Question

我遇到了hibernate生成的HSQL语句的问题，其中，当获取实体及其一对多的对应项时，Select查询具有DUPLICATE列。我的类定义如下所示;

@javax.persistence.Entity
@Table(name = "SCHOOL")
public Class School implements Serializable {
   @Id
   private long id;

   @Column(name="NAME")
   private String name;

   @Column(name="ZIP_CODE")
   private String zipCode;

   @OneToMany
   @JoinColumn(name="NAME", referencedColumnName="SCHOOL_NAME")
   private Set<Student> students= new HashSet<Student>();

  /*
   *
   *followed by other variable definitions, getters and setters
   */
}



@javax.persistence.Entity
@Table(name = "STUDENT")
public Class Student implements Serializable {
    @Id
    private long id;

    @Column(name="FNAME")
    private String fName;

    @Column(name="LNAME")
    private String lName;

    @Column(name="SCHOOL_NAME")
    private String schoolName;

    @Column(name="DOB")
    private Date dateOfBirth;

   /*
    *
    *followed by other variable definitions, getters and setters
    */
}

我有以下标准，以特定的邮政编码取得学校和相应的学生。

Criteria criteria = session.createCriteria(School.class); 
criteria.add(Restrictions.in("zipCode", 56789));
List<School> schools = criteria.list();

以上条件是在后台生成以下HSQL，并在SELECT查询中为STUDENT列提供重复的列条目。

select
    this_.ZIP_CODE as ZIP_CODE1_16_3_,
    this_.name as NAME_16_3_,
    this_.LICENSE_NUM as LICENSE_N3_16_3_,

    student3_.FNAME as ZIP_CODE1_16_5_,
    student3_.LNAME as NAME_16_5_,
    student3_.GRADE as GRADE4_16_5_,
    student3_.ETHNICITY as ETHNICITY5_16_5_,
    student3_.SCHOOL_NAME as SCHOOL_NA6_16_5_,

    student3_.FNAME as ZIP_CODE1_14_5_,
    student3_.LNAME as NAME_14_5_,
    student3_.GRADE as GRADE4_14_5_,
    student3_.ETHNICITY as ETHNICITY5_14_5_,
    student3_.SCHOOL_NAME as SCHOOL_NA6_14_5_,

    student3_.FNAME as ZIP_CODE1_14_1_,
    student3_.LNAME as NAME_14_1_,
    student3_.GRADE as GRADE4_14_1_,
    student3_.ETHNICITY as ETHNICITY5_14_1_,
    student3_.SCHOOL_NAME as SCHOOL_NA6_14_1_
from
    SCHOOL this_,
    STUDENT student3_
where
    and this_.name=student3_.SCHOOL_NAME(+)
    and this_.ZIP_CODE=56789;

（上面的查询在此处发布之前已稍微调整过一点。）

请建议一个解决方案，我可以使用它解决SELECT查询中的重复列。

注意：我使用的是hibernate 4.2.7和hibernate-jpa-2.0-api

Hibernate中的重复列生成了Select Query

0 个答案: