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To open a SQL Server database:

var db = Database.OpenConnection("data source=.;initial catalog=Xyz;etc");

To open a SQL Server Compact Edition 4.0 database

var db = Database.OpenFile("mydb.sdf");

You can specify a database for Simple.Data in the connectionStrings section of the config file:

 

<connectionStrings>
  <add name="Simple.Data.Properties.Settings.DefaultConnectionString"
       connectionString="data source=.;initial catalog=Simple;integrated security=true"
       providerName="System.Data.SqlClient" />
</connectionStrings>

 

Then you can open this database with the parameterless Open method:

var db = Database.Open();

or use a single instance provided as default:

Database.Default.Users.FindById(1);

Simple.Data holds no open connections to the database, so you can keep the db object returned from the Open methods hanging around without worrying.

也就是Simple.Data无须手动关闭数据库连接，它本身就不会保持数据库连接。