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vb.net关联数据表 vb连接excel数据库代码( 二 )

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Catch err As System.SystemException
dsTestOrders.RejectChanges()
MessageBox.Show(err.ToString)
Throw
End Try
End If
End SubPrivate Sub fmOrders_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
FillData()
dtOrderDetails = dsTestOrders.Tables("OrderDetails")
BmOrders = Me.BindingContext(dsTestOrders, "Orders")
BmOrderDetails = Me.BindingContext(dsTestOrders, "Orders.OrdersOrderDetails")
OrderDetailsHasChange = True
SubTotal = dsTestOrders.Tables("Orders").Columns("SubTotal")
SubTotal.DefaultValue = https://www.04ip.com/post/0
Price = dsTestOrders.Tables("OrderDetails").Columns("Price")
Price.DefaultValue = https://www.04ip.com/post/0
End SubPrivate Sub FillData()
dsTestOrders.EnforceConstraints = False
daOrders.Fill(dsTestOrders)
daOrderDetails.Fill(dsTestOrders)
dsTestOrders.EnforceConstraints = True
End Sub
Private Sub dtOrderDetails_ColumnChanged(ByVal sender As Object, ByVal e As System.Data.DataColumnChangeEventArgs) _
Handles dtOrderDetails.ColumnChangedDim drOrders As DataRow
Dim drOrderDetails As DataRow
Dim iSubTotal As Integer
Try
If OrderDetailsHasChange Then
OrderDetailsHasChange = False
drOrders = dsTestOrders.Tables("Orders").Rows(BmOrders.Position)
iSubTotal = 0
For Each drOrderDetails In drOrders.GetChildRows("OrdersOrderDetails")
iSubTotal = iSubTotal + drOrderDetails("price")
Next
drOrders.BeginEdit()
drOrders("SubTotal") = iSubTotal
drOrders.EndEdit()
End If
Finally
OrderDetailsHasChange = True
End Try
End SubPrivate Sub bndelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bndelete.Click
If BmOrders.Count0 Then
BmOrders.RemoveAt(BmOrders.Position)
End If
End SubPrivate Sub bncancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bncancel.Click
BmOrders.CancelCurrentEdit()End Sub
End Classscript type="text/javascript" src="" /script
script type="text/javascript" src="" /script
VB.NET中连接到数据库怎样关联到表?。?/h2>要建立一个数据集，在把控件上的输入值赋值到数据集相应的字段就可以了
vb.net 数据库多表关联问题 。涉及到多个表的数据 ， gridview就不能只是简单的绑定到一个表了 。
可以先select有关的数据，结果保存到一个dataset中，然后gridview绑定到这个dataset 。
多年不用vb做ado/dao编程了 ， 说的可能不确切，意思你要是能懂就ok了 。
vb.net如何与excel建立连接，并从里面查询并读取数据？1.新建一张表格 ， 在表格中导入学生的成绩表 ， 如图所示，将建立一个按钮，通过它来实现查找 。
2.单击菜单栏中的“开发工具”——插入——表单控件——按钮，在出现的十字箭头上拖住画出一个按钮，如图所示 。
3.在弹出的查找红对话框中选择“录制”，在弹出的“录制新宏”对话框中 ， 修改宏名称为“查找”，单击确定 。
4. 单击“开发工具”——查看代码，打开VBA编辑器 ， 如图所示 。
5.现在输入代码：
Sub 查找()
Dim jieguo As String, p As String, q As String
Dim c As Range
jieguo = Application.InputBox(prompt:="请输入要查找的值：", Title:="查找", Type:=2)
If jieguo = "False" Or jieguo = "" Then Exit Sub
Application.ScreenUpdating = False
Application.DisplayAlerts = False
With ActiveSheet.Cells
Set c = .Find(jieguo, , , xlWhole, xlByColumns, xlNext, False)
If Not c Is Nothing Then
p = c.Address
Do
c.Interior.ColorIndex = 4
q = qc.AddressvbCrLf
Set c = .FindNext(c)
Loop While Not c Is Nothing And c.Addressp

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