Question

您好我是一个数据库，我在vb.net应用程序中加载到Datagridview。它加载正常，但是当我尝试保存日期时它不起作用。这是代码

    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

在使用新行传递DataRow集合时，更新需要有效的InsertCommand。我该怎么办？

accessdatabase 3 colmuns和ID是主键 ID Field1 Field2

Answer 1

因此，您必须为DataAdapter

定义InsertCommand

旁注：行DSet.AcceptChanges()是多余的，因为上一行Dadapter.Update会隐含地调用AcceptChanges。

您应该将using-statement用于实现IDisposable的任何内容，例如Connection。即使出现异常，这也会隐含地调用Dispose（它会关闭连接）。

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

Answer 2

您需要从datagrid

读回数据集

con.Open()
DSet = DataGridView1.DataSource  '<<<<<<<<<<<<<<<<<<<<<<<
Dadapter.Update(DSet, "Table1")
DSet.AcceptChanges()
con.Close()

Answer 3

我的4种数据库的VB.NET代码（从DataGridView到数据库的更新信息）

Private Sub sqldb_savedata()
    Dim connectionString As String = "Server='" & sql_server & "';Database='" & sql_database & "';User Id='" & sql_user & "';Password='" & sql_pass & "'"
    Dim sqlCon = New SqlConnection(connectionString)
    If (sqlCon.State = ConnectionState.Closed) Then sqlCon.Open()
    Dim SQLAdapter = New SqlDataAdapter("SELECT * FROM clinics", sqlCon)
    Dim SQLDataSet As New DataSet
    Dim myTable = DataGridViewClinic.DataSource
    Dim cmdbuilder As New SqlCommandBuilder(SQLAdapter)
    SQLAdapter.Update(myTable, "clinics")
    MsgBox("Updated!", MsgBoxStyle.OkOnly, "")
End Sub

Private Sub mysqldb_savedata()
    Dim connectionString As String = "Server='" & mysql_server & "';Database='" & mysql_database & "';User Id='" & mysql_user & "';Password='" & mysql_pass & "'"
    Dim sqlCon = New MySqlConnection(connectionString)
    If (sqlCon.State = ConnectionState.Closed) Then sqlCon.Open()
    Dim SQLAdapter = New MySqlDataAdapter("SELECT * FROM clinics", sqlCon)
    Dim SQLDataSet As New DataSet
    Dim myTable = DataGridViewClinic.DataSource
    Dim cmdbuilder As New MySqlCommandBuilder(SQLAdapter)
    SQLAdapter.Update(myTable, "clinics")
    MsgBox("Updated!", MsgBoxStyle.OkOnly, "")
End Sub

Private Sub firebirddb_savedata()
    Dim connectionString As String = "Database='" & firebird_server & "';User=SYSDBA;Password=masterkey;Dialect=3;ServerType=1"
    Dim sqlCon = New FirebirdSql.Data.FirebirdClient.FbConnection(connectionString)
    If (sqlCon.State = ConnectionState.Closed) Then sqlCon.Open()
    Dim SQLAdapter = New FirebirdSql.Data.FirebirdClient.FbDataAdapter("SELECT * FROM clinics", sqlCon)
    Dim SQLDataSet As New DataSet
    Dim myTable = DataGridViewClinic.DataSource
    Dim cmdbuilder As New FirebirdClient.FbCommandBuilder(SQLAdapter)
    SQLAdapter.Update(myTable, "clinics")
    MsgBox("Updated!", MsgBoxStyle.OkOnly, "")
End Sub

 Private Sub localdb_savedata()
    DBconn = New SqlCeConnection("Data Source=Data Source=|DataDirectory|\Database.sdf")
    If (DBconn.State = ConnectionState.Closed) Then DBconn.Open()
    Dim SQLAdapter = New SqlCeDataAdapter("SELECT * FROM clinics", DBconn)
    Dim SQLDataSet As New DataSet
    Dim myTable = DataGridViewClinic.DataSource
    Dim cmdbuilder As New SqlCeCommandBuilder(SQLAdapter)
    SQLAdapter.Update(myTable, "clinics")
    MsgBox("Updated!", MsgBoxStyle.OkOnly, "")
End Sub

Datagridview将更改保存到Database vb.net

3 个答案: