持久层框架:Db4objects [Db4objects.Db4o.dll]

public class DBContext
{
    private static IObjectContainer _db;
    public static IObjectContainer DB
    {
        get
        {
            if (_db == null)
            {
                   
                _db = Db4oFactory.OpenFile(Path);
            }
            return _db;
        }
        
    }

    public static string _path;
    public static string Path
    {
        get
        {
            if (string.IsNullOrEmpty(_path))
            {
                _path = Directory.GetCurrentDirectory() + "\\db.yap";
            }
            return _path;
        }
    }

}

在相同程序集的Model目录：

 public class Person
{
        public string Name
        { get; set; }
        public int Age
        { set; get; }
        public override string ToString()
        {
            return Name;
        }
}

 

业务逻辑层：

public class PersonBiz
{
    public static List<string> GetList()
    {
        var query = from Person it in DBContext.DB.Query<Person>() select it.Name;
        return query.ToList();
    }
    public static Person Get(string name)
    {
        var p = GetByName(name);
        if (p == null)
            Insert(name,out p);
        return p;

    }
    public static bool Insert(string name, out Person p)
    {
            p = GetByName(name);
        if (p!=null)
            return false;
        else
        {
            p = new Person();
            p.Name =name;               
            DBContext.DB.Store(p);
            DBContext.DB.Commit();
            return true;
        }

    }
    public static bool Delete(string name)
    {
        var p = GetByName(name);
        if (p == null)
            return false;
        else
        {
               

            DBContext.DB.Delete(p);
            DBContext.DB.Commit();
            return true;
        }
    }
    private static Person GetByName(string name)
    {
        return DBContext.DB.Query<Person>().Where(o => o.Name ==name).FirstOrDefault();
    }

}

Db4objects特点:CodeFirst，只要写好Model类运行后，程序会自动生成数据库结构.

[Db4objects.Db4o.dll下载]