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Gist com codigo complementar ao post descrevendo como trabalhar com Spring Data JPA e Criteria da JPA 2, via Specifications.
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import org.springframework.data.jpa.repository.JpaRepository; | |
import org.springframework.data.jpa.repository.JpaSpecificationExecutor; | |
import org.springframework.stereotype.Repository; | |
import br.com.yaw.springdatajpa.model.Mercadoria; | |
/** | |
* Contrato de persistência da entidade Mercadoria. | |
* | |
* @author <a href="mailto:eder@yaw.com.br">Eder Magalhães</a> | |
*/ | |
@Repository | |
public interface MercadoriaRepository | |
extends JpaRepository<Mercadoria, Long>, JpaSpecificationExecutor<Mercadoria> { | |
} | |
/*********************************************************************************************/ | |
import java.util.ArrayList; | |
import java.util.List; | |
import javax.persistence.criteria.CriteriaBuilder; | |
import javax.persistence.criteria.CriteriaQuery; | |
import javax.persistence.criteria.Predicate; | |
import javax.persistence.criteria.Root; | |
import org.springframework.data.jpa.domain.Specification; | |
import br.com.yaw.springdatajpa.model.FiltrosPesquisaMercadoria; | |
import br.com.yaw.springdatajpa.model.Mercadoria; | |
import com.google.common.base.Strings; | |
/** | |
* Determina as <code>Specification<code>(s) da entidade <code>Mercadoria</code>. | |
* | |
* @author <a href="mailto:eder@yaw.com.br">Eder Magalhães</a> | |
*/ | |
public final class MercadoriaSpecification { | |
private MercadoriaSpecification() { | |
} | |
public static Specification<Mercadoria> byNome(String name) { | |
return new Specification<Mercadoria>() { | |
@Override | |
public Predicate toPredicate(Root<Mercadoria> root, | |
CriteriaQuery<?> query, CriteriaBuilder builder) { | |
return builder.like(root.<String>get("nome"), | |
String.format("%s%", name.trim())); | |
} | |
}; | |
} | |
public static Specification<Mercadoria> byCriterio(FiltrosPesquisaMercadoria filtros) { | |
return new Specification<Mercadoria>() { | |
@Override | |
public Predicate toPredicate(Root<Mercadoria> root, | |
CriteriaQuery<?> query, CriteriaBuilder builder) { | |
List<Predicate> predicates = new ArrayList<>(); | |
if (!Strings.isNullOrEmpty(filtros.getDescricaoMercadoria())) { | |
predicates.add(builder.like(root.<String>get("descricao"), | |
filtros.getDescricaoMercadoria())); | |
} | |
if (!Strings.isNullOrEmpty(filtros.getNomeMercadoria())) { | |
predicates.add(builder.like(root.<String>get("nome"), | |
filtros.getNomeMercadoria())); | |
} | |
if (filtros.getPrecoDe() != null && filtros.getPrecoDe() > 0) { | |
predicates.add(builder.ge(root.<Double>get("preco"), | |
filtros.getPrecoDe())); | |
} | |
if (filtros.getPrecoAte() != null && filtros.getPrecoAte() > 0) { | |
predicates.add(builder.le(root.<Double>get("preco"), | |
filtros.getPrecoAte())); | |
} | |
return builder.and(predicates.toArray(new Predicate[]{})); | |
} | |
}; | |
} | |
} | |
/*********************************************************************************************/ | |
import org.springframework.beans.factory.annotation.Autowired; | |
import org.springframework.web.bind.annotation.PathVariable; | |
import org.springframework.data.jpa.domain.Specification; | |
import org.springframework.web.bind.annotation.RequestMapping; | |
import org.springframework.web.bind.annotation.RequestMethod; | |
import org.springframework.web.bind.annotation.RestController; | |
import br.com.yaw.springdatajpa.model.FiltrosPesquisaMercadoria; | |
import br.com.yaw.springdatajpa.model.Mercadoria; | |
import br.com.yaw.springdatajpa.model.PesquisaMercadorias; | |
import br.com.yaw.springdatajpa.persistence.MercadoriaRepository; | |
import br.com.yaw.springdatajpa.persistence.MercadoriaSpecification; | |
import com.google.common.collect.Lists; | |
/** | |
* Controller das funcionalidade sobre a <code>Mercadoria</code>. | |
* | |
* @author <a href="mailto:eder@yaw.com.br">Eder Magalhães</a> | |
*/ | |
@RestController | |
@RequestMapping(value="/") | |
public class MercadoriaController { | |
@Autowired | |
private MercadoriaRepository repository; | |
@RequestMapping(method = RequestMethod.GET) | |
public PesquisaMercadorias list(FiltrosPesquisaMercadoria filtros) { | |
Specification<Mercadoria> specification = MercadoriaSpecification.byCriterio(filtros); | |
long total = repository.count(specification); | |
List<Mercadoria> mercadorias = | |
Lists.newArrayList(repository.findAll(specification)); | |
return new PesquisaMercadorias(total, mercadorias); | |
} | |
@RequestMapping(method = RequestMethod.GET, value="/{nome}") | |
public List<Mercadoria> listByNome(@PathVariable String nome) { | |
Specification<Mercadoria> specification = MercadoriaSpecification.byNome(nome); | |
return Lists.newArrayList(repository.findAll(specification)); | |
} | |
} |
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ficou ótimo! eu colocaria o MercadoriaSpecification como um @component e chamaria ele diretamente
Valeu!