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ListResult(client1.QueryByExample(typeof(Car)));
ListRefreshedResult(client2,
client2.QueryByExample(typeof(Car)), 2);
client1.Close();
client2.Close();
}
public static void DemonstrateLocalRollback(IObjectServer
server)
{
IObjectContainer client1 = server.OpenClient();
IObjectContainer client2 = server.OpenClient();
IObjectSet result = client1.QueryByExample(new
Car("BMW"));
Car car = (Car)result.Next();
car.Pilot = new Pilot("Someone else", 0);
client1.Store(car);
ListResult(client1.QueryByExample(new Car(null)));
ListResult(client2.QueryByExample(new Car(null)));
client1.Rollback();
client1.Ext().Refresh(car, 2);
ListResult(client1.QueryByExample(new Car(null)));
ListResult(client2.QueryByExample(new Car(null)));
client1.Close();
client2.Close();
}
public static void AccessRemoteServer()
{
IObjectServer server =
Db4oClientServer.OpenServer(Db4oClientServer.NewServerConfiguration()
,
YapFileName, ServerPort);
server.GrantAccess(ServerUser, ServerPassword);
try
{
IObjectContainer client =
Db4oClientServer.OpenClient(Db4oClientServer.NewClientConfiguration()
,
"localhost", ServerPort, ServerUser,
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ServerPassword);
// Do something with this client, or open more
clients
client.Close();
}
finally
{
server.Close();
}
}
public static void QueryRemoteServer(int port, string user,
string password)
{
IObjectContainer client =
Db4oClientServer.OpenClient(Db4oClientServer.NewClientConfiguration()
,
"localhost", port, user, password);
ListResult(client.QueryByExample(new Car(null)));
client.Close();
}
public static void DemonstrateRemoteReadCommitted(int port,
string user, string password)
{
IObjectContainer client1 =
Db4oClientServer.OpenClient(Db4oClientServer.NewClientConfiguration()
,
"localhost", port, user, password);
IObjectContainer client2 =
Db4oClientServer.OpenClient(Db4oClientServer.NewClientConfiguration()
,
"localhost", port, user, password);
Pilot pilot = new Pilot("Jenson Button", 97);
IObjectSet result = client1.QueryByExample(new
Car(null));
Car car = (Car)result.Next();
car.Pilot = pilot;
client1.Store(car);
ListResult(client1.QueryByExample(new Car(null)));
ListResult(client2.QueryByExample(new Car(null)));
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client1.Commit();
ListResult(client1.QueryByExample(new Car(null)));
ListResult(client2.QueryByExample(new Car(null)));
client1.Close();
client2.Close();
}
public static void DemonstrateRemoteRollback(int port, string
user, string password)
{
IObjectContainer client1 =
Db4oClientServer.OpenClient(Db4oClientServer.NewClientConfiguration()
,
"localhost", port, user, password);
IObjectContainer client2 =
Db4oClientServer.OpenClient(Db4oClientServer.NewClientConfiguration()
,
"localhost", port, user, password);
IObjectSet result = client1.QueryByExample(new
Car(null));
Car car = (Car)result.Next();
car.Pilot = new Pilot("Someone else", 0);
client1.Store(car);
ListResult(client1.QueryByExample(new Car(null)));
ListResult(client2.QueryByExample(new Car(null)));
client1.Rollback();
client1.Ext().Refresh(car,2);
ListResult(client1.QueryByExample(new Car(null)));
ListResult(client2.QueryByExample(new Car(null)));
client1.Close();
client2.Close();
}
}
}
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.
13. SODA Evaluations
In the SODA API chapter we already mentioned 
Evaluations
as a means of providing user-defined
custom constraints and as a means to run any arbitrary code in a SODA query. Let's have a closer
look.
13.1. Evaluation API 
The evaluation API consists of two interfaces,  IEvaluation  and  ICandidate  . Evaluation
implementations are implemented by the user and injected into a query. During a query, they will be
called from db4o with a candidate instance in order to decide whether to include it into the current
(sub-)result.
The IEvaluation  interface contains a single method only:
public void Evaluate(ICandidate candidate);
This will be called by db4o to check whether the object encapsulated by this candidate should be
included into the current candidate set.
The ICandidate  interface provides three methods:
public object GetObject();
public void Include(bool flag);
public IObjectContainer ObjectContainer();
An Evaluation implementation may call #GetObject()  to retrieve the actual object instance to be
evaluated, it may call #Include()  to instruct db4o whether or not to include this object in the current
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candidate set, and finally it may access the current database directly by calling #ObjectContainer() .
13.2. Example 
For a simple example, let's go back to our Pilot/Car implementation from the Collections chapter. Back
then, we kept a history of SensorReadout instances in a List member inside the car. Now imagine that 
we wanted to retrieve all cars that have assembled an even number of history entries. A quite
contrived and seemingly trivial example, however, it gets us into trouble: Collections are transparent to
the query API, it just 'looks through' them at their respective members.
So how can we get this done? Let's implement an Evaluation that expects the objects passed in to be
instances of type Car and checks their history size.
using Db4objects.Db4o.Query;
using Db4odoc.Tutorial.F1.Chapter4;
namespace Db4odoc.Tutorial.F1.Chapter7
{   
public class EvenHistoryEvaluation : IEvaluation
{
public void Evaluate(ICandidate candidate)
{
Car car=(Car)candidate.GetObject();
candidate.Include(car.History.Count % 2 == 0);
}
}
}
To test it, let's add two cars with history sizes of one, respectively two:
// storeCars
Pilot pilot1 = new Pilot("Michael Schumacher", 100);
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Car car1 = new Car("Ferrari");
car1.Pilot = pilot1;
car1.Snapshot();
db.Store(car1);
Pilot pilot2 = new Pilot("Rubens Barrichello", 99);
Car car2 = new Car("BMW");
car2.Pilot = pilot2;
car2.Snapshot();
car2.Snapshot();
db.Store(car2);
and run our evaluation against them:
// queryWithEvaluation
IQuery query = db.Query();
query.Constrain(typeof (Car));
query.Constrain(new EvenHistoryEvaluation());
IObjectSet result = query.Execute();
Util.ListResult(result);
OUTPUT:
1
BMW[Rubens Barrichello/99]/2
13.3. Drawbacks 
While evaluations offer you another degree of freedom for assembling queries, they come at a certain
cost: As you may already have noticed from the example, evaluations work on the fully instantiated
objects, while 'normal' queries peek into the database file directly. So there's a certain performance
penalty for the object instantiation, which is wasted if the object is not included into the candidate set.
Another restriction is that, while 'normal' queries can bypass encapsulation and access candidates'
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private members directly, evaluations are bound to use their external API, just as in the language
itself.
13.4. Conclusion 
With the introduction of evaluations we finally completed our query toolbox. Evaluations provide a
simple way of assemble arbitrary custom query building blocks, however, they come at a price.
13.5. Full source 
using System;
using System.IO;
using Db4objects.Db4o;
using Db4objects.Db4o.Query;
using Db4odoc.Tutorial.F1.Chapter4;
namespace Db4odoc.Tutorial.F1.Chapter7
{
public class EvaluationExample : Util
{
readonly static string YapFileName = Path.Combine(
Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationD
ata),
"formula1.yap"); 
public static void Main(string[] args)
{
File.Delete(YapFileName);
IObjectContainer db =
Db4oEmbedded.OpenFile(Db4oEmbedded.NewConfiguration(), YapFileName);
try
{
StoreCars(db);
QueryWithEvaluation(db);
}
finally
{
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db.Close();
}
}
public static void StoreCars(IObjectContainer db)
{
Pilot pilot1 = new Pilot("Michael Schumacher", 100);
Car car1 = new Car("Ferrari");
car1.Pilot = pilot1;
car1.Snapshot();
db.Store(car1);
Pilot pilot2 = new Pilot("Rubens Barrichello", 99);
Car car2 = new Car("BMW");
car2.Pilot = pilot2;
car2.Snapshot();
car2.Snapshot();
db.Store(car2);
}
public static void QueryWithEvaluation(IObjectContainer db)
{
IQuery query = db.Query();
query.Constrain(typeof (Car));
query.Constrain(new EvenHistoryEvaluation());
IObjectSet result = query.Execute();
Util.ListResult(result);
}
}
}
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.
14. Configuration
db4o provides a wide range of configuration methods to request special behaviour. For a complete list
of all available methods see the API documentation for the Db4objects.Db4o.Config and
Db4objects.Db4o.CS.Config namespaces. 
A more complete description of Configuration usage and scope can also be obtained from the
Reference  documentation.
Some hints around using configuration calls:
14.1. Scope 
Configuration should be created and passed to an opening ObjectContainer or ObjectServer:
IEmbeddedConfiguration config = Db4oEmbedded.NewConfiguration();
IServerConfiguration serverConfig =
Db4oClientServer.NewServerConfiguration();
IClientConfiguration clientConfig =
Db4oClientServer.NewClientConfiguration();
Appropriate configuration should be submitted when an IObjectContainer  ObjectServer is opened:
Db4oEmbedded.OpenFile(config, filename)
Db4oClientServer.OpenServer(serverConfig, filename, PORT)
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Db4oClientServer.OpenClient(clientConfig, HOST, PORT, USER, PASS);
A separate configuration instance should be created for each new IObjectContainer  ObjectServer  It is
recommended to use a factory method with all the necessary settings.
14.2. Calling Methods 
Configurations that influence the database file format will have to take place, before a database is
created, before the first #OpenXXX() call. Some examples:
IEmbeddedConfiguration conf = Db4oEmbedded.NewConfiguration();
conf.BlockSize(8);
conf.StringEncoding(new MyStringEncoding());
Configuration settings are not stored in db4o database files. Accordingly the same configuration has to
be submitted  every time an  IObjectContainer  ObjectServer  is opened.  
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