Spring Date jpa 获取最新一条数据的实例代码

#Repository

import test.demo.domain.entity.TestEntity;
import org.springframework.data.jpa.repository.support.JpaRepositoryImplementation;
import org.springframework.stereotype.Repository;

@Repository
public interface TestEntityRepository extends JpaRepositoryImplementation<TestEntity,Integer> {
}

#Service

import org.springframework.validation.annotation.Validated;
import javax.validation.constraints.NotBlank;

@Validated
public interface TestService {
  /**
   * 获取账号最新的一个数据(指单个字段,例如最新时间,最新年龄等)
   * @param username
   * @return
   */
  String findLastage(@NotBlank String username);
}

#ServiceImpl

import test.demo.domain.entity.TestEntity;
import test.demo.repository.TestEntityRepository;
import test.demo.service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class TestServiceImpl implements TestService {
  @Autowired
  private TestEntityRepository testEntityRepository;

  @Override
  public String findLastAge(String username) {
    Sort createTime = new Sort(Sort.Direction.DESC, "createTime");
    PageRequest of = PageRequest.of(0, 1, createTime);
    List<TestEntity> testEntities= testEntityRepository.findAll(((root, criteriaQuery, criteriaBuilder) -> criteriaBuilder.and(
        criteriaBuilder.equal(root.get("age"), age),
        criteriaBuilder.lessThan(root.get("expiredTime"), LocalDateTime.now())
    )));
    if (testEntities.isEmpty()){
      return null;
    }
    String age = TestEntities.get(0).getCode();
    return age;
  }
}

Entity这里就不写了,很普通,只说重点!

看下官方文档的解释:

Spring Date jpa 获取最新一条数据的实例代码

Spring Date jpa 获取最新一条数据的实例代码

补充知识:【spring data jpa】根据一个时间字段 查询 时间段的处理方法

处理方法 包含结束时间00.00.00

    Date createDate = boxCodeLog.getCreateDate();
        if (createDate != null){
          LocalDate localDate=createDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
          localDate = localDate.plusDays(1);
          Date endDate = java.sql.Date.valueOf(localDate);
          predicates.add(cb.between(root.get("createDate"),createDate,endDate));
        }

包含结束时间 23.59.59

    Date createDate = receipt.getCreateDate();
        if (createDate != null){
          LocalDate localDate=createDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
          localDate = localDate.plusDays(1);
          Date endDate = new Date(java.sql.Date.valueOf(localDate).getTime()-1L);
          predicates.add(cb.between(root.get("createDate"),createDate,endDate));
        }

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Spring Date jpa 获取最新一条数据的实例代码

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