jpaリポジトリ/ Hibernateが同じクエリをコンソールに書き込む理由

Question

なぜjpaリポジトリが同じクエリをEclipseコンソールに書き込むのですか？ テーマをたくさん勉強していますか？

Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_,  technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 
Hibernate: select technicald0_.CTC_ID as CTC_ID1_7_0_, technicald0_.CTC_PANIER_CLASSIF as CTC_PANI9_7_0_, technicald0_.CTC_PANIER_STAT as CTC_PAN10_7_0_, technicald0_.VEH_COMMENTAIRE_TECH as VEH_COMM2_7_0_, technicald0_.CTC_NBR_DIFFUS as CTC_NBR_3_7_0_, technicald0_.VEH_GENERATION_TECH as VEH_GENE4_7_0_, technicald0_.CTC_DATE_MODIFICATION as CTC_DATE5_7_0_, technicald0_.CTC_MODIFICATEUR_ID as CTC_MOD11_7_0_, technicald0_.VEH_PHASE as VEH_PHAS6_7_0_, technicald0_.VEH_ETAT as VEH_ETAT7_7_0_, technicald0_.VEH_PONDERATION as VEH_POND8_7_0_ from SRA_COTA_TECHNIQUES technicald0_ where technicald0_.CTC_ID=? 

私のクエリがあるのです：

Cart findByRefVehicle(VehicleFinalized one); 

私は、TechnicalData

にTechnicalDataとVehicleFinalizedへカートbeetween関係

私のエンティティクラスがあるがカートクラス& & VehicleFinalzedクラス& & TechnicalDataクラスがありますしています：

import javax.persistence.CascadeType; 
import javax.persistence.Column; 
import javax.persistence.DiscriminatorValue; 
import javax.persistence.Entity; 
import javax.persistence.FetchType; 
import javax.persistence.ForeignKey; 
import javax.persistence.JoinColumn; 
import javax.persistence.NamedAttributeNode; 
import javax.persistence.NamedEntityGraph; 
import javax.persistence.NamedEntityGraphs; 
import javax.persistence.NamedSubgraph; 
import javax.persistence.OneToOne; 
import javax.persistence.Table; 
import javax.persistence.UniqueConstraint; 
import javax.transaction.NotSupportedException; 

import com.normasys.entity.reference.Brand; 
import com.normasys.entity.reference.Model; 
import com.normasys.entity.technical.TechnicalData; 


@SuppressWarnings("serial") 
@Entity 
@Table(name = "SRA_VEHICULE_FIN", uniqueConstraints = {  @UniqueConstraint(name = "UNIQUE_VEH_FIN_SRA", columnNames = { "VEH_CODE_SRA" }) }) 
@DiscriminatorValue(Environment.FINAL) 
@NamedEntityGraphs({ 
@NamedEntityGraph(name = "VehicleFinalized.full", attributeNodes = {  @NamedAttributeNode("bodywork"), @NamedAttributeNode("supply"), 
     @NamedAttributeNode("energy"), @NamedAttributeNode("price"), @NamedAttributeNode("classification"), @NamedAttributeNode("identification"), 
     @NamedAttributeNode("motorization"),  @NamedAttributeNode("suspensionAndBraking"), @NamedAttributeNode("dimensionAndWeight"), 
     @NamedAttributeNode("securityElement"),  @NamedAttributeNode("drivingAssistance") }, 
     subclassSubgraphs = @NamedSubgraph(name = "VehicleFinalized.full.model", attributeNodes = { @NamedAttributeNode("brand") })), 
     @NamedEntityGraph(name = "VehicleFinalized.properties_only", attributeNodes = { @NamedAttributeNode("bodywork"),  @NamedAttributeNode("supply"), 
       @NamedAttributeNode("energy") }) }) 
public class VehicleFinalized extends AbstractVehicle { 

// private static final Logger LOGGER = Logger.getLogger(VehiculeFinalized.class); 

@JoinColumn(name = "VEH_CREATE_FROM", nullable = true, foreignKey =   @ForeignKey(name = "FK_VEH_FIN_CRF")) 
@OneToOne(fetch = FetchType.LAZY, optional = true, orphanRemoval = true) 
private Vehicle createdFrom; 

@Column(name = "VEH_CODE_SRA", length = 7, nullable = false, unique = true) 
private String codeSRA; 

@Column(name = "VEH_NUM_ORDRE", nullable = false) 
private Integer orderNumber; 

@Column(name = "VEH_CODE_SEQUENCE") 
private Integer sequenceCode; 

@JoinColumn(name = "VEH_PRIX_COUT", nullable = false, foreignKey = @ForeignKey(name = "FK_VEH_FIN_PCF")) 
@OneToOne(fetch = FetchType.EAGER, optional = false, orphanRemoval = true, cascade = CascadeType.ALL) 
protected PriceFinalized price = new PriceFinalized(); 

@JoinColumn(name = "VEH_CLASSIFICATION", nullable = false, foreignKey = @ForeignKey(name = "FK_VEH_FIN_CLS")) 
@OneToOne(fetch = FetchType.EAGER, optional = false, orphanRemoval = true, cascade = CascadeType.ALL) 
protected ClassificationFinalized classification = new ClassificationFinalized(); 

@JoinColumn(name = "VEH_DONNEE_TECHNIQUE", nullable = false, foreignKey = @ForeignKey(name = "FK_VEH_FIN_CTC")) 
@OneToOne(fetch = FetchType.EAGER, optional = false, orphanRemoval = true, cascade = { CascadeType.PERSIST, CascadeType.DETACH, CascadeType.REFRESH, 
     CascadeType.REMOVE }) 
protected TechnicalData technicalData = new TechnicalData(); 

public VehicleFinalized() { 
} 

public VehicleFinalized(final VehicleFinalized vehicle) { 
    environment = Environment.FINAL; 

    createdFrom = vehicle.getCreatedFrom(); 
    codeSRA = vehicle.getCodeSRA(); 
    orderNumber = vehicle.getOrderNumber(); 
    sequenceCode = vehicle.getSequenceCode(); 

    price = vehicle.getPrice().clone(); 
    classification = vehicle.getClassification().clone(); 
    technicalData = vehicle.getTechnicalData().clone(); 

    copyFields(vehicle); 
} 

public VehicleFinalized(final Vehicle vehicle, final Integer sequenceCode, final Integer orderNumber) throws NotSupportedException { 
    createdFrom = vehicle; 
    environment = Environment.FINAL; 
    this.sequenceCode = sequenceCode; 
    this.orderNumber = orderNumber; 

    copyFields(vehicle); 

    codeSRA = VehicleFinalizedUtil.generateCodeSRA(model.getBrand().getCode(), model.getCode(), sequenceCode); 
    price = new PriceFinalized(vehicle.getPrice()); 
    classification = new ClassificationFinalized(vehicle.getClassification()); 

} 




public VehicleFinalized(final Long id, final String codeSRA, final String model, final String brand) { 
    super(); 
    setId(id); 
    this.codeSRA = codeSRA; 
    this.model = new Model(); 
    this.model.setTitle(model); 
    this.model.setBrand(new Brand()); 
    this.model.getBrand().setTitle(brand); 
} 

@Override 
public boolean calculateCompleted() { 
    return uncompleted == 0 || getBrand() != null && model != null && bodywork != null && supply != null && energy != null && version != null 
      && administrativePower != null 
      && identification.calculateCompleted() && motorization.calculateCompleted() && suspensionAndBraking.calculateCompleted() 
      && dimensionAndWeight.calculateCompleted() && securityElement.calculateCompleted() && price.calculateCompleted() 
      && classification.calculateCompleted() && drivingAssistance.calculateCompleted(); 
} 

public Vehicle getCreatedFrom() { 
    return createdFrom; 
} 

public void setCreatedFrom(final Vehicle createdFrom) { 
    this.createdFrom = createdFrom; 
} 

public String getCodeSRA() { 
    return codeSRA; 
} 

public void setCodeSRA(final String codeSRA) { 
    this.codeSRA = codeSRA; 
} 

public Integer getOrderNumber() { 
    return orderNumber; 
} 

public void setOrderNumber(final Integer orderNumber) { 
    this.orderNumber = orderNumber; 
} 

@Override 
public PriceFinalized getPrice() { 
    return price; 
} 

public void setPrice(final PriceFinalized price) { 
    this.price = price; 
} 

@Override 
public ClassificationFinalized getClassification() { 
    return classification; 
} 

public void setClassification(final ClassificationFinalized classification) { 
    this.classification = classification; 
} 

public TechnicalData getTechnicalData() { 
    return technicalData; 
} 

public void setTechnicalData(final TechnicalData technicalData) { 
    this.technicalData = technicalData; 
} 

public Integer getSequenceCode() { 
    return sequenceCode; 
} 

public void setSequenceCode(final Integer sequenceCode) { 
    this.sequenceCode = sequenceCode; 
} 

@Override 
public void setCompletedFlag() { 
    uncompleted = calculateCompleted() ? 0 : 1; 

} 

Answer 1

実際には、フェッチ戦略をどのように構成するかによって異なります。

属性がEagerに設定されている場合は、オブジェクトをロードするたびに、関連付けられたオブジェクトをロードしてデータベースに要求します。関連オブジェクトをロードしたくない場合は、Lazy戦略を使用できます。

最後に、同じリクエスティングを数回再生しないように、休止状態のキャッシュを構成することもできます。