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Oracle存儲過程中去掉重復字符串函數

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於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:

13,14,444
create 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;

取最後一個字符串:

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;
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