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专栏/ElasticSearch知识体系详解/20WrapperQuery.md

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+                            
+                            因收到Google相关通知，网站将会择期关闭。相关通知内容
+                            
+                            
+                            20 WrapperQuery
+                            实现方式理论基础
+
+
+Wrapper Query 官网说明
+
+
+https://www.elastic.co/guide/en/elasticsearch/reference/6.4/query-dsl-wrapper-query.html
+
+
+This query is more useful in the context of the Java high-level REST client or transport client to also accept queries as json formatted string. In these cases queries can be specified as a json or yaml formatted string or as a query builder (which is a available in the Java high-level REST client).
+
+
+GET /_search
+{
+    "query" : {
+        "wrapper": {
+            "query" : "eyJ0ZXJtIiA6IHsgInVzZXIiIDogIktpbWNoeSIgfX0=" // Base64 encoded string: {"term" : { "user" : "Kimchy" }}
+        }
+    }
+}
+
+
+
+将DSL JSON语句 转成 map
+
+
+https://blog.csdn.net/qq_41370896/article/details/83658948
+
+String dsl = "";
+Map maps = (Map)JSON.parse(dsl);  
+maps.get("query");// dsl query string
+
+
+
+Java 代码
+
+
+https://blog.csdn.net/tcyzhyx/article/details/84566734
+
+https://www.jianshu.com/p/216ca70d9e62
+
+StringBuffer dsl = new StringBuffer();
+dsl.append("{\"bool\": {");
+dsl.append("      \"must\": [");
+dsl.append("        {");
+dsl.append("          \"term\": {");
+dsl.append("            \"mdid.keyword\": {");
+dsl.append("              \"value\": \"2fa9d41e1af460e0d47ce36ca8a98737\"");
+dsl.append("            }");
+dsl.append("          }");
+dsl.append("        }");
+dsl.append("      ]");
+dsl.append("    }");
+dsl.append("}");
+WrapperQueryBuilder wqb = QueryBuilders.wrapperQuery(dsl.toString());
+SearchResponse searchResponse = client.prepareSearch(basicsysCodeManager.getYjzxYjxxIndex())
+.setTypes(basicsysCodeManager.getYjzxYjxxType()).setQuery(wqb).setSize(10).get();
+SearchHit[] hits = searchResponse.getHits().getHits();
+for(SearchHit hit : hits){
+	String content = hit.getSourceAsString();
+	System.out.println(content);
+}
+
+
+
+query + agg 应该怎么写
+
+
+http://www.itkeyword.com/doc/1009692843717298639/wrapperquerybuilder-aggs-query-throwing-query-malformed-exception
+
+"{\"query\":{\"match_all\": {}},\"aggs\":{\"avg1\":{\"avg\":{\"field\":\"age\"}}}}"
+SearchSourceBuilder ssb = new SearchSourceBuilder();
+
+// add the query part
+String query ="{\"match_all\": {}}";
+WrapperQueryBuilder wrapQB = new WrapperQueryBuilder(query);
+ssb.query(wrapQB);
+
+// add the aggregation part
+AvgBuilder avgAgg = AggregationBuilders.avg("avg1").field("age");
+ssb.aggregation(avgAgg);
+
+
+实现示例
+
+略
+
+                        
+                        
+