学步园

在上一篇文章中已经学了SolrJ的增删改。本篇来学习下查询的一些实例

(还未了解SolrJ 增删改的可以查看以上博文：http://blog.csdn.net/weijonathan/article/details/16963437)

1、查询排序

public static void solrOrder() throws SolrServerException {
		solrCore = new HttpSolrServer(url);
		SolrQuery query = new SolrQuery();
		query.setQuery("*:*");
		query.addSortField("id", SolrQuery.ORDER.asc);
		QueryResponse rsp = solrCore.query(query);
		List<App> beans = rsp.getBeans(App.class);
		for (int i = 0; i < beans.size(); i++) {
			System.out.println(beans.get(i).getName());
		}
	}

使用addSortField可将查询出来的结果按照你指定的字段进行排序

2、模糊查询

public static void likeQuery() throws SolrServerException {
		solrCore = new HttpSolrServer(url);
		SolrQuery query = new SolrQuery();
		query.setQuery("name:*天天*");
		QueryResponse rsp = solrCore.query(query);
		List<App> beans = rsp.getBeans(App.class);
		for (int i = 0; i < beans.size(); i++) {
			System.out.println(beans.get(i).getName());
		}
	}

模糊查询其实很简单，因为solr本身就支持正则查询，所以通过setQuery指定你要查询的字段，以及要做模糊查询的值就搞定了！

3、分页查询

public static void pageQuery() throws SolrServerException {
		solrCore = new HttpSolrServer(url);
		SolrQuery query = new SolrQuery();
		query.setQuery("name:*天天*");
		query.setStart(0);
		query.setRows(10);
		QueryResponse rsp = solrCore.query(query);
		List<App> beans = rsp.getBeans(App.class);
		for (int i = 0; i < beans.size(); i++) {
			System.out.println(beans.get(i).getName());
		}
	}

这里用到了setStart以及setRows方法进行分页

4、多条件 ||(或)的情况

public static void multipleQuery1() throws SolrServerException {
		solrCore = new HttpSolrServer(url);
		SolrQuery query = new SolrQuery();
		query.setQuery("artist:*Tencent* name:*天天*");// 多条件使用空格分隔
		query.setFields("name", "id_in_appstore", "artist");
		QueryResponse rsp = solrCore.query(query);
		List<App> beans = rsp.getBeans(App.class);
		for (int i = 0; i < beans.size(); i++) {
			System.out.println(beans.get(i).getName());
			System.out.println(beans.get(i).getArtist());
			System.out.println(beans.get(i).getId_in_appstore());
		}
	}

在setQuery中设置多个查询条件，多个查询条件中间用空格隔开就ok

5、多条件& (且)的情况：

public static void multipleQuery2() throws SolrServerException {
		solrCore = new HttpSolrServer(url);
		SolrQuery query = new SolrQuery();
		query.setQuery("name:*天天*");// 多条件使用空格分隔
		query.setFilterQueries("artist:*Tencent*");
		query.setFields("name", "id_in_appstore", "artist");
		QueryResponse rsp = solrCore.query(query);
		List<App> beans = rsp.getBeans(App.class);
		for (int i = 0; i < beans.size(); i++) {
			System.out.println(beans.get(i).getName());
			System.out.println(beans.get(i).getArtist());
			System.out.println(beans.get(i).getId_in_appstore());
		}
	}

name包含"天天"且artist包含“Tencent”

对于普通的查询，以上这些查询已经足够了！但是对于复杂的查询当然光靠这些是远远不够的。

后面会有博文介绍更加复杂的查询。