spring data jpa 是一个封装了hebernate的dao框架,用于单表操作特别的方便,当然也支持多表,只不过要写sql。对于单表操作,jpake可以通过各种api进行搞定,下面是一个对一个表或者对象进行
多字段查询的案例,可以看到jpa的单表查询是多么的强大
1,先看这个对象--表映射所包含的字段
父类
@MappedSuperclass
public abstract class EntityBase implements Serializable {
/** 0-有效;9-删除 */
private Integer status; //0-有效;9-删除
/** 创建时间 */
private Date createTime; //创建时间
/**
* 创建账号
*/
private Long createUser; //创建账号
/**
* 更新时间
*/
private Date updateTime; //更新时间
/**
* 更新账号
*/
private Long updateUser; //更新账号
这个对象
@Entity
@Table(name = "park_record_pay")
public class ParkRecordPayPo extends EntityBase {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
/** 所属停车场编号 */
private String idPark;
/** 停车场简单名称 */
@Transient
private String parkName;
/** 进场流水 */
private String idInRecord;
/** 收费流水 */
private String idPayRecord;
/** 收费员名称 */
private String tollName;
/** 车牌号 */
private String carNum;
/** 应收金额【单位分】 */
private Long dueFee;
/** 已收金额【单位分】 */
private Long paidFee;
/** 优惠金额【单位分】 */
private Long couponFee;
/** 实收金额【单位分】 */
private Long netFee;
/** 付款方式 */
private String payMode;
/** 停车时长 */
private Long parkDuration;
/** 付费时间 */
private Date payTime;
这是查询的实现过程
这个是查询date字段时所要用到的工具类,要注入dao层
@Autowired
private ParkRecordPayRepository parkRecordPayRepository;
Date dayjia1(Date date){
Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
calendar.add(calendar.DATE, 1);//把日期往后增加一天.整数往后推,负数往前移动
date=calendar.getTime(); //这个时间就是日期往后推一天的结果
return date;
}
@Override
public ParkRecordPayPoList getParkRecordPayList(String idPark, ParkRecordPayPo parkPayInfoPo, Integer page, Integer pageSize) {
// 把page ,pagesize 封装到pageable对象里面,并且可以按“updateTime”字段进行排序
Pageable pageable = new PageRequest(page,pageSize,new Sort(Sort.Direction.DESC,"updateTime"));
//这个查询要用匿名函数,所以传入的参数要加final,否则传不进去
final ParkRecordPayPo searchParkPayInfoPo = parkPayInfoPo;
Page<ParkRecordPayPo> searchListPage = parkRecordPayRepository.findAll(new Specification<ParkRecordPayPo>() {
@Override
public Predicate toPredicate(Root<ParkRecordPayPo> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder cb) {
if(searchParkPayInfoPo != null){
List<Predicate> list = new ArrayList<Predicate>();
//下面是拼接各个查询条件,有就拼接,没有就跳过,不做查询条件,用list进行拼接确实方便明了
if (!StringUtils.isEmpty(searchParkPayInfoPo.getIdPark())) {
list.add(cb.equal(root.get("idPark").as(String.class), searchParkPayInfoPo.getIdPark()));
}
//这个是个模糊查询
if (!StringUtils.isEmpty(searchParkPayInfoPo.getCarNum())) {
// list.add(cb.equal(root.get("carNum").as(String.class), searchParkPayInfoPo.getCarNum()));
list.add(cb.like(root.get("carNum").as(String.class), "%" + searchParkPayInfoPo.getCarNum().toUpperCase() + "%"));
}
if (!StringUtils.isEmpty(searchParkPayInfoPo.getPayMode())) {
list.add(cb.equal(root.get("payMode").as(Integer.class), searchParkPayInfoPo.getPayMode()));
}
//这个是对类型为date的字段的操作
if (!StringUtils.isEmpty(searchParkPayInfoPo.getPayTime())&&!StringUtils.isEmpty(searchParkPayInfoPo.getTollName())) {
list.add(cb.between(root.<Date>get("payTime"), searchParkPayInfoPo.getPayTime(), dayjia1(searchParkPayInfoPo.getPayTime())));
if(searchParkPayInfoPo.getTollName().equals("null")){
list.add(cb.isNull(root.get("tollName").as(String.class)));
}else{
list.add(cb.equal(root.get("tollName").as(String.class), searchParkPayInfoPo.getTollName()));
}
}
if (!StringUtils.isEmpty(searchParkPayInfoPo.getPayTime())&&StringUtils.isEmpty(searchParkPayInfoPo.getTollName())) {
list.add(cb.greaterThanOrEqualTo(root.<Date>get("payTime"), searchParkPayInfoPo.getPayTime()));
}
Predicate[] p = new Predicate[list.size()];
criteriaQuery.where(cb.and(list.toArray(p)));
}
criteriaQuery.orderBy(cb.desc(root.get("updateTime").as(Date.class)));
return criteriaQuery.getRestriction();
}
}, pageable);
return ParkRecordPayPoList.wrap(searchListPage.getContent(), Integer.valueOf(searchListPage.getTotalElements() + ""));
}
2 这个是在dao层的实现
public interface ParkRecordPayRepository extends PagingAndSortingRepository<ParkRecordPayPo, Long> ,JpaSpecificationExecutor<ParkRecordPayPo> {
//获取时间轴后的数据并分页输出
Page<ParkRecordPayPo> findByIdParkAndUpdateTimeGreaterThan(String idPark, Date updateTime, Pageable pageable);
//获取时间轴后的数据(status = ?)并分页输出
Page<ParkRecordPayPo> findByIdParkAndStatusAndUpdateTimeGreaterThan(String idPark, Integer status
, Date updateTime, Pageable pageable);
// 分页查询,屏蔽逻辑删除
Page<ParkRecordPayPo> findByIdParkAndUpdateTimeGreaterThanAndStatusNot(String idPark, Date updateTime
, int status, Pageable pageable);
// 根据主键获取客户支付停车费记录
ParkRecordPayPo findById(Long id);
// 删除 【逻辑删除】
@Modifying
@Query("update ParkRecordPayPo p set p.status = ?1, p.updateTime = ?2 where p.id = ?3")
int updateStatusAndUpdateTime(Integer status, Date updateTime, Long id);
List<ParkRecordPayPo> findAll();
//多条件搜索
List<ParkRecordPayPo> findAll(Specification<ParkRecordPayPo> specification);
//带分页获取,我们用到的就是这个
Page<ParkRecordPayPo> findAll(Specification<ParkRecordPayPo> specification,Pageable pageable);
@Query("select p from ParkRecordPayPo p where p.idPark = ?1 and p.payMode = ?2 and date(p.payTime) between ?3 and ?4 order by p.payTime desc ")
List<ParkRecordPayPo> findRecordPay(String idPark, String payMode, Date startDate, Date endDate);
@Query("select p from ParkRecordPayPo p where p.idPark = ?1 and date(p.payTime) between ?2 and ?3 order by p.payTime desc")
List<ParkRecordPayPo> findRecordPayNoMode(String idPark, Date startDate, Date endDate);
}
3 配置
dao层的配置
@Configuration
@EnableJpaRepositories("com.yun.park.dao.repository")
@EntityScan("com.yun.park.api.admin.entity")
public class DaoConfig {}
总配置
@Configuration
@Import({DaoConfig.class, ServiceConfig.class})
public class ServerConfig {
@Bean
@ConfigurationProperties("park-server")
ParkServerProperties parkServerProperties() {
return new ParkServerProperties();
}