我想使用主键获取eventdate的对象。下面是我正在执行的查询

EventData eventData = entityManager.find(EventData.class, eventdataid);

在控制台中执行这个命令之后，我得到的查询是

select eventsajgj0_.FILE_ID as FILE_ID8_14_0_, eventsajgj0_.id as
id1_12_0_, eventsajgj0_.id as id1_12_1_, eventsajgj0_.CODE as CODE2_12_1_,
eventsajgj0_.DATE as DATE3_12_1_, eventsajgj0_.FILE_ID as FILE_ID8_12_1_,
eventsajgj0_.MILLIS as MILLIS4_12_1_, eventsajgj0_.ORDER_NR as
ORDER_NR5_12_1_, eventsajgj0_.TYPE as TYPE6_12_1_, eventsajgj0_.VALUE as
VALUE7_12_1_ from eventdata eventsajgj0_**where eventsajgj0_.FILE_ID=?**
order by eventsajgj0_.ORDER_NR

请注意，上面查询中的where子句是针对文件id（外键）而不是id（eventdata主键）
dao结构如下

public class EventData implements Serializable {

        private static final long serialVersionUID = 1L;

        public EventData() {

        }

        @Id 
        @GeneratedValue(strategy=GenerationType.AUTO)
        private int id;

        @ManyToOne(fetch=FetchType.EAGER)
        @JoinColumn(name="FILE_ID")
        private ApplicationFile file;
       getter & setters

    }

public class ApplicationFile implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id;

    bi-directional many-to-one association to Event
    @OneToMany(mappedBy="file", cascade=CascadeType.ALL, fetch=FetchType.EAGER)
    @OrderBy("orderNr")
    private List<EventData> eventsajgjd;
    getter & setters
}

我的问题是，当我在eventdata表上执行查询时，为什么要使用file\ id而不是id进行查询。
ps：如果我将applicationfile的fetch类型更改为lazy，那么执行的查询是在id上，而不是在文件id上。
（从注解中添加：）

CREATE TABLE eventdata (
    ID int(11) NOT NULL AUTO_INCREMENT, 
    FILE_ID int(11) DEFAULT NULL, 
    PRIMARY KEY (ID), 
    KEY eventdata_ibfk_1 (FILE_ID), 
    CONSTRAINT eventdata_ibfk_1 FOREIGN KEY (FILE_ID)
               REFERENCES files (ID) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=297502 DEFAULT CHARSET=utf8