SQL Server Native Client (SNAC) is not supported beyond SQL Server 2012. Avoid using SNAC in new development work, and plan to modify applications that currently use it. The Microsoft ODBC Driver for SQL Server provides native connectivity from Windows to Microsoft SQL Server and Microsoft Azure SQL Database.
Improvements in the database engine beginning with SQL Server 2012 allow SQLNumParams to obtain more accurate descriptions of the expected results. These more accurate results may differ from the values returned by SQLNumParams in previous versions of SQL Server.
For more information, see Metadata Discovery.