Je suis confronté à un problème très étrange avec les critères d'hibernation dans mon application. Ci-dessous mentionné dans l'extrait de mon code source.hibernate critères requête créer plusieurs sql
Classe Entité
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
@Entity
@Table(name = "AIRPORT")
@Cache(usage = CacheConcurrencyStrategy.READ_ONLY)
public class Airport implements Serializable {
private static final long serialVersionUID = -7120581694566566178L;
private Long id;
private String countryCode;
private String countryName;
private String cityCode;
private String cityName;
private String airportCode;
private String airportName;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "ID", unique = true)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name = "COUNTRY_NAME")
public String getCountryName() {
return countryName;
}
public void setCountryName(String countryName) {
this.countryName = countryName;
}
@Column(name = "COUNTRY_CODE", length = 10)
public String getCountryCode() {
return countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
@Column(name = "CITY_CODE", length = 25)
public String getCityCode() {
return cityCode;
}
public void setCityCode(String cityCode) {
this.cityCode = cityCode;
}
@Column(name = "CITY_NAME")
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName;
}
@Column(name = "AIRPORT_CODE", unique = true, length = 10)
public String getAirportCode() {
return airportCode;
}
public void setAirportCode(String airportCode) {
this.airportCode = airportCode;
}
@Column(name = "AIRPORT_NAME")
public String getAirportName() {
return airportName;
}
public void setAirportName(String airportName) {
this.airportName = airportName;
}
}
Classe DAO
Criteria criteria = getSession().createCriteria(getTemplateClass());
criteria.addOrder(Order.asc("countryCode"));
criteria.addOrder(Order.asc("cityCode"));
criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
criteria.setCacheable(true);
return (List<Airport>) criteria.list();
SQL généré lorsque l'application de démarrage et l'interrogation de résultat
Hibernate: select this_.ID as ID1_12_0_, this_.AIRPORT_CODE as AIRPORT_2_12_0_, this_.AIRPORT_NAME as AIRPORT_3_12_0_, this_.CITY_CODE as CITY_COD4_12_0_, this_.CITY_NAME as CITY_NAM5_12_0_, this_.COUNTRY_CODE as COUNTRY_6_12_0_, this_.COUNTRY_NAME as COUNTRY_7_12_0_ from AIRPORT this_ order by this_.COUNTRY_CODE asc, this_.CITY_CODE asc
Si j'appelle encore le même code et supposons que j'ai la liste 1000 aéroports alors il exécute la requête ci-dessous 1000 fois. Ce comportement est assez étrange.
Hibernate: select airport0_.ID as ID1_12_0_, airport0_.AIRPORT_CODE as AIRPORT_2_12_0_, airport0_.AIRPORT_NAME as AIRPORT_3_12_0_, airport0_.CITY_CODE as CITY_COD4_12_0_, airport0_.CITY_NAME as CITY_NAM5_12_0_, airport0_.COUNTRY_CODE as COUNTRY_6_12_0_, airport0_.COUNTRY_NAME as COUNTRY_7_12_0_ from AIRPORT airport0_ where airport0_.ID=?
Hibernate: select airport0_.ID as ID1_12_0_, airport0_.AIRPORT_CODE as AIRPORT_2_12_0_, airport0_.AIRPORT_NAME as AIRPORT_3_12_0_, airport0_.CITY_CODE as CITY_COD4_12_0_, airport0_.CITY_NAME as CITY_NAM5_12_0_, airport0_.COUNTRY_CODE as COUNTRY_6_12_0_, airport0_.COUNTRY_NAME as COUNTRY_7_12_0_ from AIRPORT airport0_ where airport0_.ID=?
Hibernate: select airport0_.ID as ID1_12_0_, airport0_.AIRPORT_CODE as AIRPORT_2_12_0_, airport0_.AIRPORT_NAME as AIRPORT_3_12_0_, airport0_.CITY_CODE as CITY_COD4_12_0_, airport0_.CITY_NAME as CITY_NAM5_12_0_, airport0_.COUNTRY_CODE as COUNTRY_6_12_0_, airport0_.COUNTRY_NAME as COUNTRY_7_12_0_ from AIRPORT airport0_ where airport0_.ID=?
........
........
Même moi, je me sers ehcache et même la ligne ci-dessous dans mes critères.
criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
Toute aide serait grandement appréciée.
Essayez de supprimer 'setCacheable (true)' –
@JimmyT. Cette solution a fonctionné, mais je ne comprends pas pourquoi le cache crée autant de SQL si le résultat est mis en cache. –
L'entrée de cache pour une requête contient uniquement les ID des objets. Si la requête est trouvée dans le cache, Hibernate recherchera ensuite les objets dans le cache. Si le résultat de la requête est dans le cache mais que les objets ne le sont pas, Hibernate chargera les objets de la base de données via leur ID. –