PRB: CDBException Thrown Opening Recordset on Stored Procedure

ID: Q170823

The information in this article applies to:

The Microsoft Foundation Classes (MFC), included with:
- Microsoft Visual C++, 32-bit Editions, versions 2.0, 2.1, 2.2, 4.0, 4.0a, 4.1, 4.2, 4.2b
- Microsoft Visual C++ for Windows, 16-bit edition, version 1.52

SYMPTOMS

When you use the "Call" syntax to invoke a stored procedure when opening a recordset, an exception might be thrown. Depending upon the version of Visual C++, whether or not you have DB Tracing enabled and the DBMS in use, you might see one of the following errors:


Version:        4.X
Message Box:    <See below for DBMS specific error message>
Output Window:  <See below for DBMS specific error message>
                State:37000,Native:<DBMS specific>,Origin:[<vendor>]
                  [<driver name/version>][<DBMS--optional>]
                Error: ODBC failure on SQLPrepare->


Version:        2.X
Message Box:    Internal application error.
Output Window:  <See below for DBMS specific error message>
                State:37000,Native:<DBMS specific>,Origin:[<vendor>]
                  [<driver name/version>][<DBMS--optional>]
                Error: ODBC failure on SQLPrepare.


Version:        1.5X
Message Box:    Internal application error.
Output Window:  <See below for DBMS specific error message>
                State:37000[<vendor>][<driver name/version>]
                [<DBMS--optional>]


DBMS specific error information:

DBMS                 Error String                   Native Code
------------------------------------------------------------------
SQL Server:  Incorrect syntax near the keyword 'EXEC'.     156

Access:      Syntax error in FROM clause.                -3506
(and other
 desktop
 drivers)

NOTE: If you are using Visual C++ 1.5X and connecting to a 16-bit SQL Server datasource, an exception may not be thrown but the desired result set is not returned.

CAUSE

While this line of code may appear to be a perfectly valid way to invoke a stored procedure, there is a small error:

m_pSet->Open(CRecordset::snapshot, "{ Call szCallTest}");

The space between the "{" and the "C" cause MFC to misinterpret the Call statement as the name of a table. MFC makes a case insensitive comparison between any SQL provided in the Open() call and the literal constant szCall, which is defined as _T("{call "). If the comparison fails, the provided SQL is incorrectly incorporated into a SELECT statement that is executed instead of the stored procedure call.

RESOLUTION

Make sure that there are no extra spaces between the first curly brace and the "Call" key word.

STATUS

This behavior is by design.

Additional query words:

Keywords : kbDatabase kbMFC kbODBC kbVC
Version : 2.0 2.1 2.2 4.0 4.0a 4.1 4.2 4.2
Platform : NT WINDOWS
Issue type : kbprb