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davidmartinezbaruadavidmartinezbarua
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Merge pull request #16094 from sIvanovKonstantyn/master
BAEL-6163 - Examples for the article "Querydsl vs. JPA Criteria"
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‎persistence-modules/querydsl/pom.xml

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</parent>
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<dependencies>
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<!-- Spring Data -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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<version>${spring-boot.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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<version>${spring-boot.version}</version>
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</dependency>
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<!-- QueryDSL -->
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<dependency>
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<groupId>com.querydsl</groupId>
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<version>${hibernate-core.version}</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.hibernate</groupId>
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<artifactId>hibernate-jpamodelgen</artifactId>
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<version>${hibernate-core.version}</version>
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</dependency>
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<dependency>
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<groupId>org.bsc.maven</groupId>
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<artifactId>maven-processor-plugin</artifactId>
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<version>5.0</version>
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</dependency>
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<dependency>
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<groupId>commons-dbcp</groupId>
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<artifactId>commons-dbcp</artifactId>
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<version>${maven-compiler-plugin.version}</version>
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<configuration>
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<compilerArgument>-proc:none</compilerArgument>
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<source>17</source>
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<target>17</target>
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</configuration>
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</plugin>
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<!-- QueryDSL plugin -->
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<plugin>
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<groupId>com.mysema.maven</groupId>
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<artifactId>apt-maven-plugin</artifactId>
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<version>${apt-maven-plugin.version}</version>
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<groupId>org.bsc.maven</groupId>
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<artifactId>maven-processor-plugin</artifactId>
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<version>5.0</version>
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<executions>
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<execution>
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<id>process</id>
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<goals>
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<goal>process</goal>
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</goals>
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<phase>generate-sources</phase>
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<configuration>
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<outputDirectory>target/generated-sources/java</outputDirectory>
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<processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
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<processors>
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<processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
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<processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
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</processors>
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</configuration>
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</execution>
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</executions>
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<dependencies>
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<dependency>
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<groupId>org.hibernate</groupId>
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<artifactId>hibernate-jpamodelgen</artifactId>
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<version>${hibernate-core.version}</version>
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</dependency>
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</dependencies>
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</plugin>
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</plugins>
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</build>
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<commons-dbcp.version>1.4</commons-dbcp.version>
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<apt-maven-plugin.version>1.1.3</apt-maven-plugin.version>
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<hibernate-core.version>6.4.2.Final</hibernate-core.version>
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<spring-boot.version>3.2.3</spring-boot.version>
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</properties>
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</project>

‎persistence-modules/querydsl/src/main/java/com/baeldung/querydslvsjpacriteria/entities/GroupUser.java

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package com.baeldung.querydslvsjpacriteria.entities;
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import java.util.HashSet;
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import java.util.Set;
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import jakarta.persistence.CascadeType;
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import jakarta.persistence.Entity;
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import jakarta.persistence.GeneratedValue;
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import jakarta.persistence.Id;
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import jakarta.persistence.ManyToMany;
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import jakarta.persistence.OneToMany;
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@Entity
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public class GroupUser {
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@Id
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@GeneratedValue
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private Long id;
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private String login;
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@ManyToMany(mappedBy = "groupUsers", cascade = CascadeType.PERSIST)
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private Set<UserGroup> userGroups = new HashSet<>();
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@OneToMany(cascade = CascadeType.PERSIST, mappedBy = "groupUser")
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private Set<Task> tasks = new HashSet<>(0);
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getLogin() {
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return login;
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}
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public void setLogin(String login) {
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this.login = login;
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}
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public Set<UserGroup> getUserGroups() {
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return userGroups;
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}
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public void setUserGroups(Set<UserGroup> userGroups) {
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this.userGroups = userGroups;
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}
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public Set<Task> getTasks() {
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return tasks;
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}
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public void setTasks(Set<Task> tasks) {
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this.tasks = tasks;
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}
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}

‎persistence-modules/querydsl/src/main/java/com/baeldung/querydslvsjpacriteria/entities/Task.java

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package com.baeldung.querydslvsjpacriteria.entities;
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import jakarta.persistence.Entity;
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import jakarta.persistence.GeneratedValue;
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import jakarta.persistence.Id;
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import jakarta.persistence.ManyToOne;
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@Entity
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public class Task {
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@Id
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@GeneratedValue
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private Long id;
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private String description;
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@ManyToOne
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private GroupUser groupUser;
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getDescription() {
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return description;
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}
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public void setDescription(String description) {
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this.description = description;
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}
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public GroupUser getUser() {
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return groupUser;
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}
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public void setUser(GroupUser groupUser) {
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this.groupUser = groupUser;
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}
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}

‎persistence-modules/querydsl/src/main/java/com/baeldung/querydslvsjpacriteria/entities/UserGroup.java

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package com.baeldung.querydslvsjpacriteria.entities;
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import java.util.HashSet;
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import java.util.Set;
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import jakarta.persistence.CascadeType;
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import jakarta.persistence.Entity;
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import jakarta.persistence.GeneratedValue;
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import jakarta.persistence.Id;
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import jakarta.persistence.ManyToMany;
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@Entity
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public class UserGroup {
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@Id
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@GeneratedValue
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private Long id;
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private String name;
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@ManyToMany(cascade = CascadeType.PERSIST)
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private Set<GroupUser> groupUsers = new HashSet<>();
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Set<GroupUser> getGroupUsers() {
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return groupUsers;
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}
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public void setGroupUsers(Set<GroupUser> groupUsers) {
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this.groupUsers = groupUsers;
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}
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}

‎persistence-modules/querydsl/src/main/java/com/baeldung/querydslvsjpacriteria/repositories/UserGroupJpaSpecificationRepository.java

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package com.baeldung.querydslvsjpacriteria.repositories;
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import java.util.List;
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import org.springframework.data.jpa.domain.Specification;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
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import com.baeldung.querydslvsjpacriteria.entities.UserGroup;
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import com.baeldung.querydslvsjpacriteria.entities.UserGroup_;
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public interface UserGroupJpaSpecificationRepository extends JpaRepository<UserGroup, Long>,
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JpaSpecificationExecutor<UserGroup> {
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default List<UserGroup> findAllWithNameInAnyList(List<String> names1, List<String> names2) {
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return findAll(specNameInAnyList(names1, names2));
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}
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default Specification<UserGroup> specNameInAnyList(List<String> names1, List<String> names2) {
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return (root, q, cb) -> cb.or(
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root.get(UserGroup_.name).in(names1),
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root.get(UserGroup_.name).in(names2)
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);
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}
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}

‎persistence-modules/querydsl/src/main/java/com/baeldung/querydslvsjpacriteria/repositories/UserGroupQuerydslPredicateRepository.java

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package com.baeldung.querydslvsjpacriteria.repositories;
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import java.util.List;
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import java.util.stream.Collectors;
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import java.util.stream.StreamSupport;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.data.querydsl.QuerydslPredicateExecutor;
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import com.baeldung.querydslvsjpacriteria.entities.QUserGroup;
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import com.baeldung.querydslvsjpacriteria.entities.UserGroup;
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import com.querydsl.core.BooleanBuilder;
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import com.querydsl.core.types.Predicate;
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public interface UserGroupQuerydslPredicateRepository extends JpaRepository<UserGroup, Long>, QuerydslPredicateExecutor<UserGroup> {
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default List<UserGroup> findAllWithNameInAnyList(List<String> names1, List<String> names2) {
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return StreamSupport
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.stream(findAll(predicateInAnyList(names1, names2)).spliterator(), false)
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.collect(Collectors.toList());
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}
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default Predicate predicateInAnyList(List<String> names1, List<String> names2) {
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return new BooleanBuilder().and(QUserGroup.userGroup.name.in(names1))
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.or(QUserGroup.userGroup.name.in(names2));
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}
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}

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