从数据库内查出的数据和展示数据有所区别，需要列转行

展示数据

通过代码转换，传入从数据库内拿到的12条list<map>

// BEGIN USER CODE
		Map<String, PerformanceYear_Item> map = new HashedMap<>();
		java.util.List<IMendixObject> result = new ArrayList<>();
		try {
			for (PerformanceYear_Item performanceyearitem : PerformanceYearItemlist) {
				map.put(performanceyearitem.getMonth().toString(), performanceyearitem);
			}
			
			System.err.println(map);
			
			IMendixObject item1 = new PerformanceYear_Item(getContext()).getMendixObject();
			item1.setValue(getContext(), PerformanceYear_Item.MemberNames.Unit.name(), "配额单价（元每吨）");
			
			IMendixObject item2 = new PerformanceYear_Item(getContext()).getMendixObject();
			item2.setValue(getContext(), PerformanceYear_Item.MemberNames.Unit.name(), "配额（吨）");

			IMendixObject item3 = new PerformanceYear_Item(getContext()).getMendixObject();
			item3.setValue(getContext(), PerformanceYear_Item.MemberNames.Unit.name(), "CCER单价（元每吨）");

			IMendixObject item4 = new PerformanceYear_Item(getContext()).getMendixObject();
			item4.setValue(getContext(), PerformanceYear_Item.MemberNames.Unit.name(), "CCER（吨）");

			for (int i = 1; i <= 12; i++) {
				String index = ""+ i;
				
				item1.setValue(getContext(), "Item" + i, map.get(index).getItem1());
				item1.setValue(getContext(), "PerformancePlanID", map.get(index).getPerformancePlanID());
				item2.setValue(getContext(), "Item" + i, map.get(index).getItem2());
				item3.setValue(getContext(), "Item" + i, map.get(index).getItem3());
				item4.setValue(getContext(), "Item" + i, map.get(index).getItem4());
			}
			
			result.add(item1);
			result.add(item2);
			result.add(item3);
			result.add(item4);
		} catch (Exception e) {
			e.printStackTrace();
		}
		System.err.println(result.size());
		return result;
		// END USER CODE

 在javaAction中可以通过此方法可以从数据库查询到需要的数据

一个表格内数据经过列转行操作之后展示，此时修改表格内的数据，并更新

1，创建两个非持久化实体类，一对多连线

2，这样可以通过performanceyear_data去获取到performanceyear_item的数据，再通过sql查询出未修改前的数据，更新提交即可

JavaAction中新建对象

IMendixObject name= Core.instantiate(context, 实体类名);