一對(duì)多關(guān)聯(lián)的數(shù)據(jù)庫在VB.NET中如何新增記錄

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有兩個(gè)表order(orderid,ordername,totalprice), orderdetail(orderid,productid,productname,price) 已經(jīng)建立一對(duì)多

關(guān)聯(lián)(orderid). 用VB.NET建立一個(gè)窗體, 用于主表和明細(xì)表的數(shù)據(jù)錄入及更新.

在窗體上增加兩個(gè)sqldataadapter,分別選擇order和orderdetail表, 并生成數(shù)據(jù)集,在DATASET中建立關(guān)聯(lián)(orderid) 主表中:ORDERID,ORDERNAME 綁定在兩個(gè)TEXTBOX文本框中,用于接受用戶的輸入,totalprice接受明細(xì)表中price

的匯總值.

明細(xì)表綁定到一個(gè)DATAGRID控件, datasource:dsorder; datamember:order.orderorderdetail建立的關(guān)聯(lián)名稱

問題: 在主表中新增一個(gè)記錄,用戶錄入orderid和ordername后,進(jìn)入明細(xì)表的錄入,用戶錄入productid, productname, price后,提示 “明細(xì)orderID列不允許空值，要更正該值嗎？” 是什么原因?

用于連接主表的明細(xì)orderID如果輸入跟主表一樣的orderID時(shí)提示“ForeignKeyconstraint 要求在交叉表中存在子鍵值。要更正該值嗎？”

只有錄入主表中的orderid和ordername后, 先更新主表數(shù)據(jù)源,才可以編輯更新明細(xì)表,這是為什么? 請(qǐng)問,有沒有其他更好的方法, 實(shí)現(xiàn)主表和明細(xì)表的新增記錄同時(shí)更新呢? 謝謝關(guān)照！ 網(wǎng)友：方宇 回復(fù)：

附部分源代碼:

Public Class fmOrders

Inherits System.Windows.Forms.Form

Dim WithEvents dtOrderDetails As New DataTable()

Dim BmOrders As BindingManagerBase

Dim BmOrderDetails As BindingManagerBase

Dim OrderDetailsHasChange As Boolean

Dim orderid As DataColumn

dim ordername as datacolumn

Dim SubTotal As DataColumn Private Sub bnFirst_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnFirst.Click

BmOrders.Position = 0

End Sub

Private Sub bnPrior_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnPrior.Click

BmOrders.Position -= 1

End Sub

Private Sub bnNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnNext.Click

BmOrders.Position += 1

End Sub

Private Sub bnLast_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnLast.Click

BmOrders.Position = BmOrders.Count - 1

End Sub Private Sub bnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnAdd.Click

Try

BmOrders.EndCurrentEdit()

BmOrders.AddNew()

Catch err As System.SystemException

MessageBox.Show(err.ToString)

End Try

End Sub

Private Sub bnLoad_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnLoad.Click

FillData()

End Sub Private Sub bnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnUpdate.Click

Dim dsTestOrdersChange As DataSet BmOrderDetails.EndCurrentEdit()

BmOrders.EndCurrentEdit()

If Not dsTestOrders.HasChanges(DataRowState.Deleted) Then

Try

daOrders.Update(dsTestOrders, "Orders")

daOrderDetails.Update(dsTestOrders, "OrderDetails")

dsTestOrders.AcceptChanges()

Catch err As System.SystemException

dsTestOrders.RejectChanges()

MessageBox.Show(err.ToString)

Throw

End Try

Else

Try

daOrderDetails.Update(dsTestOrders, "OrderDetails")

daOrders.Update(dsTestOrders, "Orders")

dsTestOrders.AcceptChanges()

Catch err As System.SystemException

dsTestOrders.RejectChanges()

MessageBox.Show(err.ToString)

Throw

End Try

End If

End Sub Private 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 = 0

Price = dsTestOrders.Tables("OrderDetails").Columns("Price")

Price.DefaultValue = 0

End Sub Private 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.ColumnChanged Dim 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 Sub Private Sub bndelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bndelete.Click

If BmOrders.Count 0 Then

BmOrders.RemoveAt(BmOrders.Position)

End If

End Sub Private Sub bncancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bncancel.Click

BmOrders.CancelCurrentEdit() End Sub

End Class script type="text/javascript" src="" /script

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VB 2010(.net) SQL數(shù)據(jù)庫添加記錄，數(shù)據(jù)里沒有，如何處理

如果你是用SqlDataAdapter，那么你最后要加一句:

SqlDataAdapter.Update(objds,虛擬表名)

至于補(bǔ)充問題:

試試用這樣的方法:

dim

send,e

as

object

spdDetail2_CellClick(send,e)

或

spdDetail2_CellClick(nothing,nothing)

還再不行!那么你獨(dú)立寫一個(gè)方法就好了!

然后But_Clear_Click(...)調(diào)用這個(gè)方法，

其他地方需要也調(diào)用這個(gè)方法!

VB.NET如何插入sql記錄，高手指點(diǎn)

Const?sql?As?String?=?"INSERT?INTO?idc?(name,?tel)?VALUES?(22,11)"

Const?cnStr?As?String?=?"Data?Source=(local);Initial?Catalog=master;Integrated?Security=False;User?ID=sa;Password=123456;"

Dim?cn?As?OleDbConnection?=?New?OleDbConnection(cnStr)

Dim?cmd?As?OleDbCommand?=?New?OleDbCommand(sql)

cmd.ExecuteNonQuery()