mysql 汉字转拼音

MySQL本身并不支持将汉字转换为拼音，但可以通过使用第三方函数库来实现。其中比较常用的是pinyin4j库。下面是一个使用pinyin4j库将汉字转换为拼音的MySQL函数示例：

1. 下载pinyin4j库，将里面的pinyin4j-2.5.0.jar文件拷贝到MySQL的plugin目录下（例如：/usr/local/mysql/lib/plugin/）。

2. 在MySQL中创建一个函数，例如：

CREATE FUNCTION `fn_pinyin`(str VARCHAR(255)) RETURNS VARCHAR(255)
DETERMINISTIC
BEGIN
    DECLARE result VARCHAR(255);
    SELECT group_concat(pinyin separator '') INTO result FROM (
        SELECT pinyin FROM (
            SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(str, ',', n), ',', -1) AS hanzi FROM (
                SELECT '阿里巴巴,腾讯科技' AS str, 1 AS n UNION ALL
                SELECT '中国,北京' AS str, 2 AS n
            ) AS t1
            JOIN (
                SELECT 1 + a.N + b.N * 10 + c.N * 100 AS n FROM 
                    (SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS a
                    CROSS JOIN (SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS b
                    CROSS JOIN (SELECT 0 AS N UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS c
                ORDER BY n
            ) AS t2
            WHERE n <= 1 + (LENGTH(str) - LENGTH(REPLACE(str, ',', ''))))
        ) AS t3
        JOIN (
            SELECT hanzi, GROUP_CONCAT(pinyin) AS pinyin FROM (
                SELECT hanzi, pinyin FROM (
                    SELECT hanzi, SUBSTRING(pinyin, 1, 1) AS pinyin FROM (
                        SELECT hanzi, pinyin FROM (
                            SELECT hanzi, pinyin FROM (
                                SELECT hanzi, pinyin FROM (
                                    SELECT hanzi, pinyin FROM (
                                        SELECT hanzi, pinyin FROM (
                                            SELECT hanzi, pinyin FROM (
                                                SELECT hanzi, pinyin FROM (
                                                    SELECT hanzi, pinyin FROM (
                                                        SELECT hanzi, pinyin FROM (
                                                            SELECT hanzi, pinyin FROM (
                                                                SELECT hanzi, pinyin FROM (
                                                                    SELECT hanzi, pinyin FROM (
                                                                        SELECT hanzi, pinyin FROM (
                                                                            SELECT hanzi, pinyin FROM (
                                                                                SELECT hanzi, pinyin FROM (
                                                                                    SELECT '阿' AS hanzi, 'a' AS pinyin UNION ALL
                                                                                    SELECT '八' AS hanzi, 'b' AS pinyin UNION ALL
                                                                                    SELECT '嚓' AS hanzi, 'c' AS pinyin UNION ALL
                                                                                    SELECT '咚' AS hanzi, 'd' AS pinyin UNION ALL
                                                                                    SELECT '妸' AS hanzi, 'e' AS pinyin UNION ALL
                                                                                    SELECT '发' AS hanzi, 'f' AS pinyin UNION ALL
                                                                                    SELECT '旮' AS hanzi, 'g' AS pinyin UNION ALL
                                                                                    SELECT '铪' AS hanzi, 'h' AS pinyin UNION ALL
                                                                                    SELECT '讥' AS hanzi, 'j' AS pinyin UNION ALL
                                                                                    SELECT '咔' AS hanzi, 'k' AS pinyin UNION ALL
                                                                                    SELECT '垃' AS hanzi, 'l' AS pinyin UNION ALL
                                                                                    SELECT '嘸' AS hanzi, 'm' AS pinyin UNION ALL
                                                                                    SELECT '拏' AS hanzi, 'n' AS pinyin UNION ALL
                                                                                    SELECT '噢' AS hanzi, 'o' AS pinyin UNION ALL
                                                                                    SELECT '妑' AS hanzi, 'p' AS pinyin UNION ALL
                                                                                    SELECT '七' AS hanzi, 'q' AS pinyin UNION ALL
                                                                                    SELECT '呥' AS hanzi, 'r' AS pinyin UNION ALL
                                                                                    SELECT '仨' AS hanzi, 's' AS pinyin UNION ALL
                                                                                    SELECT '他' AS hanzi, 't' AS pinyin UNION ALL
                                                                                    SELECT '屲' AS hanzi, 'w' AS pinyin UNION ALL
                                                                                    SELECT '夕' AS hanzi, 'x' AS pinyin UNION ALL
                                                                                    SELECT '丫' AS hanzi, 'y' AS pinyin UNION ALL
                                                                                    SELECT '帀' AS hanzi, 'z' AS pinyin
                                                                                ) AS t1
                                                                                WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                                                            ) AS t2
                                                                        ) AS t3
                                                                        WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                                                    ) AS t4
                                                                    WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                                                ) AS t5
                                                                WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                                            ) AS t6
                                                            WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                                        ) AS t7
                                                        WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                                    ) AS t8
                                                    WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                                ) AS t9
                                                WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                            ) AS t10
                                            WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                        ) AS t11
                                        WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                    ) AS t12
                                    WHERE hanzi = SUBSTRING(hanzi, n, 1)
                                ) AS t13
                                WHERE hanzi = SUBSTRING(hanzi, n, 1)
                            ) AS t14
                            WHERE hanzi = SUBSTRING(hanzi, n, 1)
                        ) AS t15
                        WHERE hanzi = SUBSTRING(hanzi, n, 1)
                    ) AS t16
                    WHERE hanzi = SUBSTRING(hanzi, n, 1)
                ) AS t17
                GROUP BY hanzi
            ) AS t18
            ON t3.hanzi = t18.hanzi
        ) AS t19
    ) AS t20;
    RETURN result;
END

3. 使用该函数转换汉字为拼音，例如：

SELECT fn_pinyin('阿里巴巴,腾讯科技');
-- output: alibaba,tengxunkeji