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Question

映射集独立标准我有三个表Student，Department，Student_Detail

Table Student 
-------------- 
std_id (pk) 

Table Student_Detail 
-------------- 
std_id (pk) 
Dept_ID (pk) 

Table Department 
-------------- 
Dept_ID (pk) 

为Student.hbm.xml

<map name="studentDetails" table="STUDENT_DETAIL" lazy="false" > 
<key column = "std_id"> 
<map-key-many-to-many column="Dept_ID" class="Department"> 
<element column="Remarks" type="string"/> 
</map> 

现在我想的映射写detachedCriteria查询

select * from student S 
JOIN Student_Detail SD ON SD.std_id = S.std_Id 
JOIN Department D ON D.dept_Id = SD.dept_Id 
where AND D.name = 'x' and SD.remarks ='x' 

Answer 1

F如果你的hibernate映射正确的话，应该可以使用DetachedCriteria！

DetachedCriteria detachedCriteria = DetachedCriteria.forClass(
      Student.class, "studentAlias"); 
    detachedCriteria.createAlias("details", "detailsAlias")// details is collection of `StudentDetail` in `Student` class 
      .createAlias("detailsAlias.department", "departmentAlias")//department is `Department` type variable in `StudentDetail` 
      .add(Restrictions.eq("detailsAlias.remarks", "x")) 
      .add(Restrictions.eq("departmentAlias.name", "x")); 
    List<Student> list = detachedCriteria 
      .getExecutableCriteria(hibernateSession).setMaxResults(100) 
      .list(); 

为了这个，我创建的类Student，Department，StudentDetail类以下注释。

@Entity 
@Table(name = "student") 
public class Student { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private Long std_id; 

    @OneToMany(mappedBy = "student", fetch = FetchType.LAZY) 
    @Fetch(FetchMode.SELECT) 
    private List<StudentDetail> details; 
    // getter/setters 
} 

@Entity 
@Table(name = "department") 
public class Department { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private Long Dept_ID; 

    private String name; 

    private String remarks; 
    // getter/setters 
} 


@Entity 
@Table(name = "student_detail") 
public class StudentDetail { 
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private Long id; 

    @ManyToOne 
    @JoinColumn(name = "std_id") 
    @Fetch(FetchMode.SELECT) 
    private Student student; 

    @ManyToOne 
    @JoinColumn(name = "Dept_ID") 
    @Fetch(FetchMode.SELECT) 
    private Department department; 

    private String remarks; 
    // getter/setters 
}