小编Fau*_*mad的帖子

我想问一下,有可能我创建了多个级别的查询预测和标准吗？我有2个模型类:

@Entity  
@Table(name = "person")  
public class Person implements Serializable {
    @Id
    @GeneratedValue
    private int personID;
    private double valueDouble;
    private int valueInt;
    private String name;
    @OneToOne(cascade = {CascadeType.ALL}, orphanRemoval = true)
    @JoinColumn(name="wifeId")
    private Wife wife;
       /*   
        *  Setter Getter    
        */
}


@Entity 
@Table(name = "wife")  
public class Wife implements Serializable {

    @Id
    @GeneratedValue     
    @Column(name="wifeId")
    private int id;
    @Column(name="name")
    private String name;
    @Column(name="age")
    private int age;            
    /*
     *  Setter Getter
     */       
}

我的标准API:

ProjectionList projections = Projections.projectionList(); 
projections.add(Projections.property("this.personID"), "personID");
projections.add(Projections.property("this.wife"), "wife"); …

我在下面查询,查询返回正确的结果,但是当表cslogcurve_datanode中有超过10000行时,My Query需要花费很长时间,我想询问如何为我的查询优化或最好的sintax并且必须返回相同的结果我的查询如下

 SELECT DISTINCT
    (SELECT dataNode FROM cslogcurve_datanode s1 WHERE logCurveInfoUID = 'W-12B-01f34a-lci-1' AND s1.baseNodeDouble = t.baseNodeDouble) AS R1,
    (SELECT dataNode FROM cslogcurve_datanode s1 WHERE logCurveInfoUID = 'W-12B-01f34a-lci-10' AND s1.baseNodeDouble = t.baseNodeDouble) AS R2
     (SELECT dataNode FROM cslogcurve_datanode s1 WHERE logCurveInfoUID = 'W-12B-01f34a-lci-11' AND s1.baseNodeDouble = t.baseNodeDouble) AS R3,
     (SELECT dataNode FROM cslogcurve_datanode s1 WHERE logCurveInfoUID = 'W-12B-01f34a-lci-12' AND s1.baseNodeDouble = t.baseNodeDouble) AS R4,
     (SELECT dataNode FROM cslogcurve_datanode s1 WHERE logCurveInfoUID = 'W-12B-01f34a-lci-13' AND s1.baseNodeDouble = t.baseNodeDouble) AS …