ASP.Net/ADO.net Database/Access Database — различия между версиями

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Версия 15:30, 26 мая 2010

Connect to access database file (mdb) through asp page

<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<script language="vb" runat="server">
Sub Page_Load(Sender As Object, E as EventArgs)
  Dim objConnection As OleDbConnection
  Dim objCommand As OleDbDataAdapter
  Dim strConnect As String
  Dim strCommand As String
  Dim DataSet1 As New DataSet
  strConnect =  "Provider=Microsoft.Jet.OLEDB.4.0;"
  strConnect += "Data Source=yourDatabase.mdb;"
  strConnect += "Persist Security Info=False"
  strCommand = "SELECT ProductName, UnitPrice FROM products"
  objConnection = New OleDbConnection(strConnect)
  objCommand = New OleDbDataAdapter(strCommand, objConnection)
  objCommand.Fill(DataSet1, "products")
  DataGrid1.DataSource=DataSet1.Tables("Products").DefaultView
  DataGrid1.DataBind()
End Sub
</script>
<html>
<head>
<title>Data Grid Control example</title>
</head>
<body>
<asp:DataGrid id="DataGrid1" runat="server"  />
</body>
</html>



Display data from Access in different controls

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OLEDB" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Not IsPostBack Then
        Dim DBConn as OleDbConnection
        Dim DBCommand As OleDbDataAdapter
        Dim DSPageData as New DataSet
        DBConn = New OleDbConnection( _
            "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
            & "DATA SOURCE=" _
            & Server.MapPath("EmployeeDatabase.mdb;"))
        DBCommand = New OleDbDataAdapter _
            ("Select LastName & ", " & FirstName " _
            & "as EmpName, ID " _
            & "From Employee " _
            & "Order By LastName, FirstName", DBConn)
        DBCommand.Fill(DSPageData, _
            "EmployeeNames")
        DBCommand = New OleDbDataAdapter _
            ("Select * from Employee", DBConn)
        DBCommand.Fill(DSPageData, _
            "EmployeesAll")
        DBCommand = New OleDbDataAdapter _
            ("Select LastName from Employee", DBConn)
        DBCommand.Fill(DSPageData, _
            "Emp3")
        ddlEmps.DataSource = _
            DSPageData.Tables("EmployeeNames").DefaultView
        ddlEmps.DataBind()
        dgEmps2.DataSource = _
            DSPageData.Tables("EmployeesAll").DefaultView
        dgEmps2.DataBind()
        dgEmps3.DataSource = _
            DSPageData.Tables("Emp3").DefaultView
        dgEmps3.DataBind()
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Retrieving Access Data</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:dropdownlist
    id="ddlEmps"
    datatextfield="EmpName" 
    datavaluefield="ID"
    runat="server"
/>
<BR><BR>
<asp:datagrid
    id="dgEmps2" 
    runat="server" 
    autogeneratecolumns="True"
>
</asp:datagrid>
<BR><BR>
<asp:datagrid
    id="dgEmps3" 
    runat="server" 
    autogeneratecolumns="True"
>
</asp:datagrid>
</form>
</BODY>
</HTML>


<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>


Display data from Access to asp:Datagrid

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OLEDB" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    Dim DBConn as OleDbConnection
    Dim DBCommand As OleDbDataAdapter
    Dim DSPageData as New DataSet
    DBConn = New OleDbConnection( _
        "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
        & "DATA SOURCE=" _
        & Server.MapPath("EmployeeDatabase.mdb;"))
    DBCommand = New OleDbDataAdapter _
        ("Select * from Employee", DBConn)
    DBCommand.Fill(DSPageData, _
        "EmployeeAll")
    DBCommand = New OleDbDataAdapter _
        ("Select LastName " _
        & " from Employee", DBConn)
    DBCommand.Fill(DSPageData, _
        "Employees")
    dgEmps1.DataSource = _
        DSPageData.Tables("EmployeeAll").DefaultView
    dgEmps1.DataBind()
    dgEmps2.DataSource = _
        DSPageData.Tables("Employees").DefaultView
    dgEmps2.DataBind()
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Displaying Access Data in a DataGrid Control</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:datagrid
    id="dgEmps1" 
    runat="server" 
    autogeneratecolumns="True"
>
</asp:datagrid>
<BR><BR>
<asp:datagrid
    id="dgEmps2" 
    runat="server" 
    autogeneratecolumns="True"
>
</asp:datagrid>
</form>
</BODY>
</HTML>


<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>


Displaying Access Data in a DropDownList Control

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OLEDB" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Not IsPostBack Then
        Dim DBConn as OleDbConnection
        Dim DBCommand As OleDbDataAdapter
        Dim DSPageData as New DataSet
        DBConn = New OleDbConnection( _
            "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
            & "DATA SOURCE=" _
            & Server.MapPath("EmployeeDatabase.mdb;"))
        DBCommand = New OleDbDataAdapter _
            ("Select LastName & ", " & FirstName " _
            & "as EmpName, ID " _
            & "From Employee " _
            & "Order By LastName, FirstName", DBConn)
        DBCommand.Fill(DSPageData, _
            "Employee")
        ddlEmps.DataSource = _
            DSPageData.Tables("Employee").DefaultView
        ddlEmps.DataBind()
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Displaying Access Data in a DropDownList Control</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:dropdownlist
    id="ddlEmps"
    datatextfield="EmpName" 
    datavaluefield="ID"
    runat="server"
/>
</form>
</BODY>
</HTML>


<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>


Iterating through Records in an Access Table

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OLEDB" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    Dim DBConn as OleDbConnection
    Dim DBCommand As OleDbDataAdapter
    Dim DSPageData as New DataSet
    Dim I as Long
    DBConn = New OleDbConnection( _
        "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
        & "DATA SOURCE=" _
        & Server.MapPath("EmployeeDatabase.mdb;"))
    DBCommand = New OleDbDataAdapter _
        ("Select * from Employee", DBConn)
    DBCommand.Fill(DSPageData, _
        "Employee")
    For I = 0 To _
        DSPageData.Tables("Employee").Rows.Count - 1
        "Code to process record
        lblMessage.Text = lblMessage.Text _
            & "<BR>Processed Record: " _
            & DSPageData.Tables("Employee"). _
            Rows(I).Item("ID")
    Next
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Iterating through Records in an Access Table</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:label
    id="lblMessage"
    runat="Server"
/>
</form>
</BODY>
</HTML>


<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>


Updating Access Data

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OLEDB" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Not IsPostBack Then
        Dim DBConn as OleDbConnection
        Dim DBCommand As OleDbDataAdapter
        Dim DSPageData as New DataSet
        DBConn = New OleDbConnection( _
            "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
            & "DATA SOURCE=" _
            & Server.MapPath("EmployeeDatabase.mdb;"))
        DBCommand = New OleDbDataAdapter _
            ("Select LastName & ", " & FirstName " _
            & "as EmpName, ID " _
            & "From Employee " _
            & "Order By LastName, FirstName", DBConn)
        DBCommand.Fill(DSPageData, _
            "Employee")
        ddlEmps.DataSource = _
            DSPageData.Tables("Employee").DefaultView
        ddlEmps.DataBind()
    End If
End Sub
Sub SubmitBtn_Click(Sender As Object, E As EventArgs)
    Dim DBConn as OleDbConnection
    Dim DBUpdate As New OleDbCommand
    DBConn = New OleDbConnection( _
        "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
        & "DATA SOURCE=" _
        & Server.MapPath("EmployeeDatabase.mdb;"))
    DBUpdate.rumandText = "Update Employee Set " _
        & "FirstName = "" & txtFirstName.Text & "" Where " _
        & "ID = " & ddlEmps.SelectedItem.Value
        
    DBUpdate.Connection = DBConn
    DBUpdate.Connection.Open
    DBUpdate.ExecuteNonQuery()
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Updating Access Data</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
Select the Employee to Update
<BR><BR>
<asp:dropdownlist
    id="ddlEmps"
    datatextfield="EmpName" 
    datavaluefield="ID"
    runat="server"
/>
<BR><BR>
New First Name:
<BR>
<asp:textbox
    id="txtFirstName"
    runat="Server"
/>
<BR><BR>
<asp:button 
    id="butOK"
    text="  OK  "
    onclick="SubmitBtn_Click" 
    runat="server"
/>  
</form>
</BODY>
</HTML>


<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>

Источник — «http://nfex.ru/index.php?title=ASP.Net/ADO.net_Database/Access_Database&oldid=1572»