Spring Data JPA條件查詢

背景：

最近正在將專案的持久層框架的Spring Data JPA更換成為mybatis，所以留個念想。

程式碼

@Override
public Page<Blog> listBlog(Pageable pageable, BlogQuery blog) {
    return blogMapper.findAll(new Specification<Blog>() {
        @Override
        public Predicate toPredicate(Root<Blog> root, CriteriaQuery<?> cq, CriteriaBuilder cb) {
            List<Predicate> predicates=new ArrayList<>();
            //名稱的模糊查詢
            if (!"".equals(blog.getTitle()) && blog.getTitle()!=null){
                predicates.add(cb.like(root.<String>get("title"),"%"+blog.getTitle()+"%"));
            }
            //型別的查詢
            if (blog.getTypeId() != null) {
                predicates.add(cb.equal(root.<Type>get("type").get("id"),blog.getTypeId()));
            }
            //是否推薦的查詢
            if (blog.isRecommend()) {
                predicates.add(cb.<Boolean>equal(root.get("recommend"),blog.isRecommend()));
            }
            cq.where(predicates.toArray(new Predicate[predicates.size()]));
            return null;
        }
    },pageable);
}