如果不允许ON-CLAUSE，如何在JPQL中替换LEFT OUTER JOIN？

Question

我将相当复杂的SQL查询转换为JPQL。突然之间，我发现因为我在2.0之前的OPENJPA 1.2.8的版本，ON-Clause不起作用。所以，很可能我不能使用Left Open Join。在这种情况下，什么是最好的策略？

JPQL查询：

select priceListTerm.SELLING_PRICE, priceListTerm.COMMISSION_FORMAT, priceListTerm.COMMISSION,  
priceListAssignment.EFF_START_DATE, priceListAssignment.EFF_END_DATE, 
priceListAssignment.PRIORITY_LEVEL, 
venue.CODE, tb.HEADQUARTERS, vendor.NAME from PriceListTerm priceListTerm
JOIN PriceList priceList on priceListTerm.PRICELIST_UID = priceList.UIDPK
JOIN ProductSku productsku on priceListTerm.PRODUCTSKU_UID=productsku.UIDPK
LEFT OUTER JOIN 
(PriceListAssignment priceListAssignment JOIN Venue venue on   
 priceListAssignment.VENUE_UID=venue.UIDPK
 JOIN Vendor vendor on vendor.UIDPK=venue.VENDOR_UID)
on priceListAssignment.PRICELIST_UID = priceList.uidpk
where productsku.skuCode= :sku 
and (vendor.name is null or vendor.name= :vendor)
order by priceListAssignment.PRIORITY_LEVEL;

Answer 1

我最终使用了原生查询。所以有效的代码块如下：

...........
query = entityManager.createNativeQuery(GET_LOGICAL_SQL);

List<Object[]> list  = query.setParameter(1, skuCode).setParameter(2, vendorName).getResultList();

for (Object[] objects : list){
    BigDecimal sellingPrice = (BigDecimal)objects[0];
...........