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

前言