Question

重要编辑


我解决了这个问题。实际上这不是问题。发生的事情是当我调试程序时，一个新的.mdf文件在调试文件夹中创建，我的Datagridview和应用程序中的其他对象从中获取信息。但我使用的还原查询是在我的解决方案文件夹（主.mdf文件）上恢复数据库，所以每次我完成操作时，解决方案文件都会恢复并在下次调试时显示，因为它重新创建了.mdf文件解决方案文件夹中的调试文件夹。因此可以查看下一次调试。

我已经创建了一个内置的备份/恢复应用程序，我可以备份＆amp;恢复成功但成功恢复后我必须关闭应用程序并重新启动它以查看更改，但我不想关闭应用程序，而是希望它在成功恢复后立即显示更改，这样可能吗？如果是，那怎么样？

表格的屏幕截图：

当前代码：

Imports Microsoft.SqlServer.Server
Imports MySql.Data.MySqlClient
Imports System.Data.SqlClient

Public Class Test


    Sub Backup()
        With SaveFileDialog1
            .FileName = ""
            .Filter = "Backup File|*.bak"
            SaveFileDialog1.ShowDialog()
            If .FileName = "" Then
                Exit Sub
            Else
                Dim BUDate As New TextBox
                BUDate.Text = "Backup database BISDB To Disk='" + SaveFileDialog1.FileName + "'"
                Dim con As New SqlClient.SqlConnection("data source=.\SQLEXPRESS;initial catalog=BISDB;Integrated Security=True")
                Dim cmd As New SqlCommand()

                Try
                    con.Open()
                    cmd.CommandType = CommandType.Text
                    cmd.CommandText = BUDate.Text
                    cmd.Connection = con
                    cmd.ExecuteNonQuery()
                    MsgBox("Backup successfull!", MsgBoxStyle.OkOnly, "Backup")
                Catch ex As Exception
                    MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                End Try
            End If
        End With


    End Sub

    Private Sub Test_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Me.StudentsTableAdapter.Fill(Me.BIS.Students)

    End Sub

    Private Sub btnCalculate_Click(sender As Object, e As EventArgs) Handles btnCalculate.Click
        Backup()
    End Sub

    Private Sub btnRestore_Click(sender As Object, e As EventArgs) Handles btnRestore.Click
        With OpenFileDialog1
            .FileName = ""
            .Filter = "Backup File|*.bak"
            OpenFileDialog1.ShowDialog()
            If .FileName = "" Then
                Exit Sub
            Else
                Dim FileName As String = OpenFileDialog1.FileName
                Dim BUDate As New TextBox
                BUDate.Text = "RESTORE DATABASE BISDB FROM Disk='" + FileName + "'"
                Dim con2 As New SqlClient.SqlConnection("data source=.\SQLEXPRESS;initial catalog=master;Integrated Security=True")
                Dim cmd = New SqlCommand(BUDate.Text, con2)

                Try
                    con2.Open()
                    cmd.ExecuteNonQuery()
                    MsgBox("Restore Successfull!")
                    Me.StudentsTableAdapter.Fill(Me.BIS.Students) '//Edited According to Vignesh Kumar's Answer
                    Me.StudentsBindingSource.ResetBindings(False) '//Edited According to GuidoG's Answer
                Catch ex As Exception
                    MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                Finally
                    con2.Close()
                    con2.Dispose()

                End Try
            End If
        End With
    End Sub

    Private Sub btnClose_Click(sender As Object, e As EventArgs) Handles btnClose.Click
        'Me.BIS.Reset()
        'Me.StudentsBindingSource.Dispose()
        'Me.StudentsBindingSource.ResetAllowNew()
        Me.StudentsBindingSource.ResetBindings(True)
        Me.StudentsBindingSource.SuspendBinding()
        Me.StudentsBindingSource.ResumeBinding()

        Me.StudentsTableAdapter.Fill(Me.BIS.Students)
    End Sub
End Class

项目名称：

刷新按钮 - btnClose

备份按钮 - btnCalculate

恢复按钮 - btnRestore

Datagridview - DataGridView1

表格 - 测试

单击开始按钮启动应用程序：

我使用bindingsource来填充DataGridView，并且不使用任何代码来填充DataGridView但是Me.StudentsTableAdapter.Fill(Me.BIS.Students) 在加载表单时。

这就是我现在所得到的：

Dim command = New SqlCommand("", con2)
        command.CommandType = CommandType.Text
        Dim adapter As New SqlDataAdapter(command)
        DataGridView1.DataSource = adapter
        adapter.Fill(Me.BIS.Students)

Answer 1

您可以在恢复数据库的同时调用bindingsource来填充DataGridView。

Me.StudentsTableAdapter.Fill(Me.BIS.Students)

尝试如下：

  Private Sub
        With OpenFileDialog1
            .FileName = ""
            .Filter = "Backup File|*.bak"
            OpenFileDialog1.ShowDialog()
            If .FileName = "" Then
                Exit Sub
            Else
                Dim FileName As String = OpenFileDialog1.FileName
                Dim BUDate As New TextBox
                BUDate.Text = "RESTORE DATABASE BISDB FROM Disk='" + FileName + "'"
                Dim con2 As New SqlClient.SqlConnection("data source=.\SQLEXPRESS;initial catalog=master;Integrated Security=True")
                Dim cmd = New SqlCommand(BUDate.Text, con2)

                Try
                    con2.Open()
                    cmd.ExecuteNonQuery()
                    MsgBox("Restore Successfull!")
                    ' DataGrdiview Binding Code
                Catch ex As Exception
                    MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                Finally
                    con2.Close()
                    con2.Dispose()

                End Try
            End If
        End With
   End Sub

Answer 2

我想你必须在成功恢复后重新填充数据网格寻找评论
//成功恢复后重新填充数据网格在我的回答中

Private Sub
    With OpenFileDialog1
        .FileName = ""
        .Filter = "Backup File|*.bak"
        OpenFileDialog1.ShowDialog()
        If .FileName = "" Then
            Exit Sub
        Else
            Dim FileName As String = OpenFileDialog1.FileName
            Dim BUDate As New TextBox
            BUDate.Text = "RESTORE DATABASE BISDB FROM Disk='" + FileName + "'"
            Dim con2 As New SqlClient.SqlConnection("data source=.\SQLEXPRESS;initial catalog=master;Integrated Security=True")
            Dim cmd = New SqlCommand(BUDate.Text, con2)

            Try
                con2.Open()
                cmd.ExecuteNonQuery()

                // Refill the datagrid after succesfull restore
                Me.StudentsTableAdapter.Fill(Me.BIS.Students)

                MsgBox("Restore Successfull!")

            Catch ex As Exception
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Finally
                con2.Close()
                con2.Dispose()

            End Try
        End If
    End With
    End Sub

编辑：尝试的事情在任何地方的表单上放一个按钮，并在其中尝试此代码：

yourDataGridView.BindingSource = null
Me.StudentsTableAdapter.Fill(Me.BIS.Students)       
yourDataGridView.BindingSource = Me.StudentsBindingSource
Me.StudentsBindingSource.ResetBindings(False)

编辑：使用相同的连接填充命令（对不起，这是在c＃我不知道visual basic）

SqlCommand command = new SqlCommand("your query", con2);
command.CommandType = Command.Text;
SqlAdapter adapter = new SqlDataAdapter(command);
adapter.Fill(Me.BIS.Students);

编辑：用户查询的不同数据库：

SqlCommand command = new SqlCommand("use BISDB " + your query, con2);

如何在不使用Vb.Net重新启动应用程序的情况下从.bak恢复数据库时刷新Datagridview？

项目名称：

这就是我现在所得到的：

2 个答案: