[freetds] IDENTITY column problem with bcp

Lowden, James K LowdenJK at bernstein.com
Wed Apr 23 10:23:03 EDT 2003


Bill, 

I'm working on bcp.c as part of the UTF-8 effort, including how columns are
described.  If you or anyone else can identify how the protocol signals the
server whether to honor or generate values for an Identity column, I could
probably add the logic.  

Current cvs will extract nchar columns and write UTF-8 data files if "client
charset" is UTF-8 in freetds.conf.  Uploading fails to convert [calls
tds_put_n()]; it simply sends the data verbatim.  As far as I can tell,
freebcp never could manage a round trip of nchar data: it would convert the
data to ASCII on extraction, but not "unconvert" them back to UCS-2 on
insertion.  

--jkl

> -----Original Message-----
> From: Thompson, Bill D (London) [mailto:ThompBil at exchange.uk.ml.com]
> Sent: April 23, 2003 5:33 AM
> To: 'FreeTDS Development Group'
> Subject: RE: [freetds] IDENTITY column problem with bcp
> 
> 
> Anwar,
> 
> Alas, I don't *think* that freebcp will support what you are 
> trying to do
> currently.
> Having had a look around the Sybase and Microsoft 
> documentation for their
> bcp implementations, it looks like we would have to enhance 
> freebcp to cater
> for bulk insert into tables with identity columns.
> 
> For the time being, all I can suggest is that you perform 
> your action in two
> stages:
> 
> 1) insert the data into a version of the table that does not have the
> identity column
> 2) copy the data over to the table that has the identity 
> column using a
> standard INSERT...SELECT statement, and let the server 
> allocate the identity
> column values for you.
> 
> Bill
> 
> > -----Original Message-----
> > From:	Anwar, Mohammed [SMTP:mohammed.anwar at intel.com]
> > Sent:	22 April 2003 18:44
> > To:	freetds at lists.ibiblio.org
> > Subject:	[freetds] IDENTITY column problem with bcp
> > 
> > Hi,
> > 	I am trying to bulk insert values into a table with an Identity
> > column.
> > 	
> > 	If I do not include the column in my data I receive an error
> > indicating that I am trying to insert a NULL value into a 
> column that does
> > not accept null.
> > 
> > 	If I insert a value then that value is actually 
> inserted into the
> > column (rather than created).
> > 	I read in some post on the web to use 0 and that the server will
> > automatically insert the identity value.
> > 	This does not work either.
> > 
> > 	I have tried bcp both from a file and using the bind variables.
> > 	
> > 	I am using SQL Server 2000, the scripts are running on linux.
> > 	The freetds.conf file indicates tds version = 7.0
> > 
> > 	The table creation SQL is as follows: 
> > 	CREATE TABLE [dbo].[TableName] (
> > 		[id] [bigint] IDENTITY (1, 1) NOT NULL ,
> > 		[signature] [bigint] NOT NULL ,
> > 		[name] [varchar] (128) COLLATE Latin1_General_BIN NULL
> > 	) ON [PRIMARY]
> > 
> > 	I would like to insert the data from variables or a file without
> > specifying the value for the id column.
> > 	Is there any way to specify to bcp that the id column is an
> > identity.
> > 
> > 	The id field is also the primary key which I create 
> after the data
> > has been inserted. So I need for it to be NOT NULL.
> > 	
> > 	I would really appreciate some help on this.
> > 
> > Thanks
> > Anwar
> > _______________________________________________
> > FreeTDS mailing list
> > FreeTDS at lists.ibiblio.org
> > http://lists.ibiblio.org/mailman/listinfo/freetds
> 
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> 


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