Oracle的漢字轉拼音首字母的函數

CREATE OR REPLACE FUNCTION F_PINYIN(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..NVL(LENGTH(P_NAME), 0) 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('發') 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('哢') 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;