基本问题.net访问数据库的方法谁总结一下,我觉得ado.net基本功能没有ado好用,至于扩展的还没用上:(

用起来都差不多了，只是你不了解它的dataset有什么作用，劝你多看看帮助吧
微软做出来的东西，其实很好的，只是你不知道它的作用，难道微软的工程师比你还笨
！

mnm0756(mnm0756)
说的有理！
vabug (边缘)
你用了多久的.Net了？连这点好处都不知道！！

查询：通过SQL语句实现更新：在DATASET中更新DATATABLE的内容然后提交数据库
新增：在DATASET中的DATATABLE的中新增DATAROW然后提交数据库
删除：在DATASET中删除DATATABLE中的DATAROW然后提交数据库

edit:
<%@ 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
        BuildDataList
    End If
End Sub
Sub Edit_Grid(sender As Object, e As DataGridCommandEventArgs)
    dgEmps.EditItemIndex = e.Item.ItemIndex
    BuildDataList
End SubSub Update_Grid(ByVal Sender as Object, ByVal E as DataGridCommandEventArgs)
    Dim TheID as String
    Dim LastName as String
    Dim FirstName as String
    TheID = E.Item.Cells(2).Text
    LastName = CType(e.Item.Cells(0).Controls(0), TextBox).Text
    FirstName = CType(e.Item.Cells(1).Controls(0), TextBox).Text
    Dim DBConn as OleDbConnection
    Dim DBUpdate As New OleDbCommand
    DBConn = New OleDbConnection( _
        "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
        & "DATA SOURCE=" _
        & Server.MapPath("/tt/C4/DGDB.mdb;"))
    DBUpdate.CommandText = "Update Employees " _
        & "Set LastName = '" & LastName &"', " _
        & "FirstName = '" & FirstName & "' " _
        & "Where EmpID = " & TheID
    DBUpdate.Connection = DBConn
    DBUpdate.Connection.Open
    DBUpdate.ExecuteNonQuery()
    DBConn.Close
    dgEmps.EditItemIndex = -1
    BuildDataList
End Sub
Sub BuildDataList ()
        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("/tt/C4/DGDB.mdb;"))
        DBCommand = New OleDbDataAdapter _
            ("Select * From Employees " _
            & "Order By LastName, FirstName", DBConn)
        DBCommand.Fill(DSPageData, _
            "Employees")
        dgEmps.DataSource = _
            DSPageData.Tables("Employees").DefaultView
        dgEmps.DataBind()
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Editing Rows from a DataGrid Control</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
/>
<BR><BR>
<asp:datagrid
    id="dgEmps"
    runat="server"
    autogeneratecolumns="false"
    oneditcommand="Edit_Grid"
    onupdatecommand="Update_Grid"
    >
    <columns>
        <asp:boundcolumn
            HeaderText="Last Name"
            DataField="LastName"
        />
        <asp:boundcolumn
            HeaderText="First Name"
            DataField="FirstName"
        />
        <asp:boundcolumn
            datafield="EmpID"
            visible=False
            readonly=true
        />
        <asp:editcommandcolumn
             edittext="Edit"
             updatetext="Update"
             itemstyle-wrap="false"
             headertext="Edit"
             headerStyle-wrap="false"
        />
    </columns>
</asp:datagrid>
</form>
</BODY>
</HTML>

remove:
<%@ 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
        BuildDataList
    End If
End Sub
Sub Click_Grid(ByVal Sender as Object, ByVal E as DataGridCommandEventArgs)
    Dim TheID as String
    TheID = E.Item.Cells(1).Text
    Dim DBConn as OleDbConnection
    Dim DBDelete As New OleDbCommand
    DBConn = New OleDbConnection( _
        "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
        & "DATA SOURCE=" _
        & Server.MapPath("/tt/C4/DGDB.mdb;"))
    DBDelete.CommandText = "Delete From Employees Where " _
        & "EmpID = " & TheID
    DBDelete.Connection = DBConn
    DBDelete.Connection.Open
    DBDelete.ExecuteNonQuery()
    DBConn.Close
    BuildDataList
End Sub
Sub BuildDataList ()
        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("/tt/C4/DGDB.mdb;"))
        DBCommand = New OleDbDataAdapter _
            ("Select LastName & ', ' & FirstName " _
            & "as FullName, EmpID From Employees " _
            & "Order By LastName, FirstName", DBConn)
        DBCommand.Fill(DSPageData, _
            "Employees")
        dgEmps.DataSource = _
            DSPageData.Tables("Employees").DefaultView
        dgEmps.DataBind()
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Removing Rows from a DataGrid Control</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
/>
<BR><BR>
<asp:datagrid
    id="dgEmps"
    runat="server"
    autogeneratecolumns="false"
    onitemcommand="Click_Grid"
>
    <columns>
        <asp:boundcolumn
            HeaderText="Full Name"
            DataField="FullName"
        />
        <asp:boundcolumn
            DataField="EmpID"
            Visible=False
        />
        <asp:buttoncolumn
            HeaderText="Click to Delete"
            ButtonType="PushButton"
            Text="Delete Record"
        />
    </columns>
</asp:datagrid>
</form>
</BODY>
</HTML>

add:
<%@ 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
        BuildDataList
    End If
End Sub
Sub Edit_Grid(sender As Object, e As DataGridCommandEventArgs)
    dgEmps.EditItemIndex = e.Item.ItemIndex
    BuildDataList
End SubSub Update_Grid(ByVal Sender as Object, ByVal E as DataGridCommandEventArgs)
    Dim TheID as String
    Dim LastName as String
    Dim FirstName as String
    TheID = E.Item.Cells(2).Text
    LastName = CType(e.Item.Cells(0).Controls(0), TextBox).Text
    FirstName = CType(e.Item.Cells(1).Controls(0), TextBox).Text
    Dim DBConn as OleDbConnection
    Dim DBUpdate As New OleDbCommand
    DBConn = New OleDbConnection( _
        "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
        & "DATA SOURCE=" _
        & Server.MapPath("/tt/C4/DGDB.mdb;"))
    DBUpdate.CommandText = "Update Employees " _
        & "Set LastName = '" & LastName &"', " _
        & "FirstName = '" & FirstName & "' " _
        & "Where EmpID = " & TheID
    DBUpdate.Connection = DBConn
    DBUpdate.Connection.Open
    DBUpdate.ExecuteNonQuery()
    DBConn.Close
    dgEmps.EditItemIndex = -1
    BuildDataList
End Sub
Sub CommandAdd_Click(Sender As Object, E As CommandEventArgs)
    Dim DBConn as OleDbConnection
    Dim DBAdd As New OleDbCommand
    DBConn = New OleDbConnection( _
        "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
        & "DATA SOURCE=" _
        & Server.MapPath("/tt/C4/DGDB.mdb;"))
    DBAdd.CommandText = "Insert Into Employees (LastName) " _
        & "values ('')"
    DBAdd.Connection = DBConn
    DBAdd.Connection.Open
    DBAdd.ExecuteNonQuery()
    DBConn.Close
    dgEmps.EditItemIndex = 0
    BuildDataList
End Sub
Sub BuildDataList ()
        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("/tt/C4/DGDB.mdb;"))
        DBCommand = New OleDbDataAdapter _
            ("Select * From Employees " _
            & "Order By LastName, FirstName", DBConn)
        DBCommand.Fill(DSPageData, _
            "Employees")
        dgEmps.DataSource = _
            DSPageData.Tables("Employees").DefaultView
        dgEmps.DataBind()
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Adding Rows to a DataGrid Control</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
/>
<BR><BR>
<asp:datagrid
    id="dgEmps"
    runat="server"
    autogeneratecolumns="false"
    oneditcommand="Edit_Grid"
    onupdatecommand="Update_Grid"
    >
    <columns>
        <asp:boundcolumn
            HeaderText="Last Name"
            DataField="LastName"
        />
        <asp:boundcolumn
            HeaderText="First Name"
            DataField="FirstName"
        />
        <asp:boundcolumn
            datafield="EmpID"
            visible=False
            readonly=true
        />
        <asp:editcommandcolumn
             edittext="Edit"
             updatetext="Update"
             itemstyle-wrap="false"
             headertext="Edit"
             headerStyle-wrap="false"
        />
    </columns>
</asp:datagrid>
<BR><BR>
<asp:LinkButton
    id="butAdd"
    text="Add"
    commandname="Add"
    oncommand="CommandAdd_Click"
    runat="server"
/>
</form>
</BODY>
</HTML>

dataset能很方便的构筑你需要构筑的任何数据结构，
如：你有些数据数据库中是没有了，但是你可以在dataset里面构筑一个模拟数据库表的结构，然后显示其中的数据出来！

kld3000(汪洋 $& 不放弃 &$) ( ) 信誉：100
非常感谢,不过你用的都是OleDbCommand
没有用到dataset做删除,修改,添加呀!!!

ado.net好
你能建表,
重要的是非连接的!!
接分

调试易

基本问题.net访问数据库的方法谁总结一下,我觉得ado.net基本功能没有ado好用,至于扩展的还没用上:(

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