Created
April 17, 2019 02:31
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Base JPA Repository that supports easier dynamic query building.
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package it.murah.license.server.jpa; | |
import java.io.Serializable; | |
import java.util.ArrayList; | |
import java.util.List; | |
import java.util.Map; | |
import javax.persistence.EntityManager; | |
import javax.persistence.criteria.CriteriaBuilder; | |
import javax.persistence.criteria.CriteriaQuery; | |
import javax.persistence.criteria.Path; | |
import javax.persistence.criteria.Root; | |
import org.springframework.data.jpa.repository.support.JpaEntityInformation; | |
import org.springframework.data.jpa.repository.support.SimpleJpaRepository; | |
/** | |
* Makes it easy handling variable property name/values, including inner object | |
* properties. | |
* <p> | |
* e.g.:<br> | |
* map.put("prop1", 1); <br> | |
* map.put("child.prop", "foo"); | |
* <p> | |
* findAllBy(map); // select * from T where prop1=1 and child.prop='foo' | |
* | |
* @since 2019-04-16 | |
* @author Ulisses Lima | |
*/ | |
public class FlexibleJpaRepository<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> { | |
private final EntityManager em; | |
private final JpaEntityInformation<T, ID> ei; | |
public FlexibleJpaRepository(JpaEntityInformation<T, ID> ei, EntityManager em) { | |
super(ei, em); | |
this.em = em; | |
this.ei = ei; | |
} | |
public List<T> findAllBy(Map<String, Object> params) { | |
Class<T> type = ei.getJavaType(); | |
CriteriaBuilder cb = em.getCriteriaBuilder(); | |
CriteriaQuery<T> q = cb.createQuery(type); | |
Root<T> props = q.from(type); | |
List<javax.persistence.criteria.Predicate> predicates = new ArrayList<>(); | |
params.forEach((key, val) -> { | |
String[] path = key.split("\\."); | |
Path<Object> x = props.get(path[0]); | |
if (path.length > 1) { | |
for (int i = 1; i < path.length; i++) { | |
x = x.get(path[i]); | |
} | |
} | |
predicates.add(cb.equal(x, val)); | |
}); | |
q.where(cb.and(predicates.toArray(new javax.persistence.criteria.Predicate[predicates.size()]))); | |
q.orderBy(cb.asc(props.get("id"))); | |
return em.createQuery(q.select(props)).setMaxResults(1000).getResultList(); | |
} | |
} |
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