Merge pull request #8125 from eugenp/revert-8119-BAEL-3275-2

Revert "BAEL-3275: Using blocking queue for pub-sub"

persistence-modules/querydsl/src/main/java/org/baeldung/dao/PersonDao.java

@@ -0,0 +1,22 @@
+package org.baeldung.dao;
+
+import java.util.List;
+import java.util.Map;
+
+import org.baeldung.entity.Person;
+
+public interface PersonDao {
+
+    public Person save(Person person);
+
+    public List<Person> findPersonsByFirstnameQueryDSL(String firstname);
+
+    public List<Person> findPersonsByFirstnameAndSurnameQueryDSL(String firstname, String surname);
+
+    public List<Person> findPersonsByFirstnameInDescendingOrderQueryDSL(String firstname);
+
+    public int findMaxAge();
+
+    public Map<String, Integer> findMaxAgeByName();
+
+}

persistence-modules/querydsl/src/main/java/org/baeldung/dao/PersonDaoImpl.java

@@ -0,0 +1,68 @@
+package org.baeldung.dao;
+
+import java.util.List;
+import java.util.Map;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+
+import org.baeldung.entity.Person;
+import org.baeldung.entity.QPerson;
+import org.springframework.stereotype.Repository;
+
+import com.querydsl.core.group.GroupBy;
+import com.querydsl.jpa.impl.JPAQuery;
+
+@Repository
+public class PersonDaoImpl implements PersonDao {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    @Override
+    public Person save(final Person person) {
+        em.persist(person);
+        return person;
+    }
+
+    @Override
+    public List<Person> findPersonsByFirstnameQueryDSL(final String firstname) {
+        final JPAQuery<Person> query = new JPAQuery<>(em);
+        final QPerson person = QPerson.person;
+
+        return query.from(person).where(person.firstname.eq(firstname)).fetch();
+    }
+
+    @Override
+    public List<Person> findPersonsByFirstnameAndSurnameQueryDSL(final String firstname, final String surname) {
+        final JPAQuery<Person> query = new JPAQuery<>(em);
+        final QPerson person = QPerson.person;
+
+        return query.from(person).where(person.firstname.eq(firstname).and(person.surname.eq(surname))).fetch();
+    }
+
+    @Override
+    public List<Person> findPersonsByFirstnameInDescendingOrderQueryDSL(final String firstname) {
+        final JPAQuery<Person> query = new JPAQuery<>(em);
+        final QPerson person = QPerson.person;
+
+        return query.from(person).where(person.firstname.eq(firstname)).orderBy(person.surname.desc()).fetch();
+    }
+
+    @Override
+    public int findMaxAge() {
+        final JPAQuery<Person> query = new JPAQuery<>(em);
+        final QPerson person = QPerson.person;
+
+        return query.from(person).select(person.age.max()).fetchFirst();
+    }
+
+    @Override
+    public Map<String, Integer> findMaxAgeByName() {
+        final JPAQuery<Person> query = new JPAQuery<>(em);
+        final QPerson person = QPerson.person;
+
+        return query.from(person).transform(GroupBy.groupBy(person.firstname).as(GroupBy.max(person.age)));
+    }
+
+}

persistence-modules/querydsl/src/main/java/org/baeldung/entity/Person.java

@@ -0,0 +1,69 @@
+package org.baeldung.entity;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Person {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column
+    private String firstname;
+
+    @Column
+    private String surname;
+
+    @Column
+    private int age;
+
+    Person() {
+    }
+
+    public Person(final String firstname, final String surname) {
+        this.firstname = firstname;
+        this.surname = surname;
+    }
+
+    public Person(final String firstname, final String surname, final int age) {
+        this(firstname, surname);
+        this.age = age;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(final Long id) {
+        this.id = id;
+    }
+
+    public String getFirstname() {
+        return firstname;
+    }
+
+    public void setFirstname(final String firstname) {
+        this.firstname = firstname;
+    }
+
+    public String getSurname() {
+        return surname;
+    }
+
+    public void setSurname(final String surname) {
+        this.surname = surname;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(final int age) {
+        this.age = age;
+    }
+}

persistence-modules/querydsl/src/main/java/org/baeldung/querydsl/intro/entities/BlogPost.java

@@ -0,0 +1,56 @@
+/*
+ * (c) Центр ИТ, 2016. Все права защищены.
+ */
+package org.baeldung.querydsl.intro.entities;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+
+@Entity
+public class BlogPost {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    private String title;
+
+    private String body;
+
+    @ManyToOne
+    private User user;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String code) {
+        this.title = code;
+    }
+
+    public String getBody() {
+        return body;
+    }
+
+    public void setBody(String body) {
+        this.body = body;
+    }
+
+    public User getUser() {
+        return user;
+    }
+
+    public void setUser(User user) {
+        this.user = user;
+    }
+}

persistence-modules/querydsl/src/main/java/org/baeldung/querydsl/intro/entities/User.java

@@ -0,0 +1,55 @@
+/*
+ * (c) Центр ИТ, 2016. Все права защищены.
+ */
+package org.baeldung.querydsl.intro.entities;
+
+import java.util.HashSet;
+import java.util.Set;
+import javax.persistence.*;
+
+@Entity
+public class User {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    private String login;
+
+    private Boolean disabled;
+
+    @OneToMany(cascade = CascadeType.PERSIST, mappedBy = "user")
+    private Set<BlogPost> blogPosts = new HashSet<>(0);
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getLogin() {
+        return login;
+    }
+
+    public void setLogin(String name) {
+        this.login = name;
+    }
+
+    public Set<BlogPost> getBlogPosts() {
+        return blogPosts;
+    }
+
+    public void setBlogPosts(Set<BlogPost> blogPosts) {
+        this.blogPosts = blogPosts;
+    }
+
+    public Boolean getDisabled() {
+        return disabled;
+    }
+
+    public void setDisabled(Boolean disabled) {
+        this.disabled = disabled;
+    }
+}