solr与.net系列课程(五)solrnet的使用
最近因项目比较忙,所以这篇文章出的比较晚,离上一篇文章已经有半个月的时间了,这节课我们来学下一下solr的.net客户端solrnet
出处 https://github.com/mausch/SolrNet
上一篇文章讲述了C#是如何请求和接受solr的数据的,请求链接是自己拼接的,接受数据是使用数据契约,solrnet就是把这些步骤封装起来,大家直接调用方法就可以请求和接受数据
首先要下载solrnet所要使用的DLL
Microsoft.Practices.ServiceLocation.dll
SolrNet.dll
HttpWebAdapters.dll
下载地址 http://pan.baidu.com/s/1pJt7Wr5
创建一个项目,然后引用上面的DLL
好了,下面就开始实战, 我们来设计一个查询条件 title="关键字" and (area="北京" or area="上海") and industry="电力" and columns="项目" order time desc
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(1)创建一个接收数据的实体类,内容如下
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using SolrNet.Attributes; namespace WebApplication5 { public class Article { [SolrUniqueKey("id")] public int id { get; set; } [SolrField("title")] public string title { get; set; } [SolrField("area")] public string area { get; set; } [SolrField("industry")] public string industry { get; set; } [SolrField("body")] public string body { get; set; } [SolrField("adddate")] public DateTime adddate { get; set; } [SolrField("columns")] public string columns { get; set; } [SolrField("sorts")] public string sorts { get; set; } [SolrField("url")] public string url { get; set; } [SolrField("orderColumn")] public string orderColumn { get; set; } } }SolrUniqueKey对应solr的唯一键,SolrField对应接收的字段
(2) 创建Global.asax加入如下代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security; using System.Web.SessionState; using SolrNet; namespace WebApplication5 { public class Global : System.Web.HttpApplication { protected void Application_Start(object sender, EventArgs e) { Startup.Init<Article>("http://192.168.0.14:8080/solr/collection1"); } protected void Session_Start(object sender, EventArgs e) { } protected void Application_BeginRequest(object sender, EventArgs e) { } protected void Application_AuthenticateRequest(object sender, EventArgs e) { } protected void Application_Error(object sender, EventArgs e) { } protected void Session_End(object sender, EventArgs e) { } protected void Application_End(object sender, EventArgs e) { } } }引用using SolrNet;
Startup.Init<Article>("http://192.168.0.14:8080/solr/collection1"); 请求solr服务器的地址
(3)我们开始使用solrnet,创建一个aspx页面,先看代码在然后再解释每个方法的含义
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI; using System.Web.UI.WebControls; using SolrNet; using SolrNet.Commands.Parameters; using System.Text; using System.Data; using System.Text.RegularExpressions; using Microsoft.Practices.ServiceLocation; namespace WebApplication5 { public partial class _Default : System.Web.UI.Page { public DataTable Result = new DataTable(); public int total; public int maxNum; public int pageNum = 36; protected void Page_Load(object sender, EventArgs e) { Search("上海", "北京,上海", "电力", "项目", 1, "0"); } public void Search(string keyword, string area, string industry, string columns, int start, string time) { //定义solr ISolrOperations<Article> solr = ServiceLocator.Current.GetInstance<ISolrOperations<Article>>(); //建立排序，条件. QueryOptions options = new QueryOptions(); options.Rows = pageNum;//数据条数 options.Start = start;//开始项 //创建查询条件 var qTB = new SolrQueryByField("title", keyword); //创建条件集合 List<ISolrQuery> query = new List<ISolrQuery>(); //添加条件 query.Add(qTB); //查询地区,多个地区,这里用 ,号隔开,例 北京,上海,杭州 if (area != "") { //创建集合存存储地区 List<ISolrQuery> ar = new List<ISolrQuery>(); string[] ares = area.Split(new char[] { ',' }); foreach (string a in ares) { //存储地区 ar.Add(new SolrQueryByField("area", a)); } //创建地区之间的关系,是OR还是AND var qArea = new SolrMultipleCriteriaQuery(ar, "OR"); //添加至条件集合 query.Add(qArea); } //行业条件,与地区一样 if (industry != "") { List<ISolrQuery> ind = new List<ISolrQuery>(); string[] industs = industry.Split(new char[] { ',' }); foreach (string a in industs) { ind.Add(new SolrQueryByField("industry", a)); } var qIndustry = new SolrMultipleCriteriaQuery(ind, "OR"); query.Add(qIndustry); } //栏目条件同上 if (columns != "") { List<ISolrQuery> colm = new List<ISolrQuery>(); string[] cols = columns.Split(new char[] { ',' }); foreach (string a in cols) { colm.Add(new SolrQueryByField("columns", a)); } var qColumns = new SolrMultipleCriteriaQuery(colm, "OR"); query.Add(qColumns); } //创建时间范围实例 SolrQueryByRange<DateTime> qDateRange = null; //七天内数据 if (time == "-7") { //后两个参数,一个是开始时间,一个是结束时时间 qDateRange = new SolrQueryByRange<DateTime>("adddate", DateTime.Now.AddDays(int.Parse(time)), DateTime.MaxValue); } else if (time == "0")//所有数据 { qDateRange = new SolrQueryByRange<DateTime>("adddate", DateTime.MinValue, DateTime.MaxValue); } else//其他 { qDateRange = new SolrQueryByRange<DateTime>("adddate", DateTime.Today.AddMonths(int.Parse(time)), DateTime.MaxValue); } //加入集合 query.Add(qDateRange); //按照时间倒排序. options.AddOrder(new SolrNet.SortOrder("adddate", Order.DESC)); //条件集合之间的关系 var qTBO = new SolrMultipleCriteriaQuery(query, "AND"); //执行查询,有5个重载 SolrQueryResults<Article> results = solr.Query(qTBO, options); this.total = results.NumFound; maxNum = total / pageNum + 1; //Response.Write(t.Count); Result.Columns.Add("id", typeof(string)); Result.Columns.Add("title", typeof(string)); Result.Columns.Add("columns", typeof(string)); Result.Columns.Add("orderColumn", typeof(string)); Result.Columns.Add("area", typeof(string)); Result.Columns.Add("industry", typeof(string)); //Result.Columns.Add("body", typeof(string)); Result.Columns.Add("addDate", typeof(string)); Result.Columns.Add("url", typeof(string)); foreach (Article article in results) { string id = article.id.ToString(); string title = article.title; string orderColumn = article.orderColumn; string url = ""; DataRow row = this.Result.NewRow(); row["id"] = id; row["title"] = title; row["orderColumn"] = article.orderColumn; row["area"] = article.area; row["