以下函數是本人在編寫Oracle數據庫存儲過程時寫的函數,覺得該函數通用性較強,因此發表出來供需要的人參考。 這個函數的功能主要是用于去除給定字符串中重復的字符串.在使用中需要指定字符串的分隔符.示例: str := MyReplace('13,14,13,444', ','); 輸出: 13,14,444create or replace function MyReplace(oldStr varchar2, sign varchar2) return varchar2 is str varchar2(1000); currentIndex number; startIndex number; endIndex number; type str_type is table of varchar2(30) index by binary_integer; arr str_type; Result varchar2(1000);begin if oldStr is null then return (''); end if; str := oldStr; currentIndex := 0; startIndex := 0; loop currentIndex := currentIndex + 1; endIndex := instr(str, sign, 1, currentIndex); if (endIndex <= 0) then exit; end if; arr(currentIndex) := trim(substr(str, startIndex + 1, endIndex - startIndex - 1)); startIndex := endIndex; end loop;取最后一個字符串: arr(currentIndex) := substr(str, startIndex + 1, length(str));去掉重復出現的字符串: for i in 1.. currentIndex - 1 loop for j in i + 1..currentIndex loop if arr(i) = arr(j) then arr(j) := ''; end if; end loop; end loop; str := ''; for i in 1..currentIndex loop if arr(i) is not null then str := str sign arr(i);數組置空: arr(i) := ''; end if; end loop;去掉前面的標識符: Result := substr(str, 2, length(str)); return(Result);end MyReplace;