VB.NET掌上電腦數據庫連接

Question

我創建了一個數據庫使用SQlServer CE與db.sdf的名稱使用下面的代碼。

Dim connStr As String = "Data Source =\temp\emp.sdf;" 
Try 
      'creating database 
      Dim engine As SqlCeEngine 
      engine = New SqlCeEngine(connStr) 
      engine.CreateDatabase() 
      engine.Dispose() 

      'creating table 
      Dim cn As New SqlCeConnection(connStr) 
      Dim sql As String 
      sql = "CREATE TABLE login " 
      sql &= "(" 
      sql &= " username nvarchar(20) PRIMARY KEY," 
      sql &= " password nvarchar(20)" 
      sql &= ")" 
      Dim cmd As New SqlCeCommand(sql, cn) 
      cmd.Connection.Open() 
      cmd.ExecuteNonQuery() 
      cmd.Connection.Close() 
      cmd.Dispose() 
      cn.Dispose() 

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

但我不知道它保留了這個emp.sdf文件以及如何查看它。我今天剛剛開始使用VB.NET Pocket PC應用程序，而且我非常困惑，因爲我的VB.NET連接代碼與Pocket PC應用程序不兼容，所以請幫助我如何解決此問題。請任何教程，可以幫助我。 感謝

Answer 1

你已經在你的連接字符串當您創建的數據庫提供的數據庫名稱...

Dim connStr As String = "Data Source =\temp\emp.sdf;" 

...所以你應該找一個\ temp文件夾下的\我的設備具有EMP .sdf文件在裏面。

Answer 2

Imports System.Data.SqlClient 
Public Class Form1 

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click 
     Dim connetionString As String 
     Dim cnn As SqlConnection 

     connetionString = "Data Source=database server name;Initial Catalog=database name" 
     cnn = New SqlConnection(connection string) 
     Try 
      cnn.Open() 

      MsgBox("Connection Open ! ") 
      cnn.Close() 
     Catch ex As Exception 
      MsgBox("Can not open connection ! ") 


     End Try 
    End Sub 
End Class