[freetds] unixODBC via FreeTDS, PHP and Stored Procedure Help
Lowden, James K
LowdenJK at bernstein.com
Thu Jul 1 15:06:54 EDT 2004
> From: Joseph Geiser
> Sent: July 1, 2004 1:58 PM
> We're running a Linux (Fedora Core 2) server with PHP 4.3.6,
> FreeTDS 0.62.3 (using TDS 7.0) and unixODBC 2.2.8. Up to
> now, we've been running just fine using FreeTDS and the PHP
> "mssql" db calls with direct queries, but no stored procedures.
> After installing a fresh server (the one described above), we
> tested FreeTDS and for direct queries, it works just great.
> For Stored Procedures, if the call is written exactly as it
> would be written with TSQL/SQLQA, FreeTDS handles it.
> Straight queries through isql (unixODBC) execute just fine as
> well, but isql is not handling a Stored Procedure call at
> all. In an attempt to code with PHP, it's also failing.
To clarify, the PHP mssql extension uses db-lib, isql uses ODBC, and tsql uses the TDS layer directly. So, you really can't test the mssql extension with isql; at least, you're using different client libraries when you do.
We now have a db-lib test facility: bsqldb, first included in 0.62.3. (If you want a man page, though, get a nightly snapshot.) The attached script works with bsqldb; I'd be curious to know if isql can process it, too. But: all it's doing is T-SQL. If you use the -v option, bsqldb will show you that no parameters are returned as such to the client.
In the old days, Microsoft servers did return output parameter data when a stored procedure was called with "execute" in a T-SQL batch. Lately they don't; the application must use the rpc functions instead. We have unit test that demonstrates how.
That leaves PHP, which I don't use. Unless the mssql extension supports the db-lib rpc functions -- unless, that is, you see some explicit support for stored procedures and parameter binding -- you're not going to be able to fetch output parameters. The workaround is to call a wrapper procedure that selects the output values, creating a normal resultset.
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