ef4.0和ef5.0增删改查的写法区别及执行Sql的方法

public T AddEntity(T entity) 

{

    //EF4.0的写法  

    添加实体

    //db.CreateObjectSet<T>().AddObject(entity);

    //EF5.0的写法

    db.Entry<T>(entity).State = EntityState.Added;

    //下面的写法统一

    db.SaveChanges();

    return entity;

}

public bool UpdateEntity(T entity)

{

    //EF4.0的写法

    //db.CreateObjectSet<T>().Addach(entity);

    //db.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified);

    //EF5.0的写法 

   db.Set<T>().Attach(entity); 

   db.Entry<T>(entity).State = EntityState.Modified; 

   return db.SaveChanges() > 0; 

}

public bool DeleteEntity(T entity)

{

    //EF4.0的写法 

   //db.CreateObjectSet<T>().Addach(entity);

   //db.ObjectStateManager.ChangeObjectState(entity, EntityState.Deleted);

   //EF5.0的写法

   db.Set<T>().Attach(entity);

   db.Entry<T>(entity).State = EntityState.Deleted;

   return db.SaveChanges() > 0;

}

public IQueryable<T> LoadEntities(Func<T, bool> whereLambda)

{

    //EF4.0的写法

    //return db.CreateObjectSet<T>().Where<T>(whereLambda).AsQueryable();

    //EF5.0的写法

    return db.Set<T>().Where<T>(whereLambda).AsQueryable();

}

执行SQL语句

// EF4.0的写法

// int ExcuteSql(string strSql, ObjectParameter[] parameters);

return EFContextFactory.GetCurrentDbContext().ExecuteFunction(strSql, parameters);

// EF5.0的写法

  int ExcuteSql( string  strSql, DbParameter[] parameters);

return DEFContextFactory.GetCurrentDbContext().ExecuteSqlCommand(strSql, parameters);