ASP.NET MVC5+EF6+LayUI实战教程，通用后台管理系统框架（7）- EF增删改查

前言

上一节创建了实体数据库，这次我们来看看怎么操作这个实体

代码实现

新建一个UserInfoController的控制器：不需要写什么代码，系统自动生成Index方法：

创建IDAL,DAL,IBLL,BLL的代码：

using BYCMS.Model;
using System.Linq;

namespace BYCMS.IDAL
{
public interface IUserInfoRepository
{
/// <summary>
/// 获取列表
/// </summary>
/// <param name="db">数据库上下文</param>
/// <returns>数据列表</returns>
IQueryable<UserInfo> GetList(DBContainer db);
/// <summary>
/// 创建一个实体
/// </summary>
/// <param name="entity">实体</param>
int Create(UserInfo entity);
/// <summary>
/// 删除一个实体
/// </summary>
/// <param name="entity">主键ID</param>
int Delete(int id);
/// <summary>
/// 修改一个实体
/// </summary>
/// <param name="entity">实体</param>
int Edit(UserInfo entity);
/// <summary>
/// 获得一个实体
/// </summary>
/// <param name="id">id</param>
/// <returns>实体</returns>
UserInfo GetById(int id);
/// <summary>
/// 判断一个实体是否存在
/// </summary>
bool IsExist(int id);
}
}

IDAL层-IUserInfoRepository

using BYCMS.IDAL;
using BYCMS.Model;
using System.Data.Entity;
using System.Linq;

namespace BYCMS.DAL
{
    public class UserInfoRepository : IUserInfoRepository
    {
        /// <summary>
        /// 创建一个实体
        /// </summary>
        /// <param name="entity">实体</param>
        /// <returns></returns>
        public int Create(UserInfo entity)
        {
            using (DBContainer db = new DBContainer())
            {
                db.Set<UserInfo>().Add(entity);
                return db.SaveChanges();
            }
        }
        /// <summary>
        /// 删除一个实体
        /// </summary>
        /// <param name="id">主键ID</param>
        /// <returns></returns>
        public int Delete(int id)
        {
            using (DBContainer db = new DBContainer())
            {
                UserInfo entity = db.UserInfoSet.Find(id);
                db.Set<UserInfo>().Remove(entity);
                return db.SaveChanges();
            }
        }
        /// <summary>
        /// 修改一个实体
        /// </summary>
        /// <param name="entity">实体</param>
        /// <returns></returns>
        public int Edit(UserInfo entity)
        {
            using (DBContainer db = new DBContainer())
            {
                db.Set<UserInfo>().Attach(entity);
                db.Entry(entity).State = EntityState.Modified;
                return db.SaveChanges();
            }
        }
        /// <summary>
        /// 获得一个实体
        /// </summary>
        /// <param name="id">主键ID</param>
        /// <returns></returns>
        public UserInfo GetById(int id)
        {
            using (DBContainer db = new DBContainer())
            {
                return db.UserInfoSet.Find(id);
            }
        }
        /// <summary>
        /// 获取列表
        /// </summary>
        /// <param name="db"></param>
        /// <returns></returns>
        public IQueryable<UserInfo> GetList(DBContainer db)
        {
            IQueryable<UserInfo> list = db.UserInfoSet.AsQueryable();
            return list;
        }
        /// <summary>
        /// 判断一个实体是否存在
        /// </summary>
        /// <param name="id">主键ID</param>
        /// <returns></returns>
        public bool IsExist(int id)
        {
            using (DBContainer db = new DBContainer())
            {
                UserInfo entity = GetById(id);
                if (entity != null)
                    return true;
                return false;
            }
        }
    }
}

DAL层-UserInfoRepository

using BYCMS.Model;
using System.Collections.Generic;

namespace BYCMS.IBLL
{
public interface IUserInfoBLL
{
/// <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<UserInfo> GetList();
/// <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(UserInfo 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(int id);
/// <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(UserInfo model);
/// <summary>
/// 根据ID获得一个Model实体
/// </summary>
/// <param name="id">id</param>
/// <returns>Model实体</returns>
UserInfo GetById(int 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(int id);
}
}

IBLL层-IUserInfoBLL

using BYCMS.Common;
using BYCMS.DAL;
using BYCMS.IBLL;
using BYCMS.IDAL;
using BYCMS.Model;
using System.Collections.Generic;
using System.Linq;

namespace BYCMS.BLL
{
public class UserInfoBLL : IUserInfoBLL
{
DBContainer db = new DBContainer();
IUserInfoRepository rep = new UserInfoRepository();

/// <summary>
/// 创建一个实体
/// </summary>
/// <param name="errors"></param>
/// <param name="model"></param>
/// <returns></returns>
public bool Create(UserInfo model)
{
if (rep.Create(model) == )
{
return true;
}
return false;
}
/// <summary>
/// 根据id删除实体
/// </summary>
/// <param name="errors"></param>
/// <param name="id"></param>
/// <returns></returns>
public bool Delete(int id)
{
if(rep.Delete(id) > )
{
return true;
}
return false;
}
/// <summary>
/// 编辑实体
/// </summary>
/// <param name="errors"></param>
/// <param name="model"></param>
/// <returns></returns>
public bool Edit(UserInfo model)
{
if (rep.Edit(model) > )
{
return true;
}
return false;
}
/// <summary>
/// 根据id查找实体
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public UserInfo GetById(int id)
{
return rep.GetById(id);
}
/// <summary>
/// 实体列表
/// </summary>
/// <param name="pager"></param>
/// <param name="queryStr"></param>
/// <returns></returns>
public List<UserInfo> GetList()
{
IQueryable<UserInfo> queryData = rep.GetList(db);
return queryData.ToList();
}
/// <summary>
/// 判断是否存在实体
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public bool IsExist(int id)
{
return rep.IsExist(id);
}
}
}

BLL层-UserInfoBLL

@{
Layout = null;
}

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>用户中心</title>
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="format-detection" content="telephone=no">
<link rel="stylesheet" href="~/Content/layui/css/layui.css" media="all" />
<link rel="stylesheet" href="~/Content/css/public.css" media="all" />
</head>
<body class="childrenBody">
<blockquote class="layui-elem-quote quoteBox">
<form class="layui-form">
<div class="layui-inline">
<div class="layui-input-inline">
<input type="text" class="layui-input searchVal" placeholder="请输入搜索的内容" />
</div>
<a class="layui-btn search_btn" data-type="reload">搜索</a>
</div>
<div class="layui-inline">
<a class="layui-btn layui-btn-normal addNews_btn">添加用户</a>
</div>
<div class="layui-inline">
<a class="layui-btn layui-btn-danger layui-btn-normal delAll_btn">批量删除</a>
</div>
</form>
</blockquote>
<table id="userList" lay-filter="userList"></table>
<!--操作-->
<script type="text/html" id="userListBar">
<a class="layui-btn layui-btn-xs" lay-event="edit">编辑</a>
<a class="layui-btn layui-btn-xs layui-btn-warm" lay-event="usable">已启用</a>
<a class="layui-btn layui-btn-xs layui-btn-danger" lay-event="del">删除</a>
</script>
<script type="text/javascript" src="~/Content/layui/layui.js"></script>
<script type="text/javascript" src="~/Content/js/user/userList.js"></script>
</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