Samples for the Intro to QueryDSL article, merged with existing querydsl module. Updated module dependencies. (#476)

querydsl/src/main/java/org/baeldung/dao/PersonDaoImpl.java

@@ -10,8 +10,8 @@ import org.baeldung.entity.Person;
 import org.baeldung.entity.QPerson;
 import org.springframework.stereotype.Repository;
 
-import com.mysema.query.group.GroupBy;
-import com.mysema.query.jpa.impl.JPAQuery;
+import com.querydsl.core.group.GroupBy;
+import com.querydsl.jpa.impl.JPAQuery;
 
 @Repository
 public class PersonDaoImpl implements PersonDao {
@@ -27,39 +27,39 @@ public class PersonDaoImpl implements PersonDao {
 
     @Override
     public List<Person> findPersonsByFirstnameQueryDSL(final String firstname) {
-        final JPAQuery query = new JPAQuery(em);
+        final JPAQuery<Person> query = new JPAQuery<>(em);
         final QPerson person = QPerson.person;
 
-        return query.from(person).where(person.firstname.eq(firstname)).list(person);
+        return query.from(person).where(person.firstname.eq(firstname)).fetch();
     }
 
     @Override
     public List<Person> findPersonsByFirstnameAndSurnameQueryDSL(final String firstname, final String surname) {
-        final JPAQuery query = new JPAQuery(em);
+        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))).list(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 query = new JPAQuery(em);
+        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()).list(person);
+        return query.from(person).where(person.firstname.eq(firstname)).orderBy(person.surname.desc()).fetch();
     }
 
     @Override
     public int findMaxAge() {
-        final JPAQuery query = new JPAQuery(em);
+        final JPAQuery<Person> query = new JPAQuery<>(em);
         final QPerson person = QPerson.person;
 
-        return query.from(person).list(person.age.max()).get(0);
+        return query.from(person).select(person.age.max()).fetchFirst();
     }
 
     @Override
     public Map<String, Integer> findMaxAgeByName() {
-        final JPAQuery query = new JPAQuery(em);
+        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)));

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;
+    }
+}

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;
+    }
+}

querydsl/src/main/resources/META-INF/persistence.xml

@@ -16,4 +16,17 @@
         </properties>
     </persistence-unit>
 
+    <!-- PersistenceUnit for Intro to QueryDSL -->
+    <persistence-unit name="org.baeldung.querydsl.intro">
+        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
+        <properties>
+            <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
+            <property name="hibernate.connection.url" value="jdbc:hsqldb:mem:test"/>
+            <property name="hibernate.connection.username" value="sa"/>
+            <property name="hibernate.connection.password" value=""/>
+            <property name="hibernate.hbm2ddl.auto" value="update"/>
+            <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect" />
+        </properties>
+    </persistence-unit>
+
 </persistence>

querydsl/src/main/resources/logback.xml

@@ -1,12 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" >
-<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
+<configuration>
 
-    <!-- Appenders -->
-    <appender name="console" class="org.apache.log4j.ConsoleAppender">
-        <param name="Target" value="System.out" />
-        <layout class="org.apache.log4j.PatternLayout">
-            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} [%t] %-5p: %c - %m%n" />
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <layout class="ch.qos.logback.classic.PatternLayout">
+            <Pattern>%d{yyyy-MM-dd HH:mm:ss} [%t] %-5p: %c - %m%n</Pattern>
         </layout>
     </appender>
 
@@ -33,10 +30,8 @@
         <level value="warn" />
     </logger>
 
-    <!-- Root Logger -->
-    <root>
-        <priority value="warn" />
-        <appender-ref ref="console" />
+    <root level="warn">
+        <appender-ref ref="STDOUT"/>
     </root>
 
-</log4j:configuration>
+</configuration>