JPA NamedQuery-传递的字段为null时忽略行

时间:2018-10-25 12:29:22

标签: spring hibernate jpa entitymanager named-query

所以我有一个NamedQuery,其中的字段是通过repo通过enityManager.createNamedQuery传递的。

所以我有两个字段,areaId和fieldId,areaId将始终存在,但fieldId有时为null。

如果:fieldId为空,如何省略(删除)以下行

and summary.bucket.fieldId.id = :fieldId --line to be removed

以下是我尝试使用案例方案的尝试,但这不起作用。

我愿意接受最好的方法或指导吗?

 @NamedQuery(name = "SummaryBySubstatus.getInfo",
            query = "select new com.model.group.summaryGroup(summary.bucket.area.id,"
                    summary.bucket.facilityProductInfo,
                    from SummaryBySubstatus as summary
                    where summary.bucket.area.id = :areaId
                    and summary.bucket.fieldId.id = :fieldId
                    ---Tried This way---
                    and(case when :fieldId != null then summary.bucket.fieldId.id = :fieldId end)"

1 个答案:

答案 0 :(得分:0)

and summary.bucket.fieldId.id = :fieldId

fieldId在兼容数据库(非MySQL)上为null时,它将始终为false。试试

where summary.bucket.area.id = :areaId
and ( :fieldId IS NOT NULL AND summary.bucket.fieldId.id = :fieldId
or :fieldId IS NULL AND summary.bucket.fieldId.id = :fieldId )

如果您使用的是PostgreSQL,则有一个错误需要通过调用来绕过

query.setParameter("fieldId", not_null_value_of_the_same_type);
query.setParameter("fieldId", the_real_value_that_can_be_null);

或者您可以只创建两个查询。