ES6.6.2 使用小结 - 全量查询数据

红太狼 2022-02-28 04:40 481阅读 0赞

1.通过这篇文章来讲讲如何进行全量查询。

2.假设当前ES存在如下数据(两条)。

![20190324175935135.png][]

3.全量查询源码如下：

package com.bas.demo;
    
    import com.bas.util.ESUtil;
    import org.elasticsearch.action.search.SearchResponse;
    import org.elasticsearch.client.transport.TransportClient;
    import org.elasticsearch.index.query.QueryBuilder;
    import org.elasticsearch.index.query.QueryBuilders;
    import org.elasticsearch.search.SearchHit;
    import org.elasticsearch.search.SearchHits;
    
    import java.util.Map;
    
    public class MatchQueryDemo {
        public static void main(String[] args) {
            TransportClient client = ESUtil.getClient();
            //构造查询对象
            QueryBuilder query = QueryBuilders.matchAllQuery();
            //搜索结果存入SearchResponse
            SearchResponse response = client.prepareSearch("app_account")
                    .setQuery(query) //设置查询器
                    .setSize(3)      //一次查询文档数
                    .get();
            SearchHits hits = response.getHits();
            int count = 1;
            for (SearchHit hit : hits) {
                System.out.println("--------------------" + count++);
                System.out.println("source:" + hit.getSourceAsString());
                System.out.println("index:" + hit.getIndex());
                System.out.println("type:" + hit.getType());
                System.out.println("id:" + hit.getId());
                //遍历文档的每个字段
                Map<String, Object> map = hit.getSourceAsMap();
                for (String key : map.keySet()) {
                    System.out.println(key + "=" + map.get(key));
                }
                System.out.println("--------------------\n");
            }
        }
    }

其中，ES工具类位于：[ES6.6.2 使用小结 - ES工具类使用][ES6.6.2 _ - ES]

4.执行MatchQueryDemo.main()，如图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBU3RyaXZlcg_size_16_color_FFFFFF_t_70][]

[20190324175935135.png]: /images/20220228/8271dad405204b00879bcf4312811631.png
[ES6.6.2 _ - ES]: https://blog.csdn.net/BAStriver/article/details/88776887
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBU3RyaXZlcg_size_16_color_FFFFFF_t_70]: /images/20220228/0b5784b16e1a4be5af37c631462da360.png