显示数据库连接状态的实例

分类：VB.Net

乐博网lob.cn提示：调试环境为 vs2005 +  windows2003 / windows2008 / xp / vista + .NET Framework 2.0

代码如下：

Option Strict On
Imports System.Data.SqlClient
Public Class LOB

    Private Sub bt_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConnect.Click

        ' 建立一个状态信息对话框对象。
        Dim frmStatusMessage As New frmStatus

        Try
            ' 利用 SqlConnectionStringBuilder 对象来构建连接字符串。
            Dim connectStringBuilder As New SqlConnectionStringBuilder()
            connectStringBuilder.DataSource = Me.txtDataSource.Text.Trim
            connectStringBuilder.InitialCatalog = Me.txtDataBase.Text.Trim
            connectStringBuilder.IntegratedSecurity = True

            ' 显示一个状态讯息对话框来表示我们目前要尝试连结至 SQL Server。
            frmStatusMessage.Show("乐博网提示：连接至 SQL Server 中....")

            Using cn As New SqlConnection(connectStringBuilder.ConnectionString)
                cn.Open()

                Dim ds As New DataSet()

                Dim cmdLiming As New SqlCommand("SELECT * FROM sys.tables", cn)

                Using drLiming As SqlDataReader = cmdLiming.ExecuteReader()

                    ds.Load(drLiming, LoadOption.OverwriteChanges, New String() {"数据表列举"})

                    ' 将 BindingSource 组件绑定到 DataSet 当中的“数据表列举”数据表。
                    Me.BindingSource1.DataSource = ds.Tables("数据表列举")

                    ' 将 DataGridView 控件绑定到 BindingSource 组件。
                    Me.DataGridView1.DataSource = Me.BindingSource1

                End Using
            End Using

        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try

        frmStatusMessage.Close()
    End Sub

    Private Sub LOB_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class