靜態查詢　

    extends JpaRepository<Stu,Integer>

動態查詢　

    extends JpaSpecificationExecutor<Stu>

@Repository
public interface StuDao extends JpaRepository<Stu,Integer>, JpaSpecificationExecutor<Stu> {

}

    JpaSpec的詳情

public interface JpaSpecificationExecutor<T> {
    T findOne(Specification<T> var1);

    List<T> findAll(Specification<T> var1);

    Page<T> findAll(Specification<T> var1, Pageable var2);

    List<T> findAll(Specification<T> var1, Sort var2);

    long count(S
 

Specification<T>介面詳情

public interface Specification<T> {
    Predicate toPredicate(Root<T> var1, CriteriaQuery<?> var2, CriteriaBuilder var3);
}

程式碼

@Autowired
    StuDao stuDao;

    @Test
    public void spec() {

        Specification<Stu> stuSpecification = new Specification<Stu>() {
            @Override
            public Predicate toPredicate(Root<Stu> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {

                Predicate p1 = criteriaBuilder.equal(root.get("name"),"小明");
                Predicate p2 = criteriaBuilder.equal(root.get("msg"),"資訊");
                Predicate p3 = criteriaBuilder.and(p1,p2);
                return p3;
            }
        };
        //動態查詢
        stuDao.findOne(stuSpecification);
    }