電大數(shù)據(jù)庫應用考試必備考試小抄-資料下載頁
2025-06-02 21:59本頁面
【正文】 aad，編寫程序代碼用于填充數(shù)據(jù)集和更新數(shù)據(jù)集 4 在 窗體中添加控件，并設置其屬性和dataset 對象中的表和屬性列乊間的關系，應用程序針對 dataset 進 行數(shù)據(jù)檢索和數(shù)據(jù)更新操作 數(shù)據(jù)庫訪問方法：通過 sqlmand 直接訪問 2 通過數(shù)據(jù)綁定 3 通過dataadapter 和 dataset 對象進行 Private sub form1_load(…)handles Dim myconn as sqlconnection=new sqlconnection(“ data source=local。integrated security=sspi。initial catalog=tjdb” ) Dim mycmd as new sqlmand =myconn =” select * from s…” Dim myadapter as sqldataadapter=new sqldataadapter(mycmd) Dim mydataset as new dataset (mydataset,” s” ) =(“ s” ) End sub Private sub form1_load()handles Dim sum as integer=0 Dim count as integer=0 Dim mysql as string =” select * from sc” Dim myconnstr as string+” initial catalog= 學 生 選 課 。data source=local。intergrated security=sspi?！? Dim myconn as new (myconnstr) Dim mym as =new (mysql,myconn) () Dim mydatareader as Mydatareader=() Do while () Sum=sum+(2) Count=count+1 Loop () ) Sum=sum/count Msgbox(sum) End sub
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