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Spring Date jpa 获取最新一条数据的实例代码

时间：2020-10-07来源：www.pcxitongcheng.com作者：电脑系统城

#Repository

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7 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

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12 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

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31 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;
}
}

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：

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

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7 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

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7 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));
}