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How to setup a default database?

DefaultDatabase property allows you to setup a default database for a DocumentStore. Implication of setting up a default database is that each time you access Commands or create a Session without explicitly passing database on which they should operate on then default database is assumed.

Example I

// without specifying `DefaultDatabase`
// created `DatabaseCommands` or opened `Sessions`
// will work on `<system>` database by default
// if no database is passed explicitly
using (IDocumentStore store = new DocumentStore
	                   {
		                   Url = "http://localhost:8080/"
	                   }.Initialize())
{
	IDatabaseCommands commands = store.DatabaseCommands;
	using (IDocumentSession session = store.OpenSession())
	{
		// ...
	}

	IDatabaseCommands northwindCommands = commands.ForDatabase("Northwind");
	using (IDocumentSession northwindSession = store.OpenSession("Northwind"))
	{
		// ...
	}
}

Example II

// when `DefaultDatabase` is set to `Northwind`
// created `DatabaseCommands` or opened `Sessions`
// will work on `Northwind` database by default
// if no database is passed explicitly
using (IDocumentStore store = new DocumentStore
{
	Url = "http://localhost:8080/",
	DefaultDatabase = "Northwind"
}.Initialize())
{
	IDatabaseCommands northwindCommands = store.DatabaseCommands;
	using (IDocumentSession northwindSession = store.OpenSession())
	{
		// ...
	}

	IDatabaseCommands adventureWorksCommands = northwindCommands.ForDatabase("AdventureWorks");
	using (IDocumentSession adventureWorksSession = store.OpenSession("AdventureWorks"))
	{
		// ...
	}

	IDatabaseCommands systemCommands = northwindCommands.ForSystemDatabase();
	using (IDocumentSession systemSession = store.OpenSession(Constants.SystemDatabase))
	{
		// ..
	}
}

Remarks

Note

By default value of DefaultDatabase property in DocumentStore is null which means that actions will be executed on <system> database.