Hibernate字段注释行为

Question

请帮助我理解为什么基于hibernate字段的注释基于primarykey字段工作？ 模型类1 也会从getter和 Model Class 2 中获取docnum字段值。尽管两个地方仅基于getter注释docnum 。它基于id字段工作，该字段在 Model Class 2 和 Model Class 1 字段中注释基于getter。

模型类1：

@Entity(name="RDT_ORDER")
public class Order {

private int id;
private String docnum;

@Id
@Column(name="ORDID")    
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
@Column(name="ORD_DOCNUM")
public String getDocnum() {
    return docnum+" getter";
}
public void setDocnum(String docnum) {
    this.docnum = docnum;
}
}

模型类2：

@Entity(name="RDT_ORDER")
public class Order {

private int id;
private String docnum;

@Id
@Column(name="ORDID")    
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
@Column(name="ORD_DOCNUM")
public String getDocnum() {
    return docnum+" getter";
}
public void setDocnum(String docnum) {
    this.docnum = docnum;
}
}

输出：表格（RDT_ORDER）值

ID       DOCNUM
5       docnum5 
6       docnum6 getter