我试图通过在RapidClipse4中使用本机查询来生成交叉表。 收集了数据，并且在控制台上的输出仍然可用，但是分配给xDevTable无效。 我创建了以下代码：
private void button_buttonClick(final Button.ClickEvent event) {
try {
final String selJahr = this.cmbJahr.getSelectedItem().getBean().getJahr();
final StringBuilder sb = new StringBuilder();
sb.append("select FLOOR(RAND() * 999999) as rid, l1_Id as `l1id`, l1_GroupName as `l1GroupName`, l2_Id as `l2id`, l2_GroupName as `l2GroupName`, ");
sb.append("sum( case when (monat = 1) then dbetrag end ) AS `Jan`, ");
sb.append("sum( case when monat = 2 then dbetrag end ) AS `Feb`, ");
sb.append("sum( case when monat = 3 then dbetrag end ) AS `Mrz`, ");
sb.append("sum( case when monat = 4 then dbetrag end ) AS `Apr`, ");
sb.append("sum( case when monat = 5 then dbetrag end ) AS `Mai`, ");
sb.append("sum( case when monat = 6 then dbetrag end ) AS `Jun`, ");
sb.append("sum( case when monat = 7 then dbetrag end ) AS `Jul`, ");
sb.append("sum( case when monat = 8 then dbetrag end ) AS `Aug`, ");
sb.append("sum( case when monat = 9 then dbetrag end ) AS `Sep`, ");
sb.append("sum( case when monat = 10 then dbetrag end ) AS `Okt`, ");
sb.append("sum( case when monat = 11 then dbetrag end ) AS `Nov`, ");
sb.append("sum( case when monat = 12 then dbetrag end ) AS `Dez`, ");
sb.append("sum(dbetrag) as `Sum` ");
sb.append("from V_HibCrosUmsGiroOpaOmaReport ");
sb.append("where jahr='2019' and konto_Id in ('7,8') ");
sb.append("group by l1_Id, l1_GroupName, l2_Id, l2_GroupName; ");
final String sqlq = sb.toString();
final EntityManagerFactory emf = Persistence.createEntityManagerFactory("RC_07");
final EntityManager em = emf.createEntityManager();
System.out.print( "SQL String: " + sqlq + "/n");
final Query q = em.createNativeQuery(sqlq);
// will be later used:
//q.setParameter(1, selJahr);
//q.setParameter(2, "7,8");
// final List<VUmsCrosstbl> VUmsCrosstbl = q.getResultList();
final XdevBeanItemContainer<VUmsCrosstbl> myContainer = new XdevBeanItemContainer<>(VUmsCrosstbl.class);
myContainer.addAll(q.getResultList());
this.tblUmsCross.setContainerDataSource(myContainer);
this.tblUmsCross.setVisibleColumns(VUmsCrosstbl_.rid.getName(),VUmsCrosstbl_.l1Id.getName(),VUmsCrosstbl_.l1GroupName.getName(),VUmsCrosstbl_.l2Id.getName(),VUmsCrosstbl_.l2GroupName.getName(),VUmsCrosstbl_.jan.getName(),VUmsCrosstbl_.feb.getName(),VUmsCrosstbl_.mrz.getName(),VUmsCrosstbl_.apr.getName(),VUmsCrosstbl_.mai.getName(),VUmsCrosstbl_.jun.getName(),VUmsCrosstbl_.jul.getName(),VUmsCrosstbl_.aug.getName(),VUmsCrosstbl_.sep.getName(),VUmsCrosstbl_.okt.getName(),VUmsCrosstbl_.nov.getName(),VUmsCrosstbl_.dez.getName(),VUmsCrosstbl_.sum.getName());
this.tblUmsCross.setId(VUmsCrosstbl_.rid.getName());
this.tblUmsCross.setColumnHeaders(new String[] {"rid", "l1_Id", "l1_GroupName", "l2_Id", "l2_GroupName", "Jan","Feb","Mrz","Apr","Mai","Jun","Jul","Aug","Sep","Okt","Nov","Dez", "Sum"});
this.tblUmsCross.addItems(q.getResultList());
this.tblUmsCross.getBeanContainerDataSource().refresh();
final List<Object[]> VUmsCrosstbl = q.getResultList();
for (final Object[] a : VUmsCrosstbl) {
System.out.println("Ds: " + a[0] + " " + a[1] + " " + a[2] + " " + a[3] + " " + a[4] + " " + a[5] + " " + a[6] + " " + a[7] + " " + a[8] + " " + a[9] + " " + a[10] + " " + a[11] + " " + a[12] + " " + a[13] + " " + a[14] + " " + a[15]);
}
em.close();
} catch (final Exception e) {
e.printStackTrace();
Notification.show("Do isch was falsch bei button_buttonClick ", e.getMessage(),
Notification.Type.ERROR_MESSAGE);
}
}
该过程运行无误 代码“ System.out.println（“ Ds：...”）末尾的行仅用于检查容器是否有数据。 这些行将在控制台上准确输出预期的输出和所有预期的数据
在应用程序中，仍然创建并显示列（标头），但没有包含数据的行。单元格是空的。
我的错误在哪里/我错了什么？ 任何想法/帮助将不胜感激。
我想，您还应该知道：
我在查询中使用的表名不同于实体名称“ VUmsCrosstbl”
为什么？
我使用的实体名称“ VUmsCrosstbl”是一个db视图，它完全包含了我作为查询结果集而得到的字段。
有了这个技巧，我可以使用Rapidclipse中的实体生成器，它会自动生成实体和dao。
对于我在查询中使用的视图V_HibCrosUmsGiroOpaOmaReport，月份名称Jan-Dez仍然不在我第一次使用的实体或dao中，并产生了另一个错误。
先谢谢您 rgds OpaHeinz
答案 0 :(得分：0)
我自己找到了解决方案：
1）我仍然不确定为什么上面的代码不起作用，我只能假设分配过程中有问题：
myContainer.addAll(q.getResultList());
要使其正常工作，我更改了DAU并放置了以下代码：
public List<VUmsCrosstbl> getAllCrossDataforYearKonto2 ()
{ //final String pjahr, final String pKontoIDs
final StringBuilder sb = new StringBuilder();
sb.append("select FLOOR(RAND() * 999999) as rid, l1_Id, L1_GroupName, l2_Id, L2_GroupName, ");
sb.append("sum( case when (monat = 1) then dbetrag end ) AS `Jan`, ");
sb.append("sum( case when monat = 2 then dbetrag end ) AS `Feb`, ");
sb.append("sum( case when monat = 3 then dbetrag end ) AS `Mrz`, ");
sb.append("sum( case when monat = 4 then dbetrag end ) AS `Apr`, ");
sb.append("sum( case when monat = 5 then dbetrag end ) AS `Mai`, ");
sb.append("sum( case when monat = 6 then dbetrag end ) AS `Jun`, ");
sb.append("sum( case when monat = 7 then dbetrag end ) AS `Jul`, ");
sb.append("sum( case when monat = 8 then dbetrag end ) AS `Aug`, ");
sb.append("sum( case when monat = 9 then dbetrag end ) AS `Sep`, ");
sb.append("sum( case when monat = 10 then dbetrag end ) AS `Okt`, ");
sb.append("sum( case when monat = 11 then dbetrag end ) AS `Nov`, ");
sb.append("sum( case when monat = 12 then dbetrag end ) AS `Dez`, ");
sb.append("sum(dbetrag) as `Sum` ");
sb.append("from V_HibCrosUmsGiroOpaOmaReport ");
sb.append("where jahr= ? and konto_Id in ( ? ) ");
sb.append("group by l1_Id, L1_GroupName, l2_Id, L2_GroupName; ");
final String sqlq = sb.toString();
final Query nativeQuery = em().createNativeQuery(sqlq, VUmsCrosstbl.class);
nativeQuery.setParameter(1, "2019");
nativeQuery.setParameter(2, "7,8");
final List<VUmsCrosstbl> resultList = nativeQuery.getResultList();
return resultList;
}
然后我在按钮的click事件中使用了此函数，将结果分配到XDevBeanitemContainer和表中：
private void button_buttonClick(final Button.ClickEvent event) {
final XdevBeanItemContainer<VUmsCrosstbl> myContainer = new XdevBeanItemContainer<>(VUmsCrosstbl.class);
myContainer.addAll(new VUmsCrosstblDAO().getAllCrossDataforYearKonto2());
this.tblUmsCross.setContainerDataSource(myContainer);
this.tblUmsCross.setId(VUmsCrosstbl_.rid.getName());
this.tblUmsCross.setVisibleColumns(VUmsCrosstbl_.rid.getName(),VUmsCrosstbl_.l1Id.getName(),VUmsCrosstbl_.l1GroupName.getName(),VUmsCrosstbl_.l2Id.getName(),VUmsCrosstbl_.l2GroupName.getName(),VUmsCrosstbl_.jan.getName(),VUmsCrosstbl_.feb.getName(),VUmsCrosstbl_.mrz.getName(),VUmsCrosstbl_.apr.getName(),VUmsCrosstbl_.mai.getName(),VUmsCrosstbl_.jun.getName(),VUmsCrosstbl_.jul.getName(),VUmsCrosstbl_.aug.getName(),VUmsCrosstbl_.sep.getName(),VUmsCrosstbl_.okt.getName(),VUmsCrosstbl_.nov.getName(),VUmsCrosstbl_.dez.getName(),VUmsCrosstbl_.sum.getName());
this.tblUmsCross.setColumnHeaders(new String[] {"rid", "l1_Id", "l1_GroupName", "l2_Id", "l2_GroupName", "Jan","Feb","Mrz","Apr","Mai","Jun","Jul","Aug","Sep","Okt","Nov","Dez", "Sum"});
}
此后，数据在表中可见。
我很高兴能解决这个问题。
rgds
OpaHeinz