Bael 7648 (#16176)

* BAEL-7490 read write file in separate thread

* Change the to try resources

* Update the code to sync with article

* added new module for get list entity in hibernate

* Move the code to hibernate-queries module

* simplify the code

persistence-modules/hibernate-queries/src/main/java/com/baeldung/hibernate/listentity/entity/Department.java

@@ -0,0 +1,40 @@
+package com.baeldung.hibernate.listentity.entity;
+
+import java.util.List;
+import jakarta.persistence.*;
+
+@Entity
+public class Department {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String name;
+
+    @OneToMany(mappedBy = "department", fetch = FetchType.EAGER)
+    private List<Employee> employees;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<Employee> getEmployees() {
+        return employees;
+    }
+
+    public void setEmployees(List<Employee> employees) {
+        this.employees = employees;
+    }
+}

persistence-modules/hibernate-queries/src/main/java/com/baeldung/hibernate/listentity/entity/Employee.java

@@ -0,0 +1,41 @@
+package com.baeldung.hibernate.listentity.entity;
+
+import jakarta.persistence.*;
+
+@Entity
+@NamedQuery(name = "findAllEmployees", query = "SELECT e FROM Employee e")
+@NamedQuery(name = "findEmployeesByDepartment", query = "SELECT e FROM Employee e WHERE e.department = :department ORDER BY e.lastName ASC")
+public class Employee {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    private String lastName;
+
+    private String department;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public String getDepartment() {
+        return department;
+    }
+
+    public void setDepartment(String department) {
+        this.department = department;
+    }
+}

persistence-modules/hibernate-queries/src/main/java/com/baeldung/hibernate/listentity/service/EmployeeService.java

@@ -0,0 +1,88 @@
+package com.baeldung.hibernate.listentity.service;
+
+import java.util.Collections;
+import java.util.List;
+
+import jakarta.persistence.*;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import jakarta.persistence.criteria.CriteriaQuery;
+import jakarta.persistence.criteria.Path;
+import jakarta.persistence.criteria.Predicate;
+import jakarta.persistence.criteria.Root;
+
+import org.springframework.stereotype.Service;
+
+import com.baeldung.hibernate.listentity.entity.Department;
+import com.baeldung.hibernate.listentity.entity.Employee;
+
+@Service
+public class EmployeeService {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    public List<Employee> getAllEmployeesUsingJPQL() {
+        String jpqlQuery = "SELECT e FROM Employee e";
+        Query query = entityManager.createQuery(jpqlQuery, Employee.class);
+        return query.getResultList();
+    }
+
+    public List<Employee> getAllEmployeesByDepartmentUsingJPQL() {
+        String jpqlQuery = "SELECT e FROM Employee e WHERE e.department = 'Engineering' ORDER BY e.lastName ASC";
+        Query query = entityManager.createQuery(jpqlQuery, Employee.class);
+
+        return query.getResultList();
+    }
+
+    public List<Employee> getAllEmployeesUsingNamedQuery() {
+        Query query = entityManager.createNamedQuery("findAllEmployees", Employee.class);
+
+        return query.getResultList();
+    }
+
+    public List<Employee> getAllEmployeesByDepartmentUsingNamedQuery(String department) {
+        Query query = entityManager.createNamedQuery("findEmployeesByDepartment", Employee.class);
+        query.setParameter("department", department);
+
+        return query.getResultList();
+    }
+
+    public List<Employee> getAllEmployeesUsingCriteriaAPI() {
+        CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
+        CriteriaQuery<Employee> criteriaQuery = criteriaBuilder.createQuery(Employee.class);
+        Root<Employee> employeeRoot = criteriaQuery.from(Employee.class);
+
+        criteriaQuery.select(employeeRoot);
+        Query query = entityManager.createQuery(criteriaQuery);
+
+        return query.getResultList();
+    }
+
+    public List<Employee> getAllEmployeesByDepartmentUsingCriteriaAPI(String department) {
+        CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
+        CriteriaQuery<Employee> criteriaQuery = criteriaBuilder.createQuery(Employee.class);
+        Root<Employee> employeeRoot = criteriaQuery.from(Employee.class);
+        Predicate departmentPredicate = criteriaBuilder.equal(employeeRoot.get("department"), department);
+        Path<Object> sortByPath = employeeRoot.get("lastName");
+        criteriaQuery.orderBy(criteriaBuilder.asc(sortByPath));
+        criteriaQuery.select(employeeRoot)
+            .where(departmentPredicate);
+        Query query = entityManager.createQuery(criteriaQuery);
+
+        return query.getResultList();
+    }
+
+    public List<Employee> getAllEmployeesByDepartmentUsingOneToManyAnnotations(String departmentName) {
+        try {
+            // Retrieve the department by its name
+            Department department = entityManager.createQuery("SELECT d FROM Department d WHERE d.name = :name", Department.class)
+                .setParameter("name", departmentName)
+                .getSingleResult();
+
+            // Return the list of employees associated with the department
+            return department.getEmployees();
+        } catch (NoResultException e) {
+            return Collections.emptyList();
+        }
+    }
+}