• MVC+easyui 完整实现


    学习mvc半月有余,趁几天假期,没事做就动手做一个完整的网站玩玩,顺便和上家公司的方法做个比较。页面引擎采用mvc自带的功能,建立视图,交给.net自带渲染出页面(对比:上家公司采用的第三方组件渲染的);前台和后台通过ajax方式交互(对比:基于ashx+配置文件,采用反射来实现,比较繁琐);orm采用自带的EF6(对比:采用Dbcommand封装,datatable和model之间采用反射实现自动绑定,不支持add一个对象,比较低端),吸取上家大牛的方法,可自定义数据库配置,比如定义sql以及使用什么数据库,只是使用起来比较蹩脚,大牛勿喷;页面模板之前使用template.js,现在尝试了razor语法。功能:权限部分基本实现完整,后续有时间继续完善了。通过此次实践:积累一些心得是,很多看似简单的东西,如果动手起来,还是有不少细节去注意,这期间可能就是一种体验,一种经验的积累,各种滋味只有自己尝试了才会有所获。

    环境:vs2015+ sql server 2008+ EF6+ easyui.备注是支持MySQL的,采用EF,稍微封装了一下。

    权限控制,MVC下真的很方便,可控制页面菜单,可控制操作级别的,点赞。下面是抄袭网上的。

     public class AuthorizeManageAttribute : AuthorizeAttribute
        {
            private int _a, _b;
            private bool yes;
            public AuthorizeManageAttribute(int a, int b)
            {
                _a = a;
                _b = b;
            }
            //首先被执行的方法
            protected override bool AuthorizeCore(HttpContextBase httpContext)
            {
                yes = _a > _b;
                return yes;
            }
            //尽在authorizecore方法返回false时执行
            protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
            {
                base.HandleUnauthorizedRequest(filterContext);
                if (filterContext == null)
                {
                    throw new ArgumentNullException("filterContext");
                }
                else
                {
                    filterContext.HttpContext.Response.Redirect("/HtmlPage1.html");
                }
            }
        }
    

     EF,一个蹩脚的封装:

    namespace FrameWrok.Common
    {
        internal class DataCommandContext<TContext> where TContext :DbContext,new()
        {
            public void Dispose()
            {
              
            }
    
            public static TContext GetContext()
            {
                return new TContext();
            }
        }
    }
    
    
     public class DataCommand<TContext> where TContext : DbContext, new()
        {
            private readonly string _cmdKey;
            private readonly string _server;
            private IDictionary<string, SqlCmdModel> _dictCmd = new Dictionary<string, SqlCmdModel>();
    
            /// <summary>
            /// xml中,sqlcmd 的name属性
            /// </summary>
            public string CmdKey
            {
                get
                {
                    return _cmdKey;
                }
            }
            /// <summary>
            /// 数据库类型:支持sql server
            /// </summary>
            public string Server
            {
                get
                {
                    return _server;
                }
            }
    
            /// <summary>
            /// 当前sql语句
            /// </summary>
            public string CurCmdLine => _dictCmd.Keys.Any() == false ? string.Empty : _dictCmd[_cmdKey].CmdLine;
    
            public DataCommand() { }
            public DataCommand(string server, string sqlCmdName)
            {
                _server = server;
                _cmdKey = sqlCmdName;
                ReadCmmdConfig();
            }
            /// <summary>
            /// sql语句参数,采用简单的字符串替换,因此在sql字符串中不能用重复的关键字出现(对比:采用setparameter更加严谨)
            /// </summary>
            /// <param name="param"></param>
            /// <param name="val"></param>
            public void SetParameters(string param, string val)
            {
                if(_dictCmd.Keys.Any()==false) throw new SqlNotFilledException();
                var targetCmd = _dictCmd[_cmdKey].CmdLine;
                _dictCmd[_cmdKey].CmdLine = targetCmd.Replace(param, val);
            }
            /// <summary>
            /// 自定义sql
            /// </summary>
            /// <typeparam name="T">根据输出的sql字段定义类</typeparam>
            /// <returns>可以返回null</returns>
            public List<T> ExecuteSql<T>()
            {
                if (string.IsNullOrEmpty(CurCmdLine)) return null;
                using (var db =  DataCommandContext<TContext>.GetContext())
                {
                    var sql = CurCmdLine;
                    var res = db.Database.SqlQuery<T>(sql).ToList();
                    return res;
                }
            }
            public void ExecuteNoReturn()
            {
                if (string.IsNullOrEmpty(CurCmdLine)) return ;
                using (var db = DataCommandContext<TContext>.GetContext())
                {
                    var sql = CurCmdLine;
                    db.Database.ExecuteSqlCommand(sql);
                }
            }
            /// <summary>
            /// 添加基本表内容
            /// </summary>
            /// <typeparam name="T"></typeparam>
            /// <param name="obj"></param>
            /// <returns></returns>
            public static bool Add<T>(T obj) where T:class 
            {
                using (var db = DataCommandContext<TContext>.GetContext())
                {
                    db.Entry(obj).State=EntityState.Added;
                    db.SaveChanges();
                    return true;
                }
            }
            public static DbContext GetCurContext()
            {
                return DataCommandContext<TContext>.GetContext();
            }
            private void ReadCmmdConfig()
            {
                var dir=new DirectoryInfo(AppDomain.CurrentDomain.BaseDirectory+"config");
                if(dir==null) throw new InvalidOperationException();
                var fileList=dir.GetFiles("*.xml");
                foreach (var fileInfo in fileList)
                {
                    ParseXml(fileInfo.FullName);
                    if (_dictCmd.Keys.Count > 0) return;
                }
            }
    
            private void ParseXml(string path)
            {
                SqlRoot root;
                using (var stream = new StreamReader(path))
                {
                    var xmlSeri = new XmlSerializer(typeof(SqlRoot));
                    root = (SqlRoot)xmlSeri.Deserialize(stream);
                }
                if (!root.SqlCmdList.Any()) throw new SqlNullValueException();
                var serverFound =root.SqlCmdList.Where(x => x.Name.Equals(_server)).ToList();
                if(!serverFound.Any()) throw new SqlNullValueException();
                var cmdFound = serverFound[0].SqlCmd.Where(x => x.Name.Equals(_cmdKey)).ToList();
                if(!cmdFound.Any()) throw new SqlNotFilledException();
                _dictCmd.Add(_cmdKey,cmdFound[0]);
            }
        }
        
        [XmlRoot("SqlRoot")]
        public class SqlRoot
        {
            [XmlElement("SqlList")]
            public List<SqlList> SqlCmdList;
        }
        [XmlRoot("SqlList")]
        public class SqlList
        {
            [XmlAttribute("name")]
            public string Name { get; set; }
    
            [XmlElement("SqlCmd")]
            public List<SqlCmdModel> SqlCmd { get; set; } 
        }
        [XmlRoot("SqlCmd")]
        public class SqlCmdModel
        {
            [XmlElement("param")]
            public List<Params> Param { get; set; }
            [XmlElement("CmdLine")]
            public string CmdLine { get; set; }
            [XmlAttribute("name")]
            public string Name { get; set; }
        }
        [XmlRoot]
        public class Params
        {
            [XmlAttribute("name")]
            public string Name { get; set;}
            [XmlAttribute("type")]
            public string Type { get; set; }
        }
    

     当你想自定义sql,不想使用linq to sql时,可以在配置文件中定义结构,将获取的sql传递EF执行,xml结构:

    <?xml version="1.0" encoding="utf-8" ?>
    <SqlRoot>
      <SqlList name="sqlServer">
        <SqlCmd name="DeleteRolesById">
          <CmdLine>
            <![CDATA[
            delete from tb_usergroup where id in(@roles)
        ]]>
          </CmdLine>
          <param name="@roles" type="string"/>
        </SqlCmd>
        <SqlCmd name="DeleteUserById">
          <CmdLine>
            <![CDATA[
            delete from tb_user where id in(@roles)
        ]]>
          </CmdLine>
          <param name="@roles" type="string"/>
        </SqlCmd>
        <SqlCmd name="GetBlogAll">
          <CmdLine>
            <![CDATA[
            select * from blogs --where blogid=@BlogId
        ]]>
          </CmdLine>
        </SqlCmd>
    
        <SqlCmd name="GetBlogTitle">
          <CmdLine>
            <![CDATA[
            select p.PostId, p.Title,b.Name from Posts p
    left join Blogs b on p.BlogId=b.BlogId
    
        ]]>
          </CmdLine>
        </SqlCmd>
      </SqlList>
      <SqlList name="mySql">
       
      </SqlList>
      <SqlList name="oracle">
      </SqlList>
    </SqlRoot>
    View Code

    之前没做过mvc,使用公司封装的框架,但是通过一路做下来,查资料,很多原理或者基本是相通的,从页面渲染处理,前端和后端交互,后台权限控制方法、orm数据层,采用mvc似乎更加方便,mvc只是多了个路由功能,可怜那帮小伙伴还在被蹂躏中。

  • 相关阅读:
    _allow_resetlogs_corruption打开数据库
    增量备份恢复DATAGUARD(出现gap并后续有新增数据文件,主从数据文件路径一致)
    dataguard环境破坏后采用rman备份集重新部署
    表空间数据文件迁移到另外的位置(backup as copy tablespace)
    pl/sql无法登录12c问题
    ORA-00845: MEMORY_TARGET not supported on this system
    dataguard主库添加的数据文件路径在从库不存在
    12c expdp
    表进行加密(redact)实验
    创建触发器启动pdb
  • 原文地址:https://www.cnblogs.com/DebugMe/p/5188877.html
Copyright © 2020-2023  润新知