需要有关hibernate join的帮助。
问题 - 我有三个hibernate pojo类。 1. ReportRequest 2. AnalysisType 3.申请
我从hibernate创建了表，并且所有表都已成功创建。所以似乎hibernate映射没有问题。
ReportRequest包含复合主键 - ReportRequestPk。 ReportRequest与Application具有“ManyToOne”关系，它也是复合主键的一部分。 ReportRequest也与AnalysisType有“ManyToOne”关系。
我正在尝试将ReportRequest与Application一起加入，以限制Application的appKey属性。它不起作用。但是，如果我尝试将AnalysisType与ReportRequest连接，并对AnalysisType的任何属性有一些限制，那么它正常工作。如果我将Application保留在ReportRequet中，即不是复合主键的一部分，那么对appKey的限制也是完美的。如果Application是复合主键的一部分，则它不起作用。我试过'createAlias'，'fetchMode'，'createCriteria'。请查找pojo类和条件查询的代码段。我不能使用HQL。
@Entity
@Table(name = "t_report_request")
public class ReportRequest implements Serializable {
private static final long serialVersionUID = 1L;
@Id
private ReportRequestPk primaryKey;
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name = "analysis_type", nullable = false)
private AnalysisType analysisType;
}
@Embeddable
public class ReportRequestPk implements Serializable {
private static final long serialVersionUID = 1L;
@Column(name = "key", nullable = false)
private String requestKey;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "application_id", nullable = false)
private Application application;
}
@Entity
@Table(name = "t_analysis_type")
public class AnalysisType {
@Id
@Column
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")
@SequenceGenerator(name = "id_sequence", sequenceName = "ANALYSIS_TYPE_ID_SEQ")
private Integer id;
@Column(name = "description", nullable = false, unique = true)
private String description;
}
@Entity
@Table(name = "t_application")
public class Application {
@Id
@Column
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")
@SequenceGenerator(name = "id_sequence", sequenceName = "APP_ID_SEQ", initialValue = 1)
private int id;
@Column(name = "name", nullable = false, unique = true)
private String name;
@Column(name = "app_key", nullable = false, unique = true)
private String appKey;
}
我根据建议尝试了不同的方式。我也提到了例外情况。
public List retrieveReportRequest（Application application，String requestKey）{
List<ReportRequest> reportRequestList = null;
Criteria criteriaQuery = null;
try {
/*
* First Try
*/
criteriaQuery = sessionFactory.getCurrentSession().createCriteria(ReportRequest.class);
criteriaQuery.setFetchMode("primaryKey.application", FetchMode.JOIN); // not
// working
criteriaQuery.setFetchMode("analysisType", FetchMode.JOIN);
criteriaQuery.add(Restrictions.eq("primaryKey.requestKey", requestKey));
criteriaQuery.add(Restrictions.eq("primaryKey.application.appKey", application.getAppKey()));
reportRequestList = criteriaQuery.list();
} catch(Exception e) {
// could not resolve property: primaryKey.application.appKey of:
// com.tcs.textualanalysis.bean.hibernate.report.ReportRequest
e.printStackTrace();
}
try {
/*
* Second Try
*/
criteriaQuery = sessionFactory.getCurrentSession().createCriteria(ReportRequest.class);
criteriaQuery.createAlias("primaryKey.application", "app"); // not
// working
criteriaQuery.createAlias("analysisType", "at");
criteriaQuery.add(Restrictions.eq("primaryKey.requestKey", requestKey));
criteriaQuery.add(Restrictions.eq("app.appKey", application.getAppKey()));
reportRequestList = criteriaQuery.list();
} catch(Exception e) {
/*
* AnalysisType join working but not the application joining select this_.application_id
* as applicat2_8_1_, this_.key as key1_8_1_, this_.analysis_type as analysis3_8_1_,
* at2_.id as id1_0_0_, at2_.description as descript2_0_0_, at2_.frequency as
* frequenc3_0_0_, at2_.sentiment as sentimen4_0_0_ from t_report_request this_ inner
* join t_analysis_type at2_ on this_.analysis_type=at2_.id where this_.key=? and
* app1_.app_key=? 2015-03-25 00:50:57 WARN SqlExceptionHelper:144 - SQL Error: 0,
* SQLState: 42P01 2015-03-25 00:50:57 ERROR SqlExceptionHelper:146 - ERROR: missing
* FROM-clause entry for table "app1_" Position: 349
*/
e.printStackTrace();
}
try {
/*
* Third Try
*/
criteriaQuery = sessionFactory.getCurrentSession().createCriteria(ReportRequest.class);
criteriaQuery.createCriteria("primaryKey.application", "app"); // not
// working
criteriaQuery.add(Restrictions.eq("primaryKey.requestKey", requestKey));
criteriaQuery.add(Restrictions.eq("app.appKey", application.getAppKey()));
reportRequestList = criteriaQuery.list();
} catch(Exception e) {
/*
* Hibernate: select this_.application_id as applicat2_8_0_, this_.key as key1_8_0_,
* this_.analysis_type as analysis3_8_0_ from t_report_request this_ where this_.key=?
* and app1_.app_key=? 2015-03-25 00:52:53 WARN SqlExceptionHelper:144 - SQL Error: 0,
* SQLState: 25P02 2015-03-25 00:52:53 ERROR SqlExceptionHelper:146 - ERROR: current
* transaction is aborted, commands ignored until end of transaction block
*/
e.printStackTrace();
}
try {
/*
* Fourth Try
*/
criteriaQuery = sessionFactory.getCurrentSession().createCriteria(ReportRequest.class);
criteriaQuery.createCriteria("primaryKey", "app"); // not working
criteriaQuery.add(Restrictions.eq("primaryKey.requestKey", requestKey));
criteriaQuery.add(Restrictions.eq("app.application.appKey", application.getAppKey()));
reportRequestList = criteriaQuery.list();
} catch(Exception e) {
/*
* Criteria objects cannot be created directly on components. Create a criteria on
* owning entity and use a dotted property to access component property: primaryKey
*/
e.printStackTrace();
}
try {
/*
* Fifth Try
*/
criteriaQuery = sessionFactory.getCurrentSession().createCriteria(ReportRequest.class);
criteriaQuery.createCriteria("primaryKey.application", JoinType.FULL_JOIN); // not
// working
criteriaQuery.add(Restrictions.eq("primaryKey.requestKey", requestKey));
criteriaQuery.add(Restrictions.eq("primaryKey.application.appKey", application.getAppKey()));
reportRequestList = criteriaQuery.list();
} catch(Exception e) {
/*
* org.hibernate.QueryException: could not resolve property:
* primaryKey.application.appKey of:
* com.tcs.textualanalysis.bean.hibernate.report.ReportRequest
*/
e.printStackTrace();
}
try {
/*
* Sixth Try
*/
criteriaQuery = sessionFactory.getCurrentSession().createCriteria(ReportRequest.class);
criteriaQuery.createCriteria("primaryKey", JoinType.FULL_JOIN); // not working
criteriaQuery.add(Restrictions.eq("primaryKey.requestKey", requestKey));
criteriaQuery.add(Restrictions.eq("primaryKey.application.appKey", application.getAppKey()));
reportRequestList = criteriaQuery.list();
} catch(Exception e) {
/*
* org.hibernate.QueryException: Criteria objects cannot be created directly on
* components. Create a criteria on owning entity and use a dotted property to access
* component property: primaryKey
*/
e.printStackTrace();
}
try {
/*
* Seventh Try
*/
criteriaQuery = sessionFactory.getCurrentSession().createCriteria(ReportRequest.class);
criteriaQuery.createAlias("primaryKey", "app"); // not
// working
criteriaQuery.createAlias("analysisType", "at");
criteriaQuery.add(Restrictions.eq("primaryKey.requestKey", requestKey));
criteriaQuery.add(Restrictions.eq("app.application.appKey", application.getAppKey()));
reportRequestList = criteriaQuery.list();
} catch(Exception e) {
/*
* org.hibernate.QueryException: Criteria objects cannot be created directly on
* components. Create a criteria on owning entity and use a dotted property to access
* component property: primaryKey
*/
e.printStackTrace();
}
return reportRequestList;
}