持久化模式，第 2 部分: 提高代码重用和改进性能,更多的现代 ORM 工具策略和最佳实践

@Entity
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn( name="employeeType", discriminatorType=DiscriminatorType.STRING )
public abstract class PayRate extends BaseEntity{//...}

@Entity
@DiscriminatorValue("Salary")
public class SalaryPayRate extends PayRate {//...}

@Entity
@DiscriminatorValue("Hourly")
public class HourlyPayRate extends PayRate {//...}

Criteria crit = session.createCriteria(PayRate.class);
crit.add(Restictions.eq("jobRole", "Programmer");
...
Criteria salaryCrit = session.createCriteria(SalaryPayRate.class);
salaryCrit.add(Restrictions.eq("yearlyRate",50000.00));

public abstract class PayRate extends BaseDomainEntity{

public String getJobRole(){//...}

@OneToMany(cascade = CascadeType.ALL)
@OrderBy("payPeriodBeginDate")
public List<PayCheck> getPayChecks(){//...}

@OneToOne(cascade = CascadeType.ALL)
public Employee getAssociatedEmployee(){//...}

}

@Entity
@DiscriminatorValue("Salary")
public class SalaryPayRate extends PayRate {
private double yearlyRate;
//...
}

Employee example = employeeDao.getNewInstance();
example.setLastName("Smith");
List<Employee> results = employeeDao.getByExample(example);

List<B> getAllByExample(B example) {
Criteria criteria = getCurrentSession().createCriteria(getQueryClass());
Example hibExample = Example.create(example);
return criteria.add(hibExample).list();
}

public List<B> getPageAll(PageInfo pageinfo) {
return getCurrentSession().createCriteria(getQueryClass()).
setFirstResult(pageinfo.getFirstRow()).
setMaxResults(pageinfo.getMaxResults()).list();
}

@ManyToOne(fetch=FetchType.LAZY)
public void getAddress() {

@ManyToOne(fetch=FetchType.EAGER)
public void getAddress() {//...}

Criteria addressCrit = empCrit.createCriteria("payChecks")
.add(Restrictions.eq("hoursWorked", hoursParam));
empCrit.setFetchMode("address",FetchMode.JOIN);
return empCrit.list();

@Entity
@Table(name="ADDRESS")
@BatchSize(size=5)
public class Address extends AuditableEntity {//...}