AddNew Method Example (VC++)

This example uses the AddNew method to create a new record with the specified name.

// BeginAddNewCpp
#import "C:\Program Files\Common Files\System\ADO\msado15.dll" \
    no_namespace rename("EOF", "EndOfFile")


#include <ole2.h>
#include <stdio.h>
#include "conio.h"
#include "AddNewX.h"

//Function declaration
inline void TESTHR(HRESULT x) {if FAILED(x) _com_issue_error(x);};
void AddNewX(VOID);
void PrintProviderError(_ConnectionPtr pConnection);

///////////////////////////////////////////////////////////
//                                                       //
//      Main Function                                    //
//                                                       //
///////////////////////////////////////////////////////////
void main()
{
   HRESULT  hr = S_OK;

   if(FAILED(::CoInitialize(NULL))) 
      return; 

   if (SUCCEEDED(hr))
   {
       AddNewX();

      //Wait here for the user to see the output
      printf("Press any key to continue...");
      getch();

       ::CoUninitialize();
   }
}


///////////////////////////////////////////////////////////
//                                                       //
//      AddNewX Function                                 //
//                                                       //
///////////////////////////////////////////////////////////
VOID  AddNewX(VOID)
{

   // Define ADO object pointers.
    // Initialize pointers on define.
   _RecordsetPtr pRstEmployees = NULL;
   _ConnectionPtr pConnection  = NULL;

   //Define Other variables
   IADORecordBinding   *picRs = NULL;  //Interface Pointer declared.(VC++ Extensions)   
   CEmployeeRs emprs;    //C++ class object   

   HRESULT hr = S_OK;

                           //Replace Data Source value with your server name.
   _bstr_t strCnn("Provider=sqloledb;Data Source=MyServer;Initial Catalog=pubs;User Id=sa;Password=;");
   _bstr_t strId;
    _bstr_t strMessage;
   
   try
   {
      //Open a connection
      TESTHR(pConnection.CreateInstance(__uuidof(Connection)));
      pConnection->Open(strCnn,"","",adConnectUnspecified);
      

      //Open employee table 
      TESTHR(pRstEmployees.CreateInstance(__uuidof(Recordset)));

      //You have to explicitly pass the Cursor type and LockType to the Recordset here
      pRstEmployees->Open("employee",_variant_t((IDispatch *) pConnection, true),adOpenKeyset,adLockOptimistic,adCmdTable);
      

      //Open an IADORecordBinding interface pointer which we'll use for Binding Recordset to a class    
      TESTHR(pRstEmployees->QueryInterface(__uuidof(IADORecordBinding),(LPVOID*)&picRs));


       //Bind the Recordset to a C++ Class here   
      TESTHR(picRs->BindToRecordset(&emprs));       

      // Get data from the user.The employee id must be formatted as
      // first,middle and last initial,five numbers,then M or F to
      // signify the gender.For example,the employee id for 
      // Bill A. Sorensen would be "BAS55555M". 
          
      printf("Enter Employee Id: ");scanf("%s",emprs.m_sz_empid);
      strId = emprs.m_sz_empid;
      printf("Enter First Name: ");scanf("%s",emprs.m_sz_fname);
      printf("Enter Last Name:");scanf("%s",emprs.m_sz_lname);

      //Proceed if the user actually entered some thing  
      //for the id, the first and the last name. 
       
      if(strcmp(emprs.m_sz_empid,"")  && strcmp(emprs.m_sz_fname,"") && strcmp(emprs.m_sz_lname,""))
      {
         //This adds a new record to the table   
             //if (FAILED(hr = picRs->AddNew(&emprs)))
            //_com_issue_error(hr);
            TESTHR(picRs->AddNew(&emprs));
      
            //Show the newly added data
             printf("New Record: %s  %s  %s \n",\
               emprs.lemp_empidStatus == adFldOK ? emprs.m_sz_empid : "<NULL>",\
               emprs.lemp_fnameStatus == adFldOK ? emprs.m_sz_fname : "<NULL>",\
               emprs.lemp_lnameStatus == adFldOK ? emprs.m_sz_lname : "<NULL>");
      }
      else
         printf("Please enter an employee id, first name and last name.\n");   
       
         
      
      //Delete the new record because this is a demonstration. 
      pConnection->Execute("DELETE FROM EMPLOYEE WHERE emp_id = '"+strId+"'",NULL,adCmdText);

      
      //Release the IADORecordset Interface here   
      if (picRs)
      picRs->Release();

      // Clean up objects before exit.
      pRstEmployees->Close();
      pConnection->Close(); 

   }


   catch(_com_error &e)
   {
      // Notify the user of errors if any.
      _variant_t vtConnect = pRstEmployees->GetActiveConnection();

      // GetActiveConnection returns connect string if connection
      // is not open, else returns Connection object.
      switch(vtConnect.vt)
      {
      case VT_BSTR:
            printf("Error:\n");
            printf("Code = %08lx\n", e.Error());
            printf("Message = %s\n", e.ErrorMessage());
            printf("Source = %s\n", (LPCSTR) e.Source());
            printf("Description = %s\n", (LPCSTR) e.Description());
            break;
      case VT_DISPATCH:
            PrintProviderError(vtConnect);
            break;
      default:
            printf("Errors occured.");
            break;
      }

   }


}


///////////////////////////////////////////////////////////
//                                                       //
//      PrintProviderError Function                      //
//                                                       //
///////////////////////////////////////////////////////////

VOID PrintProviderError(_ConnectionPtr pConnection)
{
   // Print Provider Errors from Connection object.
   // pErr is a record object in the Connection's Error collection.
   ErrorPtr  pErr = NULL;
   long      nCount = 0;    
   long      i = 0;

   if( (pConnection->Errors->Count) > 0)
   {
      nCount = pConnection->Errors->Count;
      // Collection ranges from 0 to nCount -1.
      for(i = 0; i < nCount; i++)
      {
         pErr = pConnection->Errors->GetItem(i);
         printf("\n\t Error number: %x\t%s", pErr->Number, (LPCSTR)pErr->Description);
      }
   }
}
// EndAddNewCpp

AddNewX.h:

// BeginAddNewH
#include "icrsint.h"


//This Class extracts empid, fname and lastname  

class CEmployeeRs : public CADORecordBinding
{
BEGIN_ADO_BINDING(CEmployeeRs)
    
   //Column empid is the 1st field in the recordset   

   ADO_VARIABLE_LENGTH_ENTRY2(1, adVarChar, m_sz_empid, 
         sizeof(m_sz_empid), lemp_empidStatus, TRUE)

   ADO_VARIABLE_LENGTH_ENTRY2(2, adVarChar, m_sz_fname, 
         sizeof(m_sz_fname), lemp_fnameStatus, TRUE)

   ADO_VARIABLE_LENGTH_ENTRY2(4, adVarChar, m_sz_lname, 
         sizeof(m_sz_lname), lemp_lnameStatus, TRUE)
   
END_ADO_BINDING()

public:

   CHAR  m_sz_empid[10];
   ULONG lemp_empidStatus;
   CHAR   m_sz_fname[40];
   ULONG  lemp_fnameStatus;
   CHAR   m_sz_lname[41];
   ULONG  lemp_lnameStatus;

};
// EndAddNewH

AddNew Method Example (VC++)

See Also