时间:2021-07-01 10:21:17 帮助过:4人阅读
function fn_find(@find varchar(8000), @str varchar(8000),
@n smallint)
returns int
as
begin
if @n < 1 return (0)
declare @start smallint,
@count smallint, @index smallint, @len smallint
set @index = charindex(@find,
@str)
if @index = 0 return (0)
else select @count =
1, @len = len(@find)
while @index > 0 and @count <
@n
begin
set @start = @index +
@len
select @index = charindex(@find,
@str, @start), @count = @count + 1
end
if @count < @n set @index =
0
return (@index)
end
go
第二步:
截取学生第N道题的答案和正确答案第N道题做比较,把做对的人的分数加1。
update dbo.T_dxyysyj_BankedCloze2_Record
set Fraction =Fraction +1
where QuestionID =‘3‘ and SUBSTRING(ExamAnswer,dbo.fn_find(@find,@str,@mystart)+1,@mylength)=SUBSTRING(@str,dbo.fn_find(@find,@str,@mystart)+1,@mylength)
第三步:
封装成存储过程。
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sqlserver 查找某个字符在字符串中第N次出现的位置
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