JPA Specification常用查询+排序实例

public interface TblCarton2RCardLogRepository extends JpaRepository<TblCarton2RCardLog, String>,JpaSpecificationExecutor<TblCarton2RCardLog> {

tblCarton2RCardLogRepository.findAll(new Specification<TblCarton2RCardLog>() {
    @Override
    public  Predicate toPredicate(Root<TblCarton2RCardLog> root, CriteriaQuery<?> query,CriteriaBuilder cb) {
        List<Predicate> list = new ArrayList<Predicate>();
        list.add(cb.equal(root.get("cartonNo").as(String.class), cartonNo));//某普通字段
        list.add(cb.equal(root.get("id").get("rCard").as(String.class), rCard));//主键中某字段
        list.add(cb.like(root.get("mocode").as(String.class), "%" + mocode + "%"));//like
        list.add(cb.between(root.get("frozenDate").as(Long.class), frozenDateStart, frozenDateEnd));//between and
        list.add(cb.greaterThanOrEqualTo(root.get("id").get("rcard").as(String.class), rCardStart));//大于等于
        list.add(root.get("id").get("lotNo").as(String.class).in(lotNos));//in
        //ORDER BY packdate DESC,packtime DESC
        Predicate[] p = new Predicate[list.size()];
        query.where(cb.and(list.toArray(p)));
        query.orderBy(cb.desc(root.get("packDate")),cb.desc(root.get("packTime")));
        return query.getRestriction();
    }
});

@Data
public class DeptSort {
private String id;//编码
private String name;//名称
private String highDeptName;//上级部门
private String principal;//负责人
private String deptType;//部门类型
private String enable;//启用
}

public ResponseModel table(@RequestParam("search")String search,
@RequestParam("pageNumber")Integer pageNumber,
@RequestParam("pageSize")Integer pageSize,
@RequestBody DeptSort deptSort){
ResponseModel model = null;
try {
List<Sort.Order> orders = new ArrayList<Sort.Order>();
if (StringUtils.isNotBlank(deptSort.getId())){
orders.add(new Sort.Order(Sort.Direction.fromString(deptSort.getId()),"id"));
}
if (StringUtils.isNotBlank(deptSort.getName())){
orders.add(new Sort.Order(Sort.Direction.fromString(deptSort.getName()),"name"));
}
if (StringUtils.isNotBlank(deptSort.getHighDeptName())){
orders.add(new Sort.Order(Sort.Direction.fromString(deptSort.getHighDeptName()),"highDeptName"));
}
if (StringUtils.isNotBlank(deptSort.getPrincipal())){
orders.add(new Sort.Order(Sort.Direction.fromString(deptSort.getPrincipal()),"principal"));
}
if (StringUtils.isNotBlank(deptSort.getDeptType())){
orders.add(new Sort.Order(Sort.Direction.fromString(deptSort.getDeptType()),"deptType"));
}
if (StringUtils.isNotBlank(deptSort.getEnable())){
orders.add(new Sort.Order(Sort.Direction.fromString(deptSort.getEnable()),"enable"));
}
//orders不能为空，所以如果为空设置按id排序[/code][code] if (orders.size() == 0){
orders.add(new Sort.Order(Sort.Direction.ASC,"id"));
}
Sort sort = new Sort(orders);
Pageable pageable = new PageRequest(pageNumber,pageSize,sort);
Page<Businessdept> all = service.findAll(search, pageable);
model = ResponseModel.getSuccessResponseModel().setData(all);
}catch (Exception e){
e.printStackTrace();
model = ResponseModel.getFailedResponseModel();
}
return model;
}

List<Sort.Order> orders = new ArrayList<Sort.Order>();

orders.add(new Sort.Order(Sort.Direction.fromString(deptSort.getEnable()),"enable"))

Hibernate: 
/* select
count(generatedAlias0) 
from
Businessdept as generatedAlias0 
where
(
generatedAlias0.name like :param0 
) 
and (
generatedAlias0.deleteIs=1 
) */ select
count(businessde0_.id) as col_0_0_ 
from
t_department businessde0_ 
where
(
businessde0_.name like ?
) 
and businessde0_.delete_is=1
Hibernate: 
/* select
generatedAlias0 
from
Businessdept as generatedAlias0 
where
(
generatedAlias0.name like :param0 
) 
and (
generatedAlias0.deleteIs=1 
) 
order by
generatedAlias0.deptType asc,
generatedAlias0.enable desc */ select
businessde0_.id as id1_3_,
businessde0_.delete_is as delete_i2_3_,
businessde0_.dept_type as dept_typ3_3_,
businessde0_.enable as enable4_3_,
businessde0_.high_dept_id as high_dep5_3_,
businessde0_.high_dept_name as high_dep6_3_,
businessde0_.name as name7_3_,
businessde0_.principal as principa8_3_ 
from
t_department businessde0_ 
where
(
businessde0_.name like ?
) 
and businessde0_.delete_is=1 
order by
businessde0_.dept_type asc,
businessde0_.enable desc limit ?