如何连接SDF数据库？我试过没有连接字符串似乎工作

Question

我已尝试在我的本地数据库的连接字符串上进行50多次不同的尝试,似乎没有任何工作.我本质上只是试图打开数据库文件的连接,所以我可以转储我从excel电子表格中提取的数据.我正在使用Visual C#制作离线winform应用程序.

无论我在app.config中尝试什么连接字符串,它总是在尝试将"dReader"写入数据库时​​失败.

错误通常取决于我尝试的字符串:

"建立与SQL Server的连接时发生与网络相关或特定于实例的错误.未找到服务器或无法访问服务器.验证实例名称是否正确以及SQL Server是否配置为允许远程连接.(提供程序:命名管道提供程序,错误:40 - 无法打开与SQL Server的连接)"

我已经浏览了许多在线示例和资源,似乎没有任何工作.我希望这里有人可以指出它为什么会失败.

这是我最新形式的app.config:

<connectionStrings>
    <add name="DDP_Project.Properties.Settings.DDP_DatabaseConnectionString"
        connectionString="Data Source=E:\Other DDP Projects\DDP_Project_SDF\DDP_Project\DDP_Database.sdf;"
        providerName="Microsoft.SqlServerCe.Client.3.5" />
</connectionStrings>

这是我的表单代码:

    private void Profiles_Click(object sender, EventArgs e)
    {
        profilesDialog.FileName = "[YOUR_UPLOAD_FILE_HERE]";
        var result = profilesDialog.ShowDialog();

        if (result == DialogResult.OK)
        {
            HandleFileSelection();
        }
    }

    private void HandleFileSelection()
    {
        var file = profilesDialog.FileName;


         // Create a connection to the file datafile.sdf in the program folder
    string dbfile = new System.IO.FileInfo(System.Reflection.Assembly.GetExecutingAssembly().Location).DirectoryName + "\\DDP_Database.sdf";
    SqlCeConnection connection = new SqlCeConnection("datasource=" + dbfile);


    string strConnection = ConfigurationManager.ConnectionStrings["DDP_Project.Properties.Settings.DDP_DatabaseConnectionString"].ConnectionString;


        //Create connection string to Excel work book
        string excelConnectionString = string.Format(
            @"Provider=Microsoft.Jet.OLEDB.4.0;
            Data Source=""{0}"";
            Extended Properties=""Excel 8.0;HDR=YES;""", file
        );

        //Create Connection to Excel work book
        OleDbConnection excelConnection = new OleDbConnection(excelConnectionString);
        OleDbCommand cmd = new OleDbCommand("SELECT [ID],[STATUS],[FAN_NUM],[PROFILE_NAME],[DESTINATION_HOST],[USER_ID],[USER_PASSWORD],[PROTOCOL],[PORT],[PATH],[CONTACT_NAME],[CONTACT_EMAIL],[CONTACT_PHONE],[CONTACT_ALT_PHONE],[CONTACT_CITY],[CONTACT_STATE],[CONTACT_CONTACT_TIME] FROM [Sheet1$]", excelConnection);

        excelConnection.Open();
        OleDbDataReader dReader;
        dReader = cmd.ExecuteReader();

        SqlBulkCopy sqlBulk = new SqlBulkCopy(strConnection);

        sqlBulk.DestinationTableName = "Profiles";
        sqlBulk.ColumnMappings.Add("ID", "ID");
        sqlBulk.ColumnMappings.Add("STATUS", "STATUS");
        sqlBulk.ColumnMappings.Add("FAN_NUM", "FAN_NUM");
        sqlBulk.ColumnMappings.Add("PROFILE_NAME", "PROFILE_NAME");
        sqlBulk.ColumnMappings.Add("DESTINATION_HOST", "DESTINATION_HOST");
        sqlBulk.ColumnMappings.Add("USER_ID", "USER_ID");
        sqlBulk.ColumnMappings.Add("USER_PASSWORD", "USER_PASSWORD");
        sqlBulk.ColumnMappings.Add("PROTOCOL", "PROTOCOL");
        sqlBulk.ColumnMappings.Add("PORT", "PORT");
        sqlBulk.ColumnMappings.Add("PATH", "PATH");
        sqlBulk.ColumnMappings.Add("CONTACT_NAME", "CONTACT_NAME");
        sqlBulk.ColumnMappings.Add("CONTACT_EMAIL", "CONTACT_EMAIL");
        sqlBulk.ColumnMappings.Add("CONTACT_PHONE", "CONTACT_PHONE");
        sqlBulk.ColumnMappings.Add("CONTACT_ALT_PHONE", "CONTACT_ALT_PHONE");
        sqlBulk.ColumnMappings.Add("CONTACT_CITY", "CONTACT_CITY");
        sqlBulk.ColumnMappings.Add("CONTACT_STATE", "CONTACT_STATE");
        sqlBulk.ColumnMappings.Add("CONTACT_CONTACT_TIME", "CONTACT_CONTACT_TIME");

        sqlBulk.WriteToServer(dReader);
        sqlBulk.Close();
        excelConnection.Close();

    }

    private void profilesDialog_FileOk(object sender, EventArgs e)
    {


    }
}

}

Answer 1

尝试这个...

第一的：

首先创建一个测试方法，您可以检查是否可以连接到 sqlcedatabase。

private void testconnection()
{
  string strConnection = ConfigurationManager.ConnectionStrings["DDP_Project.Properties.Settings.DDP_DatabaseConnectionString"].ConnectionString;                     
  using (var conn = new SqlCeConnection(string.Format("Data Source={0};Max Database Size=4091;Max Buffer Size = 1024;Default Lock Escalation =100;", strConnection)))
  {
     conn.Open();

     try
     {
         //your Stuff                    
     }
     catch (SqlCeException)
     {
         throw;
     }
     finally
     {
         if (conn.State == ConnectionState.Open) conn.Close();
     }
  }
}

第二：

只需将您的 excel 文件数据加载到数据表中并使用 foreach 然后将其保存到您的 sql ce 数据库文件中。

//Something like
//oledbcon
//oledb dataadapter
//datatable
// dapt.Fill(dt);

foreach(DataRow excel in dt.Rows)
{
    ceCmd.Parameters.AddWithValue("ID",excel["ID"]);
    ceCmd.ExecuteNonQuery();
}

问候