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HomeDatabaseMysql TutorialVC下利用ADO访问Access数据库(Use ADO)(转载)

VC下利用ADO直接访问Access数据库步骤不需要用户建立ODBC数据源) 1.包含相关动态链接库 //在StdAfx.h中,最后部分添加(注意:一定要在最后部分,否则会编译出错) #import c:/Program Files/Common Files/System/ado/msado15.dll no_namespace rename(EOF,adoEO

VC下利用ADO直接访问Access数据库步骤不需要用户建立ODBC数据源)

1.包含相关动态链接库

  1. //在StdAfx.h中,最后部分添加(注意:一定要在最后部分,否则会编译出错)

  2. #import "c:/Program Files/Common Files/System/ado/msado15.dll" no_namespace rename("EOF","adoEOF")


2.连接的创建与初始化

  1. //相关成员变量

  2. _ConnectionPtr m_conn;

  3. _RecordsetPtr m_res;

  4.  

  5. //成员函数块(一般写在CDocment类构造函数即可)

  6. try

  7. {

  8.         CoInitialize(NULL);

  9.         m_conn.CreateInstance(_uuidof(Connection));

  10.         CString strFileName;

  11.         strFileName = "MYBASE.mdb";     //添加相应你的数据库的文件名,编辑状态应放在源文件目录下

  12.         m_conn->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strFileName,

  13.                 "","",adConnectUnspecified);            //用户名,密码

  14.         m_res.CreateInstance(_uuidof(Recordset));

  15. }

  16. catch(_com_error e)     //异常检测

  17. {

  18.         AfxMessageBox("数据库连接错误!",MB_ICONEXCLAMATION);

  19.         exit(0);        //错误,程序退出

  20. }


3.数据库相关操作(操作方法很多,这里只提供一种简易操作)
假设数据库表设计如下:
表名: MYTABLE
表设计:
自动编号类型 ID
字符串类型 NAME
BOOL类型 SEX

(1)增

  1. _variant_t m_resa;      //可声明为成员变量

  2.  

  3. CString strMyName = "MyName";

  4. CString strSex = "true";

  5.  

  6. CString sql;

  7. sql = "insert into MYTABLE (NAME,SEX) ";

  8. sql += "values ('" + strMyName +"',";

  9. sql += " " + strSex + " ";

  10. sql += ")";

  11.  

  12. try

  13. {

  14.         m_conn->Execute((_bstr_t)sql,&m_resa,adCmdText);        //执行"增"操作

  15. }

  16. catch(_com_error e)

  17. {

  18.         AfxMessageBox("数据库增错误",MB_ICONEXCLAMATION);

  19.         exit(0);        //错误,程序退出

  20. }


(2)删

  1. _variant_t m_resa;      //可声明为成员变量

  2.  

  3. CString strID = "1";    //所要删除记录的ID号

  4. CString sql;

  5.  

  6. sql = "delete from MYTABLE ";   //注意需要有空格

  7. sql += "where ID = " + strID;   //其他语法详查SQL语句

  8.  

  9. try

  10. {

  11.         m_conn->Execute((_bstr_t)sql,&m_resa,adCmdText);        //执行"增"操作

  12. }

  13. catch(_com_error e)

  14. {

  15.         AfxMessageBox("数据库删错误",MB_ICONEXCLAMATION);

  16.         exit(0);        //错误,程序退出

  17. }


(3)改

  1. _variant_t m_resa;      //可声明为成员变量

  2.  

  3. CString sql;

  4. CString strMyName = "MyName";

  5. CString strSex = "true";

  6. CString strID = "1";    //所要更新的记录ID

  7.  

  8. sql = "update MYTABLE set ";

  9. sql += "NAME = '" + strMyName +"', ";

  10. sql += "SEX = " + strSex + " ";

  11. sql += "where id = " + strID;

  12.  

  13. try

  14. {

  15.         m_conn->Execute((_bstr_t)sql,&m_resa,adCmdText);        //执行"增"操作

  16. }

  17. catch(_com_error e)

  18. {

  19.         AfxMessageBox("数据库删错误",MB_ICONEXCLAMATION);

  20.         exit(0);        //错误,程序退出

  21. }


(4)查

  1. _variant_t m_resa;      //可声明为成员变量

  2. CString sql;

  3. sql = "Select * from MYTABLE"//查询语句改变,相应下面的语句也要改变

  4.  

  5. //#include  //需加入头文件

  6. //CArray m_Array;   //可用容器保存你取得的数据

  7.  

  8. try

  9. {

  10.         m_res = m_conn->Execute((_bstr_t)sql,&m_resa,adCmdText);

  11. }

  12. catch(_com_error e)

  13. {

  14.         AfxMessageBox("数据库查错误",MB_ICONEXCLAMATION);

  15.         exit(0);

  16. }

  17.  

  18. //m_Array.RemoveAll();  //清空容器

  19.  

  20. try

  21. {

  22.         while(!m_res->adoEOF)   //循环遍历记录

  23.         {

  24.                 _variant_t vID, vName, vSex;

  25.                

  26.                 vID = m_res->GetCollect("ID");

  27.                 vName = m_res->GetCollect("NAME");

  28.                 vSex = m_res->GetCollect("SEX");

  29.        

  30.                 ///////////////////////////////////////////////

  31.                 int nID;

  32.                 nID = (long)vID.lVal;

  33.                 ///////////////////////////////////////////////

  34.                 CString strName;

  35.                 if(VT_NULL != vName.vt )        //如果数据不为空

  36.                 {

  37.                         strName = (LPCTSTR)vName.bstrVal;

  38.                 }

  39.                 ///////////////////////////////////////////////

  40.                 bool bSex;

  41.                 if(VT_NULL != vSex.vt )

  42.                 {

  43.                         bSex = (bool)vSex.boolVal;

  44.                 }

  45.                 ////////////////////////////////////////////////

  46.                

  47.                 //CMyClass one(nID, strName, bSex);     //创建数据对象

  48.                 //m_Array.Add(one);     //加入数组

  49.                

  50.                 m_res->MoveNext();      //移动到下一条记录

  51.         }

  52. }

  53. catch(_com_error e)

  54. {

  55.         AfxMessageBox("数据库查错误",MB_ICONEXCLAMATION);

  56.         exit(0);

  57. }


4.关闭数据库

  1. try

  2. {

  3.         if(m_res != NULL)

  4.         {

  5.                 m_res->Close()//关闭记录集

  6.         }

  7.         if(m_conn != NULL)

  8.         {

  9.                 m_conn->Close();        //关闭连接

  10.         }

  11. }

  12. catch(_com_error e)

  13. {

  14.         AfxMessageBox("数据库关闭错误",MB_ICONEXCLAMATION);

  15.         exit(0);

  16. }


5.总结
数据库操作多种多样,可以查查相关资料
这里只介绍了简单的一种操作,面向对象封装一下,直接调用即可

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