VC++ ADO实现三层架构
ADO底层实现
头文件
// ADOConn.h: interface for the ADOConn class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_ADOCONN_H__B8D01B34_20DA_49AE_9FA1_664D67A28ABD__INCLUDED_)
#define AFX_ADOCONN_H__B8D01B34_20DA_49AE_9FA1_664D67A28ABD__INCLUDED_
#import "c:\Program Files\Common Files\System\ado\msado15.dll" no_namespace rename("EOF","adoEOF")rename("BOF","adoBOF")
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class ADOConn
{
public:
//添加一个指向Connection对象的指针
_ConnectionPtr m_pConnection;
//添加一个指向Recordset对象的指针
_RecordsetPtr m_pRecordset;
public:
ADOConn();
virtual ~ADOConn();
//初始化--连接数据库
void OnInitADOConn();
//执行查询
_RecordsetPtr& GetRecordSet(_bstr_t bstrSQL);
//执行SQL语句
BOOL ExecuteSQL(_bstr_t bstrSQL);
//断开数据库连接
void ExitConnect();
};
#endif // !defined(AFX_ADOCONN_H__B8D01B34_20DA_49AE_9FA1_664D67A28ABD__INCLUDED_)
源文件
// ADOConn.cpp: implementation of the ADOConn class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "WordGLXT.h"
#include "ADOConn.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
ADOConn::ADOConn()
{
}
ADOConn::~ADOConn()
{
}
void ADOConn::OnInitADOConn()
{
//初始化OLE/COM库环境
::CoInitialize(NULL);
try
{
//创建connection对象
//下面语句等效于：m_pConnection.CreateInstance("ADODB.Connection");
m_pConnection.CreateInstance(__uuidof(Connection));
//设置连接字符串
_bstr_t strConnect="Provider=SQLOLEDB.1;Integrated Security=SSPI;\
Persist Security Info=False;Initial Catalog=WenDGL;Data Source=.\\";
//SERVER和UID,PWD的设置根据实际情况来设置
m_pConnection->Open(strConnect,"","",adModeUnknown);
}
//捕捉异常
catch(_com_error e)
{
//显示错误信息
AfxMessageBox(e.Description());
}
}
_RecordsetPtr& ADOConn::GetRecordSet(_bstr_t bstrSQL)
{
try
{
//连接数据库，如果connection对象为空，则重新连接数据库
if(m_pConnection==NULL)
OnInitADOConn();
//创建记录集对象
//m_pRecordset.CreateInstance(__uuidof(Recordset));
m_pRecordset.CreateInstance("ADODB.Recordset");
//取得表中的记录
m_pRecordset->Open(bstrSQL,m_pConnection.GetInterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);
}
catch(_com_error e)
{
e.Description();
}
//返回记录集
return m_pRecordset;
}
BOOL ADOConn::ExecuteSQL(_bstr_t bstrSQL)
{
_variant_t RecordsAffected;
try
{
//是否已连接数据库
if(m_pConnection==NULL)
OnInitADOConn();
/***********************************************************************
* connection对象的Execute方法说明如下： *
* Execute(_bstr_t CommandText,VARIANT * RecordsAffected,long Options) *
* 其中CommandText是命令字符串,通常是SQL命令 *
* 参数RecordsAffected是操作完成后所影响的行数 *
* 参数Options表示CommandText的类型。 *
* adCmdText-文本命令 *
* adCmdTable-表名 *
* adCmdProc-存储过程 *
* adCmdUnknown-未知 *
***********************************************************************/
m_pConnection->Execute(bstrSQL,NULL,adCmdText); //执行SQL语句
return true;
}
catch(_com_error e)
{
e.Description();
return false;
}
}
void ADOConn::ExitConnect()
{
//关闭记录集和连接
if(m_pRecordset!=NULL)
m_pRecordset->Close();
m_pConnection->Close();
//释放环境
::CoUninitialize();
}
CUsers业务逻辑层
此处以常见的用户登录为例，头文件
// Users.h: interface for the CUsers class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_USERS_H__7AB8B197_FAD4_4C75_B32B_40F799B5A97F__INCLUDED_)
#define AFX_USERS_H__7AB8B197_FAD4_4C75_B32B_40F799B5A97F__INCLUDED_
#include "ADOConn.h"
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class CUsers
{
private:
CString Username;
CString Pwd;
CString JB;
public:
CUsers();
virtual ~CUsers();
CString GetUsername();
void SetUsername(CString cUsername);
CString GetPwd();
void SetPwd(CString cPwd);
CString GetJB();
void SetJB(CString cJB);
void sql_insert();
void sql_update(CString cUsername);
void sql_delete(CString cUsername);
void sql_updatepwd(CString cUsername);
int Havename(CString cUsername);
int HaveCzy(CString cUsername,CString cPwd);
int HaveCzyjb(CString cUsername,CString cPwd,CString cJB);
};
#endif // !defined(AFX_USERS_H__7AB8B197_FAD4_4C75_B32B_40F799B5A97F__INCLUDED_)
源文件
// Users.cpp: implementation of the CUsers class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "WordGLXT.h"
#include "Users.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CUsers::CUsers()
{
}
CUsers::~CUsers()
{
}
CString CUsers::GetUsername()
{
return Username;
}
void CUsers::SetUsername(CString cUsername)
{
Username=cUsername;
}
CString CUsers::GetPwd()
{
return Pwd;
}
void CUsers::SetPwd(CString cPwd)
{
Pwd=cPwd;
}
CString CUsers::GetJB()
{
return JB;
}
void CUsers::SetJB(CString cJB)
{
JB=cJB;
}
void CUsers::sql_insert()
{
ADOConn m_AdoConn;
_bstr_t vSQL;
vSQL="insert into Users(Username,Pwd,JB)values('"+Username+"','"+Pwd+"','"+JB+"')";
m_AdoConn.ExecuteSQL(vSQL);
m_AdoConn.ExitConnect();
}
void CUsers::sql_update(CString cUsername)
{
ADOConn m_AdoConn;
_bstr_t vSQL;
vSQL="update Users set Pwd='"+Pwd+"',JB='"+JB+"' where Username="+" "+cUsername+"'";
m_AdoConn.ExecuteSQL(vSQL);
m_AdoConn.ExitConnect();
}
void CUsers::sql_delete(CString cUsername)
{
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
CString sql;
sql.Format("delete from Users where Username='%s'",cUsername);
m_AdoConn.ExecuteSQL((_bstr_t)sql);
m_AdoConn.ExitConnect();
}
int CUsers::Havename(CString cUsername)
{
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
CString sql;
sql.Format("SELECT*FROM Users WHERE Username='%s'",cUsername);
_RecordsetPtr m_pRecordset;
m_pRecordset=m_AdoConn.GetRecordSet((_bstr_t)sql);
if(m_pRecordset->adoEOF)
return -1;
else
return 1;
m_AdoConn.ExitConnect();
}
int CUsers::HaveCzy(CString cUsername,CString cPwd)
{
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
CString sql;
sql.Format("SELECT*FROM Users WHERE Username='%s' AND Pwd='%s'",cUsername,cPwd);
_RecordsetPtr m_pRecordset;
m_pRecordset=m_AdoConn.GetRecordSet((_bstr_t)sql);
if(m_pRecordset->adoEOF)
return -1;
else
return 1;
m_AdoConn.ExitConnect();
}
int CUsers::HaveCzyjb(CString cUsername,CString cPwd,CString cJB)
{
ADOConn m_AdoConn;
m_AdoConn.OnInitADOConn();
CString sql;
sql.Format("SELECT*FROM Users WHERE Username='%s' AND Pwd='%s' AND JB='%s'",cUsername,cPwd,cJB);
_RecordsetPtr m_pRecordset;
m_pRecordset=m_AdoConn.GetRecordSet((_bstr_t)sql);
if(m_pRecordset->adoEOF)
return -1;
else
return 1;
m_AdoConn.ExitConnect();
}
void CUsers::sql_updatepwd(CString cUsername)
{
ADOConn m_AdoConn;
_bstr_t vSQL;
vSQL="UPDATE Users SET Pwd='"+Pwd+"' WHERE Username="+" '"+cUsername+"'";
m_AdoConn.ExecuteSQL(vSQL);
m_AdoConn.ExitConnect();
}
登录按钮
void CDialogin::OnBnClickedOk()
{
//将对话框中编辑框的数据读取到成员变量中
UpdateData(true);
//检查数据有效性
CString strName;
GetDlgItem(IDC_EDIT_Name)->GetWindowText(strName);
CString strPwd;
GetDlgItem(IDC_EDIT_PWD)->GetWindowText(strPwd);
if (strName == "")
{
MessageBox("用户名或密码错误!","文档管理系统");
return;
}
//如果读取数据和用户输入不同，则返回
if(user.HaveCzy(strName,strPwd) != 1)
{
MessageBox("用户名或密码错误!","文档管理系统");
return;
}
OnOK();
}