FreeTDS Development Group

["Lowden, James K" <LowdenJK AT bernstein.com>]

> From: Richard Cook
> Sent: Monday, January 03, 2005 11:03 AM
> 
> I need to convert my application that uses the MySQL database engine
to use
> MS-SQL.  Can anyone point me in the right directions for which
libraries I
> need to use?
> 
> I have some sample code that does a connect and an Insert.  I'd like
some
> sample code for Selecting data.
> 
> Here are the libraries that I have so far:
>       #include <tds.h>
>       #include <tdsconvert.h>
>       #include <ctype.h>
...
> Does anyone have some more complete sample code?  My application needs
to
> maintain a persistent connection, and perform multiple row Selects and
> Inserts/Updates.

First recommendation is not to use libtds.  It's a low-level library
that supports our client libraries.  Cf.
http://www.freetds.org/faq.html#Which_API.  

If you know ODBC, use ODBC.  Else I always recommend db-lib.  It's well
documented, easier than ODBC to set up (and use, IMHO), and supports
bcp, which may come in handy.  

BTW, one difference between MySQL SQL dialect and T-SQL is that the
latter doesn't support multi-row inserts.  MySQL accepts something like:

        INSERT INTO A (a, v) VALUES ('key1', 'value1', 'key2', 'value2')

The T-SQL INSERT syntax allows only one row's values in the VALUES
clause.  

In src/apps/bsqldb.c, you'll find a reasonably complete query processor
built on db-lib.  

HTH.  

--jkl

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