[freetds] Stored Procedure Output Parameters
Paul Robinson
paul.robinson at groupbc.com
Tue Aug 2 07:08:52 EDT 2005
We've been trying to use PHP 5.0.4 with FreeTDS 0.63 in order to enable
communication with a Windows 2000 Server running MS SQL Server 2000.
We ran into problems with input and output parameters that I believe
I've now solved. In order to do so I have had to change PHP code (which
I will be submitting as a PHP bug shortly) and I've added an extra
function to dblib/dblib.c to enable the calling application (PHP in this
case) to determine if the output parameter is NULL.
Diff is as follows:
3972a3973,3990
> int
> dbretisnull(DBPROCESS * dbproc, int retnum)
> {
> TDSCOLUMN *colinfo;
> TDSPARAMINFO *param_info;
> TDSSOCKET *tds;
>
> dbnumrets(dbproc);
>
> tds = (TDSSOCKET *) dbproc->tds_socket;
> param_info = tds->param_info;
> if (!param_info || !param_info->columns || retnum < 1 || retnum
> param_info->num_cols)
> return NULL;
>
> return tds_get_null(param_info->current_row, retnum - 1);
> }
>
>
I hope you'll either point out a more sensible way that I could have
implemented this without having to resort to implementing a new function
or you will consider this for inclusion in a future release.
For information the calling code in PHP (ext/mssql/php_mssql.c) looks
like this (in _mssql_get_sp_result inside the loop over the result columns):
is_null = dbretisnull(mssql_ptr->link, i);
if (is_null) {
ZVAL_NULL(bind->zval);
}
Thanks,
Paul
--
Paul Robinson
Systems Manager
Business Collaborator Ltd
WWW: http://www.groupbc.com
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