Grails HQL QuerySyntaxException

Question

我有以下 HQL 查询。当我运行它时，我得到了异常：

org.hibernate.hql.ast.QuerySyntaxException：意外令牌：开启

我的代码如下。有人知道如何解决这个问题吗？

def results = LineItem.executeQuery("\
        select \
            li_ch.eventId as event_id, \
            sum(CASE li_ch.lineItemType WHEN :product THEN 1 WHEN :refund THEN (CASE li_p.lineItemType WHEN :product THEN -1 ELSE 0 END) ELSE 0 END) as sold, \
            sum(li_ch.amount) as gross \
        from \
            LineItem li_ch LEFT JOIN LineItem li_p on li_ch.parentLineItem.id = li_p.id, \
            Sale s \
        where \
            s.id = li_ch.sale.id AND \
            li_ch.eventId in (238141) AND \
            s.saleStatusType in (:paid, :refunded, :partialRefunded) AND \
            li_ch.lineItemType in (:product, :refund)  \
        group by li_ch.eventId", [product: LineItemType.PRODUCT, refund: LineItemType.REFUND, paid: SaleStatusType.PAID, refunded: SaleStatusType.REFUNDED, partialRefunded: SaleStatusType.PARTIAL_REFUND])

这给出了以下异常：

[2014-08-21 09:34:52,666] hql.PARSER line 1:371: unexpected token: on
[2014-08-21 09:34:52,685] errors.GrailsExceptionResolver QuerySyntaxException occurrwhen processing request: [GET] /inventory/events/salesData - parameters:
eventIds: 238141
unexpected token: on near line 1, column 371 [            select                 li_ch.eventId as event_id,                 sum(CASE li_ch.lineItemType WHEN :product THEN 1 WHEN :refund THEN (CASE li_p.lineItemType WHEN :product THEN -1 ELSE 0 END) ELSE 0 END) as sold,                 sum(li_ch.amount) as gross             from                 com.acme.inventory.domain.LineItem li_ch LEFT JOIN LineItem li_p on li_ch.parentLineItem.id = li_p.id,                 com.acme.inventory.domain.Sale s             where                 s.id = li_ch.sale.id AND                 li_ch.eventId in (238141) AND                 s.saleStatusType in (:paid, :refunded, :partialRefunded) AND                 li_ch.lineItemType in (:product, :refund)              group by li_ch.eventId]. Stacktrace follows:
org.hibernate.hql.ast.QuerySyntaxException: unexpected token: on near line 1, column 371 [            select                 li_ch.eventId as event_id,                 sum(CASE li_ch.lineItemType WHEN :product THEN 1 WHEN :refund THEN (CASE li_p.lineItemType WHEN :product THEN -1 ELSE 0 END) ELSE 0 END) as sold,                 sum(li_ch.amount) as gross             from                 com.acme.inventory.domain.LineItem li_ch LEFT JOIN LineItem li_p on li_ch.parentLineItem.id = li_p.id,                 com.acme.inventory.domain.Sale s             where                 s.id = li_ch.sale.id AND                 li_ch.eventId in (238141) AND                 s.saleStatusType in (:paid, :refunded, :partialRefunded) AND                 li_ch.lineItemType in (:product, :refund)              group by li_ch.eventId]
at com.acme.inventory.services.SaleRestService$$EOnaEzWy.eventSaleData(SaleRestService.groovy:15)
at com.acme.inventory.controllers.SaleRestController.eventSaleData(SaleRestController.groovy:13)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:695)

Answer 1

完整的例外可能会有所帮助，但我猜这与：

• 14.3. Associations and joins

我们不允许在 JOIN 语句中使用 ON 关键字。这是由映射驱动的。

我们可以做的是扩展生成的 ON (generated by Hibernate based on mapping) - 但为此我们有一个关键字 WITH。所以这应该会有所帮助：

代替：

// wrong
from
  LineItem li_ch LEFT JOIN LineItem li_p on li_ch.parentLineItem.id = li_p.id, 

// extend the JOIN condition using WITH
from
  LineItem li_ch LEFT JOIN LineItem li_p with li_ch.parentLineItem.id = li_p.id,