SpringData MongoDB 实现CRUD操作

1.增删改

@Test
public void testSave() {
    Article article = new Article();
    article.setId(2);
    article.setTitle("java高级-存在与虚无");
    article.setContent("头发还好吗？");
    article.setHits(10000);
    articleDao.save(article);
}

@Test
public void testDelete() {
    articleDao.deleteById(1);
}

@Test
public void testUpdate() {
    Article article = new Article();
    article.setId(2); // id存在则更新
    article.setTitle("java高级-存在与虚无");
    article.setContent("头发还好吗？头发还好吗？头发还好吗？头发还好吗？头发还好吗？");
    article.setHits(10001);
    articleDao.save(article);
}

2.简单查询

@Test
public void testFindAll() {
    List<Article> list = articleDao.findAll();
    for (Article article : list) {
        System.out.println(article);
    }
}

@Test
public void testFindById() {
    Optional<Article> opt = articleDao.findById(1);
    System.out.println(opt.get());
}

@Test
public void testFindWithPage() {
    Page<Article> page = articleDao.findAll(PageRequest.of(0, 3));
    System.out.println("总页数：" + page.getTotalPages());
    System.out.println("总记录数：" + page.getTotalElements());
    System.out.println("当前页：" + page.getNumber());
    for (Article article : page.getContent()) {
        System.out.println(article);
    }
}

@Test
public void testFindWithSort() {
    Iterable<Article> iterable = articleDao.findAll(Sort.by(Sort.Order.desc("id")));
    for (Article article : iterable) {
        System.out.println(article);
    }
}

@Test
public void testFindWithPageAndSort() {
    PageRequest page = PageRequest.of(1, 10, Sort.by(Sort.Order.desc("hits")));
    Page<Article> all = articleDao.findAll(page);
    System.out.println("总页数：" + all.getTotalPages());
    System.out.println("总记录数：" + all.getTotalElements());
    System.out.println("当前页：" + all.getNumber());
    for (Article article : all.getContent()) {
        System.out.println(article);
    }
}

3.命名规则查询

　　命名规则跟jpa基本一致，常见的如下：

　　　　

　　定义接口：

public interface ArticleDao extends MongoRepository<Article, Integer> {

    // 根据标题模糊查询
    List<Article> findByTitleLike(String title);

    //根据点击量大于？查询
    List<Article> findByHitsGreaterThan(Integer hits);
}

　　测试：

@Test
public void testFindByTitleLike() {
    List<Article> list = articleDao.findByTitleLike("java1");
    for (Article article : list) {
        System.out.println(article);
    }
}

@Test
public void testFindByHitsGreaterThan() {
    List<Article> list = articleDao.findByHitsGreaterThan(200);
    for (Article article : list) {
        System.out.println(article);
    }
}