public interface ProductDao extends Repository<Product , Long> {  
@Query("select * from Product p where p.id= ?1") 
public Product findById(Long id); 
 
@Query("select * from Product p where p.type = ?1 and p.name =?2") 
public Page<Product> findByTypeAndName( 
    Integer type,String name,Pageable pageable); 
}

public interface ProductDao extends Repository<Product , Long> {  
@Query("from Product p where p.goodsName= :name") 
public Product findByGoodsName(@Param("name")String name);  
@Query("from Product p where p.num < :num") 
public Page<Product> findByNumLessThan( 
    @Param("num")Integer num,Pageable pageable); 
}

 
@Query("update Product p set p.name = ?1 where p.id = ?2") 
@Modifying 
public int updateName(String name, int id);

+-------------+--------------+------+-----+-------------------+----------------+
| Field       | Type         | Null | Key | Default           | Extra          |
+-------------+--------------+------+-----+-------------------+----------------+
| id          | int(11)      | NO   | PRI | NULL              | auto_increment |
| role        | varchar(45)  | NO   |     | NULL              |                |
| permissions | varchar(512) | NO   |     | NULL              |                |
| create_time | datetime     | NO   |     | CURRENT_TIMESTAMP |                |
| status      | varchar(45)  | NO   |     | NULL              |                |
| role_name   | varchar(45)  | NO   |     | NULL              |                |
+-------------+--------------+------+-----+-------------------+----------------+

@Repository
public interface RoleRepository extends CrudRepository<RoleData, Integer> {
}  
@Entity
@Table(name = "role", catalog = "message_push")
public class RoleData implements java.io.Serializable {
 
    @Id
    @GeneratedValue
    private Integer id; 
    private String role; 
    private String permissions; 
    private Long create_time; 
    private Integer status; 
// getter setter 構(gòu)造函數(shù)從略 
}

@Repository
public interface RoleRepository extends CrudRepository<RoleData, Integer> { 
    List<RoleData> findByRole(String role);
    List<RoleData> findByStatus(String status);
}

@Repository
public interface RoleRepository extends CrudRepository<RoleData, Integer> { 
    List<RoleData> findByRoleAndStatus(String role, String status);
}

    List<RoleData> findByRoleOrStatus(String role, String status);

@Query(value = "select * from role where role = ?1", nativeQuery = true)
List<RoleData> searchByRole(String role);

@Query(value = "select * from role where role in (?1) and status = 'valid'", nativeQuery = true)
List<RoleData> searchByRoleList(List<String> targetList);

@Query(value = "select * from role where role like %?1%", nativeQuery = true)
List<RoleData> searchByRole(String keyWord);

@Repository
public interface RoleRepository extends CrudRepository<RoleData, Integer>, JpaSpecificationExecutor<RoleData> {

        final Specification<RoleData> spec = new Specification<RoleData> () {
            @Override
            public Predicate toPredicate(Root<RoleData> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
                Predicate predicate = criteriaBuilder.like(root.get("role"), "%a%");
                return predicate;
            }
        };

roleRepository.findAll(spec);

where attribute = xx
where attribute > xx 
where attribute < xx
where attribute like %xx%

[  select * from role where role like '%a%' and (id > 11 or id < 8) ] 

        final Specification<RoleData> spec = new Specification<RoleData> () {
            @Override
            public Predicate toPredicate(Root<RoleData> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
                Predicate roleLikeaPredicate = criteriaBuilder.like(root.get("role"), "%a%");
                Predicate idLessThan8Predicate = criteriaBuilder.lessThan(root.get("id"), 8);
                Predicate idGreaterThan12Predicate = criteriaBuilder.greaterThan(root.get("id"), 11);
 
                Predicate idCombindedPredicate = criteriaBuilder.or(idLessThan8Predicate, idGreaterThan12Predicate);
                Predicate predicate = criteriaBuilder.and(idCombindedPredicate, roleLikeaPredicate); 
                return predicate;
            }
        };

 
        final Specification<RoleData> spec2 = new Specification<RoleData> () {
            @Override
            public Predicate toPredicate(Root<RoleData> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
                List<String> alist = new ArrayList<String>();
                alist.add("admin");
                Predicate predicate = root.get("role").in(alist);
                return predicate;
            }
        };