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combine multiple ntext columns into one pre-existing column

Posted on 2004-09-13
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Last Modified: 2010-05-18
Using an SQL query I need to combine several ntext columns into one preexsisting column.  Some columns may be NULL.

Table [Community Profile]

Columns [Community Sales Points],[General Notes],[Public Private Elem Secondary],[Colleges Universities],[Outdoor Activities],[Cultural Activities],[Shopping],[Industry],[Restaurant],[Church Denominations],[Health Fitness Ctrs]

I want to combine all columns into the first column [Community Sales Points].  I know this requires using the UPDATETEXT command, but I'm rather confused on the syntax.
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Question by:NoelKent
4 Comments
 
LVL 18

Expert Comment

by:SjoerdVerweij
ID: 12047593
How big is the content of these columns?

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LVL 13

Accepted Solution

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ispaleny earned 2000 total points
ID: 12049159
The following code provides sample ntext columns transformation A=A+B, modify it to sequential steps
1. A=A+B
2. A=A+C
3. A=A+D
And so on.
Too much code to be generated, but I think it is easy now :)


drop table [Community Profile Test]
create Table [Community Profile Test]
(
 [id] integer primary key
,[Community Sales Points] ntext
,[General Notes] ntext
)
GO
insert [Community Profile Test]([id],[Community Sales Points],[General Notes]) values (1,'2','3')
insert [Community Profile Test]([id],[Community Sales Points],[General Notes]) values (2,NULL,'3')
insert [Community Profile Test]([id],[Community Sales Points],[General Notes]) values (3,NULL,NULL)
insert [Community Profile Test]([id],[Community Sales Points],[General Notes]) values (4,'2',NULL)

select * from [Community Profile Test]

declare @c cursor;
declare @cid integer;
declare @cptr0 varbinary(16);
declare @clen0 integer;
declare @cptr1 varbinary(16);
set @c = cursor for
select
 [id]
,TEXTPTR            ([Community Profile Test].[Community Sales Points])    C0_PTR
,COALESCE(DATALENGTH([Community Profile Test].[Community Sales Points])/2,0) C0_LEN
,TEXTPTR            ([Community Profile Test].[General Notes])    C1_PTR
from [Community Profile Test]
;
open @c;
fetch @c into @cid,@cptr0,@clen0,@cptr1;
while @@fetch_status = 0 begin
 if @cptr1 is not null begin
  if @cptr0 is null begin
   update [Community Profile Test] set [Community Sales Points]='' where [id]=@cid;
   set @cptr0=(select TEXTPTR([Community Profile Test].[Community Sales Points]) from [Community Profile Test] where [id]=@cid);
   set @clen0=0
  end
  UPDATETEXT [Community Profile Test].[Community Sales Points] @cptr0 @clen0 0 [Community Profile Test].[General Notes] @cptr1
 end
 
 fetch @c into @cid,@cptr0,@clen0,@cptr1;
end;
close @c;
deallocate @c;

select * from [Community Profile Test]
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Author Comment

by:NoelKent
ID: 12049400
thanks ispaleny you rock!
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Expert Comment

by:DougR_MS
ID: 12383438
This is a solution I too have been looking for, but what about if the NTEXT field is part of replication?  Where would BEGIN TRAN and COMMIT TRAN belong so that the pointer is all in 1 transaction?

Thanks,
Doug
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