BAEL-2227 JPA Criteria Queries In Clause (#5606)
* BAEL-2159: Mini Article on "Separate double into integer and decimal parts" * BEAL-2227: JPA Criteria Query In clause - Tutorial. * Minor Fix: Changed type of Predicate. * BAEL-2227: Code Review Comments: Extracted criteriaBuilder to a field. Refactored a private method to create criteria query. * BAEL-2227: Fixed spelling mistakes in the code.
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@ -22,6 +22,14 @@ public class DeptEmployee {
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this.employeeNumber = employeeNumber;
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this.department = department;
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}
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public DeptEmployee(String name, String employeeNumber, String designation, Department department) {
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super();
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this.name = name;
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this.employeeNumber = employeeNumber;
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this.designation = designation;
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this.department = department;
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}
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public long getId() {
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return id;
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@ -0,0 +1,15 @@
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package com.baeldung.hibernate.jpacriteriabuilder.service;
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import java.util.List;
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import com.baeldung.hibernate.entities.DeptEmployee;
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public interface EmployeeSearchService {
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List<DeptEmployee> filterbyDesignationUsingCriteriaBuilder(List<String> designaitons);
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List<DeptEmployee> filterbyDesignationUsingExpression(List<String> aurhors);
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List<DeptEmployee> searchByDepartmentQuery(String query);
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}
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@ -0,0 +1,77 @@
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package com.baeldung.hibernate.jpacriteriabuilder.service;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.TypedQuery;
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import javax.persistence.criteria.CriteriaBuilder;
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import javax.persistence.criteria.CriteriaBuilder.In;
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import javax.persistence.criteria.CriteriaQuery;
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import javax.persistence.criteria.Root;
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import javax.persistence.criteria.Subquery;
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import com.baeldung.hibernate.entities.Department;
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import com.baeldung.hibernate.entities.DeptEmployee;
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public class EmployeeSearchServiceImpl implements EmployeeSearchService {
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private EntityManager entityManager;
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private CriteriaBuilder criteriaBuilder;
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public EmployeeSearchServiceImpl(EntityManager entityManager) {
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this.entityManager = entityManager;
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this.criteriaBuilder = entityManager.getCriteriaBuilder();
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}
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@Override
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public List<DeptEmployee> filterbyDesignationUsingCriteriaBuilder(List<String> designations) {
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CriteriaQuery<DeptEmployee> criteriaQuery = createCriteriaQuery(DeptEmployee.class);
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Root<DeptEmployee> root = criteriaQuery.from(DeptEmployee.class);
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In<String> inClause = criteriaBuilder.in(root.get("designation"));
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for (String designaiton : designations) {
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inClause.value(designaiton);
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}
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criteriaQuery.select(root)
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.where(inClause);
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TypedQuery<DeptEmployee> query = entityManager.createQuery(criteriaQuery);
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return query.getResultList();
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}
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@Override
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public List<DeptEmployee> filterbyDesignationUsingExpression(List<String> designations) {
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CriteriaQuery<DeptEmployee> criteriaQuery = createCriteriaQuery(DeptEmployee.class);
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Root<DeptEmployee> root = criteriaQuery.from(DeptEmployee.class);
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criteriaQuery.select(root)
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.where(root.get("designation")
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.in(designations));
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TypedQuery<DeptEmployee> query = entityManager.createQuery(criteriaQuery);
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return query.getResultList();
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}
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@Override
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public List<DeptEmployee> searchByDepartmentQuery(String searchKey) {
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CriteriaQuery<DeptEmployee> criteriaQuery = createCriteriaQuery(DeptEmployee.class);
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Root<DeptEmployee> emp = criteriaQuery.from(DeptEmployee.class);
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Subquery<Department> subquery = criteriaQuery.subquery(Department.class);
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Root<Department> dept = subquery.from(Department.class);
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subquery.select(dept)
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.distinct(true)
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.where(criteriaBuilder.like(dept.get("name"), new StringBuffer("%").append(searchKey)
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.append("%")
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.toString()));
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criteriaQuery.select(emp)
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.where(criteriaBuilder.in(emp.get("department"))
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.value(subquery));
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TypedQuery<DeptEmployee> query = entityManager.createQuery(criteriaQuery);
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return query.getResultList();
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}
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private <T> CriteriaQuery<T> createCriteriaQuery(Class<T> klass) {
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return criteriaBuilder.createQuery(klass);
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}
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}
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@ -0,0 +1,122 @@
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package com.baeldung.hibernate.jpacriteriabuilder;
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import static org.hamcrest.MatcherAssert.assertThat;
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import static org.hamcrest.collection.IsIterableContainingInAnyOrder.containsInAnyOrder;
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import static org.junit.Assert.assertEquals;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.stream.Collectors;
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import javax.persistence.EntityManager;
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import org.hibernate.HibernateException;
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import org.hibernate.Session;
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import org.junit.After;
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import org.junit.Before;
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import org.junit.Test;
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import com.baeldung.hibernate.HibernateUtil;
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import com.baeldung.hibernate.entities.Department;
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import com.baeldung.hibernate.entities.DeptEmployee;
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import com.baeldung.hibernate.jpacriteriabuilder.service.EmployeeSearchService;
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import com.baeldung.hibernate.jpacriteriabuilder.service.EmployeeSearchServiceImpl;
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public class EmployeeSearchServiceIntegrationTest {
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private EntityManager entityManager;
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private EmployeeSearchService searchService;
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private Session session;
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@Before
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public final void setup() throws HibernateException, IOException {
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session = HibernateUtil.getSessionFactory()
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.openSession();
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entityManager = session.getEntityManagerFactory()
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.createEntityManager();
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searchService = new EmployeeSearchServiceImpl(entityManager);
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entityManager.getTransaction()
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.begin();
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Department department = new Department("Pre Sales");
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DeptEmployee employee = new DeptEmployee("John Smith", "001", "Manager", department);
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entityManager.persist(department);
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entityManager.persist(employee);
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employee = new DeptEmployee("Ian Evans", "002", "Associate", department);
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entityManager.persist(department);
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entityManager.persist(employee);
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department = new Department("Copporate Sales");
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employee = new DeptEmployee("Robert Carter", "003", "Manager", department);
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entityManager.persist(department);
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entityManager.persist(employee);
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employee = new DeptEmployee("John Carter", "004", "Senior Manager", department);
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entityManager.persist(employee);
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employee = new DeptEmployee("David Guetta", "009", "Associate", department);
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entityManager.persist(department);
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entityManager.persist(employee);
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department = new Department("Post Sales");
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employee = new DeptEmployee("Robert Jonas", "005", "Director", department);
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entityManager.persist(department);
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entityManager.persist(employee);
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employee = new DeptEmployee("John Ferros", "006", "Junior Associate", department);
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entityManager.persist(department);
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entityManager.persist(employee);
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department = new Department("Client Support");
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employee = new DeptEmployee("Robert Mcclements", "007", "Director", department);
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entityManager.persist(department);
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entityManager.persist(employee);
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employee = new DeptEmployee("Peter Parker", "008", "Manager", department);
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entityManager.persist(department);
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entityManager.persist(employee);
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}
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@After
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public final void teardown() {
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entityManager.getTransaction()
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.rollback();
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entityManager.close();
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}
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@Test
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public final void givenCriteriaQuery_whenSearchedUsingCriteriaBuilderWithListofAuthors_thenResultIsFilteredByAuthorNames() {
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List<String> designations = new ArrayList<String>() {
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{
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add("Manager");
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add("Senior Manager");
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add("Director");
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}
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};
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List<DeptEmployee> result = searchService.filterbyDesignationUsingCriteriaBuilder(designations);
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assertEquals("Number of Employees does not match with expected.", 6, result.size());
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assertThat(result.stream()
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.map(DeptEmployee::getDesignation)
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.distinct()
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.collect(Collectors.toList()), containsInAnyOrder(designations.toArray()));
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}
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@Test
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public final void givenCriteriaQuery_whenSearchedUsingExpressionWithListofAuthors_thenResultIsFilteredByAuthorNames() {
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List<String> designations = new ArrayList<String>() {
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{
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add("Manager");
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add("Senior Manager");
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add("Director");
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}
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};
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List<DeptEmployee> result = searchService.filterbyDesignationUsingExpression(designations);
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assertEquals("Number of Employees does not match with expected.", 6, result.size());
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assertThat(result.stream()
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.map(DeptEmployee::getDesignation)
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.distinct()
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.collect(Collectors.toList()), containsInAnyOrder(designations.toArray()));
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}
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@Test
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public final void givenCriteriaQuery_whenSearchedDepartmentLike_thenResultIsFilteredByDepartment() {
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List<DeptEmployee> result = searchService.searchByDepartmentQuery("Sales");
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assertEquals("Number of Employees does not match with expected.", 7, result.size());
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// assertThat(result.stream().map(DeptEmployee::getDesignation).distinct().collect(Collectors.toList()), containsInAnyOrder(designations.toArray()));
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}
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}
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