我正在使用 Toplink Essentials (JPA) + GlassFish v3 + NetBean 6.9
我有一张带有复合主键的表:
table (machine)
----------------
|PK machineId |
|PK workId |
| |
|______________|
我为实体本身创建了 2 个实体类,第二个是 PK 类。
public class Machine {
@EmbeddedId
protected MachinePK machinePK;
//getter setters of fields..
}
public class MachinePK {
@Column(name = "machineId")
private String machineId;
@Column(name = "workId")
private String workId;
}
现在..我如何用 WHERE 用 JPQL 编写 SELECT 子句???
这失败了。
SELECT m FROM Machine m WHERE m.machineId = 10
http://www.mail-archive.com/users@openjpa.apache.org/msg03073.html
根据网页,添加“val”?不,它也失败了。
SELECT m FROM Machine m WHERE m.machineId.val = 10
在这两种情况下,错误都是:
Exception Description: Error compiling the query
[SELECT m FROM Machine m WHERE m.machineId.val = 10],
line 1, column 30: unknown state or association field
[MachineId] of class [entity.Machine].