春季5.1.0，休眠5.3.6。
我有实体：
@Entity
@Table(name = "client")
public class Client extends AbstractEntity {
@Column(name = "email", unique = true, updatable = false)
private String email;
@Column(name = "firstName")
private String firstName;
@Column(name = "lastName")
private String lastName;
@JsonIgnore
@Type(type = "text")
@Column(name = "password")
private String password;
@JsonIgnore
@Column(name = "admin")
private boolean admin;
@JoinColumn(name = "premiumId")
@OneToOne(targetEntity = Premium.class, mappedBy = "client", cascade = {CascadeType.MERGE, CascadeType.PERSIST}, fetch = FetchType.LAZY)
private Premium premium;
@JoinColumn(name = "referralId")
@OneToOne(targetEntity = Referral.class, mappedBy = "client", cascade = {CascadeType.MERGE, CascadeType.PERSIST}, fetch = FetchType.LAZY)
private Referral referral;
@JoinColumn(name = "discountId")
@OneToOne(targetEntity = Discount.class, mappedBy = "client", cascade = {CascadeType.MERGE, CascadeType.PERSIST}, fetch = FetchType.LAZY)
private Discount discount;
@PrePersist
protected void onCreate() {
super.onCreate();
this.admin = false;
}
public Client() {}
// getters and setters
@Override
public String toString() {
return "Client{" +
"email='" + email + '\'' +
", firstName='" + firstName + '\'' +
", lastName='" + lastName + '\'' +
", password='" + password + '\'' +
", admin=" + admin +
'}';
}
}
有下一个查询：
@Repository
public class ClientDaoImpl extends AbstractDao implements ClientDao {
private static final Logger LOGGER = LogManager.getLogger(ClientDaoImpl.class);
public ClientDaoImpl(SessionFactory sessionFactory) {
super(sessionFactory);
}
@Override
public List<Client> findAll() {
return sessionFactory.getCurrentSession().createNativeQuery("SELECT * FROM Client c;", Client.class).getResultList();
}
}
问题在于实体Client中的字段具有延迟初始化。但是，当您执行上面的查询时，将加载所有实体。为什么？
SessionFactory：
@Bean
public LocalSessionFactoryBean getSessionFactory() {
LocalSessionFactoryBean factoryBean = new LocalSessionFactoryBean();
factoryBean.setDataSource(getDataSource());
Properties props = new Properties();
props.put("hibernate.dialect", env.getProperty("hibernate.dialect", "org.hibernate.dialect.MariaDBDialect"));
props.put("hibernate.show_sql", env.getProperty("hibernate.show_sql", "true"));
props.put("hibernate.format_sql", env.getProperty("hibernate.format_sql", "true"));
props.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto", "update"));
props.put("hibernate.connection.charSet", env.getProperty("hibernate.connection.charSet", "UTF-8"));
props.put("hibernate.connection.CharSet", env.getProperty("hibernate.connection.CharSet", "UTF-8"));
props.put("hibernate.connection.characterEncoding", env.getProperty("hibernate.connection.characterEncoding", "UTF-8"));
props.put("hibernate.connection.useUnicode", env.getProperty("hibernate.connection.useUnicode", "true"));
props.put("hibernate.enable_lazy_load_on_trans", env.getProperty("hibernate.enable_lazy_load_on_trans", "true"));
props.put("hibernate.id.new_generator_mappings", env.getProperty("hibernate.id.new_generator_mappings", "false"));
props.put("hibernate.hbm2ddl.import_files_sql_extractor", env.getProperty("hibernate.hbm2ddl.import_files_sql_extractor", ""));
factoryBean.setHibernateProperties(props);
factoryBean.setPackagesToScan("app.site.entity");
return factoryBean;
}
我在Scheduled任务中运行查询。没有Jackson。我不叫吸气剂。
Scheduled任务：
@Component
@Transactional
public class PremiumScheduler {
private ClientDao clientDao;
private PremiumDao premiumDao;
private static final Logger LOGGER = LogManager.getLogger(PremiumScheduler.class);
public PremiumScheduler(ClientDao clientDao, PremiumDao premiumDao) {
this.clientDao = clientDao;
this.premiumDao = premiumDao;
}
@Scheduled(cron = "0 */1 * * * *")
public void check() {
LOGGER.info("SCHEDULED");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, -1);
clientDao.findAll().forEach(client -> { // тут
LOGGER.info(client);
});
}
}