自定义函数

    CREATE DEFINER=`root`@`%` FUNCTION `to_pinyin`(NAME VARCHAR(255) CHARSET gbk) RETURNS varchar(255) CHARSET gbk
    BEGIN  
        DECLARE mycode INT;  
        DECLARE tmp_lcode VARCHAR(2) CHARSET gbk;  
        DECLARE lcode INT;  
      
        DECLARE tmp_rcode VARCHAR(2) CHARSET gbk;  
        DECLARE rcode INT;  
      
        DECLARE mypy VARCHAR(255) CHARSET gbk DEFAULT '';  
        DECLARE lp INT;  
      
        SET mycode = 0;  
        SET lp = 1;  
      
        SET NAME = HEX(NAME);  
      
        WHILE lp < LENGTH(NAME) DO  
      
            SET tmp_lcode = SUBSTRING(NAME, lp, 2);  
            SET lcode = CAST(ASCII(UNHEX(tmp_lcode)) AS UNSIGNED);  
            SET tmp_rcode = SUBSTRING(NAME, lp + 2, 2);  
            SET rcode = CAST(ASCII(UNHEX(tmp_rcode)) AS UNSIGNED);  
            IF lcode > 128 THEN  
                SET mycode =65536 - lcode * 256 - rcode ;  
                SELECT CONCAT(mypy,pin_yin_) INTO mypy FROM t_base_pinyin WHERE CODE_ >= ABS(mycode) ORDER BY CODE_ ASC LIMIT 1;  
                SET lp = lp + 4;  
            ELSE  
                SET mypy = CONCAT(mypy,CHAR(CAST(ASCII(UNHEX(SUBSTRING(NAME, lp, 2))) AS UNSIGNED)));  
                SET lp = lp + 2;  
            END IF;  
        END WHILE;  
        RETURN LOWER(mypy);  
    END
    

      

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  • 原文地址:https://www.cnblogs.com/yuchuan/p/mysql_function_all_pinyin.html
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