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      • vb.net教程之ADO.NET的核心組件

      • 2015-01-25 10:02 來源:未知

      ADO.NET的核心組件(相關vb.net教程)

      ADO.NET的核心組件主要包括:
      Connections:連接管理數據庫事務。
      Commands:向數據庫發送的操作命令。
      DataReaders:直接讀取流數據。
      DataSets和DataSetCommands:處理內存鏡像數據。
      ADO.NET首先用Connections對象在Web頁面和數據庫之間建立連接,然后通過Commands向數據庫提供者發出操作命令,使操作結果以流數據的形式返回連接。再通過DataReaders快速讀取流數據,保存數據到DataSets對象。最后再由DataSetCommands對象對數據進行集中訪問和操作。
      1.Connections對象
      .NET框架中共提供了兩個Connections對象:SQLConnection和ADOConnection。應用Connections對象時,先用Connections對象建立連接,然后調用Open方法來打開連接。通常建立鏈接時,要提供一些信息,如數據庫所在位置、數據庫名稱、用戶賬號、密碼等相關信息,Connection對象提供了一些常用屬性用來進行此類設置。
      SQLConnection的具體操作方法是:
      Dim myConnection as string = ″server=localhost;uid=liuguo;pwd=12345;database=northwind″
      Dim myConn As OleDbConnection = New OleDbConnection(myConnection)
      ADOConnection的具體操作方法是:
      Dim myConnection As string = ″localhost;uid=liuguo;pwd=12345;Intial catalog=Northwind;″
      Dim myConn As OleDbConnetion = New OleDbConnection(myConnection)
      MyConn.Open()
      2.Commands對象
      當鏈接到數據庫之后,可以使用Command對象對數據庫進行操作,如進行數據添加、刪除、修改等操作。一個命令(Command)可以用典型的SQL語句來表達,包括執行選擇查詢(Select Query)來返回記錄集,執行行動查詢(Action Query)來更新(增加、編輯或刪除)數據庫的記錄,或者創建并修改數據庫的表結構。當然命令(Command)也可以傳遞參數并返回值。 Command可以被明確的界定,或者調用數據庫中的存儲過程。
      Dim objCmd as New OleDbCommand(″SELECT * From users″, objConn)
      以上語句建立Command,根據習慣,也可以使用以下方法:
      Dim objCmd as New OleDbCommand()
      objCmd.Connection = objConn
      objCmd.CommandText = ″SELECT * FROM users″
      3.DataReaders對象
      DataReaders是專門用來讀取數據的對象,這個對象除了讀數據以外,不能做其他任何數據庫操作。
      Dim objReader as OleDbDataReader
      objReader = objCmd.ExecuteReader
      While objReader.Read
      Response.Write(objReader.GetString(0) & ″
      ″=
      End While
      4.DataSet對象
      DataSet是ADO.NET的核心。DataSet是一個存在于內存中的數據庫,也就是說它是離線的,并沒有同數據庫建立即時的連線。在 ADO.NET中,DataSet是專門用來處理從數據保存體(Data Store)中讀出的數據。不管底層的數據庫是SQL Server還是ADO,DataSet的行為都是一致的。可以使用相同的方式來操作從不同數據來源取得的數據。
      在DataSet中可以包含任意數量的DataTable(數據表),且每個DataTable對應一個數據庫的數據表(Table)或視圖 (View)。一般來說,一個對應DataTable對象的數據表就是一堆數據行(DataRow)與列(DataColumn)的集合。 DataTable會負責維護每一筆數據行保留它的初始狀態(Original State)和當前的狀態(Current State),以解決多人同時修改數據時引發的沖突問題。
      DataSet是XML與ADO結合的產物,它的一個重要的特點是與數據庫或SQL無關。它只是簡單地對數據表進行操作,交換數據或是將數據綁定到用戶界面上。
      如以下這個例子:
      Dim ds1 As New DataSet()
      Dim dtable As new DataTable(″people″)
      With dtable.Columns
      .Add(″FName″, System.Type.GetType(″System.String″))
      .Add(″LName″, System.Type.GetType(″System.String″))
      .Add(″UID″, System.Type.GetType(″System.Int32″))
      End With
      dtable.Columns(″UID″).AutoIncrement = True
      ds1.Tables.Add(dtable)
      dim pkey() as DataColumn = {ds1.Tables(″people″).Columns(″UID″)}
      ds1.Tables(″people″).PrimaryKey = pkey
      以上語句稍微有點復雜,我們來簡單分析一下。
      前半部分我們建立了一個DataSet和一個叫People的DataTable,然后,我們為這個DataTable加入了三個列并將“UID”列設為自動遞增。最后,將這個DataTable加入到了DataSet。最后我們定義一個叫pkey()的主鍵,將其指向People。
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