/// <summary> /// 更新一条数据 /// </summary> public void Update(BookShop.Model.Cart model) { StringBuilder strSql = new StringBuilder(); strSql.Append("update Cart set "); strSql.Append("UserId=@UserId,"); strSql.Append("BookId=@BookId,"); strSql.Append("Count=@Count "); strSql.Append(" where Id=@Id "); SqlParameter[] parameters = { new SqlParameter("@Id", SqlDbType.Int, 4), new SqlParameter("@UserId", SqlDbType.Int, 4), new SqlParameter("@BookId", SqlDbType.Int, 4), new SqlParameter("@Count", SqlDbType.Int, 4) }; parameters[0].Value = model.Id; parameters[1].Value = model.User.Id; parameters[2].Value = model.Book.Id; parameters[3].Value = model.Count; DbHelperSQL.ExecuteSql(strSql.ToString(), parameters); }
/// <summary> /// 更新一条数据 /// </summary> public bool Update(BookShop.Model.Cart model) { StringBuilder strSql = new StringBuilder(); strSql.Append("update Cart set "); strSql.Append("UserId=@UserId,"); strSql.Append("BookId=@BookId,"); strSql.Append("Count=@Count"); strSql.Append(" where Id=@Id"); SqlParameter[] parameters = { new SqlParameter("@UserId", SqlDbType.Int, 4), new SqlParameter("@BookId", SqlDbType.Int, 4), new SqlParameter("@Count", SqlDbType.Int, 4), new SqlParameter("@Id", SqlDbType.Int, 4) }; parameters[0].Value = model.UserId; parameters[1].Value = model.BookId; parameters[2].Value = model.Count; parameters[3].Value = model.Id; int rows = DbHelperSQL.ExecuteSql(strSql.ToString(), parameters); if (rows > 0) { return(true); } else { return(false); } }
/// <summary> /// 增加一条数据 /// </summary> public int Add(BookShop.Model.Cart model) { StringBuilder strSql = new StringBuilder(); strSql.Append("insert into Cart("); strSql.Append("UserId,BookId,Count )"); strSql.Append(" values ("); strSql.Append("@UserId,@BookId,@Count)"); strSql.Append(";select @@IDENTITY"); SqlParameter[] parameters = { new SqlParameter("@UserId", SqlDbType.Int, 4), new SqlParameter("@BookId", SqlDbType.Int, 4), new SqlParameter("@Count", SqlDbType.Int, 4) } ; parameters[0].Value = model.User.Id; parameters[1].Value = model.Book.Id; parameters[2].Value = model.Count; object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters); if (obj == null) { return(1); } else { return(Convert.ToInt32(obj)); } }
/// <summary> /// 得到一个对象实体 /// </summary> public BookShop.Model.Cart DataRowToModel(DataRow row) { BookShop.Model.Cart model = new BookShop.Model.Cart(); if (row != null) { if (row["Id"] != null && row["Id"].ToString() != "") { model.Id = int.Parse(row["Id"].ToString()); } if (row["UserId"] != null && row["UserId"].ToString() != "") { model.UserId = int.Parse(row["UserId"].ToString()); } if (row["BookId"] != null && row["BookId"].ToString() != "") { int bookid = int.Parse(row["BookId"].ToString()); model.Book = new BooksDAL().GetModel(bookid); } if (row["Count"] != null && row["Count"].ToString() != "") { model.Count = int.Parse(row["Count"].ToString()); } } return model; }
//------------------------------ /// <summary> /// 查询一下当前用户是否已经选择了该商品。 /// </summary> /// <param name="bookId"></param> /// <param name="userId"></param> /// <returns></returns> public Model.Cart GetCartModel(int bookId, int userId) { StringBuilder strSql = new StringBuilder(); strSql.Append("select top 1 Id,UserId,BookId,Count from Cart "); strSql.Append(" where BookId=@BookId and UserId=@UserId "); SqlParameter[] parameters = { new SqlParameter("@BookId", SqlDbType.Int, 4), new SqlParameter("@UserId", SqlDbType.Int, 4) }; parameters[0].Value = bookId; parameters[1].Value = userId; BookShop.Model.Cart model = new BookShop.Model.Cart(); DataSet ds = DbHelperSQL.Query(strSql.ToString(), parameters); if (ds.Tables[0].Rows.Count > 0) { if (ds.Tables[0].Rows[0]["Id"].ToString() != "") { model.Id = int.Parse(ds.Tables[0].Rows[0]["Id"].ToString()); } if (ds.Tables[0].Rows[0]["UserId"].ToString() != "") { int UserId = int.Parse(ds.Tables[0].Rows[0]["UserId"].ToString()); model.User = userServices.GetModel(UserId); } if (ds.Tables[0].Rows[0]["BookId"].ToString() != "") { int BookId = int.Parse(ds.Tables[0].Rows[0]["BookId"].ToString()); model.Book = bookServices.GetModel(BookId); } if (ds.Tables[0].Rows[0]["Count"].ToString() != "") { model.Count = int.Parse(ds.Tables[0].Rows[0]["Count"].ToString()); } return(model); } else { return(null); } }
/// <summary> /// 增加一条数据 /// </summary> public int Add(BookShop.Model.Cart model) { StringBuilder strSql = new StringBuilder(); strSql.Append("insert into Cart("); strSql.Append("UserId,BookId,Count )"); strSql.Append(" values ("); strSql.Append("@UserId,@BookId,@Count)"); strSql.Append(";select @@IDENTITY"); SqlParameter[] parameters = { new SqlParameter("@UserId", SqlDbType.Int, 4), new SqlParameter("@BookId", SqlDbType.Int, 4), new SqlParameter("@Count", SqlDbType.Int, 4) } ; //3层时候 也早就可以从一个对象 点出另外一个对象的数据。 //珍惜可以安静的 好好写代码的时候。有很多时候 看着能写代码 //其实 不是的。需要一个不错的环境 环境的要求还挺高的 // 一个表里面有多个 外键的时候 他们的关系 怎么样来理解 //这里 实体类型的关系 是被改造过的。。 先一点一点的全部真的弄懂。 //一个用户一个购物车 parameters[0].Value = model.User.Id; parameters[1].Value = model.Book.Id; parameters[2].Value = model.Count; object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters); if (obj == null) { return(1); } else { return(Convert.ToInt32(obj)); } }
/// <summary> /// 向购物车中添加商品信息。 /// </summary> protected void AddCart() { if (!string.IsNullOrEmpty(Request.QueryString["id"])) { int bookId = 0; if (!int.TryParse(Request.QueryString["id"], out bookId)) { Response.Redirect("/showinfo.aspx?msg=" + Server.UrlEncode("参数错误") + "&url=BookList.aspx" + "&txt=" + Server.UrlEncode("返回图书列表")); } else { BLL.BookManager bll = new BookShop.BLL.BookManager(); Model.Book model = bll.GetModel(bookId);//根据传递过来的书的编号查找该书. if (model != null) { BLL.CartManager cartBll = new BookShop.BLL.CartManager(); int userId = ((Model.User)Session["user"]).Id; //得到了当前登录用户的编号. Model.Cart cartModel = cartBll.GetModel(model.Id, userId); //根据用户的编号,与书的编号,找出购物车中的商品项. if (cartModel == null) //如果该条件成立,向购物车表中插入一条记录 { Model.Cart ModelCart = new BookShop.Model.Cart(); ModelCart.User = (Model.User)Session["user"]; ModelCart.Book = model; ModelCart.Count = 1; cartBll.Add(ModelCart); } else//更新该商品项的数量 { cartModel.Count = cartModel.Count + 1; cartBll.Update(cartModel); } } else { Response.Redirect("/showinfo.aspx?msg=" + Server.UrlEncode("该书不存在") + "&url=BookList.aspx" + "&txt=" + Server.UrlEncode("返回图书列表")); } } } }
/// <summary> /// 得到一个对象实体 /// </summary> public BookShop.Model.Cart DataRowToModel(DataRow row) { BookShop.Model.Cart model = new BookShop.Model.Cart(); if (row != null) { if (row["Id"] != null && row["Id"].ToString() != "") { model.Id = int.Parse(row["Id"].ToString()); } if (row["UserId"] != null && row["UserId"].ToString() != "") { model.UserId = int.Parse(row["UserId"].ToString()); } if (row["BookId"] != null && row["BookId"].ToString() != "") { model.BookId = int.Parse(row["BookId"].ToString()); } if (row["Count"] != null && row["Count"].ToString() != "") { model.Count = int.Parse(row["Count"].ToString()); } } return(model); }
/// <summary> /// 得到一个对象实体 /// </summary> public BookShop.Model.Cart GetModel(int Id) { StringBuilder strSql = new StringBuilder(); strSql.Append("select top 1 Id,UserId,BookId,Count from Cart "); strSql.Append(" where Id=@Id"); SqlParameter[] parameters = { new SqlParameter("@Id", SqlDbType.Int, 4) }; parameters[0].Value = Id; BookShop.Model.Cart model = new BookShop.Model.Cart(); DataSet ds = DbHelperSQL.Query(strSql.ToString(), parameters); if (ds.Tables[0].Rows.Count > 0) { return(DataRowToModel(ds.Tables[0].Rows[0])); } else { return(null); } }
/// <summary> /// 得到一个对象实体 /// </summary> public BookShop.Model.Cart GetModel(int userId, int bookId) { StringBuilder strSql = new StringBuilder(); strSql.Append("select top 1 Id,UserId,BookId,Count from Cart "); strSql.Append(" where UserId=@UserId and BookId=@BookId"); SqlParameter[] parameters = { new SqlParameter("@UserId", SqlDbType.Int,4), new SqlParameter("@BookId", SqlDbType.Int,4) }; parameters[0].Value = userId; parameters[1].Value = bookId; BookShop.Model.Cart model = new BookShop.Model.Cart(); DataSet ds = DbHelperSQL.Query(strSql.ToString(), parameters); if (ds.Tables[0].Rows.Count > 0) { return DataRowToModel(ds.Tables[0].Rows[0]); } else { return null; } }