BUG: "Syntax Error in PARAMETER clause" When Opening an MFC DAO Recordset

ID: Q233972

The information in this article applies to:

The Microsoft Foundation Classes (MFC), included with:
- Microsoft Visual C++, 32-bit Editions, version 6.0

SYMPTOMS

When opening an MFC DAO Recordset on an Microsoft Access parameterized query in an MFC AppWizard project, the application displays a message box containing the following error:

Syntax error in PARAMETER clause

The error occurs when the parameter names for the query have a space in them; for example, "Param 1".

CAUSE

CDaoRecordset does not build the PARAMETERS clause correctly. For example, the following SQL statement may be constructed:


PARAMETERS Some Param Text;
SELECT * from [AccessQuery]

The syntax error occurs because of the space between "Some" and "Param".

RESOLUTION

Following are two ways to work around the problem:

You can change the string returned from the GetDefaultSQL() function from the following
```
CString CAccessParamSet::GetDefaultSQL()
{
   return _T("[AccessQuery]");
} 
```
to the following:
```
CString CAccessParamSet::GetDefaultSQL()
{
   return _T("select * from [AccessQuery]");
} 
```
This prevents MFC from constructing a "PARAMETERS" clause as part of the SQL statement.

You can change the DDX function for the parameter in the DoFieldExchange() function to include square brackets around the parameter name. For example, in the recordset's DoFieldExchange() function, change the following
```
DFX_Text(pFX, _T("param 1"), m_param_1); 
```
to the following:
```
DFX_Text(pFX, _T("[param 1]"), m_param_1); 
```
You may encounter additional problems if the wizard mapped the DFX_Text() function to a numeric parameter. The DFX_Text() function attempts to construct a PARAMETERS clause with "text" as the data type. If the parameter is really a number, you will get a datatype mismatch. You may want to suppress the creation of a PARAMETERS clause in the SQL statement by implementing the first workaround or you may want to use a different DFX function, such as DFX_Long() instead of DFX_Text().

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

Create a query in Microsoft Access that contains an input parameter.

Create an MFC AppWizard project that accesses the query created in step 1.

Run the Application.

Additional query words:


Keywords          : kbDAO350 kbDatabase kbMFC kbAppWizard kbGrpVCDB 
Version           : winnt:6.0
Platform          : winnt 
Issue type        : kbbug

Last Reviewed: June 23, 1999