java - 将条件转换为自连接的独立条件

Question

我想知道是否可以将此标准转换为独立的标准。我没有正确理解独立的标准。有人可以帮忙吗？

Criteria crit = sessionC.createCriteria(OP_DOCTOR_VISIT.class, "OPDV1");
crit.createAlias("OPDV1.OP_VISIT", "OPDV2", JoinType.LEFT_OUTER_JOIN, Restrictions.and(Restrictions.eq("OPDV2.FORM", "NEW"), Restrictions.ge("OPDV2.USER_DATETIME", fromdate), Restrictions.le("OPDV2.USER_DATETIME", todate)));
    crit.add(Restrictions.ge("OPDV1.USER_DATETIME", fromdate));
    crit.add(Restrictions.le("OPDV1.USER_DATETIME", todate));
    ProjectionList p1 = Projections.projectionList();
    p1.add(Projections.alias(Projections.count("OPDV1.OP_VISIT_ID"), "TOTAL"));
    p1.add(Projections.count("OPDV2.FORM"));
    p1.add(Projections.alias(Projections.sqlGroupProjection("date(this_.USER_DATETIME) as createdDate", "createdDate", new String[]{"createdDate"}, new Type[]{StandardBasicTypes.DATE}), "DAT"));
    crit.setProjection(p1);

是否可以重写上面的内容，以便我可以避免在下面给出的 POJO 中使用“@OneToMany”。

POJO

@Entity
@Table(name = "OP_DOCTOR_VISIT")
@SQLDelete(sql = "UPDATE OP_DOCTOR_VISIT SET DELETED = 'DELETED' WHERE OP_VISIT_ID = ? and VERSION_UPDATES = ?")
@Where(clause = "DELETED <> 'DELETED'")
public class OP_DOCTOR_VISIT implements Serializable {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "OP_VISIT_ID")
private Long OP_VISIT_ID;

@OneToMany(mappedBy = "OP_VISIT_ID", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@LazyCollection(LazyCollectionOption.EXTRA)
@Fetch(FetchMode.SELECT)
private List<OP_DOCTOR_VISIT> OP_VISIT;

    public Long getOP_VISIT_ID() {
        return OP_VISIT_ID;
    }

    public void setOP_VISIT_ID(Long OP_VISIT_ID) {
        this.OP_VISIT_ID = OP_VISIT_ID;
    }

    public List<OP_DOCTOR_VISIT> getOP_VISIT() {
        return OP_VISIT;
    }

    public void setOP_VISIT(List<OP_DOCTOR_VISIT> OP_VISIT) {
        this.OP_VISIT = OP_VISIT;
    }

}

Answer 1

仅限您创建条件对象的第一行。

1. DetachedCriteria 允许您在没有 session 的情况下创建查询。因此，您在构建查询时不需要 session 。 DetachedCriteria 与 Criteria 相同，只是您可以在没有 session 的情况下创建查询。

   DetachedCriteria detachedCriteria = DetachedCriteria.forClass(OP_DOCTOR_VISIT.class);

2. 最后，当 session 对象可用时，您可以执行查询

   `criteria.getExecutableCriteria(session)。