上一篇《系统操作日志设计》，已基本介绍了为什么要系统操作日志和设计系统操作日志部分内容，如不清楚系统操作日志的请点这里。 :)
通了解《系统操作日志设计》，已基本明确我们不能通过clone的方式来做日志的设计，因为这样不仅会造成的你数据库表爆炸的情况，还大大的增加了工作量，减少了系统的可维护性。
通过思考大概清楚系统操作日志的设计，以下是其UML图：
通过上图，我们可以了解知道该UML主要由三个表组成，其中一个主表LogSetting和两个从表分别是LogOperation和LogSettingDetail。
那么怎么样才能通过这样的设计来现实我们的日志功能呢？
其实一开始我就觉得通过.net的反射功能可以很简单、很方便的实现这个功能，所以我就顺着一个思路来实现她；通过反射动态的获取Model实体的属性，然后再根据LogSettingDetail配置来匹配所要记录的字段信息。
先来主要的代码吧，发现将思想用文字表达出来还是较困难的，代码比较直接：
代码的实现
usingSystem;usingSystem.Data;usingSystem.Configuration;usingSystem.Web;usingSystem.Web.Security;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingSystem.Web.UI.WebControls.WebParts;usingSystem.Web.UI.HtmlControls;usingBLL.Sys;usingSystem.Collections.Generic;usingSystem.Collections.Specialized;usingSystem.Text;usingSystem.Reflection;/// <summary> ///LogManager 的摘要说明/// </summary>public classLogManager<T>whereT :new() {#regionConstructor/// <summary> ///日志管理构造函数/// </summary>publicLogManager() { tableName =typeof(T).Name; Model.Sys.LogSettingmodel = GetLogSetting(tableName);if(model !=null) { businessName = model.BusinessName; logID = model.LogID; primaryKey = model.PrimaryKey; urlTemplate = model.UrlTemplate; deleteScriptTemplate = model.DeleteScriptTemplate; updateScriptTemplate = model.UpdateScriptTemplate; }else{throw newArgumentNullException("日志设置为空！"); } }/// <summary>//////日志管理构造函数/// </summary> /// </summary> /// <param name="tableName">表名</param> /// <param name="businessName">业务名称</param>publicLogManager(stringtableName,stringbusinessName) {this.tableName = tableName;this.businessName = businessName; Model.Sys.LogSettingmodel = GetLogSetting(tableName, businessName);if(model !=null) { logID = model.LogID; primaryKey = model.PrimaryKey; urlTemplate = model.UrlTemplate; deleteScriptTemplate = model.DeleteScriptTemplate; updateScriptTemplate = model.UpdateScriptTemplate; }else{throw newArgumentNullException("日志设置为空！"); } }#endregion #regionPropertiesprivate intlogID;private stringtableName;private stringbusinessName;private stringprimaryKey;private stringurlTemplate;private stringdeleteScriptTemplate;private stringupdateScriptTemplate;/// <summary> ///日志设置实体列表/// </summary>publicList<Model.Sys.LogSetting> LogSettingList {get{ System.Web.Caching.Cachecache =HttpRuntime.Cache;List<Model.Sys.LogSetting> list = cache["LogSettingList"]asList<Model.Sys.LogSetting>;if(list !=null&& list.Count > 0) {returnlist; }else{LogSettingbll =newLogSetting(); list = bll.GetModelList(string.Empty); cache["LogSettingList"] = list;returnlist; } }set{ System.Web.Caching.Cachecache =HttpRuntime.Cache; cache["LogSettingList"] =null; } }/// <summary> ///日志设置明细/// </summary>publicList<Model.Sys.LogSettingDetail> LogSettingDetail {get{ System.Web.Caching.Cachecache =HttpRuntime.Cache;List<Model.Sys.LogSettingDetail> list = cache["LogSettingDetail"]asList<Model.Sys.LogSettingDetail>;if(list !=null&& list.Count > 0) {returnlist; }else{LogSettingDetailbll =newLogSettingDetail(); list = bll.GetModelList(string.Empty); cache["LogSettingDetail"] = list;returnlist; } }set{ System.Web.Caching.Cachecache =HttpRuntime.Cache; cache["LogSettingDetail"] =null; } }#endregion #regionMethod/// <summary> ///通过logId获取日志设置明细/// </summary> /// <param name="logId">日志设置编号</param> /// <returns></returns>privateList<Model.Sys.LogSettingDetail> GetLogSettingDetails(intlogId) {if(logId == 0)throw newArgumentNullException("LogID为空");List<Model.Sys.LogSettingDetail> list =newList<Model.Sys.LogSettingDetail>();foreach(Model.Sys.LogSettingDetailvarinLogSettingDetail) {if(var.LogID == logId) list.Add(var); }returnlist; }/// <summary> ///通过tableName和businessName来获取日志设置对象/// </summary> /// <param name="tableName"></param> /// <param name="businessName"></param> /// <returns></returns>privateModel.Sys.LogSettingGetLogSetting(stringtableName,stringbusinessName) {foreach(Model.Sys.LogSettingvarinLogSettingList) {if(var.TableName.Equals(tableName,StringComparison.InvariantCultureIgnoreCase) && var.BusinessName.Equals(businessName,StringComparison.InvariantCultureIgnoreCase))returnvar; }return null; }privateModel.Sys.LogSettingGetLogSetting(stringtableName) {foreach(Model.Sys.LogSettingvarinLogSettingList) {if(var.TableName.Equals(tableName,StringComparison.InvariantCultureIgnoreCase))returnvar; }return null; }/// <summary> ///比较两个实体，然后返回实体中每个属性值不同的内容/// </summary> /// <param name="oldObj"></param> /// <param name="newObj"></param> /// <returns></returns>public stringCompare(T oldObj, T newObj) {TypeobjTye =typeof(T);StringBuildersbResult =newStringBuilder();stringtableHeader ="<table class=/"GridView/" cellspacing=/"0/" rules=/"all/" border=/"1/" id=/"gv/" style=/"border-collapse:collapse;/">"; tableHeader +="<tr><th scope=/"col/">序号</th><th scope=/"col/">字段</th><th scope=/"col/">名称</th><th scope=/"col/">旧值</th><th scope=/"col/">新值</th></tr>";stringtableRow ="<tr class='{0}'><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td><td>{5}</td></tr>";List<Model.Sys.LogSettingDetail> list = GetLogSettingDetails(logID);inti = 1;foreach(Model.Sys.LogSettingDetailvarinlist) {PropertyInfoproperty = objTye.GetProperty(var.ColumnName);if(property !=null&& !property.IsSpecialName) {objecto = property.GetValue(oldObj,null);objectn = property.GetValue(newObj,null);if(!IsEqual(property.PropertyType, o, n)) { sbResult.AppendFormat(tableRow, i % 2 == 0 ?"odd":"even", i, var.ColumnName, var.ColumnText, o, n); i++; } } } sbResult.Append("</table>");#regionAdd Log Recordif(i > 1) { Model.Sys.LogOperationoperModel =newModel.Sys.LogOperation(); operModel.LogID = logID; operModel.OperationType = (int)OperationType.Update; operModel.Content = tableHeader + sbResult.ToString(); operModel.CreateTime =DateTime.Now;if(HttpContext.Current !=null) operModel.CreateUser =HttpContext.Current.User.Identity.Name;if(!string.IsNullOrEmpty(primaryKey)) {PropertyInfop = objTye.GetProperty(primaryKey);objecto = p.GetValue(newObj,null);if(o !=null) { operModel.PrimaryKeyValue = o.ToString();if(urlTemplate.Contains("{0}")) operModel.Url =string.Format(urlTemplate, o.ToString()); } }LogOperationoperBll =newLogOperation(); operBll.Add(operModel); }#endregion returntableHeader + sbResult.ToString(); }/// <summary> ///删除实体操作，这里并不是真的删除该实体，而是将删除的操作记录在日志中/// </summary> /// <param name="obj"></param> /// <returns></returns>public stringDelete(T obj) {TypeobjTye =typeof(T);StringBuildersbResult =newStringBuilder();stringtableHeader ="<table class=/"GridView/" cellspacing=/"0/" rules=/"all/" border=/"1/" id=/"gv/" style=/"border-collapse:collapse;/">"; tableHeader +="<tr><th scope=/"col/">序号</th><th scope=/"col/">字段</th><th scope=/"col/">名称</th><th scope=/"col/">值</th></tr>";stringtableRow ="<tr class='{0}'><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td></tr>";List<Model.Sys.LogSettingDetail> list = GetLogSettingDetails(logID);inti = 1;foreach(Model.Sys.LogSettingDetailvarinlist) {PropertyInfoproperty = objTye.GetProperty(var.ColumnName);if(property !=null&& !property.IsSpecialName) {objecto = property.GetValue(obj,null); sbResult.AppendFormat(tableRow, i % 2 == 0 ?"odd":"even", i, var.ColumnName, var.ColumnText, o); i++; } } sbResult.Append("</table>");#regionAdd Log Record Model.Sys.LogOperationoperModel =newModel.Sys.LogOperation(); operModel.LogID = logID; operModel.OperationType = (int)OperationType.Delete; operModel.Content = tableHeader + sbResult.ToString(); operModel.CreateTime =DateTime.Now;if(!string.IsNullOrEmpty(primaryKey)) {PropertyInfop = objTye.GetProperty(primaryKey);objecto = p.GetValue(obj,null);if(o !=null) { operModel.PrimaryKeyValue = o.ToString();if(urlTemplate.Contains("{0}")) operModel.Url =string.Format(urlTemplate, o.ToString()); } }if(HttpContext.Current !=null) operModel.CreateUser =HttpContext.Current.User.Identity.Name;LogOperationoperBll =newLogOperation(); operBll.Add(operModel);#endregion return string.Empty; }/// <summary> ///添加实体，将添加的操作记录在日志中/// </summary> /// <param name="obj"></param> /// <returns></returns>public stringAdd(T obj) {TypeobjTye =typeof(T);StringBuildersbResult =newStringBuilder();stringtableHeader ="<table class=/"GridView/" cellspacing=/"0/" rules=/"all/" border=/"1/" id=/"gv/" style=/"border-collapse:collapse;/">"; tableHeader +="<tr><th scope=/"col/">序号</th><th scope=/"col/">字段</th><th scope=/"col/">名称</th><th scope=/"col/">值</th></tr>";stringtableRow ="<tr class='{0}'><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td></tr>";List<Model.Sys.LogSettingDetail> list = GetLogSettingDetails(logID);inti = 1;foreach(Model.Sys.LogSettingDetailvarinlist) {PropertyInfoproperty = objTye.GetProperty(var.ColumnName);if(property !=null&& !property.IsSpecialName) {objecto = property.GetValue(obj,null); sbResult.AppendFormat(tableRow, i % 2 == 0 ?"odd":"even", i, var.ColumnName, var.ColumnText, o); i++; } } sbResult.Append("</table>");#regionAdd Log Record Model.Sys.LogOperationoperModel =newModel.Sys.LogOperation(); operModel.LogID = logID; operModel.OperationType = (int)OperationType.Add; operModel.Content = tableHeader + sbResult.ToString(); operModel.CreateTime =DateTime.Now;if(!string.IsNullOrEmpty(primaryKey)) {PropertyInfop = objTye.GetProperty(primaryKey);objecto = p.GetValue(obj,null);if(o !=null) { operModel.PrimaryKeyValue = o.ToString();if(urlTemplate.Contains("{0}")) operModel.Url =string.Format(urlTemplate, o.ToString()); } }if(HttpContext.Current !=null) operModel.CreateUser =HttpContext.Current.User.Identity.Name;LogOperationoperBll =newLogOperation(); operBll.Add(operModel);#endregion return string.Empty; }/// <summary> ///复制一个对象/// </summary> /// <param name="obj"></param> /// <returns></returns>publicT Clone(T obj) {TypeobjTye =typeof(T); T model =newT();PropertyInfo[] properties = objTye.GetProperties();foreach(PropertyInfopropertyinproperties) {if(!property.IsSpecialName) {objecto = property.GetValue(obj,null); property.SetValue(model, o,null); } }returnmodel; }private boolIsEqual(TypedataType,objectoldObj,objectnewObj) {if(oldObj ==null&& newObj ==null)return true;if(dataType ==typeof(int)) {return(int)oldObj == (int)newObj; }else if(dataType ==typeof(decimal)) {return(decimal)oldObj == (decimal)newObj; }else if(dataType ==typeof(double)) {return(double)oldObj == (double)newObj; }else if(dataType ==typeof(Guid)) {return(Guid)oldObj == (Guid)newObj; }else if(dataType ==typeof(DateTime)) {return(DateTime)oldObj == (DateTime)newObj; }else returnoldObj.Equals(newObj); }#regionScript. Excute//public int DeleteBusRecode(string primaryKeyValue) //{ // if (string.IsNullOrEmpty(tableName)) // throw new ArgumentException("tableName为空"); // if(string.IsNullOrEmpty(primaryKey)) // throw new ArgumentException("primaryKey为空"); // if (string.IsNullOrEmpty(deleteScriptTemplate)) // throw new ArgumentException("deleteScriptTemplate为空"); // string strSql = string.Format(deleteScriptTemplate, primaryKeyValue); // Database db = DatabaseFactory.CreateDatabase(); // return 0; //}#endregion #endregion}public enumOperationType{ Select = 0, Add = 1, Update = 2, Delete = 3 }
使用的场景
Model文件：
publicclassEmployeeModel {publicintID{get;set;}publicstringName{get;set;} … }
下面介绍如何将系统操作日志集成到你的业务系统中
添加操作：
EmployeeBll bll = new EmployeeBll();
EmployeeModel model = new EmployeeModel();
/* model 实体经过漫长的 赋值 后… */
bll.Add(model); //添加实体
//添加系统操作记录
//日志LogManager<EmployeeModel> log =newLogManager<EmployeeModel>();
log.Add(model);
更新操作：
EmployeeBll bll = new EmployeeBll();
EmployeeModel model = bll.GetModel(employeeID);
LogManager<EmployeeModel> log =newLogManager<EmployeeModel>();
EmployeeModel modelOld = log.Clone(model); //克隆EmployeeModel实体对象，这个主要是在系统操作日志记录时使用的
/* model 实体又经过漫长的 赋值 后… */
bll.Update(model); //更新实体
//将更新的内容写入系统操作日志中
log.Compare(modelOld, model); //原来的实体和赋值后的实体对比，并将更新的内容写入系统操作日志中
删除操作：
在GridView的RowDeleting事件中获取要删除的实体
EmployeeBll bll = new EmployeeBll();
EmployeeModel model = bll.GetModel(employeeID);
bll.Delete(employeeID);
LogManager<EmployeeModel> log =newLogManager<EmployeeModel>(); log.Delete(model); //实体的内容记录到日志中
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总结：
大家可以看到代码还是比较粗糙的，有不少的重复的代码，下一节将会讨论如何进行系统操作日志管理。
另外如何大家有什么意见或想法请分享提出。
本节用到的知识点：
1、泛型
2、反射
3、缓存
优点：
1、使用和集成方便，代码量小；
2、大大提高工作效率，避免表爆炸；
缺点：
1、代码有待优化；
2、可扩展性较差