FreeTDS Development Group

["Thompson, Bill D (London)" <ThompBil AT exchange.uk.ml.com>]

Hi,

Here's my two penn'orth...

I agree with james about the API issue, but that aside,  I can't see a
reason why the tds_convert call wouldn't convert this properly...

Could you tell the value of "conversion_type" and "size" as passed into
tds_convert ?

If these were correct, then all tds_convert really does is a sprintf()....

Bill

> -----Original Message-----
> From: Lowden, James K [SMTP:LowdenJK AT bernstein.com]
> Sent: 30 July 2003 15:58
> To:   'FreeTDS Development Group'
> Subject:      RE: [freetds] Problem with data type conversions and FreeTDS
> 
> > From: James Vanns [mailto:jimv AT canterbury.ac.uk]
> > Sent: July 30, 2003 9:13 AM
> > 
> > I had a friend create a table on his M$ SQL server 2000 with just one
> > row and as many columns as data types. He filled each field with a
> > different value corresponding to data type. E.g.
> > 
> > bigint, bit, char, datetime, float, money, nvarchar, unique
> > 1111119,1,c,30/04/2003 13:00:19,23.45, 123.45, hello, 
> > {F44A-etc-...blah}
> > 
> > Note the Unique identifier in the above example is not the 
> > real value I
> > just couldn't be bothered to write it out in full!
> > 
> > Anyway using the code snippet below works great except when trying to
> > convert and print the unique ID. What should I be doing to allow all
> > data types to be printed successfully as with tsql and sqsh?
> 
> Welcome, James.  
> 
> sqsh doesn't understand the uniqueidentifier datatype.  tsql does.  It's
> not
> a blob; it's a structure.  I don't know if it can be converted to an image
> or varbinary type.  It can be converted to char/varchar.  
> 
> $ tsql -S$S -U$U -P$P
> locale is "C"
> using default charset "ISO-8859-1"
> Msg 5703, Level 0, State 1, Server NTS0214, Line 0
> Changed language setting to us_english.
> 1> select newid()
> 2> go
> 
> 016BA787-C0A4-11D7-BAA8-0004ACE38BF3
> 1>
> 
> Does that answer your question?  
> 
> Supporting code for the conversion can be found in src/tds/convert.c.  
> 
> I note we don't test uniqueidentifier conversions in our unit test.
> Probably ought to.  
> 
> One last thing, if you don't mind my mentioning it.  We usually discourage
> people from using libtds directly, in favor of db-lib, ct-lib, and ODBC.
> Our TDS library is an internal convenience for us, and changes quite
> frequently.  The client libraries OTOH have external specifications we're
> striving to meet, so using them is to your advantage.  If you're sure you
> want to use libtds, that's fine, too, but you'll want to stay subscribed
> here to keep abreast of its metamorphosis.  
> 
> Hope that's of some use to you.  
> 
> --jkl
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