Eclipselink 聚合和构造函数问题

Question

我正在使用 Eclipselink 2.2.1.v20110722-r9776

我有以下疑问：

TypedQuery<FundMasterDTO> secQuery = em.createQuery("SELECT new com.dto.FundMasterDTO("+" sum(appAmount), sum(redemptionPrice) from security", FundMasterDTO.class);

我收到以下错误：

Exception Description: Syntax error parsing the query [SELECT new com.dto.FundMasterDTO( sum(app_amount), sum(redemption_price) from security], line 1, column 80: syntax error at [from].

Internal Exception: MissingTokenException(inserted [@-1,0:0='<missing RIGHT_ROUND_BRACKET>',<84>,1:80] at from); nested exception is java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager: 

如果我不使用聚合函数 SUM，那么一切正常。如果我删除构造函数，那么我会得到一个列表。

Answer 1

如消息所述，您缺少右圆括号：

SELECT new com.dto.FundMasterDTO( sum(app_amount), sum(redemption_price)) ...
                                                two parentheses here ---^