Hibernate嵌套属性别名

Question

我有这门课：

@Entity
@Table(name = "TOPUP_MESSAGE")
public class ReportFee {
  //... ID & Other Properties
  @ManyToOne
  @JoinColumn(name="CONTRACT_ID")
  private ContractDetail contractDetail;
  //GETTERS AND SETTERS
}

ContractDetail类如下所示：

@Entity
@Table(name = "CONTRACT_DETAIL")
public class ContractDetail {

  //... ID & Other Properties
  @ManyToOne
  @JoinColumn(name = "CONTRACT_ID")
  private Contract contract;
  //GETTERS AND SETTERS
}

@Entity
@Table(name = "CONTRACT")
public class Contract implements {

  //... ID & Other Properties
  @ManyToOne
  @JoinColumn(name = "OPERATOR_ID")
  private Operator operator;
  //GETTERS AND SETTERS
}

Session session = (Session)this.em.getDelegate();
Criteria crit = session.createCriteria(getEntityClass());
crit = crit.createAlias("contractDetail", "cd", JoinType.LEFT_OUTER_JOIN);
crit = crit.createAlias("contract", "c", JoinType.LEFT_OUTER_JOIN);
crit = crit.createAlias("operator", "op", JoinType.LEFT_OUTER_JOIN);

Criterion c= Restrictions.eq("cd.cd.op", operator);

crit.add(c);

List result = crit.list();

----ReportFee (private ContractDetail contractDetail)

       |

        ------ ContractDetail (private Contract contract)

                      |

                       -------- Contract (private Contract contract)

Answer 1

我在如下定义嵌套层次结构时解决了这个问题：

Session session = (Session)this.em.getDelegate();
Criteria crit = session.createCriteria(getEntityClass());
crit = crit.createAlias("contractDetail", "cd", JoinType.LEFT_OUTER_JOIN);
crit = crit.createAlias("cd.contract", "c", JoinType.LEFT_OUTER_JOIN);

Criterion criterion= Restrictions.eq("c.operator", operator);

crit.add(c);

List result = crit.list();