ORACLE中如何實現ASC字符串和16進制串互相轉換
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下面是筆者以前回答csdn論壇上問題的總結，希望對大家有用。
ASC字符串==>16進制串
create or replace function AscToHex(sIn IN varchar2)
RETURN varchar2
IS
sTmp varchar2(4000);
i integer;
BEGIN
i:=1;
stmp:='';
for i in 1..length(sIn) loop
sTmp:=sTmp||trim(to_char(ascii(substr(sIn,i,1)),'XXXX'));
end loop;
return sTmp;
END;
/
16進制串==>ASC字符串
要區分字符集，以中文字符爲例，對於數據庫字符集是中文，要保證能夠正確轉回來，要有所不同。
數據庫字符集是中文
create or replace function HexToAsc(sIn IN varchar2)
RETURN varchar2
IS
sTmp varchar2(4000);
i integer;
x integer;
BEGIN
i:=1;
stmp:='';
loop
exit when i>length(sIn);
x:=to_number(substr(sIn,i,2),'XXXX');
if x>128 then
sTmp:=sTmp||chr(to_number(substr(sIn,i,4),'XXXX'));
i:=i+4;
else
sTmp:=sTmp||chr(to_number(substr(sIn,i,2),'XXXX'));
i:=i+2;
end if;
end loop;
return sTmp;
END;
/
數據庫字符集是英文
create or replace function HexToAsc(sIn IN varchar2)
RETURN varchar2
IS
sTmp varchar2(4000);
i integer;
BEGIN
i:=1;
stmp:='';
loop
exit when i>length(sIn);
sTmp:=sTmp||chr(to_number(substr(sIn,i,2),'XXXX'));
i:=i+2;
end loop;
return sTmp;
END;
/
測試，如下：
SQL>select hextoasc(asctohex('你好ABC麼')) from dual;
HEXTOASC(ASCTOHEX('拿好ABC麼'))
--------------------------------------------------------------------------------
你好ABC麼
