PS:一半轉(zhuǎn)載，一半自己的用例

作者：javaniu

鏈接：https://www.zhihu.com/question/37873032/answer/73991650
來源：知乎
著作權(quán)歸作者所有，轉(zhuǎn)載請聯(lián)系作者獲得授權(quán)。（ PS:暫時(shí)沒有知乎賬號，所以沒有聯(lián)系原作者，請?jiān)髡咭娬?#xff01;）

springdata jpa總結(jié)的查詢方法有如下：

findOneByName按用戶名查詢User對象

findAllByLargeThanId查詢id號大于指定參數(shù)值的User對象列表，分頁P(yáng)age返回

findAllByIdAndName查詢id和用戶名等于指定參數(shù)值的User對象，可以通過多個(gè)Predicate來查詢

findAllByLikeName模糊分頁查詢用戶名，like查詢

findAllByInIds查詢指定的id集合用戶對象列表

findAllByIds通過原生sql查詢指定的用戶id對象列表

findAllByName通過JPA query查詢用戶名等于指定值的用戶對象

多個(gè)排序語法: Sort sort = new Sort(Direction.DESC, "sort").and(new Sort(Direction.DESC, "id"));

package com.zuidaima.springdata.service.impl;import java.util.ArrayList; import java.util.List;import javax.annotation.Resource; import javax.persistence.criteria.CriteriaBuilder; import javax.persistence.criteria.CriteriaQuery; import javax.persistence.criteria.Path; import javax.persistence.criteria.Predicate; import javax.persistence.criteria.Root;import org.springframework.data.domain.Page; import org.springframework.data.domain.PageRequest; import org.springframework.data.domain.Pageable; import org.springframework.data.domain.Sort; import org.springframework.data.domain.Sort.Direction; import org.springframework.data.jpa.domain.Specification; import org.springframework.stereotype.Service;import com.zuidaima.springdata.entity.User; import com.zuidaima.springdata.repository.UserRepository; import com.zuidaima.springdata.service.UserService;/** * *@author javaniu 2013-06-04 22:27:23 */@Service public class UserServiceImpl implements UserService {@Resourcepublic UserRepository userRepository;@Overridepublic User findOneByName(final String name) {Specification<User> specification = new Specification<User>() {@Overridepublic Predicate toPredicate(Root<User> root,CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {Predicate _name = criteriaBuilder.equal(root.get("name"), name);return criteriaBuilder.and(_name);}};return userRepository.findOne(specification);}@Overridepublic Page<User> findAllByLargeThanId(final Long id, int page, int count,Sort sort) {Specification<User> specification = new Specification<User>() {@Overridepublic Predicate toPredicate(Root<User> root,CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {Path<Long> $id = root.get("id");Predicate _id = criteriaBuilder.gt($id, id);return criteriaBuilder.and(_id);}};Pageable pageable = new PageRequest(page - 1, count, sort);return userRepository.findAll(specification, pageable);}@Overridepublic User findAllByIdAndName(final Long id, final String name) {Specification<User> specification = new Specification<User>() {@Overridepublic Predicate toPredicate(Root<User> root,CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {List<Predicate> predicates = new ArrayList<Predicate>();Path<Long> $id = root.get("id");Predicate _id = criteriaBuilder.equal($id, id);predicates.add(_id);Path<Long> $name = root.get("name");Predicate _name = criteriaBuilder.equal($name, name);predicates.add(_name);return criteriaBuilder.and(predicates.toArray(new Predicate[] {}));}};return userRepository.findOne(specification);}@Overridepublic Page<User> findAllByLikeName(final String name, int page, int count) {Specification<User> specification = new Specification<User>() {@Overridepublic Predicate toPredicate(Root<User> root,CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {Path<String> _name = root.get("name");Predicate _key = criteriaBuilder.like(_name, "%" + name + "%");return criteriaBuilder.and(_key);}};Sort sort = new Sort(Direction.DESC, "id");Pageable pageable = new PageRequest(page - 1, count, sort);return userRepository.findAll(specification, pageable);}@Overridepublic Page<User> findAllByInIds(final List<Long> ids) {Specification<User> specification = new Specification<User>() {@Overridepublic Predicate toPredicate(Root<User> root,CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {return criteriaBuilder.in(root.get("id")).value(ids);}};int page = 1;int count = ids.size();Sort sort = new Sort(Direction.DESC, "id");Pageable pageable = new PageRequest(page - 1, count, sort);return userRepository.findAll(specification, pageable);}@Overridepublic List<User> findAllByIds(List<Long> ids) {return userRepository.findAllByIds(ids);}@Overridepublic User findAllByName(String name) {return userRepository.findAllByName(name);}} ===================================== 華麗分割線 =============================================== 以下是我在項(xiàng)目中的實(shí)際運(yùn)用： 1.實(shí)體類：GsTest(這里就不貼代碼了) 2.Dao層： @Repositorypublic interface GsTestDao extends JpaRepository<GsTest, Long>,JpaSpecificationExecutor<GsTest>{ ?} 3.Service層 :（也可以是單獨(dú)的某個(gè)參數(shù)，詳情見上面），page:頁數(shù)，conut:每頁的條數(shù)，sort:排序 Page<GsTest> findOneByName(GsTest gsTest,int page,int count,Sort sort); 4.ServiceImpl層 //分頁 ?條件為年齡和 姓名。 @Override public Page<GsTest> findOneByName(final GsTest gsTest,int page,int count,Sort sort) { Specification<GsTest> specification = new Specification<GsTest>() { @Override public Predicate toPredicate(Root<GsTest> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) { List<Predicate> predicates = new ArrayList<Predicate>(); //參數(shù)非空判斷。不為空則加此條件 if (!gsTest.getAge().isEmpty()) { Predicate _age = criteriaBuilder.equal(root.get("age"), gsTest.getAge()); predicates.add(_age); System.out.println("_age:"+gsTest.getAge().isEmpty()); } Predicate _name = criteriaBuilder.equal(root.get("name"), gsTest.getName()); predicates.add(_name); //return criteriaBuilder.and(_name); return criteriaBuilder.and(predicates.toArray(new Predicate[]{})); } }; 4.controller:控制層 /** *? * @param gsTestDto 實(shí)體，用來接收傳來JSON類型參數(shù) * @param pageNumber ?頁數(shù) * @param pageSize ? 條數(shù) * @return */ @RequestMapping(value="/fin",method = RequestMethod.POST) @ResponseBody public ?Page<GsTest> findTest(@RequestBody GsTestDto gsTestDto,@RequestParam(value = "page", defaultValue = "1") int pageNumber, @RequestParam(value = "size", defaultValue = Constants.PAGE_SIZE_10) int pageSize){ GsTest gsTest = new GsTest(); gsTest=converterIn.convertIn(gsTestDto); System.out.println("GsTestDto:"+gsTest); //排序 Sort sort = new Sort(Direction.ASC, "id"); Page<GsTest> findOneByName = gsTestDaoService.findOneByName(gsTest,pageNumber,pageSize,sort); return findOneByName; } 到此，條件分頁就完成了。看看測試結(jié)果： 我用的是 谷歌的Postman來進(jìn)行測試： 1.傳參： { "name": "jak" } 結(jié)果： {"content": [{"id": 3,"properties_string": null,"name": "jak","age": "21","sex": "女","status": "1","certime": "2013-05-11 09:00:00"},{"id": 4,"properties_string": null,"name": "jak","age": "21","sex": "女","status": "1","certime": "2013-05-11 09:00:00"},{"id": 5,"properties_string": null,"name": "jak","age": "21","sex": "女","status": "1","certime": "2013-05-11 09:00:00"}],"size": 10,"number": 0,"sort": [{"direction": "ASC","property": "id","ascending": true}],"lastPage": true,"firstPage": true,"totalPages": 1,"totalElements": 3,"numberOfElements": 3 } 2.傳錯(cuò)誤的參數(shù)： {"name": "jak","age":"22" } 結(jié)果： {"content": [],"size": 10,"number": 0,"sort": [{"direction": "ASC","property": "id","ascending": true}],"lastPage": true,"firstPage": true,"totalPages": 0,"totalElements": 0,"numberOfElements": 0 } 可以看得到 查不到的時(shí)候。content 是空值！ 到此，簡單的條件分頁查詢就完成了，我也是小白，不妥之處見諒！===============2017年3月2日10:28:46======= 華麗分割線 =============================================== 注：接著上面的 實(shí)體類：prid實(shí)體類中有一個(gè)時(shí)間屬性：private Date beginTime; private Date endTime;
JPA 查詢運(yùn)用的時(shí)候應(yīng)該是：
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd");
Predicate dueTime = criteriaBuilder.between(root.<Date>get("dueTime"),sdf2.parse(prid.getBeginTime()),sdf2.parse(prid.getEndTime()));

注：parse()返回的是一個(gè)Date類型數(shù)據(jù)

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