通过嵌入式ID查找的JPA存储库不起作用

Question

在存储库中：

@Transactional
public interface DeptMagrRepository extends CrudRepository<DepartmentManager, DeptMangrKey>{
  //1
  public List<DepartmentManager> findByDeptMangrKeyDepartmentDeptNo(String deptNo);
  //2
  public List<DepartmentManager> findByDeptMangrKeyEmployeeEmpNo(Integer empNo);
  //3
  public List<DepartmentManager> findByDeptMangrKey_Employee_EmpNoAndDeptMangrKey_Department_DeptNo(Integer empNo, String deptNo);
}

我能够使用第一个和第二个功能获得正确的答案。 但是第三个函数总是返回空结果。

例如，使用第一个功能，输入为d008，它是部门编号之一，结果为：

[
  {
    "deptMangrKey": {
  "department": {
    "deptNo": "d008",
    "deptName": "Research"
  },
  "employee": {
    "birth_date": "1959-11-09",
    "first_name": "Arie",
    "last_name": "Staelin",
    "gender": "M",
    "hire_date": "1985-01-01",
    "emp_no": 111400
  }
},
    "fromDate": "1985-01-01",
    "toDate": "1991-04-08"
  },
{
"deptMangrKey": {
  "department": {
    "deptNo": "d008",
    "deptName": "Research"
  },
  "employee": {
    "birth_date": "1952-06-27",
    "first_name": "Hilary",
    "last_name": "Kambil",
    "gender": "F",
    "hire_date": "1988-01-31",
    "emp_no": 111534
  }
},
  "fromDate": "1991-04-08",
  "toDate": "9999-01-01"
}
]

当我调用第二个函数时，输入为111400，这是emp_no，我得到了结果：

[
  {
    "deptMangrKey": {
      "department": {
        "deptNo": "d008",
        "deptName": "Research"
      },
      "employee": {
        "birth_date": "1959-11-09",
        "first_name": "Arie",
        "last_name": "Staelin",
        "gender": "M",
        "hire_date": "1985-01-01",
        "emp_no": 111400
      }
    },
      "fromDate": "1985-01-01",
      "toDate": "1991-04-08"
  }
]

但是当我调用第三个函数时，输入是111400和d008，结果为空，为什么会发生这种情况？

Answer 1

我解决了这个问题，并在GitHub上发布了一个问题。 这是链接： https : //github.com/YingcaiDong/Practical-Company-Employee-data-API/issues/6