Establishing connection with local SQL Server database file

Question

I am trying to set up connection with a SQL Server database file AdventureWorksDW2008R2_Data.mdf located on my D drive.

I have used connection string :

Server=.\SQLExpress;AttachDbFilename=D:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\AdventureWorksDW2008R2_Data.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True;"

However, I cannot establish connection.

I aim to retrieve the number of employees in a particular department from the database (tables employee and department are present in the db).

Can anyone highlight or suggest steps that would allow me do that?

Answer 1

use following code to connect:

public static void Main()
        {
            try
            {
                string connectString =
                    "Server=IRIS-CSG-108\\SQLEXPRESS;" +
                    "Integrated Security=true";
                SqlConnectionStringBuilder builder =
                    new SqlConnectionStringBuilder(connectString);
                Console.WriteLine("Original: " + builder.ConnectionString);
                Console.WriteLine("AttachDBFileName={0}", builder.AttachDBFilename);

                builder.AttachDBFilename = @"E:\\TCMS.mdf";
                Console.WriteLine("Modified: " + builder.ConnectionString);

                using (SqlConnection connection = new SqlConnection(builder.ConnectionString))
                {
                    connection.Open();
                    // Now use the open connection.
                    Console.WriteLine("Database = " + connection.Database);

                    DataSet ds = new DataSet();
                    SqlDataAdapter da = new SqlDataAdapter("Select * from mytable", connection);
                    da.Fill(ds);
                }
                Console.WriteLine("Press any key to finish.");
                Console.ReadLine();


            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

Answer 2

If you are using the sample DataBase from your Sql Server Management Studio, then i will not work. Close your Sql Management Studio if you are working..

Answer 3

将mdf文件添加到d：\\中的新文件夹中，然后尝试以下操作：Data Source =。\\ SQLEXPRESS; AttachDbFileName = d：\\ data \\ Customers.mdf; Integrated Security = True; User Instance = True可能存在读取问题路径。