Datagridview 将更改保存到数据库 vb.net

问题描述

你好，我有一个数据库，我在 vb.net 应用程序中加载到 Datagridview.它加载良好，但是当我尝试保存日期时它不起作用.这是代码

Hello i've a databse that i load to Datagridview in vb.net application.it loads fine, however when i try to save the date it doesn't work.here is the code

    Private myConString As String
Private con As OleDbConnection = New OleDbConnection
Private Dadapter As OleDbDataAdapter
Private DSet As DataSet
Private DSet2 As DataSet
Private ConCMD As OleDb.OleDbCommand

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    myConString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=e:Database31.accdb"
    con.ConnectionString = myConString
    con.Open()
    Dadapter = New OleDbDataAdapter("select * from Table1", con)
    DSet = New DataSet
    Dadapter.Fill(DSet, "Table1")
    DataGridView1.DataSource = DSet.Tables("Table1")
    con.Close()
End Sub


Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    con.Open()
    Dadapter.Update(DSet, "Table1")
    DSet.AcceptChanges()
    con.Close()
End Sub

当传递带有新行的 DataRow 集合时，更新需要有效的 InsertCommand.我该怎么办?

Update requires a valid InsertCommand when passed DataRow collection with new rows.what am i supposed to do?

accessdatabase 3 列和 ID 为主键ID 字段 1 字段 2

the accessdatabase 3 colmuns and ID is primary keyID Field1 Field2

推荐答案

所以你必须定义一个 InsertCommand 为你DataAdapter

旁注:DSet.AcceptChanges() 行是多余的，因为前一行 Dadapter.Update 将隐式调用 AcceptChanges.

Side-note: The line DSet.AcceptChanges() is redundant since the previous line Dadapter.Update will call AcceptChanges implicitely.

您应该将 using-statement 用于任何实现 IDisposable 的东西，例如 Connection.即使发生异常，这也会隐式调用 Dispose(关闭连接).

You should use using-statement for anything implementing IDisposable like a Connection. That would call Dispose(which closes the connection) implicitely even in case of an exception.

所以替换:

con.Open()
Dadapter.Update(DSet, "Table1")
DSet.AcceptChanges()
con.Close()

与

Using con =  New OleDbConnection(myConString)
    con .Open()
    Dadapter.Update(DSet, "Table1")
End Using

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