PRB: "Errors Occurred" Error When Calling Stored Procedure with More than a SELECT Statement

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Symptoms

When calling ICommand::Execute to execute a Microsoft SQL Server stored procedure using the Microsoft SQL Server OLE DB Provider, DB_E_ERRORSOCCURRED is returned and the IErrorInfo description information states "Errors Occurred."

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Cause

The stored procedure contains more than a simple SELECT statement. A client side cursor is required.

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Resolution

In order to resolve this, you will have to use client side cursors. There are two ways to use client side cursors:

For a forward only, read only client cursor, do not set rowset properties such as DBPROP_UPDATABILITY and DBPROP_IRowsetChange.
Use an updateable client-side cursor.

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Status

This behavior is by design (although Microsoft is investigating whether a more informative error message can be returned).

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More information

Here is an example of what the stored procedure might look like:

CREATE  procedure sp_Test
AS
    DECLARE @var int
    SET  @var = 1
    SELECT * FROM authors

Steps to Reproduce Behavior

To reproduce the error, create this sample stored procedure and then execute the following code:

#include <atldbcli.h>

class CTestAccessor
{
public:
	LONG m_RETURNVALUE;

BEGIN_PARAM_MAP(CTestAccessor)
	SET_PARAM_TYPE(DBPARAMIO_OUTPUT)
	COLUMN_ENTRY(1, m_RETURNVALUE)
END_PARAM_MAP()

DEFINE_COMMAND(CTestAccessor, _T("{ ? = CALL dbo.sp_Test}"))


};

class CTestCmd : public CCommand<CAccessor<CTestAccessor> >
{
public:
	HRESULT Open()
	{
		HRESULT		hr;

		hr = OpenDataSource();
		if (FAILED(hr))
			return hr;

		return OpenRowset();
	}
	HRESULT OpenDataSource()
	{
		HRESULT		hr;
		CDataSource db;
		CDBPropSet	dbinit(DBPROPSET_DBINIT);

		dbinit.AddProperty(DBPROP_AUTH_USERID, OLESTR("sa"));
		dbinit.AddProperty(DBPROP_INIT_CATALOG, OLESTR("pubs"));
		//change the name of SQL server to fit your environment
                dbinit.AddProperty(DBPROP_INIT_DATASOURCE, OLESTR("localhost"));
                dbinit.AddProperty(DBPROP_INIT_LCID, (long)1033);
		dbinit.AddProperty(DBPROP_INIT_PROMPT, (short)4);
		
		//Use this line if you want to use a forward only, read only client side cursor
		hr = db.Open(_T("SQLOLEDB.1"), &dbinit);
		
		//Use this line if you want to use an updateable client side cursor 
		//hr = db.OpenWithServiceComponents(_T("SQLOLEDB.1"), &dbinit); 
		
		if (FAILED(hr))
			return hr;

		return m_session.Open(db);
	}
	HRESULT OpenRowset()
	{
		// Set properties for open
		CDBPropSet	propset(DBPROPSET_ROWSET);
		
		//Remove the following properties to prevent the error with a forward only, read only client side cursor
		//Set them if you want an updateable client side cursor
		propset.AddProperty(DBPROP_IRowsetChange, true);
		propset.AddProperty(DBPROP_UPDATABILITY, DBPROPVAL_UP_CHANGE | DBPROPVAL_UP_INSERT | DBPROPVAL_UP_DELETE);
		
		//Set this property if you want to use an updateable client side cursor
		//propset.AddProperty(DBPROP_CLIENTCURSOR, true);

		return CCommand<CAccessor<CTestAccessor> >::Open(m_session, NULL, &propset);
	}
	CSession	m_session;
};

int main(int argc, char* argv[])
{
	CoInitialize(NULL);

	CTestCmd rs;
	HRESULT hr=rs.Open();
	if (FAILED(hr))
            AtlTraceErrorRecords();

	rs.Close();

	return 0;
}

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