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JAVA-2305: Move Use Criteria Queries in a Spring Data Application to spring-data-jpa-query-2

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This commit is contained in:
Krzysiek
2020-08-10 21:55:24 +02:00
parent ba7a7285fd
commit d8bfa4af43
10 changed files with 62 additions and 14 deletions
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persistence-modules/spring-jpa/README.md
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@@ -10,7 +10,6 @@
- [Self-Contained Testing Using an In-Memory Database](https://www.baeldung.com/spring-jpa-test-in-memory-database)
- [A Guide to Spring AbstractRoutingDatasource](https://www.baeldung.com/spring-abstract-routing-data-source)
- [Obtaining Auto-generated Keys in Spring JDBC](https://www.baeldung.com/spring-jdbc-autogenerated-keys)
- [Use Criteria Queries in a Spring Data Application](https://www.baeldung.com/spring-data-criteria-queries)
- [Many-To-Many Relationship in JPA](https://www.baeldung.com/jpa-many-to-many)
- [Spring Persistence (Hibernate and JPA) with a JNDI datasource](https://www.baeldung.com/spring-persistence-hibernate-and-jpa-with-a-jndi-datasource-2)
persistence-modules/spring-jpa/src/main/java/com/baeldung/persistence/dao/BookRepository.java
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@@ -1,9 +0,0 @@
package com.baeldung.persistence.dao;
import com.baeldung.persistence.model.Book;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
public interface BookRepository extends JpaRepository<Book, Long>, BookRepositoryCustom, JpaSpecificationExecutor<Book> {
}
persistence-modules/spring-jpa/src/main/java/com/baeldung/persistence/dao/BookRepositoryCustom.java
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@@ -1,11 +0,0 @@
package com.baeldung.persistence.dao;
import java.util.List;
import com.baeldung.persistence.model.Book;
public interface BookRepositoryCustom {
List<Book> findBooksByAuthorNameAndTitle(String authorName, String title);
}
persistence-modules/spring-jpa/src/main/java/com/baeldung/persistence/dao/BookRepositoryImpl.java
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@@ -1,45 +0,0 @@
package com.baeldung.persistence.dao;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import com.baeldung.persistence.model.Book;
import org.springframework.stereotype.Repository;
@Repository
public class BookRepositoryImpl implements BookRepositoryCustom {
private EntityManager em;
public BookRepositoryImpl(EntityManager em) {
this.em = em;
}
@Override
public List<Book> findBooksByAuthorNameAndTitle(String authorName, String title) {
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Book> cq = cb.createQuery(Book.class);
Root<Book> book = cq.from(Book.class);
List<Predicate> predicates = new ArrayList<>();
if (authorName != null) {
predicates.add(cb.equal(book.get("author"), authorName));
}
if (title != null) {
predicates.add(cb.like(book.get("title"), "%" + title + "%"));
}
cq.where(predicates.toArray(new Predicate[0]));
TypedQuery<Book> query = em.createQuery(cq);
return query.getResultList();
}
}
persistence-modules/spring-jpa/src/main/java/com/baeldung/persistence/dao/BookService.java
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@@ -1,25 +0,0 @@
package com.baeldung.persistence.dao;
import static com.baeldung.persistence.dao.BookSpecifications.hasAuthor;
import static com.baeldung.persistence.dao.BookSpecifications.titleContains;
import static org.springframework.data.jpa.domain.Specifications.where;
import java.util.List;
import com.baeldung.persistence.model.Book;
import org.springframework.stereotype.Service;
@Service
public class BookService {
private BookRepository bookRepository;
public BookService(BookRepository bookRepository) {
this.bookRepository = bookRepository;
}
public List<Book> query(String author, String title) {
return bookRepository.findAll(where(hasAuthor(author)).and(titleContains(title)));
}
}
persistence-modules/spring-jpa/src/main/java/com/baeldung/persistence/dao/BookSpecifications.java
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@@ -1,16 +0,0 @@
package com.baeldung.persistence.dao;
import com.baeldung.persistence.model.Book;
import org.springframework.data.jpa.domain.Specification;
public class BookSpecifications {
public static Specification<Book> hasAuthor(String author) {
return (book, cq, cb) -> cb.equal(book.get("author"), author);
}
public static Specification<Book> titleContains(String title) {
return (book, cq, cb) -> cb.like(book.get("title"), "%" + title + "%");
}
}
persistence-modules/spring-jpa/src/main/java/com/baeldung/persistence/model/Book.java
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@@ -1,36 +0,0 @@
package com.baeldung.persistence.model;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Book {
@Id
private Long id;
private String title;
private String author;
public Long getId() {
return id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}