动态创建.mdf / .sdf数据库

Question

How can I with "code" create a new .mdf/.sdf database?

I've tried this: http://support.microsoft.com/kb/307283

All it does is fail on the ConnectionString. Since I have no connection to a file that exists before I create it, how can I only connect to the SQL Express Server just to create a mdf/sdf database?

I want to be able to just connect to the server and create the file, from there it probably will be easier to create the tables and such.

Any suggestions?

Answer 1

public static void CreateSqlDatabase(string filename)
{
    string databaseName = System.IO.Path.GetFileNameWithoutExtension(filename);
    using (var connection = new System.Data.SqlClient.SqlConnection(
        "Data Source=.\\sqlexpress;Initial Catalog=tempdb; Integrated Security=true;User Instance=True;"))
    {
        connection.Open();
        using (var command = connection.CreateCommand())
        {
            command.CommandText =
                String.Format("CREATE DATABASE {0} ON PRIMARY (NAME={0}, FILENAME='{1}')", databaseName, filename);
            command.ExecuteNonQuery();

            command.CommandText =
                String.Format("EXEC sp_detach_db '{0}', 'true'", databaseName);
            command.ExecuteNonQuery();
        }
    }
}

Change Catalog=tempdb to Catalog=master , its good worked

Sample use:

var filename = System.IO.Path.Combine("D:\\", "testdb.mdf");
if (!System.IO.File.Exists(filename))
{
    CreateSqlDatabase(filename);
}

Answer 2

关于.sdf文件（SQL Server CE），您可以使用SqlCeEngine类创建新数据库，如本MSDN文章中所述 。

Answer 3

Make sure you have a valid connection string.

The database/catalog that you need must be set to a valid database, usually this can be the "master" which is always available and since you will be using master to create a database.

Answer 4

If you need to create a database from scratch programmatically i normal go into the SQL Server Management Studio and create it through the gui in a first step. But instead of clicking on the OK button in the bottom right, i click on the Script button in the top toolbar. This will give me a complete sql script for creating the database i'd like to have. Then i can alter the script and change the parts i'd like dynamically.

Answer 5

I suppose the problem is in the ConnectionString. It should point to the valid instance of the master db (as in the article you refer to). Make sure it is correct, and it should work.

Answer 6

Use a connectionString with InitialCatalog = master . Since only master has default access to create a database.

Answer 7

Create .sdf database

using System.Data.SqlServerCe;
using System.IO;
  string folderPath="D:\\Compact_DB"
  string connectionString;
  string fileName =folderPath+"\\School.sdf";
  string password = "12345";

  if (File.Exists(fileName))
  {
    File.Delete(fileName);
  }

  connectionString = string.Format("DataSource=\"{0}\"; Password='{1}'",    fileName, password);
  SqlCeEngine obj_ceEngine = new SqlCeEngine(connectionString);
  obj_ceEngine.CreateDatabase();