oracle汉字转拼音首字母函数

本内容来源网络，源自哪里我给忘了φ(゜▽゜*)♪。

我相信，大佬一定会原谅我的O(∩_∩)O

正题如下

• 这是个oracle函数，在sql窗口或者放在脚本里执行一下就可以开心的调用了o(*￣▽￣*)ブ;

• • 调用引例：

    SELECT HANZI_TO_PINYIN('李琛') FROM DUAL;
    

    dual最小表，只返回一条记录，目的就是维持句子语法完整。

    函数体如下：

    CREATE OR REPLACE FUNCTION HANZI_TO_PINYIN (P_NAME IN VARCHAR2)
        RETURN VARCHAR2
    AS
        V_COMPARE   VARCHAR2 (100);
        V_RETURN    VARCHAR2 (4000);
    BEGIN
        DECLARE
            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;
    END;