create or replace function setstate(oldvalue varchar2, pos number, svalue varchar2)
return varchar2
isreturn_value varchar2 (20);
len number(8);
i number(8);
temp_value varchar2(1);
begin
len := length(oldvalue);
if pos > len then
return '指定的索引大於字串的長度！';
end if;
i := 0;
return_value := '';
for i in 1..len loop
temp_value := substr(oldvalue, i, 1);
if i = pos then
temp_value := svalue;
end if;
return_value := return_value || temp_value;
end loop;
return return_value;
end;
if exists(select * from sysobjects where name = 'setstate')
drop function setstate
gocreate function setstate(@oldvalue nvarchar(20), @pos int, @svalue nvarchar(1))
returns nvarchar(20)
asbegin
declare @return_value nvarchar(20),
@length int,
@i int,
@temp_value nvarchar(1);
set @length = len(@oldvalue);
set @i = 1;
set @return_value = '';
if(@pos > @length)
set @return_value = @oldvalue;
else
begin
while(@i <= @length)
begin
set @temp_value = substring(@oldvalue, @i, 1);
if (@i = @pos)
set @temp_value = @svalue;
set @return_value = @return_value + @temp_value;
set @i = @i + 1;
endend
return @return_value;
endgo
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