[JAVA-2306] Fixes after Loredana's review

* Brought back UserRepositoryCustomImpl.java

* Added link to https://www.baeldung.com/spring-data-jpa-query in spring-data-jpa-query-2 README

* Migrated code for https://www.baeldung.com/spring-data-jpa-query-by-date

* Migrated https://www.baeldung.com/spring-vs-jta-transactional to spring-persistence-simple

persistence-modules/spring-data-jpa-query-2/README.md

@@ -3,6 +3,7 @@
 This module contains articles about querying data using Spring Data JPA 
 
 ### Relevant Articles: 
+- [Spring Data JPA @Query Annotation](https://www.baeldung.com/spring-data-jpa-query)
 - [Use Criteria Queries in a Spring Data Application](https://www.baeldung.com/spring-data-criteria-queries)
 - [Query Entities by Dates and Times with Spring Data JPA](https://www.baeldung.com/spring-data-jpa-query-by-date)
 - More articles: [[<-- prev]](../spring-data-jpa-query)

persistence-modules/spring-data-jpa-query-2/src/main/java/com/baeldung/spring/data/jpa/query/UserRepositoryCustomImpl.java

@@ -0,0 +1,48 @@
+package com.baeldung.spring.data.jpa.query;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.criteria.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class UserRepositoryCustomImpl implements UserRepositoryCustom {
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    @Override
+    public List<User> findUserByEmails(Set<String> emails) {
+        CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+        CriteriaQuery<User> query = cb.createQuery(User.class);
+        Root<User> user = query.from(User.class);
+
+        Path<String> emailPath = user.get("email");
+
+        List<Predicate> predicates = new ArrayList<>();
+        for (String email : emails) {
+
+            predicates.add(cb.like(emailPath, email));
+
+        }
+        query.select(user)
+            .where(cb.or(predicates.toArray(new Predicate[predicates.size()])));
+
+        return entityManager.createQuery(query)
+            .getResultList();
+    }
+    
+    @Override
+    public List<User> findAllUsersByPredicates(Collection<java.util.function.Predicate<User>> predicates) {
+        List<User> allUsers = entityManager.createQuery("select u from User u", User.class).getResultList();
+        Stream<User> allUsersStream = allUsers.stream();
+        for (java.util.function.Predicate<User> predicate : predicates) {
+            allUsersStream = allUsersStream.filter(predicate);
+        }
+
+        return allUsersStream.collect(Collectors.toList());
+    }
+}

persistence-modules/spring-data-jpa-query-2/src/main/java/com/baeldung/spring/data/jpa/query/datetime/Application.java

@@ -0,0 +1,13 @@
+package com.baeldung.spring.data.jpa.query.datetime;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}

persistence-modules/spring-data-jpa-query-2/src/main/java/com/baeldung/spring/data/jpa/query/datetime/Article.java

@@ -0,0 +1,23 @@
+package com.baeldung.spring.data.jpa.query.datetime;
+
+import javax.persistence.*;
+import java.util.Date;
+
+@Entity
+public class Article {
+
+    @Id
+    @GeneratedValue
+    private Integer id;
+    @Temporal(TemporalType.DATE)
+    private Date publicationDate;
+    @Temporal(TemporalType.TIME)
+    private Date publicationTime;
+    @Temporal(TemporalType.TIMESTAMP)
+    private Date creationDateTime;
+
+    public Integer getId() {
+        return id;
+    }
+
+}

persistence-modules/spring-data-jpa-query-2/src/main/java/com/baeldung/spring/data/jpa/query/datetime/ArticleRepository.java

@@ -0,0 +1,21 @@
+package com.baeldung.spring.data.jpa.query.datetime;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.Date;
+import java.util.List;
+
+public interface ArticleRepository extends JpaRepository<Article, Integer> {
+
+    List<Article> findAllByPublicationDate(Date publicationDate);
+
+    List<Article> findAllByPublicationTimeBetween(Date publicationTimeStart,
+                                                  Date publicationTimeEnd);
+
+    @Query("select a from Article a where a.creationDateTime <= :creationDateTime")
+    List<Article> findAllWithCreationDateTimeBefore(
+      @Param("creationDateTime") Date creationDateTime);
+
+}

persistence-modules/spring-data-jpa-query-2/src/main/resources/import_entities.sql

@@ -0,0 +1,3 @@
+insert into Article(id, publication_date, publication_time, creation_date_time) values(1, TO_DATE('01/01/2018', 'DD/MM/YYYY'), TO_DATE('15:00', 'HH24:MI'), TO_DATE('31/12/2017 07:30', 'DD/MM/YYYY HH24:MI'));
+insert into Article(id, publication_date, publication_time, creation_date_time) values(2, TO_DATE('01/01/2018', 'DD/MM/YYYY'), TO_DATE('15:30', 'HH24:MI'), TO_DATE('15/12/2017 08:00', 'DD/MM/YYYY HH24:MI'));
+insert into Article(id, publication_date, publication_time, creation_date_time) values(3, TO_DATE('15/12/2017', 'DD/MM/YYYY'), TO_DATE('16:00', 'HH24:MI'), TO_DATE('01/12/2017 13:45', 'DD/MM/YYYY HH24:MI'));

persistence-modules/spring-data-jpa-query-2/src/test/java/com/baeldung/spring/data/jpa/query/datetime/ArticleRepositoryIntegrationTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.spring.data.jpa.query.datetime;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.text.SimpleDateFormat;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+@RunWith(SpringRunner.class)
+@DataJpaTest(properties="spring.datasource.data=classpath:import_entities.sql")
+public class ArticleRepositoryIntegrationTest {
+
+    @Autowired
+    private ArticleRepository repository;
+
+    @Test
+    public void givenImportedArticlesWhenFindAllByPublicationDateThenArticles1And2Returned()
+      throws Exception {
+        List<Article> result = repository.findAllByPublicationDate(
+          new SimpleDateFormat("yyyy-MM-dd").parse("2018-01-01")
+        );
+
+        assertEquals(2, result.size());
+        assertTrue(result.stream()
+          .map(Article::getId)
+          .allMatch(id -> Arrays.asList(1, 2).contains(id))
+        );
+    }
+
+    @Test
+    public void givenImportedArticlesWhenFindAllByPublicationTimeBetweenThenArticles2And3Returned()
+      throws Exception {
+        List<Article> result = repository.findAllByPublicationTimeBetween(
+          new SimpleDateFormat("HH:mm").parse("15:15"),
+          new SimpleDateFormat("HH:mm").parse("16:30")
+        );
+
+        assertEquals(2, result.size());
+        assertTrue(result.stream()
+          .map(Article::getId)
+          .allMatch(id -> Arrays.asList(2, 3).contains(id))
+        );
+    }
+
+    @Test
+    public void givenImportedArticlesWhenFindAllWithCreationDateTimeBeforeThenArticles2And3Returned() throws Exception {
+        List<Article> result = repository.findAllWithCreationDateTimeBefore(
+          new SimpleDateFormat("yyyy-MM-dd HH:mm").parse("2017-12-15 10:00")
+        );
+
+        assertEquals(2, result.size());
+        assertTrue(result.stream()
+          .map(Article::getId)
+          .allMatch(id -> Arrays.asList(2, 3).contains(id))
+        );
+    }
+
+}