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ES源代码中对matchPhrasePrefixQuery的描述如下所示:
- /**
- * Creates a match query with type "PHRASE_PREFIX" for the provided field name and text.
- *
- * @param name The field name.
- * @param text The query text (to be analyzed).
- */
- public static MatchQueryBuilder matchPhrasePrefixQuery(String name, Object text) {
- return new MatchQueryBuilder(name, text).type(MatchQueryBuilder.Type.PHRASE_PREFIX);
- }
如果你调用matchPhrasePrefixQuery时,text为中文,那么,很大可能是一种状况:你会发现,matchPhraseQuery和matchPhrasePrefixQuery没有任何差别。而当text为英文时,差别就显现出来了:matchPhraseQuery的text是一个英文单词,而matchPhrasePrefixQuery的text则无这一约束,你可以从一个英文单词中抽几个连接在一起的字母进行查询。
示例代码如下所示:
- /**
- * @author Geloin
- */
- package com.gsoft.gsearch.util;
- import java.util.UUID;
- import junit.framework.Assert;
- import org.elasticsearch.action.bulk.BulkRequestBuilder;
- import org.elasticsearch.action.bulk.BulkResponse;
- import org.elasticsearch.action.index.IndexRequest;
- import org.elasticsearch.action.search.SearchResponse;
- import org.elasticsearch.index.query.QueryBuilder;
- import org.elasticsearch.index.query.QueryBuilders;
- import org.elasticsearch.search.SearchHit;
- import org.elasticsearch.search.SearchHits;
- import org.junit.Test;
- import com.gsoft.gsearch.BaseTest;
- import com.gsoft.gsearch.entity.Person;
- /**
- * 以短语形式查询,查询时关键字不会被分词,而是直接以一个字符串的形式查询
- *
- * @author Geloin
- *
- */
- public class MatchPhrasePrefixQueryTest extends BaseTest {
- @Test
- public void matchPhrasePrefixQuery() {
- try {
- // 创建索引
- BulkRequestBuilder builder = client.prepareBulk();
- for (int i = 0; i < 2; i++) {
- Person p = new Person();
- p.setId(UUID.randomUUID().toString());
- p.setAge(20);
- p.setIsStudent(false);
- p.setSex("男");
- p.setName("Zhangsan wang");
- String source = ElasticSearchUtil.BeanToJson(p);
- IndexRequest request = client.prepareIndex().setIndex(index)
- .setType(type).setId(p.getId()).setSource(source)
- .request();
- builder.add(request);
- }
- BulkResponse bResponse = builder.execute().actionGet();
- if (bResponse.hasFailures()) {
- Assert.fail("创建索引出错!");
- }
- // 检索
- QueryBuilder qb = QueryBuilders.matchPhraseQuery("name", "wa");
- SearchResponse searchResponse = client.prepareSearch(index)
- .setTypes(type).setQuery(qb).setFrom(0).setSize(12)
- .execute().actionGet();
- SearchHits hits = searchResponse.getHits();
- if (null == hits || hits.totalHits() == 0) {
- log.error("使用matchPhraseQuery(\"name\", \"<span style="font-size:14px;">wa</span>\")没有查询到任何结果!");
- } else {
- for (SearchHit hit : hits) {
- String json = hit.getSourceAsString();
- Person newPerson = mapper.readValue(json, Person.class);
- System.out.println("name\t\t" + newPerson.getName());
- System.out.println("sex\t\t" + newPerson.getSex());
- System.out.println("age\t\t" + newPerson.getAge());
- System.out.println("isStudent\t\t"
- + newPerson.getIsStudent());
- }
- }
- System.out.println("===================================================");
- // 检索
- QueryBuilder qb1 = QueryBuilders.matchPhrasePrefixQuery("name", "wa");
- SearchResponse searchResponse1 = client.prepareSearch(index)
- .setTypes(type).setQuery(qb1).setFrom(0).setSize(20)
- .execute().actionGet();
- SearchHits hits1 = searchResponse1.getHits();
- if (null == hits1 || hits1.totalHits() == 0) {
- log.error("使用matchPhrasePrefixQuery(\"name\", \"wa\")没有查询到任何结果!");
- return;
- } else {
- for (SearchHit hit : hits1) {
- String json = hit.getSourceAsString();
- Person newPerson = mapper.readValue(json, Person.class);
- System.out.println("name\t\t" + newPerson.getName());
- System.out.println("sex\t\t" + newPerson.getSex());
- System.out.println("age\t\t" + newPerson.getAge());
- System.out.println("isStudent\t\t"
- + newPerson.getIsStudent());
- }
- }
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- if (null != client) {
- client.close();
- }
- if (null != node) {
- node.close();
- }
- }
- }
- }
你会发现,使用matchPhraseQuery并未查询出结果,而matchPhrasePrefixQuery查询出的,则是我们需要的结果。
http://blog.csdn.net/geloin/article/details/8939387