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VB2005 DataBase Manipulation Command for Access. 引用類別定義 Imports System.Data.OleDb Imports System.Data.SqlClient Imports System.Data.Odbc Imports System.

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Presentation on theme: "VB2005 DataBase Manipulation Command for Access. 引用類別定義 Imports System.Data.OleDb Imports System.Data.SqlClient Imports System.Data.Odbc Imports System."— Presentation transcript:

1 VB2005 DataBase Manipulation Command for Access

2 引用類別定義 Imports System.Data.OleDb Imports System.Data.SqlClient Imports System.Data.Odbc Imports System

3 宣告公用物件變數 Public acCon As OleDbConnection Public acCmd As OleDbCommand

4 連線 Dim str As String str = “Provider=Microsoft.Jet.OLEDB.4.0; Data Source= 資料庫來源 " acCon = New OleDbConnection(str) If Not acCon.State = ConnectionState.Open Then acCon.Open()

5 建立 SQL 指令集物件 Dim str As String str=“SQL 指令 ” acCmd = New OleDbCommand(str, acCon)

6 開啟紀錄 Dim dr As OleDbDataReader acCmd = New OleDbCommand(str, acCon) dr = acCmd.ExecuteReader() 相關屬性與方法 : – FieldCount 欄數 – HasRows 有無紀錄 –Close() 關閉物件 –GetName(i) 取得欄名 –GetValue(i) 取得資料 –Read() 讀取一筆紀錄

7 循序輸出紀錄 While dr.Read() 讀取欄位資料 dr.Item(“ 欄名 ”) 或是 dr.Item(i) i 為欄位序號 End While

8 執行 SQL 指令 Dim str As String =“SQL 指令 ” acCmd = New OleDbCommand(str, acCon) acCmd.ExecuteNonQuery()

9 搭配 DataGridView 顯示資料 Dim ds As New DataSet Dim da As New OleDbDataAdapter(str, acCon) da.Fill(ds, “ 資料表名 ") Dim tbl AS DataTable tbl = ds.Tables (“ 資料表名 ") Dim DaView As DataView daView = tbl.DefaultView DataGridView1.DataSource = daView

10 DataGridView – 過濾資料 Dim strFilter As String strFilter = “ 欄名 =‘” & Value & “’” daView.RowFilter = strFilter 取消過濾 daView. RowFilter = Nothing

11 DataGridView – 過濾資料 Dim strSort As String strSort = “ 欄名 DESC|ASC” daView.Sort = strSort 取消排序 daView.Sort = Nothing

12 使用 DataTable 物件 : TBL 計算欄數 : TBL.Columns.Count 取得欄名 : TBL.Coumns(i).ColumnName 計算紀錄數 : TBL.Rows.Count 取得欄值 : TBL.Rows(i).Item(“ 欄名 ”), 或是 TBL.Rows(i).Item(j)

13 使用 BindingManagerBase 物件來移 動記憶體資料表之紀錄 Dim BM As BindingManagerbase BM = Me.BindingContext(DS, TableName) 附屬方法 –Position 目前位置 ( 0 ~ Count -1) –Count 筆數 –AddNew() 新增 –RemoveAt(n) 刪除第 n 筆, 從 0 起算 –EndCurrentEdit() 結束目前編輯, 將控制項資料回寫 DS 控制項須搭配下列指令來連結資料欄位 –Dim myBind As Binding = New Binding(“Text”, DS, “TableName,FieldName) – 控至項名.DataBindings.Add(myBind)


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