通过Http接口及SolrNet 两种方法基于Solr5.5.1 实现CURD

前言

老规矩，任何技术的入门我通常都会总结增删改查，本文我就通过HttpWebRequest和SolrNet的方式实现Solr最基础的增删改查(CURD)。对于自己的完整项目，同时不想过于依赖第三方类库的则通过Http接口的方式来调用Solr。 当然也有人喜欢调用第三方的类库，简单方便，不需要自己处理太多繁琐的细节就可以轻松调用solr来实现自己的业务逻辑。

Http接口实现

private static void Query()
        {

            string url = "http://localhost:8080/solr/univeral/select?indent=on&q=title:魔兽&wt=json";

            WebRequest request = WebRequest.Create(url);
            request.Method = "GET";
            WebResponse response = request.GetResponse();

            Stream stream = response.GetResponseStream();
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                string strJson = reader.ReadToEnd();
                Console.WriteLine(strJson);
            }
        }

        private static void Index()
        {
            string url = "http://localhost:8080/solr/univeral/update?_=1466592530544&wt=json&commit=true";

            string strData = @"<add>
                <doc>
                    <field name=‘id‘>2</field>
                    <field name=‘title‘>平凡的世界（根据路遥同名小说改变）</field>
                    <field name=‘author‘>路遥</field>
                </doc>
            </add>";

            byte[] bytes;
            bytes = System.Text.Encoding.UTF8.GetBytes(strData);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.Accept = "*/*";
            request.ContentLength = bytes.Length;
            request.ContentType = "text/xml; encoding=‘utf-8‘";

            Stream requestStream = request.GetRequestStream();
            requestStream.Write(bytes,0,bytes.Length);
            requestStream.Close();

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                Stream responseStream = response.GetResponseStream();
                string strJson = new StreamReader(responseStream).ReadToEnd();
                Console.WriteLine(strJson);
            }

        }

        private static void Delete()
        {
            string url = "http://localhost:8080/solr/univeral/update?_=1466592530544&wt=json&commit=true";

            string strData = @"<delete><id>2</id></delete>";

            byte[] bytes;
            bytes = System.Text.Encoding.ASCII.GetBytes(strData);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.Accept = "*/*";
            request.ContentLength = bytes.Length;
            request.ContentType = "text/xml; encoding=‘utf-8‘";

            Stream requestStream = request.GetRequestStream();
            requestStream.Write(bytes, 0, bytes.Length);
            requestStream.Close();

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                Stream responseStream = response.GetResponseStream();
                string strJson = new StreamReader(responseStream).ReadToEnd();
                Console.WriteLine(strJson);
            }

        }

SolrNet实现

SolrNet最大的优势就是一直在更新，用户众多，并且在github上提供源代码（https://github.com/mausch/SolrNet）和说明文档（https://github.com/mausch/SolrNet/tree/master/Documentation）。

使用前先创建对应的model，字段和schema.xml中的字段对应，并使用属性SolrUniqueKey和SolrField标识主见和普通字段。

public class Book1
{
        [SolrUniqueKey("id")]
        public int Id { get; set; }
        [SolrField("title")]
        public string Title { get; set; }
        [SolrField("author")]
        public string Author { get; set; }

 }

主程序调用前先初始化：Startup.Init<Book1>("http://localhost:8080/solr/univeral/");  OK， 可以实现增删改查了。

private static void Delete()
        {
            ISolrOperations<Book1> solr = ServiceLocator.Current.GetInstance<ISolrOperations<Book1>>();

            Book1 b=new Book1();
            b.Id =2;

            solr.Delete(b);
            solr.Commit();
        }

        private static void Index()
        {
            ISolrOperations<Book1> solr = ServiceLocator.Current.GetInstance<ISolrOperations<Book1>>();

            Book1 b = new Book1();
            b.Id = 2;
            b.Title = "平凡的世界";
            b.Author = "路遥";

            solr.Add(b);

            Book1 b1 = new Book1();
            b1.Id = 3;
            b1.Title = "围城";
            b1.Author = "钱钟书";

            solr.Add(b1);

            Book1 b2 = new Book1();
            b2.Id = 4;
            b2.Title = "我要去打魔兽啊";
            b2.Author = "张剑";

            solr.Add(b2);

            Book1 b3 = new Book1();
            b3.Id = 5;
            b3.Title = "魔兽世界";
            b3.Author = "张三";

            solr.Add(b3);

            solr.Commit();
        }

        private static void Query()
        {
            ISolrOperations<Book1> solr = ServiceLocator.Current.GetInstance<ISolrOperations<Book1>>();

            SolrQueryResults<Book1> solrResults = solr.Query(new SolrQuery("title:魔兽"));

            foreach (var solrQueryResult in solrResults)
            {
                Console.WriteLine("Id:" + solrQueryResult.Id+",Name:"+solrQueryResult.Title+",Author:"+solrQueryResult.Author);
            }
            Console.ReadLine();
        }

SolrNet提供了SolrQuery的多个版本有兴趣的话可以看看它的源码，包括容器如何初始化，容器内部如何使用SolrConnection。也是一个不错的框架，值得推荐。

是否索引(indexed)、是否存储(stored)

你在配置schema.xml时注意到field的这几个字段了么？ 我第一次配置时并没有关注这几个属性，只是觉的有些好奇，都是什么情况下需要设置这几个属性呢？这才专门查了它们几个之间的区别：

• indexed=true  stored=true 需要用关键查询并需要在查询结果中显示。 如book.title、book.author

• indexed=false stored=true 不需要用关键字查询，但需要在查询结果中显示。 如book.destinationUrl

• indexed=true stored=false  需要用关键字查询但不需要在查询结果中显示。

参考资料

http://www.cnblogs.com/zhangweizhong/p/5073997.html