--定义游标,循环处理数据
declare @id int
declare #tb cursor for select id from hello
open #tb
fetch next from #tb into @id
while @@fetch_status=0
begin
--字符串替换处理
declare @p varbinary(16),@postion int,@rplen int
select @p=textptr(CONTENT),@rplen=len(@s_str),@postion=charindex(@s_str,CONTENT)-1 from hello where id=@id
while @postion>0
begin
updatetext hello.CONTENT @p @postion @rplen @d_str
select @postion=charindex(@s_str,CONTENT)-1 from hello where id=@id
end
fetch next from #tb into @id
end
close #tb
deallocate #tb
--字符串替换处理
declare @p varbinary(16),@postion int,@rplen int
select @p=textptr(aa),@rplen=len(@s_str),@postion=charindex(@s_str,aa)-1 from #tb
while @postion>0
begin
updatetext #tb.aa @p @postion @rplen @d_str
select @postion=charindex(@s_str,aa)-1 from #tb
end
--显示结果
select * from #tb
--删除数据测试环境
drop table #tb
/****************全部替换************************/
DECLARE @ptrval binary(16)
SELECT @ptrval = TEXTPTR(aa) FROM #tb WHERE aa like '%数据2%'
if @ptrval is not null -- 一定要加上此句,否则若找不到数据下一句就会报错
UPDATETEXT #tb.aa @ptrval 0 null '数据3'
总结:
1:Text字段类型不能直接用replace函数来替换,必须用updatetext
2:字段比较不能用 where 字段 = ‘某数据’,可以用like来代替
3:updatetext时,若@ptrval值为空会出错,需注意。
create table test(id int identity(1,1),content text)
insert test values('asdfsdfasdfsadfsdjflk大力sdjflkasjdf;lasdjf;lafsd')
insert test values('fdsgdsfgdfgsdfghrtjtyjkhkhjkhjljk大力ljk;jk;kl;kl;kl;')
go
create proc 替换
@s_str varchar(100),
@d_str varchar(100)
as
declare @id int
declare #tb cursor for select id from test
open #tb
fetch next from #tb into @id
while @@fetch_status=0
begin
declare @p varbinary(16),@postion int,@rplen int
select @p=textptr(CONTENT),@rplen=len(@s_str),@postion=charindex(@s_str,CONTENT)-1 from test where id=@id
while @postion>0
begin
updatetext test.CONTENT @p @postion @rplen @d_str
select @postion=charindex(@s_str,content)-1 from test where id=@id
end
fetch next from #tb into @id
end
close #tb
deallocate #tb
go