public string Update(Goods c)
{
YogaEntities ey = new YogaEntities();
Goods cc = ey.Goods.FirstOrDefault((ccc) => ccc.Id == c.Id);
if (cc == null) return string.Format("编号为{0}的商品不存在", c.Id);
cc.Price = c.Price;
cc.Name = c.Name;
return ey.SaveChanges() == 1 ? "成功" : "失败";
}
public Goods[] Search(Goods c, ref int page, int pageSize, out int totalPages)
{
YogaEntities ey = new YogaEntities();
var query = from cc in ey.Goods where cc.Name.Contains(c.Name) select cc;
if (c.Id > 0) query = query.Where((cc) => cc.Id == c.Id);
totalPages = (int)Math.Ceiling(query.Count() * 1.0 / pageSize);
if (totalPages < 1)
{
page = 0;
return null;
}
if (page == -1 || page > totalPages) page = totalPages;
else if (page < 1) page = 1;
return query.OrderBy((cc) => cc.Id).Skip((page - 1) * pageSize).Take(pageSize).ToArray();
}
/// <summary>
/// Deprecated Method for adding a new object to the Goods EntitySet. Consider using the .Add method of the associated ObjectSet<T> property instead.
/// </summary>
public void AddToGoods(Goods goods)
{
base.AddObject("Goods", goods);
}
/// <summary>
/// Create a new Goods object.
/// </summary>
/// <param name="id">Initial value of the Id property.</param>
/// <param name="name">Initial value of the Name property.</param>
/// <param name="price">Initial value of the Price property.</param>
public static Goods CreateGoods(global::System.Int32 id, global::System.String name, global::System.Double price)
{
Goods goods = new Goods();
goods.Id = id;
goods.Name = name;
goods.Price = price;
return goods;
}
public int Add(Goods a)
{
YogaEntities ey = new YogaEntities();
ey.AddToGoods(a);
return ey.SaveChanges() == 1 ? a.Id:-1;
}