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Data from MS SQL table to MFC Combobox(Drop list) mode via OLE DB (Compiler: MS Visual C++ 6)

Posted on 2004-08-25
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Last Modified: 2013-11-25
I am trying to get data from a table on a SQL server ( Departments ) and put into a ComboBox using a OLE DB connection set up by a ATL object. I have by now not been able to find any help anywhere.
The ComboBox is being used in a Dialogbased MFC Application, i have added a Document object decending from CDocument to save the data into.
I really hope somebody can help me out..

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Question by:syska
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nabehs earned 250 total points
ID: 11900093
1. In Class View, Right Click, New Class. From the Dialog Combo, select Generic Class, Enter the name CDepartments and press OK. A new class is created with departments.cpp and departments.h files
2. Open departments.h file
3. Assume that you have the table Departments with the following fields
department_id : varchar(10)
department_name : varchar(100)
4. Modify the class CDepartments in departments.h to the following
class CDepartments
{
public:
    CDepartments();
    virtual ~CDepartments();

    CHAR m_szDeptId[11]; // always character array size + 1. So you have varchar(10): you will need CHAR [11]
    CHAR m_szDeptName[101];

BEGIN_COLUMN_MAP(CDepartments)
    COLUMN_ENTRY(1, m_szDeptId)
    COLUMN_ENTRY(2, m_szDeptName)
END_COLUMN_MAP( )
};

5. In stdafx.h add the following line:
#include <atldbcli.h>

6. Add the following function to fill the combo with the departments:

#include "departments.h"
void FillComboWithDepartments(CComboBox& combo);

void FillComboWithDepartments(CComboBox& combo)
{
    CoInitialize(NULL);

    CCommand<CAccessor<CDepartments> > rs;
    CString strConnectionString = "Provider=SQLOLEDB.1;Initial Catalog=MyDatabase;Data Source=MyServer;User Id=sa;Password=;";
    // Replace MyDatabase with your database name
    // Replace MyServer with the server name where SQL Server is installed
    // Replace sa with the user id
    // Replace the blank password with the correct password

    CDataSource ds;
    CSession session;
    HRESULT hr;

    // without error checking
    hr = ds.OpenFromInitializationString(strConnectionString.AllocSysString( ));
    hr = session.Open(ds);
    hr = rs.Open(session, "SELECT * FROM Departments ORDER BY department_name");
    while(rs.MoveNext( ) == S_OK)
    {
        combo.AddString(rs.m_szDeptName);
    }
    rs.Close( );
    session.Close( );
    ds.Close( );

    CoUninitialize( );
}

7. Call this function and pass the combobox reference


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