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我们都知道，报表有个功能为导出excel，但是有的时候客户需求往往标准的报表达不到，比如导出excel，其中本月修改的数据字段标红，如下图所示。
这就需要我们去写VF来实现此功能。
需求：将数据表记录导出成excel，其中excel内容需要本月修改的数据字段自动标红显示。
表：Goods__c，字段如下：
设计思路：如果导出excel并且需要跟踪每个字段的修改时间进行校验是否标红，则需要有一个表取跟踪这个表.有两种方式进行Track。
1.salesforce中提供了Track History功能，即当表字段小于20个情况下，可以通过设置Track History，那样系统会自动创建相关表的History表，在这个demo中系统会自动创建Goods_History表。详细Track History知识可以参看以下链接：
2.当表的字段超过20个，则通过Track History便无法满足需求了，这种情况我们需要自己创建一个sObject来和需要track的sObject进行关联，如下图所示：
页面显示均使用标准生成的页面，在Goods__c修改情况下，需要设置Trigger自动插入此条Goods__c记录对应的GoodsSign__c记录，如果某个字段有修改，则设置某个字段相对应的Date信息为System.today().
制作步骤：
1.写GoodsTrigger.Trigger代码如下所示：
1 trigger GoodsTrigger on Goods__c (before delete, before update) { 2 if(trigger.isBefore) { 3 //get the Schema Information of GoodsSign to check whether current user has access to operate the data 4 Schema.DescribeSObjectResult goodsSignDescribe = GoodsSign__c.sObjectType.getDescribe(); 5 List<GoodsSign__c> goodsSignList = new List<GoodsSign__c>(); 6 if(trigger.isUpdate) { 7 if(goodsSignDescribe.isCreateable() && goodsSignDescribe.isUpdateable()) { 8 List<Goods__c> goodsNewList = trigger.new; 9 List<Goods__c> goodsOldList = trigger.old; 10 for(Integer i=0;i<goodsNewList.size();i++) { 11 Goods__c goodsNew = goodsNewList.get(i); 12 Goods__c goodsOld = goodsOldList.get(i); 13 GoodsSign__c goodsSign; 14 Id goodsId = goodsNew.Id; 15 String fetchGoodsSignByGoodsId = ‘SELECT CreatedById, CreatedDate,‘ + 16 ‘ IsDeleted, GoodsBrandDate__c, GoodsCostPriceDate__c,‘ + 17 ‘ GoodsDescribeDate__c, GoodsId__c, GoodsNameDate__c,‘ + 18 ‘ GoodsPriceDate__c, Name, LastModifiedById, LastModifiedDate,‘ + 19 ‘ OwnerId, Id, SystemModstamp FROM GoodsSign__c ‘ + 20 ‘ where GoodsId__c = :goodsId‘; 21 List<GoodsSign__c> tempGoodsSignList = Database.query(fetchGoodsSignByGoodsId); 22 if(tempGoodsSignList != null && tempGoodsSignList.size() > 0) { 23 goodsSign = tempGoodsSignList.get(0); 24 } else { 25 goodsSign = new GoodsSign__c(); 26 } 27 if(goodsNew.GoodsName__c != goodsOld.GoodsName__c) { 28 goodsSign.GoodsNameDate__c = System.today(); 29 } 30 if(goodsNew.GoodsPrice__c != goodsOld.GoodsPrice__c) { 31 goodsSign.GoodsPriceDate__c = System.today(); 32 } 33 if(goodsNew.GoodsCostPrice__c != goodsOld.GoodsCostPrice__c) { 34 goodsSign.GoodsCostPriceDate__c = System.today(); 35 } 36 if(goodsNew.GoodsBrand__c != goodsOld.GoodsBrand__c) { 37 goodsSign.GoodsBrandDate__c = System.today(); 38 } 39 if(goodsNew.GoodsDescribe__c != goodsOld.GoodsDescribe__c) { 40 goodsSign.GoodsDescribeDate__c = System.today(); 41 } 42 if(goodsSign.GoodsId__c == null) { 43 goodsSign.GoodsId__c = goodsId; 44 } 45 goodsSignList.add(goodsSign); 46 } 47 if(goodsSignList.size() > 0) { 48 try { 49 upsert goodsSignList; 50 } catch(DMLException e) { 51 //TODO 52 } 53 } 54 } 55 56 } else if(trigger.isDelete) { 57 //cascade delete 58 if(goodsSignDescribe.isDeletable()) { 59 List<Goods__c> goodsList = trigger.old; 60 Set<ID> goodsIdSet = new Set<ID>(); 61 for(Goods__c currentGoods : goodsList) { 62 if(!goodsIdSet.contains(currentGoods.Id)) { 63 goodsIdSet.add(currentGoods.Id); 64 } 65 } 66 String fetchGoodsSignByGoodsIdSet = ‘SELECT CreatedById, CreatedDate,‘ + 67 ‘ IsDeleted, GoodsBrandDate__c, GoodsCostPriceDate__c, GoodsDescribeDate__c,‘ + 68 ‘ GoodsId__c, GoodsNameDate__c, GoodsPriceDate__c, Name, LastModifiedById,‘ + 69 ‘ LastModifiedDate, OwnerId, Id, SystemModstamp FROM GoodsSign__c‘ + 70 ‘ where GoodsId__c in :goodsIdSet‘; 71 List<GoodsSign__c> goodsSignNeedDeleteList = Database.query(fetchGoodsSignByGoodsIdSet); 72 try { 73 delete goodsSignNeedDeleteList; 74 } catch(DMLException e) { 75 //TODO 76 } 77 } 78 79 } 80 } 81 //TriggerFactory.instanceHandler(Goods__c.sObjectType); 82 }
此Trigger有两个功能：
1.当进行修改操作并且Goods__c记录有字段改变时，如果有相对应的GoodsSign__c进行对应，则update此记录，否则新建记录，并记录哪些字段有修改;
2.当进行删除操作时，如果有相对应的GoodsSign__c进行对应，则级联删除。
两者操作均需要当前用户有GoodsSign的操作权限。
2.新建一个类用来记录导出的字段以及导出的字段的颜色。
1 public with sharing class GoodsExportObject { 2 public String goodsName{get;set;} 3 public String goodsNameColor{get;set;} 4 public String goodsBrand{get;set;} 5 public String goodsBrandColor{get;set;} 6 public String goodsPrice{get;set;} 7 public String goodsPriceColor{get;set;} 8 public String goodsCostPrice{get;set;} 9 public String goodsCostPriceColor{get;set;} 10 public String goodsDescribe{get;set;} 11 public String goodsDescribeColor{get;set;} 12 }
3.新建Controller，此Controller用来获取显示到excel的数据。
1 public with sharing class ExportGoodsController { 2 3 List<Goods__c> goodsList{get;set;} 4 List<GoodsSign__c> goodsSignList{get;set;} 5 public List<GoodsExportObject> exportGoodsList{get;set;} 6 Map<Id,GoodsSign__c> goodsSignMap = new Map<Id,GoodsSign__c>(); 7 public ExportGoodsController() { 8 goodsList = new List<Goods__c>(); 9 goodsSignList = new List<GoodsSign__c>(); 10 exportGoodsList = new List<GoodsExportObject>(); 11 String fetchAllGoods = ‘SELECT CreatedById, CreatedDate, IsDeleted,‘ + 12 ‘ Name, GoodsBrand__c, GoodsCostPrice__c, GoodsDescribe__c, GoodsName__c,‘ + 13 ‘ GoodsPrice__c, LastActivityDate, LastModifiedById, LastModifiedDate,‘ + 14 ‘ OwnerId, Id, SystemModstamp FROM Goods__c‘; 15 goodsList = Database.query(fetchAllGoods); 16 String fetchAllGoodsSign = ‘SELECT CreatedById, CreatedDate, IsDeleted,‘ + 17 ‘ GoodsBrandDate__c, GoodsCostPriceDate__c, GoodsDescribeDate__c,‘ + 18 ‘ GoodsId__c, GoodsNameDate__c, GoodsPriceDate__c, Name, LastModifiedById,‘ + 19 ‘ LastModifiedDate, OwnerId, Id, SystemModstamp FROM GoodsSign__c‘; 20 goodsSignList = Database.query(fetchAllGoodsSign); 21 for(GoodsSign__c goodsSign : goodsSignList) { 22 if(!goodsSignMap.containsKey(goodsSign.GoodsId__c)) { 23 goodsSignMap.put(goodsSign.GoodsId__c,goodsSign); 24 } 25 } 26 } 27 28 29 public PageReference exportGoods() { 30 String bgColor = ‘red‘; 31 Integer nowMonth = System.today().month(); 32 for(Goods__c currentGoods : goodsList) { 33 GoodsSign__c goodsSign = goodsSignMap.get(currentGoods.Id); 34 GoodsExportObject tempGoodsExportObject = new GoodsExportObject(); 35 tempGoodsExportObject.goodsName = currentGoods.GoodsName__c; 36 tempGoodsExportObject.goodsBrand = currentGoods.GoodsBrand__c; 37 tempGoodsExportObject.goodsPrice = String.valueOf(currentGoods.GoodsPrice__c); 38 tempGoodsExportObject.goodsCostPrice = String.valueOf(currentGoods.GoodsCostPrice__c); 39 tempGoodsExportObject.goodsDescribe = currentGoods.GoodsDescribe__c; 40 if(goodsSign != null) { 41 if(goodsSign.GoodsNameDate__c != null && goodsSign.GoodsNameDate__c.month() == nowMonth) { 42 tempGoodsExportObject.goodsNameColor = bgColor; 43 } 44 if(goodsSign.GoodsBrandDate__c != null && goodsSign.GoodsBrandDate__c.month() == nowMonth) { 45 tempGoodsExportObject.goodsBrandColor = bgColor; 46 } 47 if(goodsSign.GoodsPriceDate__c != null && goodsSign.GoodsPriceDate__c.month() == nowMonth) { 48 tempGoodsExportObject.goodsPriceColor = bgColor; 49 } 50 if(goodsSign.GoodsCostPriceDate__c != null && goodsSign.GoodsCostPriceDate__c.month() == nowMonth) { 51 tempGoodsExportObject.goodsCostPriceColor = bgColor; 52 } 53 if(goodsSign.GoodsDescribeDate__c != null && goodsSign.GoodsDescribeDate__c.month() == nowMonth) { 54 tempGoodsExportObject.goodsDescribeColor = bgColor; 55 } 56 } 57 exportGoodsList.add(tempGoodsExportObject); 58 } 59 60 return new PageReference(‘/apex/ExportGoodsPage‘); 61 } 62 63 64 65 66 }
4.新建显示的VF页面
IsExportPage.page:此VF页面用于显示一个按钮，当点击按钮后，执行Excel生成操作。
1 <apex:page controller="ExportGoodsController"> 2 <apex:form > 3 <apex:commandButton action="{!exportGoods}" value="exportGoods"/> 4 </apex:form> 5 </apex:page>
ExportGoodsPage:生成Excel
1 <apex:page controller="ExportGoodsController" cache="true" contenttype="application/x-excel# GenExcel.xls" showheader="false"> 2 <head> 3 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" /> 4 </head> 5 <apex:dataTable value="{!exportGoodsList}" var="exportGoods" border="1"> 6 <apex:column style="background:{!exportGoods.goodsNameColor};"> 7 <apex:facet name="header">Goods Name </apex:facet> 8 {!exportGoods.goodsName} 9 </apex:column> 10 <apex:column style="background:{!exportGoods.goodsBrandColor};"> 11 <apex:facet name="header">Goods Brand</apex:facet> 12 {!exportGoods.goodsBrand} 13 </apex:column> 14 <apex:column style="background:{!exportGoods.goodsPriceColor};"> 15 <apex:facet name="header">Goods Price</apex:facet> 16 {!exportGoods.goodsPrice} 17 </apex:column> 18 <apex:column style="background:{!exportGoods.goodsCostPriceColor};"> 19 <apex:facet name="header">Goods Cost Price</apex:facet> 20 {!exportGoods.goodsCostPrice} 21 </apex:column> 22 <apex:column style="background:{!exportGoods.goodsDescribeColor};"> 23 <apex:facet name="header">Goods Describe</apex:facet> 24 {!exportGoods.goodsDescribe} 25 </apex:column> 26 </apex:dataTable> 27 </apex:page>
5.配置Button,并显示到列表页面上。
结果样式显示：
点击Goods Reports按钮，跳转到导出 记录的按钮页面
点击exportGoods则可以生成Excel。以下为Excel的生成界面，其中红色为修改的记录字段。
总结：上述demo只是演示当字段Tracking超过20个需要额外创建表的情况处理，当小于20个情况下可以直接通过History的表进行查询，有兴趣的可以自己尝试，生成页面因为使用DataTable，所以对于导出的记录行数有要求，必须不大于1000条，超过则应该会报Error。篇中如果有写的错误的地方欢迎指出，如果有疑问地方欢迎留言，转载请注明出处。
salesforce 零基础学习（二十三）数据记录导出至excel（自定义报表导出）
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原文地址：http://www.cnblogs.com/zero-zyq/p/5507940.html
