/// <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;
}
}