ASP.NET MVC5+EF6+EasyUI 后台管理系统（5）-EF增删改查

系列目录

前言

为了符合后面更新后的重构系统，文章于2016-11-1日重写

回顾上一节的解决方案，我们看出了解决方案中类库的关系

这里要说明一点MVC!=三层

他们大约是这样的一种关系

代码实现

上一节我们在EF添加了一个实体，这次我们来看看怎么操作这个实体，下面我们创建IDAL,DAL,IBLL,BLL的代码：

新建一个SysSampleController的控制器：不需要写什么代码，系统自动生成Index方法：分别在各层添加下列代码：

using System;
using System.Linq;
using Apps.IDAL;
using Apps.Models;
using System.Data;

namespace Apps.DAL
{
    public class SysSampleRepository : ISysSampleRepository, IDisposable
    {
        /// <summary>
    /// 获取列表
    ///
</summary>
        /// <param name="db">数据库上下文</param>
        /// <returns>数据列表</returns>
        public IQueryable<SysSample>GetList(DBContainer db)
        {
            IQueryable<SysSample>
                list = db.SysSample.AsQueryable();
            return list;
        }
        /// <summary>
            /// 创建一个实体
            ///
        </summary>
        /// <param name="db">数据库上下文</param>
        /// <param name="entity">实体</param>
        public int Create(SysSample entity)
        {
            using (DBContainer db = new DBContainer())
            {
                db.Set<SysSample>().Add(entity);
                return db.SaveChanges();
            }
        }
        /// <summary>
            /// 删除一个实体
            ///
        </summary>
        /// <param name="db">数据库上下文</param>
        /// <param name="entity">主键ID</param>
        public int Delete(string id)
        {
            using (DBContainer db = new DBContainer())
            {
                SysSample entity = db.SysSample.SingleOrDefault(a => a.Id == id);
                db.Set<SysSample>().Remove(entity);
                return db.SaveChanges() > ;
            }
        }

        /// <summary>
            /// 修改一个实体
            ///
        </summary>
        /// <param name="db">数据库上下文</param>
        /// <param name="entity">实体</param>
        public int Edit(SysSample entity)
        {
            using (DBContainer db = new DBContainer())
            {
                db.Set<entity>().Attach(entity);
                db.Entry<SysSample>(entity).State = EntityState.Modified;
                return db.SaveChanges();
            }
        }
        /// <summary>
            /// 获得一个实体
            ///
        </summary>
        /// <param name="id">id</param>
        /// <returns>实体</returns>
        public SysSample GetById(string id)
        {
            using (DBContainer db = new DBContainer())
            {
                return db.SysSample.SingleOrDefault(a => a.Id == id);
            }
        }
        /// <summary>
            /// 判断一个实体是否存在
            ///
        </summary>
        /// <param name="id">id</param>
        /// <returns>是否存在 true or false</returns>
        public bool IsExist(string id)
        {
            using (DBContainer db = new DBContainer())
            {
                SysSample entity = GetById(id);
                if (entity != null)
                    return true;
                return false;
            }
        }
        public void Dispose()
        {

        }
    }
}

DAL层-SysSampleRepository

using Apps.Models;
using System.Linq;
namespace Apps.IDAL
{
    public interface ISysSampleRepository
    {
        /// <summary>
        /// 获取列表
        /// </summary>
        /// <param name="db">数据库上下文</param>
        /// <returns>数据列表</returns>
        IQueryable<SysSample> GetList(DBContainer db);
        /// <summary>
        /// 创建一个实体
        /// </summary>
        /// <param name="entity">实体</param>
        int Create(SysSample entity);
        /// <summary>
        /// 删除一个实体
        /// </summary>
        /// <param name="entity">主键ID</param>
        int Delete(string id);

        /// <summary>
        /// 修改一个实体
        /// </summary>
        /// <param name="entity">实体</param>
        int Edit(SysSample entity);
        /// <summary>
        /// 获得一个实体
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>实体</returns>
        SysSample GetById(string id);
        /// <summary>
        /// 判断一个实体是否存在
        /// </summary>
        bool IsExist(string id);
    }
}

IDAL层-ISysSampleRepository

using System.Collections.Generic;
using App.Common;
using App.Models.Sys;

namespace App.IBLL
{

    public interface ISysSampleBLL
    {
        /// <summary>
        /// 获取列表
        /// </summary>
        /// <param name="pager">JQgrid分页</param>
        /// <param name="queryStr">搜索条件</param>
        /// <returns>列表</returns>
        List<SysSampleModel> GetList(ref GridPager pager, string queryStr);
        /// <summary>
        /// 创建一个实体
        /// </summary>
        /// <param name="errors">持久的错误信息</param>
        /// <param name="model">模型</param>
        /// <returns>是否成功</returns>
        bool Create(ref ValidationErrors errors, SysSampleModel model);
        /// <summary>
        /// 删除一个实体
        /// </summary>
        /// <param name="errors">持久的错误信息</param>
        /// <param name="id">id</param>
        /// <returns>是否成功</returns>
        bool Delete(ref ValidationErrors errors, string id);
        /// <summary>
        /// 删除多个实体，中断将回滚
        /// </summary>
        /// <param name="errors">持久的错误信息</param>
        /// <param name="deleteCollection">主键数组集合</param>
        /// <returns>是否成功</returns>
        bool Delete(ref ValidationErrors errors, string[] deleteCollection);
        /// <summary>
        /// 修改一个实体
        /// </summary>
        /// <param name="errors">持久的错误信息</param>
        /// <param name="model">模型</param>
        /// <returns>是否成功</returns>
        bool Edit(ref ValidationErrors errors, SysSampleModel model);
        /// <summary>
        /// 根据ID获得一个Model实体
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>Model实体</returns>
        SysSampleModel GetById(string id);
        /// <summary>
        /// 判断是否存在实体
        /// </summary>
        /// <param name="id">主键ID</param>
        /// <returns>是否存在</returns>
        bool IsExist(string id);
    }
}

ISysSampleBLL

using System;
using System.Collections.Generic;
using System.Linq;
using Apps.Models;
using Apps.Common;
using Apps.IBLL;
using Apps.IDAL;
using Apps.DAL;

namespace Apps.BLL
{
    public class SysSampleBLL :ISysSampleBLL
    {
        DBContainer db = new DBContainer();

        ISysSampleRepository Rep = new SysSampleRepository();

        /// <summary>
        /// 获取列表
        /// </summary>
        /// <param name="pager">JQgrid分页</param>
        /// <param name="queryStr">搜索条件</param>
        /// <returns>列表</returns>
        public List<SysSample> GetList(string queryStr)
        {

            IQueryable<SysSample> queryData =Rep.GetList(db);

            return queryData.ToList();
        }

        /// <summary>
        /// 创建一个实体
        /// </summary>
        /// <param name="errors">持久的错误信息</param>
        /// <param name="model">模型</param>
        /// <returns>是否成功</returns>
        public bool Create(SysSample entity)
        {
            try
            {
                if (Rep.Create(entity) == )
                {
                    return true;
                }
                else
                {

                    return false;
                }
            }
            catch (Exception ex)
            {
                //ExceptionHander.WriteException(ex);
                return false;
            }
        }
        /// <summary>
        /// 删除一个实体
        /// </summary>
        /// <param name="errors">持久的错误信息</param>
        /// <param name="id">id</param>
        /// <returns>是否成功</returns>
        public bool Delete(string id)
        {
            try
            {
                if (Rep.Delete(id) == )
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                //ExceptionHander.WriteException(ex);
                return false;
            }
        }

        /// <summary>
        /// 修改一个实体
        /// </summary>
        /// <param name="errors">持久的错误信息</param>
        /// <param name="model">模型</param>
        /// <returns>是否成功</returns>
        public bool Edit(SysSample entity)
        {
            try
            {
                if (Rep.Edit(entity) == )
                {
                    return true;
                }
                else
                {

                    return false;
                }

            }
            catch (Exception ex)
            {

                //ExceptionHander.WriteException(ex);
                return false;
            }
        }
        /// <summary>
        /// 判断是否存在实体
        /// </summary>
        /// <param name="id">主键ID</param>
        /// <returns>是否存在</returns>
        public bool IsExists(string id)
        {
            if (db.SysSample.SingleOrDefault(a => a.Id == id) != null)
            {
                return true;
            }
            return false;
        }
        /// <summary>
        /// 根据ID获得一个实体
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>实体</returns>
        public SysSample GetById(string id)
        {
            if (IsExist(id))
            {
                SysSample entity = Rep.GetById(id);

                return entity;
            }
            else
            {
                return null;
            }
        }

        /// <summary>
        /// 判断一个实体是否存在
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>是否存在 true or false</returns>
        public bool IsExist(string id)
        {
            return Rep.IsExist(id);
        }
    }
}

SysSampleBLL

@model IEnumerable<App.Models.SysSample>

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <p>
        @Html.ActionLink("Create New", "Create")
    </p>
    <table>
        <tr>
            <th>
                @Html.DisplayNameFor(model => model.Name)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Age)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Bir)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Photo)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Note)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.CreateTime)
            </th>
            <th></th>
        </tr>

    @foreach (var item in Model) {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Name)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Age)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Bir)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Photo)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Note)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.CreateTime)
            </td>
            <td>
                @Html.ActionLink("Edit", "Edit", new { id=item.Id }) |
                @Html.ActionLink("Details", "Details", new { id=item.Id }) |
                @Html.ActionLink("Delete", "Delete", new { id=item.Id })
            </td>
        </tr>
    }

    </table>
</body>
</html>

Index.cshtml

我们往数据库插入几条记录这时你应该看到效果了