java-tutorials/hibernate5/src/test/java/com/baeldung/hibernate/CustomClassIntegrationTest.java

package com.baeldung.hibernate;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.IOException;
import java.util.List;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.query.Query;
import org.hibernate.transform.Transformers;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import com.baeldung.hibernate.entities.Department;
import com.baeldung.hibernate.entities.Manager;
import com.baeldung.hibernate.pojo.Result;

class CustomClassIntegrationTest {

    private Session session;

    private Transaction transaction;

    @BeforeEach
    public void setUp() throws IOException {
        session = HibernateUtil.getSessionFactory().openSession();
        transaction = session.beginTransaction();
        session.createNativeQuery("delete from manager").executeUpdate();
        session.createNativeQuery("delete from department").executeUpdate();
        Department department = new Department("Sales");
        Manager employee = new Manager("John Smith", "001", department);
        session.persist(department);
        session.persist(employee);
        transaction.commit();
        transaction = session.beginTransaction();
    }
    
    @Test
    public void whenAllManagersAreSelected_ThenObjectGraphIsReturned() {
        Query<Manager> query = session.createQuery("from com.baeldung.hibernate.entities.Manager");
        List<Manager> managers = query.list();
        Manager manager = managers.get(0);
        assertEquals("John Smith", manager.getName());
        assertEquals("Sales", manager.getDepartment().getName());
    }
    
    @Test
    public void whenIndividualPropertiesAreSelected_ThenObjectArrayIsReturned() {
        Query query = session.createQuery("select m.name, m.department.name from com.baeldung.hibernate.entities.Manager m");
        List managers = query.list();
        Object[] manager = (Object[]) managers.get(0);
        assertEquals("John Smith", manager[0]);
        assertEquals("Sales", manager[1]);
    }
    
    @Test
    public void whenResultConstructorInSelect_ThenListOfResultIsReturned() {
        Query<Result> query = session.createQuery("select new com.baeldung.hibernate.pojo.Result(m.name, m.department.name) from Manager m");
        List<Result> results = query.list();
        Result result = results.get(0);
        assertEquals("John Smith", result.getEmployeeName());
        assertEquals("Sales", result.getDepartmentName());
    }
    
    @Test
    public void whenResultTransformerOnQuery_ThenListOfResultIsReturned() {
        Query query = session.createQuery("select m.name as employeeName, m.department.name as departmentName from com.baeldung.hibernate.entities.Manager m");
        query.setResultTransformer(Transformers.aliasToBean(Result.class));
        List<Result> results = query.list();
        Result result = results.get(0);
        assertEquals("John Smith", result.getEmployeeName());
        assertEquals("Sales", result.getDepartmentName());   
    }
}