ORACLE根据中文拼音首字母排序、取得中文拼音首字母函数

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ORACLE根据中文拼音首字母排序、取得中文拼音首字母函数

    根据中文拼音首字母排序、取得中文拼音首字母函数
    介绍根据中文的首字母、笔画、部首排序函数【NLSSORT】：
     
    1）、首字母
     
    SELECT * FROM T_TABLE ORDER BY NLSSORT(NAME, ‘NLS_SORT=SCHINESE_PINYIN_M‘);
     
    2）、笔画
    SELECT * FROM T_TABLE ORDER BY NLSSORT(NAME, ‘NLS_SORT=SCHINESE_STROKE_M‘);
     
    3）、部首
    SELECT * FROM T_TABLE ORDER BY NLSSORT(NAME, ‘NLS_SORT=SCHINESE_RADICAL_M‘);
     
    列表一行汉字
    WITH A AS
    (SELECT ‘获取汉字拼音首字母‘ W FROM DUAL)
    SELECT SUBSTR(W, ROWNUM, 1) FROM A 
    CONNECT BY ROWNUM <= (SELECT LENGTH(W) FROM A);
    返回结果
    获
    取
    汉
    字
    拼
    音
    首
    字
    母
     
    用汉字字符集对这个列表进行排序
    WITH A AS  -www.2cto.com-
    (SELECT ‘获取汉字拼音首字母‘ W FROM DUAL)
    SELECT SUBSTR(W, ROWNUM, 1) FROM A 
    CONNECT BY ROWNUM <= (SELECT LENGTH(W) FROM A)
    ORDER BY NLSSORT(SUBSTR(W, ROWNUM, 1), ‘NLS_SORT=SCHINESE_PINYIN_M‘);
    返回结果
    汉
    获
    母
    拼
    取
    首
    音
    字
    字
     
    那么根据这个原理，上面输入一个拼音A打头的字"澳"，后面输入一个B大头的字"吧"，找到每个音节的起止的汉字是哪个
    WITH A AS
    (
    SELECT ROWNUM RN, CHR(ROWNUM) C FROM DUAL CONNECT BY LEVEL <= 65535
    )
    SELECT * FROM A WHERE LENGTHB(C) = 2
    AND RN > 32768  -www.2cto.com-
    AND NLSSORT(C, ‘NLS_SORT=SCHINESE_PINYIN_M‘) > NLSSORT(‘澳‘, ‘NLS_SORT=SCHINESE_PINYIN_M‘)
    AND NLSSORT(C, ‘NLS_SORT=SCHINESE_PINYIN_M‘) < NLSSORT(‘吧‘, ‘NLS_SORT=SCHINESE_PINYIN_M‘)
    ORDER BY NLSSORT(C, ‘NLS_SORT=SCHINESE_PINYIN_M‘);
    根据返回的结果，就能看到，A的结束和B的开始的汉子分别是：“驁” “八”，依次类推可以找到其他的分界点，那么最后的函数就是如下：
     
    CREATE OR REPLACE FUNCTION F_TRANS_PINYIN_CAPITAL(P_NAME IN VARCHAR2) RETURN VARCHAR2 AS
    V_COMPARE VARCHAR2(100);
    V_RETURN VARCHAR2(4000);
     
    FUNCTION F_NLSSORT(P_WORD IN VARCHAR2) RETURN VARCHAR2 AS
    BEGIN
    RETURN NLSSORT(P_WORD, ‘NLS_SORT=SCHINESE_PINYIN_M‘);
    END;
    BEGIN 
    FOR I IN 1..LENGTH(P_NAME) LOOP
    V_COMPARE := F_NLSSORT(SUBSTR(P_NAME, I, 1));
    IF V_COMPARE >= F_NLSSORT(‘ 吖 ‘) AND V_COMPARE <= F_NLSSORT(‘驁 ‘) THEN
    V_RETURN := V_RETURN || ‘a‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘八 ‘) AND V_COMPARE <= F_NLSSORT(‘簿 ‘) THEN
    V_RETURN := V_RETURN || ‘b‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘嚓 ‘) AND V_COMPARE <= F_NLSSORT(‘錯 ‘) THEN
    V_RETURN := V_RETURN || ‘c‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘咑 ‘) AND V_COMPARE <= F_NLSSORT(‘鵽 ‘) THEN
    V_RETURN := V_RETURN || ‘d‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘妸 ‘) AND V_COMPARE <= F_NLSSORT(‘樲 ‘) THEN
    V_RETURN := V_RETURN || ‘e‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘发 ‘) AND V_COMPARE <= F_NLSSORT(‘猤 ‘) THEN
    V_RETURN := V_RETURN || ‘f‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘旮 ‘) AND V_COMPARE <= F_NLSSORT(‘腂 ‘) THEN
    V_RETURN := V_RETURN || ‘g‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘妎 ‘) AND V_COMPARE <= F_NLSSORT(‘夻 ‘) THEN
    V_RETURN := V_RETURN || ‘h‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘丌 ‘) AND V_COMPARE <= F_NLSSORT(‘攈 ‘) THEN
    V_RETURN := V_RETURN || ‘j‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘咔 ‘) AND V_COMPARE <= F_NLSSORT(‘穒 ‘) THEN
    V_RETURN := V_RETURN || ‘k‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘垃 ‘) AND V_COMPARE <= F_NLSSORT(‘擽 ‘) THEN
    V_RETURN := V_RETURN || ‘l‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘嘸 ‘) AND V_COMPARE <= F_NLSSORT(‘椧 ‘) THEN
    V_RETURN := V_RETURN || ‘m‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘拏 ‘) AND V_COMPARE <= F_NLSSORT(‘瘧 ‘) THEN
    V_RETURN := V_RETURN || ‘n‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘筽 ‘) AND V_COMPARE <= F_NLSSORT(‘漚 ‘) THEN
    V_RETURN := V_RETURN || ‘o‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘妑 ‘) AND V_COMPARE <= F_NLSSORT(‘曝 ‘) THEN
    V_RETURN := V_RETURN || ‘p‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘七 ‘) AND V_COMPARE <= F_NLSSORT(‘裠 ‘) THEN
    V_RETURN := V_RETURN || ‘q‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘亽 ‘) AND V_COMPARE <= F_NLSSORT(‘鶸 ‘) THEN
    V_RETURN := V_RETURN || ‘r‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘仨 ‘) AND V_COMPARE <= F_NLSSORT(‘蜶 ‘) THEN
    V_RETURN := V_RETURN || ‘s‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘侤 ‘) AND V_COMPARE <= F_NLSSORT(‘籜 ‘) THEN
    V_RETURN := V_RETURN || ‘t‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘屲 ‘) AND V_COMPARE <= F_NLSSORT(‘鶩 ‘) THEN
    V_RETURN := V_RETURN || ‘w‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘夕 ‘) AND V_COMPARE <= F_NLSSORT(‘鑂 ‘) THEN
    V_RETURN := V_RETURN || ‘x‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘丫 ‘) AND V_COMPARE <= F_NLSSORT(‘韻 ‘) THEN
    V_RETURN := V_RETURN || ‘y‘;
    ELSIF V_COMPARE >= F_NLSSORT(‘帀 ‘) AND V_COMPARE <= F_NLSSORT(‘咗 ‘) THEN
    V_RETURN := V_RETURN || ‘z‘;
    END IF;
    END LOOP;
    RETURN V_RETURN;
    END;
     
    测试一下：
    SELECT F_TRANS_PINYIN_CAPITAL(‘王德封‘) FROM DUAL    
    返回首字母：wdf

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ORACLE根据中文拼音首字母排序、取得中文拼音首字母函数

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原文地址：http://www.cnblogs.com/huanghaifeng1123/p/4742360.html