Elasticsearch_条件查询QueryBuilder
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1 查询所有（matchAllQuery）
1）源代码
@Test
publicvoid matchAllQuery() {
// 1 执行查询
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.matchAllQuery()).get();
// 2 打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数，查询结果有多少对象
System.out.println("查询结果有：" + hits.getTotalHits() + "条");
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3 关闭连接
client.close();
} |
2 对所有字段分词查询（queryStringQuery）
1）源代码
@Test
publicvoid query() {
// 1 条件查询
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.queryStringQuery("全文")).get();
// 2 打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数，查询结果有多少对象
System.out.println("查询结果有：" + hits.getTotalHits() + "条");
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3 关闭连接
client.close();
} |
3 通配符查询（wildcardQuery）
*：表示多个字符（任意的字符）
？：表示单个字符
1）源代码
@Test
publicvoid wildcardQuery() {
// 1 通配符查询
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.wildcardQuery("content", "*全*")).get();
// 2 打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数，查询结果有多少对象
System.out.println("查询结果有：" + hits.getTotalHits() + "条");
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3 关闭连接
client.close();
} |
4 词条查询（TermQuery）
1）源代码
@Test
publicvoid termQuery() {
// 1 第一field查询
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.termQuery("content", "全")).get();
// 2 打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数，查询结果有多少对象
System.out.println("查询结果有：" + hits.getTotalHits() + "条");
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3 关闭连接
client.close();
} |
5 模糊查询（fuzzy）
@Test
publicvoid fuzzy() {
// 1 模糊查询
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.fuzzyQuery("title", "lucene")).get();
// 2 打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数，查询结果有多少对象
System.out.println("查询结果有：" + hits.getTotalHits() + "条");
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3 关闭连接
client.close();
} |
6 映射相关操作
1）源代码
@Test
public void createMapping() throws Exception {
// 1设置mapping
XContentBuilder builder = XContentFactory.jsonBuilder()
.startObject()
.startObject("article")
.startObject("properties")
.startObject("id1")
.field("type", "string")
.field("store", "yes")
.endObject()
.startObject("title2")
.field("type", "string")
.field("store", "no")
.endObject()
.startObject("content")
.field("type", "string")
.field("store", "yes")
.endObject()
.endObject()
.endObject()
.endObject();
// 2 添加mapping
PutMappingRequest mapping = Requests.putMappingRequest("blog4").type("article").source(builder);
client.admin().indices().putMapping(mapping).get();
// 3 关闭资源
client.close();
} |
