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public static void RetrieveAllPilots(IObjectContainer db)
{
IObjectSet results = db.QueryByExample(typeof(Pilot));
ListResult(results);
}
public static void RetrieveAllCars(IObjectContainer db)
{
IObjectSet results = db.QueryByExample(typeof(Car));
ListResult(results);
}
public class RetrieveCarsByPilotNamePredicate : Predicate
{
readonly string _pilotName;
public RetrieveCarsByPilotNamePredicate(string pilotName)
{
_pilotName = pilotName;
}
public bool Match(Car candidate)
{
return candidate.Pilot.Name == _pilotName;
}
}
public static void
RetrieveCarsByPilotNameNative(IObjectContainer db)
{
string pilotName = "Rubens Barrichello";
IObjectSet results = db.Query(new
RetrieveCarsByPilotNamePredicate(pilotName));
ListResult(results);
}
public static void UpdateCar(IObjectContainer db)
{
IObjectSet result = db.QueryByExample(new
Car("Ferrari"));
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Car found = (Car)result.Next();
found.Pilot = new Pilot("Somebody else", 0);
db.Store(found);
result = db.QueryByExample(new Car("Ferrari"));
ListResult(result);
}
public static void UpdatePilotSingleSession(IObjectContainer
db)
{
IObjectSet result = db.QueryByExample(new
Car("Ferrari"));
Car found = (Car)result.Next();
found.Pilot.AddPoints(1);
db.Store(found);
result = db.QueryByExample(new Car("Ferrari"));
ListResult(result);
}
public static void
UpdatePilotSeparateSessionsPart1(IObjectContainer db)
{
IObjectSet result = db.QueryByExample(new
Car("Ferrari"));
Car found = (Car)result.Next();
found.Pilot.AddPoints(1);
db.Store(found);
}
public static void
UpdatePilotSeparateSessionsPart2(IObjectContainer db)
{
IObjectSet result = db.QueryByExample(new
Car("Ferrari"));
ListResult(result);
}
public static void UpdatePilotSeparateSessionsImprovedPart1()
{
IEmbeddedConfiguration config =
Db4oEmbedded.NewConfiguration();
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config.Common.ObjectClass(typeof(Car)).CascadeOnUpdate(true);         
IObjectContainer db = Db4oEmbedded.OpenFile(config, YapFileName);
IObjectSet result = db.QueryByExample(new
Car("Ferrari"));
Car found = (Car)result.Next();
found.Pilot.AddPoints(1);
db.Store(found);
db.Close();
}
public static void
UpdatePilotSeparateSessionsImprovedPart2(IObjectContainer db)
{
IObjectSet result = db.QueryByExample(new
Car("Ferrari"));
ListResult(result);
}
public static void DeleteFlat(IObjectContainer db)
{
IObjectSet result = db.QueryByExample(new
Car("Ferrari"));
Car found = (Car)result.Next();
db.Delete(found);
result = db.QueryByExample(new Car(null));
ListResult(result);
}
public static void DeleteDeep()
{
IEmbeddedConfiguration config =
Db4oEmbedded.NewConfiguration();
config.Common.ObjectClass(typeof(Car)).CascadeOnDelete(true);         
IObjectContainer db = Db4oEmbedded.OpenFile(config, YapFileName);
IObjectSet result = db.QueryByExample(new Car("BMW"));
Car found = (Car)result.Next();
db.Delete(found);
result = db.QueryByExample(new Car(null));
ListResult(result);
db.Close();
}
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public static void DeleteDeepRevisited()
{
IEmbeddedConfiguration config =
Db4oEmbedded.NewConfiguration();
config.Common.ObjectClass(typeof(Car)).CascadeOnDelete(true);         
IObjectContainer db = Db4oEmbedded.OpenFile(config, YapFileName);
IObjectSet result = db.QueryByExample(new Pilot("Michael
Schumacher", 0));
Pilot pilot = (Pilot)result.Next();
Car car1 = new Car("Ferrari");
Car car2 = new Car("BMW");
car1.Pilot = pilot;
car2.Pilot = pilot;
db.Store(car1);
db.Store(car2);
db.Delete(car2);
result = db.QueryByExample(new Car(null));
ListResult(result);
db.Close();
}
}
}
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.
6. Collections and Arrays
We will slowly move towards real-time data processing now by installing sensors to our car and
collecting their output.
using System;
using System.Text;
namespace Db4odoc.Tutorial.F1.Chapter4
{  
public class SensorReadout
{
double[] _values;
DateTime _time;
Car _car;
public SensorReadout(double[] values, DateTime time, Car car)
{
_values = values;
_time = time;
_car = car;
}
public Car Car
{
get
{
return _car;
}
}
public DateTime Time
{
get
{
return _time;
}
}
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public int NumValues
{
get
{
return _values.Length;
}
}
public double[] Values
{
get
{
return _values;
}
}
public double GetValue(int idx)
{
return _values[idx];
}
override public string ToString()
{
StringBuilder builder = new StringBuilder();
builder.Append(_car);
builder.Append(" : ");
builder.Append(_time.TimeOfDay);
builder.Append(" : ");
for (int i=0; i<_values.Length; ++i)
{
if (i > 0)
{
builder.Append(", ");
}
builder.Append(_values[i]);
}
return builder.ToString();
}
}
}
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A car may produce its current sensor readout when requested and keep a list of readouts collected
during a race.
using System;
using System.Collections;
namespace Db4odoc.Tutorial.F1.Chapter4
{
public class Car
{
string _model;
Pilot _pilot;
IList _history;
public Car(string model) : this(model, new ArrayList())
{
}
public Car(string model, IList history)
{
_model = model;
_pilot = null;
_history = history;
}
public Pilot Pilot
{
get
{
return _pilot;
}
set
{
_pilot = value;
}
}
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public string Model
{
get
{
return _model;
}
}
public IList History
{
get
{
return _history;
}
}
public void Snapshot()
{
_history.Add(new SensorReadout(Poll(), DateTime.Now,
this));
}
protected double[] Poll()
{
int factor = _history.Count + 1;
return new double[] { 0.1d*factor, 0.2d*factor,
0.3d*factor };
}
override public string ToString()
{
return string.Format("{0}[{1}]/{2}", _model, _pilot,
_history.Count);
}
}
}
We will constrain ourselves to rather static data at the moment and add flexibility during the next
chapters.
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6.1. Storing 
This should be familiar by now.
// storeFirstCar
Car car1 = new Car("Ferrari");
Pilot pilot1 = new Pilot("Michael Schumacher", 100);
car1.Pilot = pilot1;
db.Store(car1);
The second car will take two snapshots immediately at startup.
// storeSecondCar
Pilot pilot2 = new Pilot("Rubens Barrichello", 99);
Car car2 = new Car("BMW");
car2.Pilot = pilot2;
car2.Snapshot();
car2.Snapshot();
db.Store(car2);
6.2. Retrieving 
6.2.1. QBE 
First let us verify that we indeed have taken snapshots.
// retrieveAllSensorReadout
IObjectSet result = db.QueryByExample(typeof(SensorReadout));
ListResult(result);
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OUTPUT:
2
BMW[Rubens Barrichello/99]/2 : 1244836444014 : 0.1,0.2,0.3
BMW[Rubens Barrichello/99]/2 : 1244836444014 : 0.2,0.4,0.6
As a prototype for an array, we provide an array of the same type, containing only the values we
expect the result to contain.
// retrieveSensorReadoutQBE
SensorReadout proto = new SensorReadout(new double[] { 0.3, 0.1 },
DateTime.MinValue, null);
IObjectSet result = db.QueryByExample(proto);
ListResult(result);
OUTPUT:
1
BMW[Rubens Barrichello/99]/2 : 1244836444014 : 0.1,0.2,0.3
Note that the actual position of the given elements in the prototype array is irrelevant.
To retrieve a car by its stored sensor readouts, we install a history containing the sought-after values.
// retrieveCarQBE
SensorReadout protoReadout = new SensorReadout(new double[] { 0.6,
0.2 }, DateTime.MinValue, null);
IList protoHistory = new ArrayList();
protoHistory.Add(protoReadout);
Car protoCar = new Car(null, protoHistory);
IObjectSet result = db.QueryByExample(protoCar);
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