如何拆分ntext数据类型数据以存储在数据库中

Question

I have a column of type ntext called Emp_details_list , and it consists of data like

 emp1#@#emp2#@#emp3...

At most it has 20 thousand characters as string and I am storing in that column and I need to split it and save in other table EmpDet and in other column ( Single_Emp_det ) but while splitting I can't cast ntext as nvarchar so am using a local variable and declared as nvarchar(max) and splitting but I can store only 8000 character only if I have 8001 characters it showing exception because it can't store so how can I store whole ntext data in other column using splitting concept in SQL Server

Answer 1

So you are probably stuck with Sql server 2000. If you can't use nvarchar(max), one possible way is to may be use substring function and copy your ntext to manageable chunks of varchar(8000) in a loop. In each iteration, save the 'part of chunk after the last #', to be used in next iteration. So you basically loop over your table, within that loop again loop over the ntext field value in chunks of 8k and do the rest. Hope it is clear enough.

Answer 2

As others already mentioned you can easily store 20000 characters in nvarchar(max). You are probably doing something wrong when converting these types.

Here is an example of converting from and to nvarchar(max) that clearly shows how can you store 20000 characters there.

DECLARE @v1 nvarchar(max)

DECLARE @v2 nvarchar(max)



create table #textExample

(

    id int,

    t1 ntext

)



declare @count int

set @v1 = ''

SET @count = 0

while @count < 20000

begin  

   set @v1 = @v1 + '1'

   set @count = @count + 1

end

--converting nvarchar(max) to ntext

insert into #textExample

values (1, CONVERT(ntext,@v1))



select * from #textExample

-- converting ntext back to nvarchar(max)

SET @v2 = CONVERT(nvarchar(max), (select t1 from #textExample where id = 1))

select @v2, LEN(@v2)





drop table #textExample