您好我是一个数据库,我加载到vb.net应用程序中的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
当使用新行传递DataRow集合时,更新需要有效的InsertCommand。我应该做些什么?
访问数据库3列和ID是主键ID Field1 Field2
所以你必须为你InsertCommand
定义一个DataAdapter
旁注:线DSet.AcceptChanges()
是多余的,因为前一行Dadapter.Update
将隐含地调用AcceptChanges
。
您应该使用using-statement
来实现IDisposable
之类的任何连接。即使在异常的情况下,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()
同
Using con = New OleDbConnection(myConString)
con .Open()
Dadapter.Update(DSet, "Table1")
End Using
您需要从数据网格中读回数据集
con.Open()
DSet = DataGridView1.DataSource '<<<<<<<<<<<<<<<<<<<<<<<
Dadapter.Update(DSet, "Table1")
DSet.AcceptChanges()
con.Close()
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