SpringBoot

【黑马程序员SpringBoot2全套视频教程，springboot零基础到项目实战（spring boot2完整版）】

SpringBoot 开发实用篇

4 数据层解决方案

4.18 查询文档

4.18.1 查询文档

之前我们已经将数据库中一共17 条数据全部搞到ES 中去了

现在就剩用Java 代码查他 了

【查询单个】

//按id查询
@Test
void testGet() throws IOException {
    GetRequest request = new GetRequest("books","1");
    GetResponse response = client.get(request, RequestOptions.DEFAULT);

    System.out.println(response.getSourceAsString());
}

运行结果

没毛病

【按条件查询】

@Test
//按条件查询
void testSearch() throws IOException {

    SearchRequest request = new SearchRequest("books");

    SearchSourceBuilder builder = new SearchSourceBuilder();
    builder.query(QueryBuilders.termQuery("name","java"));
    request.source(builder);

    SearchResponse response = client.search(request, RequestOptions.DEFAULT);
    SearchHits hits = response.getHits();
    for (SearchHit hit : hits) {
        String sourceAsString = hit.getSourceAsString();
        System.out.println(sourceAsString);
    }
}

条件是name 中包含java 的

运行结果

没毛病！

改成spring

没毛病！

如果想name 和 description 一块儿用

运行结果

没毛病

还可以把查出来的东西都转成我们的对象

    @Test
    //按条件查询
    void testSearch() throws IOException {

        SearchRequest request = new SearchRequest("books");

        SearchSourceBuilder builder = new SearchSourceBuilder();
        builder.query(QueryBuilders.termQuery("all","spring"));
        request.source(builder);

        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        SearchHits hits = response.getHits();
        for (SearchHit hit : hits) {
            String sourceAsString = hit.getSourceAsString();
//            System.out.println(sourceAsString);
            Book book = JSON.parseObject(sourceAsString, Book.class);
            System.out.println(book);
        }
    }

妙啊

【删除、修改这些老师让我们自己玩儿了】

回顾一下

【按id 查】

【按条件查】

4.18.2 小结

1. 根据id查询文档
2. 根据条件查询文档

4.18.3 总结

1. Redis
2. Mongodb
3. ElasticSearch