Elasticsearch.Net使用入門教程（1）

本文執行個體為大家分享了Elasticsearch.Net使用教程，供大家參考，具體內容如下

首先去官網下載Elasticsearch 2.3.4安裝包,解壓後，在cmd命令列進入安裝目錄，再進入 bin目錄，運行elasticsearch.bat命令。

elasticsearch外掛程式elasticsearch-head安裝：

bin目錄下執行命令plugin -install mobz/elasticsearch-head

然後開始.net編程,構建控制台應用程式

Program.cs代碼如下:

class Program  {   static void Main(string[] args)   {    Console.WriteLine("*Program 開始運行 : " + DateTime.Now);    var business = new Business();      var swRead = new Stopwatch();    //swRead.Start();    //business.AddToDb();//sqlserver資料庫增加資料    //swRead.Stop();    //Console.WriteLine("DB 寫入時間 : " + swRead.ElapsedMilliseconds);      //swRead.Reset();    //swRead.Start();    //business.AddToElasticIndex();    //swRead.Stop();    //Console.WriteLine("ES 寫入時間 : " + swRead.ElapsedMilliseconds);         var sw = new Stopwatch();    sw.Start();    var personsFromDB = business.GetFromDB();    sw.Stop();    Console.WriteLine("DB 讀時間 : " + sw.ElapsedMilliseconds);         sw.Reset();    sw.Start();    var personsFromEs = business.GetFromES();    sw.Stop();    Console.WriteLine("ES 讀時間 : " + sw.ElapsedMilliseconds);      Console.ReadLine();   }  }

BLL層的Business.cs類:

public class Business  {   private List<PersonDetail> _personList = new List<PersonDetail>();       //SQLSERVER資料庫   PersonDbProvider dbProvider = new PersonDbProvider();     //Elasticsearch   ESProvider esProvider = new ESProvider();     public void AddToDb()   {    _personList = Util.Get10000PersonDetails();//輔助類,產生10000條資料      foreach (var personDetail in _personList)    {     dbProvider.AddPerson(personDetail);    }   }     public void AddToElasticIndex()   {    _personList = Util.Get10000PersonDetailsWithID();    foreach (var personDetail in _personList)    {     esProvider.Index(personDetail);    }   }     public List<PersonDetail> GetFromDB()   {    return dbProvider.GetAllPersonDetails();   }     public List<PersonDetail> GetFromES()   {    return esProvider.GetAll();   }    }

PersonDbProvider.cs和ElasticsearchProvider.cs以及Util.cs,Setting.cs類:

public class PersonDbProvider  {   public bool AddPerson(PersonDetail personDetail)   {    try   { //資料庫上下文     using (var db = new PersonContext())     {      db.PersonDetails.Add(personDetail);      db.SaveChanges();      return true;     }    }    catch (Exception)    {     return false;    }   }     public List<PersonDetail> GetAllPersonDetails()   {    try   {     using (var db = new PersonContext())     {      return db.PersonDetails.ToList();     }    }    catch (Exception)    {     return null;    }   }  }

public class ESProvider  {   public static ElasticClient client = new ElasticClient(Setting.ConnectionSettings);     public bool Index(PersonDetail person)   {    var client = new ElasticClient(Setting.ConnectionSettings);    try   {     //添加資料     //在調用下面的index方法的時候，如果沒有指定使用哪個index，Elasticsearch會直接使用我們在setting中的defaultIndex，如果沒有，則會自動建立     var index = client.Index(person);     return index.Created;    }    catch (Exception ex)    {     Console.WriteLine(" Excepton Message : " + ex.Message);    }    return false;   }       public List<PersonDetail> GetAll()   {    var searchResults = client.Search<PersonDetail>(s => s     .From(0)     .Size(10000)     );    return searchResults.Documents.ToList();   }     public List<PersonDetail> GetEntities(string keyword)   {    var client = new ElasticClient(Setting.ConnectionSettings);      #region 全文檢索搜尋      keyword = String.Format("*{0}*", keyword);    //預設的Operator是Or,當keyword是類似於"One Two"之類的中間有空格的時候，會被當成兩個關鍵詞搜尋，然後搜尋結果進行or運算    //所以我們需要根據需求來調整Operator    var searchResults = client.Search<PersonDetail>(s => s     .Index("elastic-search-app")     .Query(q => q.QueryString(qs => qs.Query(keyword).DefaultOperator(Operator.And)))     );      //--------------------------------------------------------------------------------------    //另外由於ES是分詞搜尋，所以當我們要用"One"來搜尋完整的單詞"JustOne"的時候，就必須在"One"外面添加**，類似於SQL裡面的%keyword%，但是這樣的做法會導致在用完整的單詞來搜尋的時候搜尋不到結果，所以我們需要使用下面的方式      //wholeKeyword = keyword;    //keyword = String.Format("*{0}*", keyword);    //QueryContainer query = new QueryStringQuery() { Query = keyword, DefaultOperator = Operator.And };    //if (!String.IsNullOrEmpty(wholeKeyword))    //{    // QueryContainer wholeWordQuery = new QueryStringQuery() { Query = wholeKeyword };    // query = query || wholeWordQuery;    //}    //var searchResults = client.Search<Person>(s => s    // .Index("zhixiao-application")    // .Query(query)    //);      #endregion      #region 指定屬性搜尋      //使用term Query    //Term是一個被索引的精確值，也就是說Foo, foo, FOO是不相等的，因此    //在使用term query的時候要注意，term query在搜尋的Field已經被索引的時候，是不支援大寫的。    // QueryContainer query2 = new TermQuery { Field = item.Key, Value = item.Value.ToLower() };    //--------------------------------------------------------------------------------------    //var searchResults = client.Search<PersonDetail>(s => s    // .Index("elastic-search-app")    // .Query(q => q.Term(t => t.OnField(f => f.LastName == "keyword")))    //);    //效果同上    //QueryContainer termQuery = new TermQuery { Field = "lastname", Value = "keyword" };    //var searchResults = client.Search<PersonDetail>(s => s    // .Index("elastic-search-app")    // .Query(termQuery)    //);    //--------------------------------------------------------------------------------------    //使用 Query String query    //QueryString query一般用於全文檢索搜尋，但是也可以用於單個屬性的搜尋（設定DefaultField屬性），queryString query可以不區分大小寫。QueryString還有一個好處就是我們可以搜尋一個term中的一部分，    //例如lastname為"t Boterhuis 1"，那麼我們可以用"terhuis"搜尋到這個資料（雖然需要在外麵包上**），在term query裡面就做不到，因為ES把每一個屬性的值都分析成一個個單獨的term，提高了搜尋的效率。    //keyword = "t Boterhuis 2";    //QueryContainer wholeWordQuery = new QueryStringQuery() { Query = keyword, DefaultOperator = Operator.And };    //var searchResults = client.Search<PersonDetail>(s => s    // .Index("elastic-search-app")    // .Query(wholeWordQuery)    //);      #endregion      return searchResults.Documents.ToList();   }     public List<PersonDetail> Sort(string keyword)   {    // 首先我們把原先的索引先刪除了    var response =     client.DeleteIndex(      new DeleteIndexRequest(new IndexNameMarker()      {       Name = "elastic-search-app",       Type = typeof(PersonDetail)      }));      //然後重新建立索引    var indexResult = client.CreateIndex("PD-application");    var response1 = client.Map<PersonDetail>(m => m.MapFromAttributes());    IEnumerable<PersonDetail> persons = new List<PersonDetail>    {     new PersonDetail()     {      Id = 4,      FirstName = "Boterhuis-040",      LastName = "Gusto-040",     },     new PersonDetail()     {      Id = 5,      FirstName = "sales@historichousehotels.com",      LastName = "t Boterhuis 1",     },     new PersonDetail()     {      Id = 6,      FirstName = "Aberdeen #110",      LastName = "sales@historichousehotels.com",     },     new PersonDetail()     {      Id = 7,      FirstName = "Aberdeen #110",      LastName = "t Boterhuis 2",     },    };    foreach (var person in persons)    {     client.Index(person);    }    var searchResults = client.Search<PersonDetail>(s => s     .Index("PD-application")     .Sort(sort => sort.OnField(f => f.Id).Order(SortOrder.Ascending))      );    return searchResults.Documents.ToList();   }  }

public static class Util  {     //產生10000條sqlserver測試資料   public static List<PersonDetail> Get10000PersonDetails()   {    var personDetailsList = new List<PersonDetail>();         for (int i = 0; i < 10000; i++)    {     personDetailsList.Add(new PersonDetail()     {      FirstName = "FN" + new Random().Next(int.MaxValue),      LastName = "LN" + new Random().Next(int.MaxValue)     });    }    return personDetailsList;   }     //產生10000條Elasticsearch測試資料   public static List<PersonDetail> Get10000PersonDetailsWithID()   {    var personDetailsList = new List<PersonDetail>();         for (int i = 0; i < 10000; i++)    {     personDetailsList.Add(new PersonDetail()     {      Id = i * new Random().Next(99),      FirstName = "FN" + new Random().Next(int.MaxValue),      LastName = "LN" + new Random().Next(int.MaxValue)     });    }    return personDetailsList;   }    }

public static class Setting  {   public static Uri Node   {    get   {     return new Uri("http://localhost:9200");    }   }   //串連配置   public static ConnectionSettings ConnectionSettings   {    get   {     return new ConnectionSettings(Node, defaultIndex: "es-index-app");    }   }    }

Model層代碼:

public partial class PersonDetail  {   public long Id { get; set; }   public string FirstName { get; set; }   public string LastName { get; set; }  }

public partial class PersonContext : DbContext  {   static PersonContext()   {    Database.SetInitializer<PersonContext>(null);   }     public PersonContext()    : base("Name=PersonContext")   {   }     public DbSet<PersonDetail> PersonDetails { get; set; }     protected override void OnModelCreating(DbModelBuilder modelBuilder)   {    //在重寫OnModelCreating方法中則可以直接調用映射類，從而減少了OnModelCreating方法的複雜度，同時也增強了代碼維護的可讀性    modelBuilder.Configurations.Add(new PersonDetailMap()); //屬性對應約定   }  }

//Fluent API配置Configuration映射類  public class PersonDetailMap : EntityTypeConfiguration<PersonDetail>  {   public PersonDetailMap()   {    // 主鍵    this.HasKey(t => new { t.Id, t.FirstName, t.LastName });      // 屬性    this.Property(t => t.Id)     .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);      this.Property(t => t.FirstName)     .IsRequired();      this.Property(t => t.LastName)     .IsRequired();      // 表 & 列 映射    this.ToTable("PersonDetails");    this.Property(t => t.Id).HasColumnName("Id");    this.Property(t => t.FirstName).HasColumnName("FirstName");    this.Property(t => t.LastName).HasColumnName("LastName");   }  }

sqlserver指令碼:

USE [Person] GO   SET ANSI_NULLS ONGO   SET QUOTED_IDENTIFIER ONGO   CREATE TABLE [dbo].[PersonDetails](  [Id] [bigint] IDENTITY(1,1) NOT NULL,  [FirstName] [nvarchar](max) NOT NULL,  [LastName] [nvarchar](max) NOT NULL) ON [PRIMARY]   GO

結果圖:

以上就是本文的全部內容，希望對大家的學習有所協助，也希望大家多多支援topic.alibabacloud.com。

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