queryDSL如何与接口一起工作? [英] How queryDSL works with interface?

问题描述

我有一组实现相同接口的类.例如:

I have a set of classes that implements the same interface. For example:

public interface Employee{
    private String name;

    public void work();
    public String getName();
}

@PersistenceCapable(detachable = "true")
public class Accountant implements Employee{
}


@PersistenceCapable(detachable = "true")
public class Secretary implements Employee{
}

另一个包含Employee实现的类:

And another class that holds the Employee implementations:

public class Department{
     private ArrayList<Employee> employees;

     public ArrayList<Employee> getEmployees();
}

我想获取一个名为"Mary"的雇员的部门列表.我应该如何放置我的jdo查询?我是否在Employee界面上缺少注释?

I want to get a list of Department that has Employee named "Mary". How should I put my jdo query? Am I missing some annotation to the interface Employee?

我怀疑生成的Q类不正确.我有

I suspect the Q class generated is not correct. I got

public final SimplePath<java.util.ArrayList<Employee>>

在生成的Q类中的

.是不是ListPath而不是SimplePath?

in the generated Q class. Shouldn't it be ListPath instead of SimplePath?

推荐答案

这里有两个问题

• Employee未被识别为实体类型，因为它没有被注释
Querydsl中不支持
• ArrayList的列表类型，仅支持Collection接口

• Employee is not recognized as an entity type, since it is not annotated
• ArrayList is not a supported List type in Querydsl, only Collection interfaces are supported

考虑注释Employee并使用List代替ArrayList

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