VB 。NET添加代码我想在窗体上加几个label用来提示错误会更好?。∑渲杏没猯abel1,密码为label2,确认密码为label3, 提交为button1,重置为button2,事例:其中名称为Warehouse的SQL数据库里面有一张Administrator1表有用户名和密码两个字段 。
'这里是添加的引用
Imports System.Data
Imports System.Data.SqlClient
'提交按钮
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If TextBox1.Text =
一对多关联的数据库在VB.NET中如何新增记录script type="text/javascript" src="" /script
script type="text/javascript" src="" /script
有两个表order(orderid,ordername,totalprice), orderdetail(orderid,productid,productname,price) 已经建立一对多
关联(orderid). 用VB.NET建立一个窗体, 用于主表和明细表vb.net插入记录代码的数据录入及更新.
在窗体上增加两个sqldataadapter,分别选择order和orderdetail表, 并生成数据集,在DATASET中建立关联(orderid) 主表中:ORDERID,ORDERNAME 绑定在两个TEXTBOX文本框中,用于接受用户的输入,totalprice接受明细表中price
的汇总值.
明细表绑定到一个DATAGRID控件, datasource:dsorder; datamember:order.orderorderdetail建立的关联名称
问题:在主表中新增一个记录,用户录入orderid和ordername后,进入明细表的录入,用户录入productid, productname, price后,提示 “明细orderID列不允许空值,要更正该值吗vb.net插入记录代码?”是什么原因?
用于连接主表的明细orderID如果输入跟主表一样的orderID时提示“ForeignKeyconstraint 要求在交叉表中存在子键值 。要更正该值吗vb.net插入记录代码?”
只有录入主表中的orderid和ordername后, 先更新主表数据源,才可以编辑更新明细表,这是为什么? 请问,有没有其他更好的方法, 实现主表和明细表的新增记录同时更新呢?谢谢关照vb.net插入记录代码!网友:方宇 回复:
附部分源代码:
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 DataColumnPrivate 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 SubPrivate 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 SubPrivate Sub bnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnUpdate.Click
Dim dsTestOrdersChange As DataSetBmOrderDetails.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 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 = iSubTotaldrOrderDetails("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中用insert语句向数据库中的多个表插入数据你的语句并没有完全贴出来?
要注意区别:
1,如果是插入完整的一条记录(包括所有字段)
INSERT INTO 表名称 VALUES (值1, 值2,....)
2,如果插入只包含若干个指定字段(其余字段为空)
INSERT INTO table_name (列1, 列2,...) VALUES (值1, 值2,....)
另外,你使用了变量,那么应该这样使用:
"insert into Personal_table ('"Name_CH"', ......
后面看不出了,
其实 , 你可以在这句之前 , 加一句输出,看看具体内容,你就知道了!
msgbox()在括号里把你的这个字符串放进去,看看结果是什么?
vb.net中向datagridview中添加,删除,修改记录并保存到access数据库,求代码一般是将access数据库绑定到datagridview中,要添加数据只需要datagridview1.Item(3, 0).Value=https://www.04ip.com/post/XXX这种就行了,删除修改同理 。保存到access是你已经有了一个access表吧?不然字段都要新建的 。如果要保存到数据库的话就调用sql语句链接数据库了,我找个以前的代码Dim OleDbConn As OleDbConnection = New OleDbConnection("provider=microsoft.jet.oledb.4.0;data source=保存信息\保存信息.mdb;persist security info=false")
OleDbConn.Open()
Dim adapter As New OleDbCommand("insert into 受检单位信息(检测日期,测量器具) values(#"DateTimePicker1.Value"#,'"测量器具"')", OleDbConn)
adapter.ExecuteNonQuery()
VB.net 在MSSQL数据库 插入一条记录 语句?rs.Open("select top 1 * from zhiwu ", conn, 1, 3)
修改为vb.net插入记录代码:
rs.Open("select * from zhiwu ", conn, 3, 3)
vb.net插入记录代码你上面vb.net插入记录代码的语句的打开方式是只读(,1,3),不能插入的;并且限定位置(top 1) , 无法插入 。
rs.Fields(1).Value = https://www.04ip.com/post/5'试过rs.Fields(1) = 5,在编辑器就提示出错vb.net插入记录代码了
如果这个字段是数字,应该没有问题 。
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