oracle提取汉字拼音首字母

CREATE OR REPLACE FUNCTION PUB_GET_PY(p_zh_char CHAR DEFAULT '%')
       RETURN CHAR
IS

/********************************************************************
过程名称：PUB_GET_PY
功能：生成汉字拼音的首字符
********************************************************************/

---v_汉字内码
v_zh_char_code      NUMBER(8);
---v_拼音
v_py          CHAR(1);

BEGIN
v_zh_char_code := ASCII(p_zh_char);

IF v_zh_char_code BETWEEN 45217 AND 45252 THEN
    v_py := 'A';
ELSIF v_zh_char_code BETWEEN 45253 AND 45760 THEN
    v_py := 'B';
ELSIF v_zh_char_code BETWEEN 45761 AND 46317 THEN
    v_py := 'C';
ELSIF v_zh_char_code BETWEEN 46318 AND 46825 THEN
    v_py := 'D';
ELSIF v_zh_char_code BETWEEN 46826 AND 47009 THEN
    v_py := 'E';
ELSIF v_zh_char_code BETWEEN 47010 AND 47296 THEN
    v_py := 'F';
ELSIF v_zh_char_code BETWEEN 47297 AND 47613 THEN
    v_py := 'G';
ELSIF v_zh_char_code BETWEEN 47614 AND 48116 THEN
    v_py := 'H';
ELSIF v_zh_char_code BETWEEN 48117 AND 49061 THEN
    v_py := 'J';
ELSIF v_zh_char_code BETWEEN 49062 AND 49323 THEN
    v_py := 'K';
ELSIF v_zh_char_code BETWEEN 49324 AND 49895 THEN
    v_py := 'L';
ELSIF v_zh_char_code BETWEEN 49896 AND 50370 THEN
    v_py := 'M';
ELSIF v_zh_char_code BETWEEN 50371 AND 50613 THEN
    v_py := 'N';
ELSIF v_zh_char_code BETWEEN 50614 AND 50621 THEN
    v_py := 'O';
ELSIF v_zh_char_code BETWEEN 50622 AND 50925 THEN
    v_py := 'P';
ELSIF v_zh_char_code BETWEEN 50926 AND 51386 THEN
    v_py := 'Q';
ELSIF v_zh_char_code BETWEEN 51387 AND 51445 THEN
    v_py := 'R';
ELSIF v_zh_char_code BETWEEN 51446 AND 52217 THEN
    v_py := 'S';
ELSIF v_zh_char_code BETWEEN 52218 AND 52697 THEN
    v_py := 'T';
ELSIF v_zh_char_code BETWEEN 52698 AND 52979 THEN
    v_py := 'W';
ELSIF v_zh_char_code BETWEEN 52980 AND 53640 THEN
    v_py := 'X';
ELSIF v_zh_char_code BETWEEN 53641 AND 54480 THEN
    v_py := 'Y';
ELSIF v_zh_char_code BETWEEN 54481 AND 55289 THEN
    v_py := 'Z';
ELSE
    v_py := NULL;
END IF;

RETURN v_py;
END PUB_GET_PY;

提取汉字字符串的拼音的首字母，其中去掉空格保留原有字母和数字：

create or replace FUNCTION PUB_GET_STRING_PY(strs varchar2)
return varchar2
is
/***********************************
过程名称：PUB_GET_STRING_PY
功能：生成汉字字符串的拼音首字符
**********************************/

v_length number;
v_char varchar2(2);
v_charlength number;
v_charPY varchar2(2);
i int:=1;
myresult varchar2(500):='';

begin
--获取字符串长度
v_length:=length(strs);
while i<=v_length
loop
   --按顺序取得字符
   v_char:=substr(strs,i,1);
   v_charlength:=lengthb(rtrim(v_char));
   v_charPY:=rtrim(v_char);
   --判断是否是汉字
   if v_charlength=2 then
     v_charPY:=pub_get_py(rtrim(v_char));
   end if;
   --将拼音进行连接
   myresult:=myresult || v_charPY;
   i:=i+1;
end loop;

return myresult;
end PUB_GET_STRING_PY;

方法二： 获取拼音简码函数 

CREATE OR REPLACE FUNCTION GET_PYJM (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;