ASP.NET MVC+LINQ开发一个图书销售站点(6):创建数据层
2008-03-26 14:10 敏捷的水 阅读(3618) 评论(15) 编辑 收藏 举报1. 我们在Model下存放我们系统需要的数据,首先我们创建一个数据库的Linq to Sql Class
2.选中所有的表到设计视图
3. 新建一个BookShopDBDataContext的分布类,我们在这里写一些方法和逻辑层Controller交互.
using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Xml.Linq;
using System.Collections.Generic;
namespace BookShop.Models
{
public partial class BookShopDBDataContext
{
//return all categories
public List<Category> GetAllCategory()
{
return Categories.ToList();
}
//Add Category
public void AddCategory(Category c)
{
this.Categories.InsertOnSubmit(c);
this.SubmitChanges();
}
//Edit Category
public void EditCategory(Category c)
{
this.UpdateCategory(c);
this.SubmitChanges();
}
public Category GetCategory(int id)
{
return Categories.Single(c => c.CategoryId == id);
}
//delete category
public bool DelCategory(int id)
{
//check if has used
if (Books.Any(b => b.BookCategoryId == id))
{
return false;
}
else
{
Category delCategory = this.Categories.Single(c => c.CategoryId == id);
this.Categories.DeleteOnSubmit(delCategory);
this.SubmitChanges();
return true;
}
}
}
}
using System.Data;
using System.Configuration;
using System.Linq;
using System.Xml.Linq;
using System.Collections.Generic;
namespace BookShop.Models
{
public partial class BookShopDBDataContext
{
//return all categories
public List<Category> GetAllCategory()
{
return Categories.ToList();
}
//Add Category
public void AddCategory(Category c)
{
this.Categories.InsertOnSubmit(c);
this.SubmitChanges();
}
//Edit Category
public void EditCategory(Category c)
{
this.UpdateCategory(c);
this.SubmitChanges();
}
public Category GetCategory(int id)
{
return Categories.Single(c => c.CategoryId == id);
}
//delete category
public bool DelCategory(int id)
{
//check if has used
if (Books.Any(b => b.BookCategoryId == id))
{
return false;
}
else
{
Category delCategory = this.Categories.Single(c => c.CategoryId == id);
this.Categories.DeleteOnSubmit(delCategory);
this.SubmitChanges();
return true;
}
}
}
}
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作者: 王德水
出处:http://www.cnblogs.com/cnblogsfans
版权:本文版权归作者所有,转载需经作者同意。
出处:http://www.cnblogs.com/cnblogsfans
版权:本文版权归作者所有,转载需经作者同意。