BIM工程信息管理系统-EF实体框架数据操作基类

EF实体框架数据操作基类主要是规范增、改、查、分页、Lambda表达式条件处理，以及异步操作等特性，这样能够尽可能的符合基类这个特殊类的定义，实现功能接口的最大化重用和统一。

1、程序代码

 /// <summary>
    /// MSSQL数据库 数据层的父类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class BaseDAL<T> where T : class
    {
        //EF上下文
        private readonly DbContext _db;

      #region 00 单例模式

        private static BaseDAL<T> _mInstance = null;
        private static object obj = new object();

        public BaseDAL(DbContext db)
        {
            _db = db;
        }

        public static BaseDAL<T> ManagerContent(DbContext dbContext)
        {
            if (_mInstance == null)
            {
                lock (obj)
                {
                    _mInstance = new BaseDAL<T>(dbContext);
                }
            }
            return _mInstance;
        }

        #endregion

 #region 1.0 新增 实体 +int Add(T model)
        /// <summary>
        /// 新增 实体
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public bool Add(T model)
        {
            try
            {
                _db.Set<T>().Add(model);
                _db.SaveChanges();
                //保存成功后，会将自增的id设置给 model的 主键属性，并返回受影响行数
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            } 
            return true;
        }
        #endregion

 #region 2.0 根据 id 删除 +bool Del(T model)
        /// <summary>
        /// 根据 id 删除
        /// </summary>
        /// <param name="model">包含要删除id的对象</param>
        /// <returns></returns>
        public bool Del(T model)
        {
            try
            {
                _db.Set<T>().Attach(model);
                _db.Set<T>().Remove(model);
               _db.SaveChanges();
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            } 
            return true;
        }
        #endregion

      #region 3.0 根据条件删除 +bool DelBy(Expression<Func<T, bool>> delWhere)
        /// <summary>
        /// 3.0 根据条件删除
        /// </summary>
        /// <param name="delWhere"></param>
        /// <returns></returns>
        public bool DelBy(Expression<Func<T, bool>> delWhere)
        {
            try
            {
                //3.1查询要删除的数据
                List<T> listDeleting = _db.Set<T>().Where(delWhere).ToList();
                //3.2将要删除的数据 用删除方法添加到 EF 容器中
                listDeleting.ForEach(u =>
                {
                    _db.Set<T>().Attach(u);//先附加到 EF容器
                    _db.Set<T>().Remove(u);//标识为 删除 状态
                });
                //3.3一次性 生成sql语句到数据库执行删除
                 _db.SaveChanges();
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            } 
            return true;
        }
        #endregion

  #region 4.0 修改 +bool Modify(T model, params string[] proNames)
        /// <summary>
        /// 4.0 修改，如：
        /// T u = new T() { uId = 1, uLoginName = "asdfasdf" };
        /// this.Modify(u, "uLoginName");
        /// </summary>
        /// <param name="model">要修改的实体对象</param>
        /// <param name="proNames">要修改的 属性 名称</param>
        /// <returns></returns>
        public bool Modify(T model, params string[] proNames)
        {
            try
            {
                //4.1将 对象 添加到 EF中
                DbEntityEntry entry = _db.Entry<T>(model);
                //4.2先设置 对象的包装 状态为 Unchanged
                entry.State = EntityState.Unchanged;
                //4.3循环 被修改的属性名 数组
                foreach (string proName in proNames)
                {
                    //4.4将每个 被修改的属性的状态 设置为已修改状态;后面生成update语句时，就只为已修改的属性 更新
                    entry.Property(proName).IsModified = true;
                }
                //4.4一次性 生成sql语句到数据库执行
                _db.SaveChanges();
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            } 

            return true;
        }
        #endregion

  #region 4.1 批量修改 +bool Modify(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)
        /// <summary>
        /// 4.0 批量修改
        /// </summary>
        /// <param name="model">要修改的实体对象</param>
        /// <param name="whereLambda">查询条件</param>
        /// <param name="modifiedProNames">要修改的 属性 名称</param>
        /// <returns></returns>
        public bool ModifyBy(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)
        {
            try
            {
                //4.1查询要修改的数据
                List<T> listModifing = _db.Set<T>().Where(whereLambda).ToList();

                //获取 实体类 类型对象
                Type t = typeof(T); // model.GetType();
                //获取 实体类 所有的 公有属性
                List<PropertyInfo> proInfos = t.GetProperties(BindingFlags.Instance | BindingFlags.Public).ToList();
                //创建 实体属性 字典集合
                Dictionary<string, PropertyInfo> dictPros = new Dictionary<string, PropertyInfo>();
                //将 实体属性 中要修改的属性名 添加到 字典集合中 键：属性名  值：属性对象
                proInfos.ForEach(p =>
                {
                    if (modifiedProNames.Contains(p.Name))
                    {
                        dictPros.Add(p.Name, p);
                    }
                });

                //4.3循环 要修改的属性名
                foreach (string proName in modifiedProNames)
                {
                    //判断 要修改的属性名是否在 实体类的属性集合中存在
                    if (dictPros.ContainsKey(proName))
                    {
                        //如果存在，则取出要修改的 属性对象
                        PropertyInfo proInfo = dictPros[proName];
                        //取出 要修改的值
                        object newValue = proInfo.GetValue(model, null); //object newValue = model.uName;

                        //4.4批量设置 要修改 对象的 属性
                        foreach (T usrO in listModifing)
                        {
                            //为 要修改的对象 的 要修改的属性 设置新的值
                            proInfo.SetValue(usrO, newValue, null); //usrO.uName = newValue;
                        }
                    }
                }
                //4.4一次性 生成sql语句到数据库执行
                 _db.SaveChanges();
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            } 

            return true;
        }
        #endregion

   #region 4.2 修改个单个实体
        public bool Modify(T model)
        {
            try
            {
                _db.Entry(typeof (T)).State = EntityState.Modified;
                //4.4一次性 生成sql语句到数据库执行
                _db.SaveChanges();
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            }

            return true;
        }
        #endregion

#region 5.0 根据条件查询 +IQueryable<T> GetListBy(Expression<Func<T,bool>> whereLambda)
        /// <summary>
        /// 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)
        /// </summary>
        /// <param name="whereLambda">Lambda表达式</param>
        /// <returns></returns>
        public IQueryable<T> GetListBy(Expression<Func<T, bool>> whereLambda)
        {
            try
            {
                return _db.Set<T>().Where(whereLambda);
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            } 
        }
        #endregion

#region 5.1 根据条件 排序 和查询 + IQueryable<T> GetListBy<TKey>
        /// <summary>
        /// 5.1 根据条件 排序 和查询
        /// </summary>
        /// <typeparam name="TKey">排序字段类型</typeparam>
        /// <param name="whereLambda">查询条件 lambda表达式</param>
        /// <param name="orderLambda">排序条件 lambda表达式</param>
        /// <returns></returns>
        public IQueryable<T> GetListBy<TKey>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderLambda)
        {
            try
            {
                return _db.Set<T>().Where(whereLambda).OrderBy(orderLambda);
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            } 
        }
        #endregion

#region 5.2 根据条件查询 返回单条数据 T GetEntity(Expression<Func<T, bool>> whereLambda)

        public T GetEntity(Expression<Func<T, bool>> whereLambda)
        {
            try
            {
                return _db.Set<T>().First(whereLambda);
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
             throw   exc.InnerException;
            }  
        }
        #endregion

    #region 6.0 分页查询 + IQueryable<T> GetPagedList<TKey>
        /// <summary>
        /// 6.0 分页查询 + IQueryable<T> GetPagedList<TKey>
        /// </summary>
        /// <param name="pageIndex">页码</param>
        /// <param name="pageSize">页容量</param>
        /// <param name="whereLambda">条件 lambda表达式</param>
        /// <param name="orderBy">排序 lambda表达式</param>
        /// <returns></returns>
        public IQueryable<T> GetPagedList<TKey>(int pageIndex, int pageSize, Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderBy)
        {
            // 分页 一定注意： Skip 之前一定要 OrderBy
            try
            {
                return _db.Set<T>().Where(whereLambda).OrderBy(orderBy).Skip((pageIndex - 1) * pageSize).Take(pageSize);
            }
            catch (EntityException ex)
            {
                LogHelper.Error("Add", ex);
                LogHelper.Error(ex.Message); throw ex.InnerException;
            }
            catch (DbException exc)
            {
                LogHelper.Error("Add", exc);
                throw exc.InnerException;
            } 
        }
        #endregion

#region 7.0执行SQL+string ExecMaxValueSql()
        public string ExecMaxValueSql()
        {
            string sql = @"begin tran
                DECLARE @Value bigint
                update " + typeof(T).Name + @"
                set value = value+1;
                select @Value = value from " + typeof(T).Name + @";
                 select cast(@Value as varchar(10));
                commit tran";
            string value = _db.Database.SqlQuery<string>(sql).First();

            return value;
        }
        #endregion

   }

2、 日志记录组件采用 Log4Net

   public class LogHelper
    {
        private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("ApplicationLog");
        public static void Info(string info)
        {
            Log.Info(info);
        }
        public static void Info(string info, Exception ex)
        {
            Log.Info(info, ex);
        }
        public static void Error(string info, Exception ex)
        {
            Log.Info(info, ex);
        }
        public static void Error(string info)
        {
            Log.Error(info);
        }
        public void Debug(string info)
        {
            Log.Debug(info);
        }
        public void Debug(string info, Exception se)
        {
            Log.Debug(info, se);
        }
        public void Warn(string info)
        {
            Log.Warn(info);
        }
        public void Warn(string info, Exception ex)
        {
            Log.Warn(info, ex);
        }
        public void Fatal(string info)
        {
            Log.Fatal(info);
        }
        public void Fatal(string info, Exception ex)
        {
            Log.Fatal(info, ex);
        }
    }

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
  <logger name="ApplicationLog">
    <level value="INFO" />
    <appender-ref ref="rollingFile" />
  </logger>

  <appender name="rollingFile" type="log4net.Appender.RollingFileAppender, log4net" >
    <param name="File" value="ServiceLog.txt" />
    <param name="AppendToFile" value="true" />
    <param name="RollingStyle" value="Date" />
    <param name="MaximumFileSize" value="5MB"></param>
    <param name="DatePattern" value="_yyyy.MM.dd" />
    <param name="StaticLogFileName" value="true" />
    <layout type="log4net.Layout.PatternLayout, log4net">
      <param name="ConversionPattern" value="%d - %m%n" />
    </layout>
  </appender>
</log4net>