JPA多条件查询

Page<AoaQuestionHeader> findAll(Specification<AoaQuestionHeader> spec, Pageable pageable);

List<AoaQuestionHeader> headerPage = questionHeaderDao.findAll(new Specification<AoaQuestionHeader>(){

    @Override
    public Predicate toPredicate(Root<AoaQuestionHeader> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
        List<Predicate> list = new ArrayList<Predicate>();
        if (!typeId.equals(0L)){
            list.add(cb.equal(root.get("typeId").as(Long.class),typeId)) ;
        }
        if (!groupId.equals(0L)){
            list.add(cb.equal(root.get("groupId").as(Long.class), groupId)) ;
        }
        if (!leaderId.equals(0L)){
            list.add(cb.equal(root.get("leaderId").as(Long.class), leaderId) );
        }
        Predicate[] p = new Predicate[list.size()];
        return cb.and(list.toArray(p));
    }
}, new PageRequest(page,size , sort));

List<AoaQuestionHeader> findAll(Specification<AoaQuestionHeader> spec);

List<AoaQuestionHeader> hlist = questionHeaderDao.findAll(new Specification<AoaQuestionHeader>(){

    @Override
    public Predicate toPredicate(Root<AoaQuestionHeader> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
        List<Predicate> list = new ArrayList<Predicate>();
        if (!typeId.equals(0L)){
            list.add(cb.equal(root.get("typeId").as(Long.class),typeId)) ;
        }
        if (!groupId.equals(0L)){
            list.add(cb.equal(root.get("groupId").as(Long.class), groupId)) ;
        }
        if (!leaderId.equals(0L)){
            list.add(cb.equal(root.get("leaderId").as(Long.class), leaderId) );
        }
        Predicate[] p = new Predicate[list.size()];
        return cb.and(list.toArray(p));
    }
});





这么个意思，自己的笔记看不懂勿用