Vs 2019 MFC connects and accesses access database class library encapsulation through ace engine

         There are many codes on the Internet for reference , Most will be with #import "C:\Program Files\Common Files\System\ado\msado15.dll" no_namespace rename("EOF","adoEOF")rename("BOF","adoBOF") Xiang Guan's content . These class content pairs VS2019 Previous versions may be useful , But for VS2019 It doesn't help much .VS2019 Give up the old “stdafx.h” Precompiled header file , And switch to “PCH.h” The header file . Therefore, it took some time to solve the problem msado15.dll Dynamic link library import problem .

Encapsulating class libraries AdoControlAccess.h head file

#include<odbcinst.h>
#include<afxdb.h>
#import "C:\Program Files\Common Files\System\ado\msado15.dll" no_namespace rename("EOF","adoEOF")rename("BOF","adoBOF") 
class AdoControlAccess
{
public:
	_ConnectionPtr m_Connection;
	_RecordsetPtr  m_Recorderset;
	_CommandPtr    m_CommandSql;
	BOOL           m_OpenDataBaseOpened;
public:
	AdoControlAccess();
	virtual~AdoControlAccess();
public:
	_RecordsetPtr& GetRecordset(void);
	_RecordsetPtr& OpenRecordSet(CString CmdSql);
	void CloseConnectAndRecordset();
	void AdoConnectionInit(_bstr_t strConnection, _bstr_t UserID, _bstr_t PassWord, long OpenAccessMode);
};

  Encapsulating class libraries AdoControlAccess.CPP Implementation file

#include "pch.h"
#include "AdoControlAccess.h"

AdoControlAccess::AdoControlAccess()
{
	m_OpenDataBaseOpened = FALSE;
}

AdoControlAccess::~AdoControlAccess()
{

}

_RecordsetPtr& AdoControlAccess::GetRecordset(void)
{
	return m_Recorderset;
}

_RecordsetPtr& AdoControlAccess::OpenRecordSet(CString CmdSql)
{
	ASSERT(!CmdSql.IsEmpty());
	try
	{
		m_Recorderset.CreateInstance("ADODB.Recordset");
		if (m_Recorderset==NULL)
		{
			MessageBox(NULL, _T("RecordSet Object creation failed ! Please confirm whether it is initialized COM Environmental Science ."), _T(" message :"), MB_OK | MB_ICONERROR);
			printf("\n");
			printf("RecordSetRecordSet Object creation failed ! Please confirm whether it is initialized COM Environmental Science ！");
		}
		else
		{
			m_Recorderset->CursorLocation = adUseClient;
			m_Recorderset->Open(_variant_t(CmdSql), m_Connection.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
			printf("\n");
			printf("RecordSet Object successfully created ！");
		}
	}
	catch (_com_error Error)
	{
		OutputDebugString(Error.Description());
		MessageBox(NULL, Error.Description(), _T(" message :"), MB_OK | MB_ICONERROR);
	}
	return m_Recorderset;
}

void AdoControlAccess::CloseConnectAndRecordset()
{

	if (m_Connection->State)
	{
		if (m_Recorderset != NULL)
		{
			m_Recorderset->Close();
			m_Recorderset = NULL;
		}
		m_Connection->Close();
		m_Connection = NULL;
	}
}

void AdoControlAccess::AdoConnectionInit(_bstr_t strConnection,_bstr_t UserID,_bstr_t PassWord,long OpenAccessMode)
{
	/*OpenAccessMode*/
	/*adModeUnknown:
	adModeRead :		   read-only 
	adModeWrite :		   Just write 
	adModeReadWrite :	   Can read and write 
	adModeShareDenyRead  : Block others Connection Object to open the connection with read permission 
	adModeShareDenyWrite : Block others Connection Object to open the connection with write permission 
	adModeShareExclusive : Block others Connection Object to open the connection 
	adModeShareDenyNone  : Allow other programs or objects to connect with any permission */
	
	long nI = ::CoInitialize(NULL);
	try
	{
		m_Connection.CreateInstance("ADODB.Connection");
		m_Connection->ConnectionTimeout=5;
		m_Connection->Open(strConnection, UserID, PassWord, OpenAccessMode);
		m_OpenDataBaseOpened = TRUE;
		printf("\n");
		printf(" Successfully connected to Access database ！");
	}
	catch (_com_error Error)
	{
		OutputDebugString(Error.Description());
		MessageBox(NULL,Error.Description(),_T(" message :"),MB_OK|MB_ICONERROR);
		m_OpenDataBaseOpened = FALSE;
	}

}

  Application instructions ： Application header file

#include"MacroDefinition.h"
#include"CMyStatic.h"
#include"CEditJF.h"
#include"CMyButton.h"
#include"ToolBarEx.h"
#include"AdoControlAccess.h"
#include"UserDataModifyDlg.h"
#pragma once
#define WM_USERDLG_SHUNTDOWN  WM_USER+102
class CUserLogonDlg : public CDialogEx
{
	DECLARE_DYNAMIC(CUserLogonDlg)

public:
	CUserLogonDlg(CWnd* pParent = nullptr);  
	virtual ~CUserLogonDlg();
	CWnd* m_Parent;

#ifdef AFX_DESIGN_TIME
	enum { IDD = IDD_DIALOGUSERLOGON };
#endif

protected:
	virtual void DoDataExchange(CDataExchange* pDX);   
	void	  DrawTitleBar(CDC* pDC);
	DECLARE_MESSAGE_MAP()
public:
	CRect		m_rtButtExit;
	BOOL		m_bCloseShow;
	afx_msg		void OnClose();
	virtual		BOOL OnInitDialog();
	afx_msg		HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
	virtual		LRESULT DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam);
	afx_msg		LRESULT OnNcHitTest(CPoint point);
	afx_msg		void OnNcLButtonDown(UINT nHitTest, CPoint point);
	afx_msg		void OnNcMouseMove(UINT nHitTest, CPoint point);
	afx_msg     void OpenAccessDataBase();
	afx_msg     void CloseAccessDataBaseAndRecorderset();
	afx_msg     void OnReadAdministratorInfo();
	afx_msg     void ModifyDataBaseRecordset(CString preModifyUserName,CString preModifyUserPwd,CString preModifyUserType);
	afx_msg     void AddNewRecordset(CString strUserName, CString strPwd, CString strUserType);
	afx_msg     void ErgodicAllUserInfo(CString InputUser, CString InputUserPwd, CString InputUserType);
	CEditJF		m_UserLogonName;
	CEditJF		m_UserLogonPassWord;
	CMyStatic	m_UserLogonDlgTitle;
	CMyButton	m_LogonMakeSure;
	CMyButton	m_UserLogOut;
	CMyButton   m_AddUser;
	CMyButton   m_UserModify;
	CComboBoxXI m_LogonUserType;
	CImageList  m_LogonUserTypeImgList;
	AdoControlAccess m_CUserDataBase;
	_RecordsetPtr    UserTableRecordset;
	UserDataModifyDlg *m_CuserModifyDlg;
	 struct AdministratorInfo
	{
		CString AdName;
		CString AdPwd;
		CString AdType;
	}AdminUser,PreLogonUser,TemUser,CurrentUser,UserWillBeModify, UpdateUserModifyByNewUser;
	 afx_msg void OnBnClickedButtonlogon();
	 afx_msg void OnBnClickedButtonlogonout();
	 afx_msg void OnBnClickedButtonadduser();
	 afx_msg void OnBnClickedButtonmodifyuser();
protected:
	afx_msg LRESULT OnUsermodifydlgClose(WPARAM wParam, LPARAM lParam);
	afx_msg LRESULT OnUsermodifyUpdatedatabase(WPARAM wParam, LPARAM lParam);
};

 

Connection instructions ： Access The default connection user name of the database is Admin

                    password = The access password set when the database is created

m_CUserDataBase.AdoConnectionInit("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=./User/UserDataBase.accdb;Persist Security Info=False;User ID=Admin;Jet OLEDB:Database Password=  password ", "", "", adModeUnknown);

        VS2019 All cancelled SQL Database and Access Connection wizard for database connection , The database connection tool is reserved . The database connection tool is in the software interface " Tools "->“ Connect to database ” You can find . As shown in the figure below . Including the connection string can also be viewed through the software .

 

                              

 

 

 

Data query （CUserLogonDlg For application classes ）

void CUserLogonDlg::OnReadAdministratorInfo()
{
	OpenAccessDataBase();
	if (m_CUserDataBase.m_OpenDataBaseOpened==TRUE)
	{
		UserTableRecordset = m_CUserDataBase.GetRecordset();
		UserTableRecordset = m_CUserDataBase.OpenRecordSet(_T("SELECT UserTable.[UserName], UserTable.[UserPassWord], UserTable.[UserType] FROM UserTable where UserType=' Administrators '"));
		if (UserTableRecordset->RecordCount > 0)
		{
			UserTableRecordset->MoveFirst();
			AdminUser.AdName = UserTableRecordset->GetCollect("UserName");
			AdminUser.AdPwd  = UserTableRecordset->GetCollect("UserPassWord");
			AdminUser.AdType = UserTableRecordset->GetCollect("UserType");
			printf("\n");
			printf(" Successfully obtained the administrator account ！");
			CloseAccessDataBaseAndRecorderset();
		}
		else
		{
			printf("\n");
			printf(" No information related to the administrator account was found ！");
		}
	}
}

Data update

void CUserLogonDlg::ModifyDataBaseRecordset(CString preModifyUserName, CString preModifyUserPwd, CString preModifyUserType)
{
	CString  SqlCmd = _T("SELECT UserTable.[UserName], UserTable.[UserPassWord], UserTable.[UserType] FROM UserTable Where UserName=");
	SqlCmd = SqlCmd + _T("'") + preModifyUserName+_T("'") ;
	SqlCmd = SqlCmd + _T(" And ") + _T("UserPassWord=") + _T("'") + preModifyUserPwd + _T("'");
	SqlCmd = SqlCmd + _T(" And ") + _T("UserType=") + _T("'") + preModifyUserType + _T("'");

	OpenAccessDataBase();
		if (m_CUserDataBase.m_OpenDataBaseOpened == TRUE)
		{
			UserTableRecordset = m_CUserDataBase.GetRecordset();
			UserTableRecordset = m_CUserDataBase.OpenRecordSet(SqlCmd);
			if (UserTableRecordset->RecordCount > 0)
			{
				UserTableRecordset->PutCollect("UserName", _variant_t(UpdateUserModifyByNewUser.AdName));
				UserTableRecordset->PutCollect("UserPassWord", _variant_t(UpdateUserModifyByNewUser.AdPwd));
				UserTableRecordset->PutCollect("UserType", _variant_t(UpdateUserModifyByNewUser.AdType));
				UserTableRecordset->Update();

				MessageBox(_T(" The currently modified user data has been modified successfully ！."), _T(" message :"), MB_OK | MB_ICONINFORMATION);
				printf("\n");
				printf(" The currently modified user data has been modified successfully .");
			}
			else
			{
				MessageBox(_T(" The database finds that the current user to be modified does not exist ！ Please confirm and try again ."), _T(" message :"), MB_OK | MB_ICONINFORMATION);
				printf("\n");
				printf(" The database finds that the current user to be modified does not exist ！ Please confirm and try again .");
			}
			CloseAccessDataBaseAndRecorderset();
		}
}

  Data addition

void CUserLogonDlg::AddNewRecordset(CString strUserName,CString strPwd,CString strUserType)
{
	if (strUserName == _T("") || strPwd == _T("") || strUserType == _T(""))
	{
		MessageBox(_T(" User name or password or user type input cannot be empty ！ Please confirm and try again ."), _T(" message :"), MB_OK | MB_ICONINFORMATION);
		printf("\n");
		printf(" User name or password or user type input cannot be empty ！ Please confirm and try again .");
		return;
	}
	else
	{
		OpenAccessDataBase();
		if (m_CUserDataBase.m_OpenDataBaseOpened == TRUE)
		{
			UserTableRecordset = m_CUserDataBase.GetRecordset();
			UserTableRecordset = m_CUserDataBase.OpenRecordSet(_T("SELECT UserTable.[UserName], UserTable.[UserPassWord], UserTable.[UserType] FROM UserTable"));
			if (UserTableRecordset->RecordCount > 0)
			{
				UserTableRecordset->MoveFirst();
				for (int nCount = 0; nCount < UserTableRecordset->RecordCount; nCount++)
				{
					TemUser.AdName = UserTableRecordset->GetCollect("UserName");
					if (TemUser.AdName== strUserName)
					{
						MessageBox(_T(" The user to be added already exists ！ Please confirm and try again ."), _T(" message :"), MB_OK | MB_ICONINFORMATION);
						printf("\n");
						printf(" The user to be added already exists ！ Please confirm and try again .");
						break;
					}
					else if (strUserType == _T(" Administrators "))
					{
						MessageBox(_T(" Unable to add administrator account , Please select the correct user type ."), _T(" message :"), MB_OK | MB_ICONINFORMATION);
						printf("\n");
						printf(" Unable to add administrator account , Please select the correct user type .");
						break;
					}
					else if (TemUser.AdName != strUserName&& strUserType != _T(" Administrators "))
					{
						UserTableRecordset->MoveNext();
					}
					if (UserTableRecordset->adoEOF)
					{
						if (TemUser.AdName != strUserName && strUserType != _T(" Administrators "))
						{
							UserTableRecordset->MoveLast();
							UserTableRecordset->AddNew();
							UserTableRecordset->PutCollect("UserName", _variant_t(strUserName));
							UserTableRecordset->PutCollect("UserPassWord", _variant_t(strPwd));
							UserTableRecordset->PutCollect("UserType", _variant_t(strUserType));
							UserTableRecordset->Update();
							UserTableRecordset->MoveFirst();
							MessageBox(_T(" The new user has been successfully added to the user management database ！"), _T(" message :"), MB_OK | MB_ICONINFORMATION);
							printf("\n");
							printf(" User added successfully ！");
							break;
						}
					}
				}
				CloseAccessDataBaseAndRecorderset();
			}
		}
	}
	TemUser.AdName = _T("");
	TemUser.AdPwd  = _T("");
	TemUser.AdType = _T("");
}