VC 中使用MFC通過ADO連線資料庫

++中使用mfc通過ado連線資料庫方法小結（不包括異常的捕捉）

這裡主要講mfc與access資料庫（sql2000方法差不多，主要是連線字串不同）

1、在stdafx

.h標頭檔案中加入此句子

#import 

"c:\program files\common files\system\ado\msado15.dll" 

no_namespace rename

("eof"

,"rseof"

)//不要命名空間,重命//名eof為rseof

這句話意味使用msado15

.dll動態連線庫檔案，裡面就有ado

2、實現從資料庫中提取顯示資料

coinitialize

(null

);    

//初始化com元件

_connectionptr pconn

(__uuidof

(connection

));    

//例項化乙個connection物件pconn

_recordsetptr prst

(__uuidof

(recordset

));    

//例項化乙個recordset物件prst

_commandptr pcmd

(__uuidof

(command

));    

//例項化乙個command物件pcmd

pconn

->

connectionstring

="provider=microsoft.jet.oledb.4.0;data source=student.mdb"

;//通過pconn物件連線字串，連線到access資料庫，這裡access資料庫在c根目錄下

pcmd

->

put_activeconnection

(_variant_t

((idispatch

*)pconn

));pcmd

->

commandtext

="select * from stu"

;    

//通過pcmd物件訪問資料庫

prst

=pcmd

->

execute

(null

,null

,adcmdtext

);while

(!prst

->

rseof

)prst

->

close

();    

//關閉物件

pconn

->

close

();pcmd

.release

();    

//釋放物件

prst

.release

();pconn

.release

();couninitialize

();    

//解除安裝com元件

3、實現插入記錄

coinitialize

(null

);_connectionptr pconn

(__uuidof

(connection

));_recordsetptr prst

(__uuidof

(recordset

));_commandptr pcmd

(__uuidof

(command

));_variant_t recordsaffected

;    

//申請乙個_variant_t型別的的變數

pconn

->

connectionstring

="provider=microsoft.jet.oledb.4.0;data source=student.mdb"

;pconn

->

open(""

,"",""

,adconnectunspecified

);prst

=pconn

->

execute

("insert into stu (學號,姓名,**) values ('2222','dddd','123456')"

,&recordsaffected

,adcmdtext

);//prst->close();    //若有此句可以實現插入，但會產生runtime錯誤提示   

pconn

->

close

();pcmd

.release

();prst

.release

();pconn

.release

();couninitialize

();4

、實現刪除記錄

coinitialize

(null

);_connectionptr pconn

(__uuidof

(connection

));_recordsetptr prst

(__uuidof

(recordset

));_commandptr pcmd

(__uuidof

(command

));_variant_t recordsaffected

;    

//申請乙個_variant_t型別的的變數

pconn

->

connectionstring

="provider=microsoft.jet.oledb.4.0;data source=student.mdb"

;pconn

->

open(""

,"",""

,adconnectunspecified

);prst

=pconn

->

execute

("delete from stu where 學號='2'"

,&recordsaffected

,adcmdtext

);pconn

->

close

();pcmd

.release

();prst

.release

();pconn

.release

();couninitialize