DB4Obeject简单应用

首先要引入必要的名字空间：
using System.IO;
using Db4objects.Db4o;

打开数据库：
IObjectContainer db = Db4oFactory.OpenFile(Util.YapFileName);//文件名Util.YapFileName，没找到文件的话会自动创建

存储一个对象：
Pilot pilot1 = new Pilot("Michael Schumacher", 100);
db.Set(pilot1);//执行存储，数据库中可以没有指定的Pilot类型，当成容器往里面装就行

按类型读取对象：
IObjectSet result = db.Get(typeof(Pilot));
foreach (object o in result)
{
       Pilot p = (Pilot)o;
}
按属性读取对象：
Pilot proto = new Pilot(null, 100);//找到分数为一百的车手，null为前一个属性string的默认值
IObjectSet result = db.Get(proto);

更新对象：
IObjectSet result = db.Get(new Pilot("Michael Schumacher", 0));
Pilot found = (Pilot)result.Next();
found.AddPoints(11);
db.Set(found);

删除对象：
IObjectSet result = db.Get(new Pilot("Michael Schumacher", 0));
Pilot found = (Pilot)result.Next();
db.Delete(found);

附：
    public class Pilot
    {
        string _name;
        int _points;
        
        public Pilot(string name, int points)
        {
            _name = name;
            _points = points;
        }
        
        public string Name
        {
            get
            {
                return _name;
            }
        }
        
        public int Points
        {
            get
            {
                return _points;
            }
        }   
        
        public void AddPoints(int points)
        {
            _points += points;
        }    
        
        override public string ToString()
        {
            return string.Format("{0}/{1}", _name, _points);
        }
    }