Spring Data JPA自定义查询，分页，排序

1，自定义的repository 需要继承这2个接口

public interface AdviceClassRepository extends JpaRepository<AdviceClass,Long>,JpaSpecificationExecutor<AdviceClass> {

}

JpaRepository作用：支持基本的增删改查和排序功能
JpaSpecificationExecutor作用：支持自定义查询和分页及排序

下面2个示例 展示自定义查询

public Page<AdviceClass> findAll(AdviceClass adviceClass, PageRequest pageRequest) {
        /*Sort sort = new Sort(Sort.Direction.ASC, "orderNumber","id");//这里是用POJO的属性，不是表里面*/
//        Pageable pageable = new PageRequest(pageRequest.getPageNumber(),pageRequest.getPageSize(), new Sort(Sort.Direction.ASC, new String[]{"orderNumber"}));
        return  adviceClassRepository.findAll(Specifications.where(new Specification<AdviceClass>() {
                    @Override
                    public Predicate toPredicate(Root<AdviceClass> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
                        Predicate predicate=cb.conjunction();
                        if(adviceClass!=null){
                            if(StringUtils.isNotBlank(adviceClass.getAdviceName())){
                                predicate.getExpressions().add(cb.like(root.<String>get("adviceName"),"%"+StringUtils.trim(adviceClass.getAdviceName())+"%"));
                            }
                            if(adviceClass.getActive()!=null){
                                predicate.getExpressions().add(cb.equal(root.<Short>get("active"), adviceClass.getActive()));
                            }
                            if(StringUtils.isNotBlank(adviceClass.getRemark())){
                                predicate.getExpressions().add(cb.like(root.<String>get("remark"),"%"+StringUtils.trim(adviceClass.getRemark())+"%"));
                            }
                        }
                        return predicate;
                    }
                }),pageRequest);

    }
//注意下pageRequest的分页对象，第一页是page=0

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