为数据gridview选择不同的连接字符串 [英] Selecting different connection strings for data gridview

问题描述

为什么这不是直截了当的？我有两个数据库，每个数据库都包含一个日志表。我有一个存储过程，可以从表中提取数据。我在Windows窗体上有一个datagridview，并且有一个下拉框为各个数据库选择连接字符串。在选择conn字符串时，我想更改datagridview以在所选数据库中包含日志消息。
我的代码：

Why is this not straight-forward? I have two databases that contain a log-table each. I have a stored procedure that extracts the data from the table. I have a datagridview on a windows form, and a drop-down box to select the connection string for the respective databases. On selection of the conn string, I want to change the datagridview to contain the log messages in the selected database. My code:

Select Case cboConnection.Text
    Case "CP DEV"
        LogConnectionString = "Data Source=SAMBAR.gofast.com;Initial Catalog=CPDev;User ID=gofastconfig;Password=gofastdev;" 
    Case "CP LIVE"
        LogConnectionString = "Data Source=SAMBAR.gofast.com;Initial Catalog=CPLive;User ID=gofastconfig;Password=gofastlive;"
End Select

Dim cmd As New SqlCommand("dbo.getLogMessages") 
Using con As New SqlConnection(LogConnectionString)
    Using sda As New SqlDataAdapter() 
        cmd.Connection = con 
        cmd.CommandType = CommandType.StoredProcedure
        sda.SelectCommand = cmd
        sda.Fill(Me.CustomerPulseDBDataSet1)
        con.Close()  
        gridLog.DataSource = Me.CustomerPulseDBDataSet1.Tables(0)
    End Using
End Using

推荐答案

首先，我看不到您打开连接。然后，将它倒过来一点……

First, I don't see you open your connection. Then, you got it a bit up side down...

Using con As New SqlConnection(LogConnectionString)
    con.Open()
    Using cmd As New SqlCommand("dbo.getLogMessages", con)
        cmd.CommandType = CommandType.StoredProcedure

        Using da As New SqlDataAdapter(cmd) 
            ' We need to clear out old data before reloading if same DS instance used
            If Me.CustomerPulseDBDataSet1.Tables.Count > 0 Then
                Me.CustomerPulseDBDataSet1.Tables.Clear()
            End If
            da.Fill(Me.CustomerPulseDBDataSet1)
        End Using  

    End Using
    con.Close()
End Using 

gridLog.DataSource = Me.CustomerPulseDBDataSet1.Tables(0)

每次都应该完美工作

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