MySQL获取汉字的拼音首字母

最新推荐文章于 2021-01-19 22:34:21 发布

chituan8181

最新推荐文章于 2021-01-19 22:34:21 发布

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文章标签：数据库

原文链接：https://my.oschina.net/tangzhichao/blog/781535

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本文介绍两种在数据库中实现的函数，用于从输入的汉字字符串中提取首个汉字的拼音首字母。这两种方法分别通过不同的逻辑实现了相同的功能，能够帮助开发者在处理中文姓名或地址时快速生成拼音缩写。

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--获取汉字拼音首字母的函数其一
DROP FUNCTION IF EXISTS `GET_FIRST_PINYIN_CHAR`;
DELIMITER ;;
CREATE FUNCTION `GET_FIRST_PINYIN_CHAR`(PARAM VARCHAR(255)) RETURNS VARCHAR(2) CHARSET utf8 DETERMINISTIC BEGIN DECLARE V_RETURN VARCHAR(255);
    DECLARE V_FIRST_CHAR VARCHAR(2);
    SET V_FIRST_CHAR = UPPER(LEFT(PARAM,1));
    SET V_RETURN = V_FIRST_CHAR;
    IF LENGTH( V_FIRST_CHAR) <> CHARACTER_LENGTH( V_FIRST_CHAR ) THEN
    SET V_RETURN = ELT(INTERVAL(CONV(HEX(LEFT(CONVERT(PARAM 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 ;

--获取汉字拼音首字母的函数其二
DROP FUNCTION IF EXISTS `GET_FIRST_PINYIN_CHAR`;
DELIMITER ;;
CREATE FUNCTION `GET_FIRST_PINYIN_CHAR`(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 ;

转载于:https://my.oschina.net/tangzhichao/blog/781535