openx.cpp

来自「visual c++ 很全的ado的sample」· C++ 代码 · 共 191 行

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

#include <oledb.h>
#include <stdio.h>
#include <conio.h>
#include "OpenX.h"

// Function declarations
inline void TESTHR(HRESULT x) {if FAILED(x) _com_issue_error(x);};
void OpenX(void);
void PrintProviderError(_ConnectionPtr pConnection);
void PrintComError(_com_error &e);

///////////////////////////////////////////////////////////
//                                                       //
//      Main Function                                    //
//                                                       //
///////////////////////////////////////////////////////////

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

    OpenX();

    ::CoUninitialize();
}

///////////////////////////////////////////////////////////
//                                                       //
//               OpenX Function                          //
//                                                       //
///////////////////////////////////////////////////////////

void OpenX(void)
{
    // Define ADO object pointers.
    // Initialize pointers on define.
    // These are in the ADODB::  namespace
     _RecordsetPtr    pRstEmployee  = NULL;
     _ConnectionPtr pConnection    = NULL;

    // Define string variables.
    _bstr_t strCnn("Provider=sqloledb;Data Source=srv;"
        "Initial Catalog=pubs;User Id=sa;Password=;");

    // Define Other Variables.
    HRESULT  hr = S_OK;
    IADORecordBinding   *picRs  = NULL;  // Interface Pointer declared.
    CEmployeeRs emprs;       // C++ Class object
    DBDATE varDate;

    try
    {
        // open connection and record set
        TESTHR(pConnection.CreateInstance(__uuidof(Connection)));
        pConnection->Open(strCnn,"","",NULL);

        TESTHR(pRstEmployee.CreateInstance(__uuidof(Recordset)));
        pRstEmployee->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(pRstEmployee->QueryInterface(
            __uuidof(IADORecordBinding),(LPVOID*)&picRs));

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

        // Assign the first employee record's hire date
        // to a variable, then change the hire date.
        varDate = emprs.m_sze_hiredate;
        printf("\nOriginal data\n");
        printf("\tName - Hire Date\n");
        printf("  %s  %s - %d/%d/%d\n\n",
            emprs.le_fnameStatus == adFldOK ? 
            emprs.m_sze_fname : "<NULL>",
            emprs.le_lnameStatus == adFldOK ? 
            emprs.m_sze_lname : "<NULL>",
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.month : 0,
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.day : 0,
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.year : 0); 

        emprs.m_sze_hiredate.year=1900;
        emprs.m_sze_hiredate.month=1;
        emprs.m_sze_hiredate.day=1;
        picRs->Update(&emprs);

        printf("\nChanged data\n");
        printf("\tName - Hire Date\n");
        printf("  %s %s - %d/%d/%d\n\n",
            emprs.le_fnameStatus == adFldOK ? 
            emprs.m_sze_fname : "<NULL>",
            emprs.le_lnameStatus == adFldOK ? 
            emprs.m_sze_lname : "<NULL>",
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.month : 0,
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.day : 0,
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.year : 0); 

        // Requery Recordset and reset the hire date.
        pRstEmployee->Requery(adOptionUnspecified);
        // Open an IADORecordBinding interface pointer which we'll 
        // use for Binding Recordset to a class.
        TESTHR(pRstEmployee->QueryInterface(
            __uuidof(IADORecordBinding),(LPVOID*)&picRs));

        // Rebind the Recordset to a C++ Class here.
        TESTHR(picRs->BindToRecordset(&emprs));
        emprs.m_sze_hiredate = varDate;
        picRs->Update(&emprs);
        printf("\nData after reset\n");
        printf("\tName - Hire Date\n");
        printf("  %s %s - %d/%d/%d",emprs.le_fnameStatus == adFldOK ? 
            emprs.m_sze_fname : "<NULL>",
            emprs.le_lnameStatus == adFldOK ? 
            emprs.m_sze_lname : "<NULL>",
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.month : 0,
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.day : 0,
            emprs.le_hiredateStatus == adFldOK ? 
            emprs.m_sze_hiredate.year : 0); 

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

    catch(_com_error &e)
    {
        // Notify the user of errors if any.
        // Pass a connection pointer accessed from the Connection.
        PrintProviderError(pConnection);
        PrintComError(e);
    }
}

///////////////////////////////////////////////////////////
//                                                       //
//      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;

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

///////////////////////////////////////////////////////////
//                                                       //
//      PrintComError Function                           //
//                                                       //
///////////////////////////////////////////////////////////

void PrintComError(_com_error &e)
{
   _bstr_t bstrSource(e.Source());
   _bstr_t bstrDescription(e.Description());

    // Print COM errors. 
   printf("Error\n");
   printf("\tCode = %08lx\n", e.Error());
   printf("\tCode meaning = %s\n", e.ErrorMessage());
   printf("\tSource = %s\n", (LPCSTR) bstrSource);
   printf("\tDescription = %s\n", (LPCSTR) bstrDescription);
}