Following example shows how to use JPQL IN keyword to apply a set of values in WHERE clause.

Example

Entity

@Entity
public class Employee {
    @Id
    @GeneratedValue
    private long id;
    private String name;
    private String dept;
    private long salary;
    .............
}

Using IN expression

public class ExampleMain {
    private static EntityManagerFactory entityManagerFactory =
            Persistence.createEntityManagerFactory("example-unit");

    public static void main(String[] args) {
        try {
            persistEmployees();
            findEmployeeBySalary();
            findEmployeeByName();
            //using list parameter
            findEmployeeByDept();
            //not in statement
            findEmployeeByDept2();
        } finally {
            entityManagerFactory.close();
        }
    }

    public static void persistEmployees() {
        Employee employee1 = Employee.create("Diana", "IT", 3000);
        Employee employee2 = Employee.create("Rose", "Sales", 2000);
        Employee employee3 = Employee.create("Denise", "Admin", 4000);
        Employee employee4 = Employee.create("Mike", "HR", 3500);
        EntityManager em = entityManagerFactory.createEntityManager();
        em.getTransaction().begin();
        em.persist(employee1);
        em.persist(employee2);
        em.persist(employee3);
        em.persist(employee4);
        em.getTransaction().commit();
        em.close();
    }

    private static void findEmployeeBySalary() {
        System.out.println("-- Employees with salary IN 2000, 3000 and 4000 --");
        EntityManager em = entityManagerFactory.createEntityManager();
        Query query = em.createQuery(
                "SELECT e FROM Employee e WHERE e.salary IN (2000L, 3000, 4000L) order by e.salary");
        List<Employee> resultList = query.getResultList();
        resultList.forEach(System.out::println);
        em.close();
    }

    private static void findEmployeeByName() {
        System.out.println("-- Employees name IN Diana, Mike and Rose --");
        EntityManager em = entityManagerFactory.createEntityManager();
        Query query = em.createQuery(
                "SELECT e FROM Employee e WHERE e.name IN ('Diana', 'Mike', 'Rose')");
        List<Employee> resultList = query.getResultList();
        resultList.forEach(System.out::println);
        em.close();
    }

    private static void findEmployeeByDept() {
        System.out.println("-- Employees name IN IT, Sales and HR --");
        EntityManager em = entityManagerFactory.createEntityManager();
        Query query = em.createQuery(
                "SELECT e FROM Employee e WHERE e.dept IN :deptNames");
        query.setParameter("deptNames", Arrays.asList("IT", "Sales", "HR"));
        List<Employee> resultList = query.getResultList();
        resultList.forEach(System.out::println);
        em.close();
    }

    private static void findEmployeeByDept2() {
        System.out.println("-- Employees name NOT IN IT, Sales and HR --");
        EntityManager em = entityManagerFactory.createEntityManager();
        Query query = em.createQuery(
                "SELECT e FROM Employee e WHERE e.dept NOT IN :deptNames");
        query.setParameter("deptNames", Arrays.asList("IT", "Sales", "HR"));
        List<Employee> resultList = query.getResultList();
        resultList.forEach(System.out::println);
        em.close();
    }
}

-- Employees with salary IN 2000, 3000 and 4000 --
Employee{id=2, name='Rose', dept='Sales', salary=2000}
Employee{id=1, name='Diana', dept='IT', salary=3000}
Employee{id=3, name='Denise', dept='Admin', salary=4000}
-- Employees name IN Diana, Mike and Rose --
Employee{id=1, name='Diana', dept='IT', salary=3000}
Employee{id=2, name='Rose', dept='Sales', salary=2000}
Employee{id=4, name='Mike', dept='HR', salary=3500}
-- Employees name IN IT, Sales and HR --
Employee{id=1, name='Diana', dept='IT', salary=3000}
Employee{id=2, name='Rose', dept='Sales', salary=2000}
Employee{id=4, name='Mike', dept='HR', salary=3500}
-- Employees name NOT IN IT, Sales and HR --
Employee{id=3, name='Denise', dept='Admin', salary=4000}

Example Project

Dependencies and Technologies Used:

• h2 1.4.197: H2 Database Engine.
• hibernate-core 5.2.13.Final: The core O/RM functionality as provided by Hibernate.
  Implements javax.persistence:javax.persistence-api version 2.1
• JDK 1.8
• Maven 3.3.9