DateCreated and DateModified Properties Example (VC++)

This example demonstrates the DateCreated and DateModified properties by adding a new Column to an existing Table and by creating a new Table. The DateOutput procedure is required for this example to run.

// BeginDateCreatedCpp
#import "c:\Program Files\Common Files\system\ado\msadox.dll" \
    no_namespace
#import "c:\Program Files\Common Files\system\ado\msado15.dll"

#include "iostream.h"
#include "stdio.h"
#include "conio.h"

//Function declarations
inline void TESTHR(HRESULT x) {if FAILED(x) _com_issue_error(x);};
void DateCreatedX(void);
void DateOutPut(_bstr_t strTemp , _TablePtr tblTemp);

//////////////////////////////////////////////////////////
//                                                      //
//        Main Function                                 //
//                                                      //
//////////////////////////////////////////////////////////
void main()
{
    if(FAILED(::CoInitialize(NULL)))
        return;

    DateCreatedX();

    ::CoUninitialize();
}

//////////////////////////////////////////////////////////
//                                                      //
//       DateCreatedX Function                          //
//                                                      //
//////////////////////////////////////////////////////////
void DateCreatedX()
{
    HRESULT hr = S_OK;

    // Define ADOX object pointers.
    // Initialize pointers on define.
    // These are in the ADOX::  namespace.
    _CatalogPtr m_pCatalog = NULL;
    _TablePtr m_pTblEmployees = NULL;
    _TablePtr m_pTblNew = NULL;

    //Set ActiveConnection of Catalog to this string
    _bstr_t strCnn("Provider='Microsoft.JET.OLEDB.4.0';" 
        "Data Source= 'c:\\Program Files\\Microsoft Office\\"
        "Office\\Samples\\Northwind.mdb';");

    try
    {
        TESTHR(hr = m_pCatalog.CreateInstance(__uuidof (Catalog)));

        // Connect the catalog.
        m_pCatalog->PutActiveConnection(strCnn);

        m_pTblEmployees = m_pCatalog->Tables->GetItem("Employees");

        // Print current information about the Employees table.
        DateOutPut((_bstr_t)"Current properties", m_pTblEmployees);

        // Create and append column to the Employees table.
        m_pTblEmployees->Columns->Append("NewColumn", adInteger,0);

        m_pCatalog->Tables->Refresh();

        // Print new information about the Employees table.
        DateOutPut((_bstr_t)"After creating a new column", 
            m_pTblEmployees);

        // Delete new column because this is a demonstration.
        m_pTblEmployees->Columns->Delete("NewColumn");

        // Create and append new Table object to the Northwind database.
        TESTHR(hr = m_pTblNew.CreateInstance(__uuidof(Table)));

        m_pTblNew->Name = "NewTable";
        m_pTblNew->Columns->Append("NewColumn", adInteger,0);
        m_pCatalog->Tables->Append(_variant_t((IDispatch*)m_pTblNew));
        m_pCatalog->Tables->Refresh();

        //Print information about the new Table object.
        DateOutPut((_bstr_t)"After creating a new table", m_pCatalog->
            Tables->GetItem("NewTable"));

        // Delete new Table object because this is a demonstration.
        m_pCatalog->Tables->Delete(m_pTblNew->Name);
    }

    catch(_com_error &e)
    {
        // Notify the user of errors if any.
        _bstr_t bstrSource(e.Source());
        _bstr_t bstrDescription(e.Description());
          
        printf("\n\tSource :  %s \n\tdescription : %s \n ",
            (LPCSTR)bstrSource,(LPCSTR)bstrDescription);
    }

    catch(...)
    {
        cout << "Error occured in include files...."<< endl;
    }
}

//////////////////////////////////////////////////////////
//                                                      //
//        DateOutPut Function                           //
//                                                      //
//////////////////////////////////////////////////////////
void DateOutPut(_bstr_t strTemp , _TablePtr tblTemp)
{
    // Print DateCreated and DateModified information about
    // specified Table object.
    cout << strTemp << endl;
    cout << "    Table: " << tblTemp->GetName() << endl;
    cout << "        DateCreated = " << (_bstr_t)tblTemp->
        GetDateCreated() << endl;
    cout << "        DateModified = " << (_bstr_t)tblTemp->
        GetDateModified() << endl;
}
// EndDateCreatedCpp

See Also

Column Object | DateCreated Property | DateModified Property | Table Object