Question

我有两个用db tables映射的类。

复合主键类：

[!] Error installing TensorFlow-experimental
[!] /Users/moniruzzaman/anaconda3/bin/curl -f -L -o /var/folders/q0/_w6_j9pn3m17k569mj3l1h1r0000gn/T/d20180102-31575-100f04w/file.tgz https://dl.google.com/dl/cpdc/2cf20b661cbb3374/TensorFlow-experimental-1.1.1.tar.gz --create-dirs --netrc-optional

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: https://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.
HTTPS-proxy has similar options --proxy-cacert and --proxy-insecure.

1：LoadProfile

@Embeddable
public class Pk implements Serializable, Cloneable {

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

  @Column(name = "occurrenceTime")
  private Timestamp occurrenceTime;

  public String getDataId() {
    return dataId;
  }

  public Pk setDataId(String dataId) {
    this.dataId = dataId;
    return this;
  }

  public Timestamp getOccurrenceTime() {
    return occurrenceTime;
  }

  public Pk setOccurrenceTime(Timestamp occurrenceTime) {
    this.occurrenceTime = occurrenceTime;
    return this;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    Pk pk = (Pk) o;
    return Objects.equals(getDataId(), pk.getDataId()) &&
        Objects.equals(getOccurrenceTime(), pk.getOccurrenceTime());
  }

  @Override
  public int hashCode() {

    return Objects.hash(getDataId(), getOccurrenceTime());
  }
}

2：ForwardPower

@Entity
@Table(name = "energy")
public class LoadProfile implements Serializable, Cloneable {

  public LoadProfile() {
  }

  @EmbeddedId
  private Pk pk;

  @Column(name = "RECEIVE_TIME")
  private Timestamp reportingTime;

  @Column(name = "DATA1")
  private Double DATA1;


  @OneToOne
  @JoinColumns({
      @JoinColumn(name = "dataId", insertable = false, updatable = false, referencedColumnName = "dataId"),
      @JoinColumn(name = "occurrenceTime", insertable = false, updatable = false, referencedColumnName = "occurrenceTime")
  })
  private ForwardPower forwardPower;

  public Pk getPk() {
    return pk;
  }

  public LoadProfile setPk(Pk pk) {
    this.pk = pk;
    return this;
  }

  public Timestamp getReportingTime() {
    return reportingTime;
  }

  public LoadProfile setReportingTime(Timestamp reportingTime) {
    this.reportingTime = reportingTime;
    return this;
  }

  public Double getDATA1() {
    return DATA1;
  }

  public LoadProfile setDATA1(Double DATA1) {
    this.DATA1 = DATA1;
    return this;
  }

  public ForwardPower getForwardPower() {
    return forwardPower;
  }

  public LoadProfile setForwardPower(
      ForwardPower forwardPower) {
    this.forwardPower = forwardPower;
    return this;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    LoadProfile that = (LoadProfile) o;
    return Objects.equals(getPk(), that.getPk());
  }

  @Override
  public int hashCode() {

    return Objects.hash(getPk());
  }
}

我想执行查询

@Entity
@Table(name = "forward_power")
public class ForwardPower implements  Serializable, Cloneable  {

  public ForwardPower() {
  }

  @EmbeddedId
  private Pk pk;

  @Column(name = "RECEIVE_TIME")
  private Timestamp reportingTime;

  @Column(name = "DATA2")
  private Double DATA2;

  public Pk getPk() {
    return pk;
  }

  public ForwardPower setPk(Pk pk) {
    this.pk = pk;
    return this;
  }

  public Timestamp getReportingTime() {
    return reportingTime;
  }

  public ForwardPower setReportingTime(Timestamp reportingTime) {
    this.reportingTime = reportingTime;
    return this;
  }

  public Double getDATA2() {
    return DATA2;
  }

  public ForwardPower setDATA2(Double DATA2) {
    this.DATA2= DATA2;
    return this;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    ForwardPower that = (ForwardPower) o;
    return Objects.equals(getPk(), that.getPk());
  }

  @Override
  public int hashCode() {

    return Objects.hash(getPk());
  }
}

我使用JPA条件Query

在java中编写了一个等效的Query

Select * From energy e    
Left join forward_power fp    
on fp.dataId== e.dataId and fp.occurrenceTime == e.occurrenceTime    
where     e.occurrenceTime >= '2017-12-28 00:00:00'     
and       e.occurrenceTime <= '2018-01-02 00:00:00'    
Limit 1000;

我设置了选项hibernate.show_sql = true。现在该查询给出了我想要的1000个期望结果。当我看到由上面的代码由ORM生成的hibernate查询。 ORM为能量表创建1个查询，为forwardpower表创建1000个查询，这会导致性能问题，查询需要花费大量时间55 - 60秒才能获取1000条记录。

如何创建条件查询以便ORM为该代码生成1个查询？

提前致谢。

Answer 1

您可以在关系上添加获取类型的热切指令，并且任何LoadProfile.find将使用LoadProfile加载ForwardPower

  @OneToOne(fetch=FetchType.EAGER)
  @JoinColumns({
      @JoinColumn(name = "dataId", insertable = false, updatable = false, referencedColumnName = "dataId"),
      @JoinColumn(name = "occurrenceTime", insertable = false, updatable = false, referencedColumnName = "occurrenceTime")
  })
  private ForwardPower forwardPower;

或者您可以在查询中添加fetch指令。我不熟悉它，但它可能就像那样

//instead of loadProfileRoot.join(LoadProfile_.forwardPower)
Join<LoadProfile, ForwardPower> join = (Join<LoadProfile, ForwardPower>) loadProfileRoot.fetch(LoadProfile_.forwardPower);

有关使用CriteriaBuilder进行提取的详细信息，请参阅JPA 2 Criteria Fetch Path Navigation。

JPA Criteria Query - 如何在单个Query中实现两个表的连接以获得所需的结果

1 个答案: