Oracle存储过程中去掉重复字符串函数

2/9/2008来源:Oracle教程人气:6109

以下函数是本人在编写Oracle数据库存储过程时写的函数,觉得该函数通用性较强,因此发表出来供需要的人参考。 这个函数的功能主要是用于去除给定字符串中重复的字符串.在使用中需要指定字符串的分隔符.示例: str := MyReplace('13,14,13,444', ','); 输出:
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;
取最后一个字符串:
arr(currentIndex) := substr(str, startIndex + 1, length(str));
去掉重复出现的字符串:
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);
数组置空:
arr(i) := ''; end if; end loop;
去掉前面的标识符:
Result := substr(str, 2, length(str)); return(Result); end MyReplace;