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分类:
.NET Core
把.NET CORE操作ElasticSearch的常用方法封装成帮助类，包含查询的封装，操作索引相关的封装，删除，更新等等等。基于ES7.12.0，以前早一点版本的写法有些用法都不一样了，重新封装一下。
写了我好久
namespace ElasticsearchLearn.ElasticSearch
{
public static class ElasticsearchExtands
{
/// <summary>
/// 封装后的linq的查询方式
/// </summary>
/// <typeparam name="T">实体泛型</typeparam>
/// <param name="indexName">index的名称</param>
/// <param name="selector">linq内容</param>
/// <returns></returns>
public static async Task<List<T>> SearchByLinqAsync<T>(this IElasticSearchServer elasticSearchServer, string indexName, Func<QueryContainerDescriptor<T>, QueryContainer> selector = null) where T : class
{
var list = await elasticSearchServer.ElasticLinqClient.SearchAsync<T>(option => option.Index(indexName.ToLower()).Query(selector));
return list.Documents.ToList();
}
/// <summary>
/// 封装后的Json的查询方式
/// </summary>
/// <param name="indexName">index的名称</param>
/// <param name="jsonString">json字符串</param>
/// <returns>返回Jobject的内容</returns>
public static async Task<JToken> SearchByJsonAsync(this IElasticSearchServer elasticSearchServer, string indexName, string jsonString)
{
var stringRespones = await elasticSearchServer.ElasticJsonClient.SearchAsync<StringResponse>(indexName.ToLower(), jsonString);
var jobject = JObject.Parse(stringRespones.Body);
var total = Convert.ToInt32(jobject["hits"]["total"]["value"].ToString());
if (total > 0)
{
string json = string.Empty;
var sourceArg = jobject["hits"]["hits"];
foreach (var source in sourceArg)
{
string sourceJson = source["_source"].ToString().Substring(1, source["_source"].ToString().Length - 1);
sourceJson = "{ \"_id\":\"" + source["_id"] + "\"," + sourceJson;
if (json.Length <= 0)
json += sourceJson;
else
json += "," + sourceJson;
}
return JToken.Parse("[" + json + "]");
}
return null;
}
/// <summary>
/// 通过索引与id检查文档是否已经存在
/// </summary>
/// <param name="index">索引</param>
/// <param name="id">id</param>
/// <returns></returns>
public static async Task<bool> SourceExistsAsync(this IElasticSearchServer elasticSearchServer, string index, string id)
{
bool flag = false;
StringResponse resStr = null;
try
{
//elasticSearchServer.ElasticJsonClient.Indices.Exists()
resStr = await elasticSearchServer.ElasticJsonClient.SourceExistsAsync<StringResponse>(index, id);
if (resStr.HttpStatusCode == 200)
{
flag = true;
}
}
catch (Exception ex)
{
}
return flag;
}
/// <summary>
/// 检测索引是否已经存在
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
public static async Task<bool> IsIndexExsit(this IElasticSearchServer elasticSearchServer, string index)
{
bool flag = false;
StringResponse resStr = null;
try
{
resStr = await elasticSearchServer.ElasticJsonClient.Indices.ExistsAsync<StringResponse>(index);
if (resStr.HttpStatusCode == 200)
{
flag = true;
}
}
catch (Exception ex)
{
}
return flag;
}
/// <summary>
/// 创建index
/// </summary>
/// <param name="indexName"></param>
/// <param name="shards">分片数量，即数据块最小单元</param>
/// <returns></returns>
public static async Task<bool> CreateIndexAsync(this IElasticSearchServer elasticSearchServer, string indexName, int shards = 5)
{
var isHaveIndex = await IsIndexExsit(elasticSearchServer, indexName.ToLower());
if (!isHaveIndex)
{
var stringResponse = await elasticSearchServer.ElasticJsonClient.Indices.CreateAsync<StringResponse>(indexName.ToLower(),
PostData.String($"{{\"settings\" : {{\"index\" : {{\"number_of_replicas\" : 0, \"number_of_shards\":\"{shards}\",\"refresh_interval\":\"-1\"}}}}}}"));
var resObj = JObject.Parse(stringResponse.Body);
if ((bool)resObj["acknowledged"])
{
return true;
}
}
else
{
return true;
}
return false;
}
/// <summary>
/// 删除index
/// </summary>
/// <param name="indexName"></param>
/// <returns></returns>
public static async Task<bool> DeleteIndexAsync(this IElasticSearchServer elasticSearchServer, string indexName)
{
var stringRespones = await elasticSearchServer.ElasticJsonClient.Indices.DeleteAsync<StringResponse>(indexName.ToLower());
var resObj = JObject.Parse(stringRespones.Body);
if ((bool)resObj["acknowledged"])
{
return true;
}
return false;
}
/// <summary>
/// 插入单个文档
/// </summary>
/// <param name="indexName">索引名称</param>
/// <param name="objectDocment">文档内容</param>
/// <param name="_id">自定义_id</param>
/// <returns></returns>
public static async Task<bool> InsertDocumentAsync(this IElasticSearchServer elasticSearchServer, string indexName, object objectDocment, string _id = "")
{
var stringRespones = new StringResponse();
if (_id.Length > 0)
stringRespones = await elasticSearchServer.ElasticJsonClient.IndexAsync<StringResponse>(indexName.ToLower(), _id, PostData.String(JsonConvert.SerializeObject(objectDocment)));
else
stringRespones = await elasticSearchServer.ElasticJsonClient.IndexAsync<StringResponse>(indexName.ToLower(), PostData.String(JsonConvert.SerializeObject(objectDocment)));
var resObj = JObject.Parse(stringRespones.Body);
if ((int)resObj["_shards"]["successful"] > 0)
{
return true;
}
return false;
}
/// <summary>
/// 删除单个文档
/// </summary>
/// <param name="indexName">索引名称</param>
/// <param name="_id">要删除的id</param>
/// <returns></returns>
public static async Task<bool> DeleteDocumentAsync(this IElasticSearchServer elasticSearchServer, string indexName, string _id)
{
bool flag = false;
StringResponse resStr = null;
try
{
resStr = await elasticSearchServer.ElasticJsonClient.DeleteAsync<StringResponse>(indexName.ToLower(), _id);
var resObj = JObject.Parse(resStr.Body);
if ((int)resObj["_shards"]["total"] == 0 || (int)resObj["_shards"]["successful"] > 0)
{
flag = true;
}
}
catch (Exception ex)
{
}
return flag;
}
/// <summary>
/// 更新文档
/// </summary>
/// <param name="indexName">索引名称</param>
/// <param name="_id">文档id</param>
/// <param name="objectDocment">文档内容</param>
/// <returns></returns>
public static async Task<bool> UpdateDocumentAsync(this IElasticSearchServer elasticSearchServer, string indexName, string id, object objectDocment)
{
bool flag = false;
try
{
string json = JsonConvert.SerializeObject(objectDocment);
var updateToJson = "{\"doc\":" + json + "}";
var stringRespones = await elasticSearchServer.ElasticJsonClient.UpdateAsync<StringResponse>(indexName, id, PostData.String(updateToJson));
var resObj = JObject.Parse(stringRespones.Body);
if ((int)resObj["_shards"]["successful"] > 0)
{
return true;
}
}
catch { }
return flag;
}
/// <summary>
/// 通过Bulk更新文档
/// </summary>
/// <param name="indexName">索引名称</param>
/// <param name="_id">文档id</param>
/// <param name="objectDocment">文档内容</param>
/// <returns></returns>
public static async Task<bool> UpdateDocumentByBulkAsync(this IElasticSearchServer elasticSearchServer, string indexName, string _id, object objectDocment)
{
bool flag = false;
try
{
string json = JsonConvert.SerializeObject(objectDocment);
if (json.IndexOf("[") == 0)
{
var objectDocmentOne = JToken.Parse(json);
json = JsonConvert.SerializeObject(objectDocmentOne[0]);
}
int idInt = json.IndexOf("\"_id");
if (idInt > 0)
{
string idJson = json.Substring(idInt, json.IndexOf(_id) + _id.Length + 1);
json = json.Replace(idJson, "");
}
List<string> list = new List<string>();
list.Add("{\"update\":{\"_id\":\"" + _id + "\"}}");
list.Add("{\"doc\":" + json + "}");
var stringRespones = await elasticSearchServer.ElasticJsonClient.BulkAsync<StringResponse>(indexName.ToLower(), PostData.MultiJson(list));
var resObj = JObject.Parse(stringRespones.Body);
if (!(bool)resObj["errors"])
{
return true;
}
}
catch { }
return flag;
}
}
}在控制器中测试的代码如下：
namespace ElasticsearchLearn.Controllers
{
public class HomeController : Controller
{
private readonly ILogger<HomeController> _logger;
private readonly IElasticSearchServer _elasticSearchServer;
public HomeController(ILogger<HomeController> logger, IElasticSearchServer elasticSearchServer)
{
_logger = logger;
_elasticSearchServer = elasticSearchServer;
}
public IActionResult Index()
{
return View();
}
/// <summary>
/// 基于Linq的查询
/// </summary>
public async Task<List<Persons>> SearchByLinq(string user = "批量")
{
var list = await _elasticSearchServer.SearchByLinqAsync<Persons>("users", op => op.Match(
ss => ss.Field(
qq => qq.user == user)));
return list;
}
/// <summary>
/// 基于Json的查询
/// </summary>
public async Task<string> SearchByJson(string user = "批量")
{
var jsonobject = new { query = new { match = new { user = "批量" } } };
string json = JsonConvert.SerializeObject(jsonobject);
var jToken = await _elasticSearchServer.SearchByJsonAsync("users", json);
return jToken.ToString();
}
/// <summary>
/// 插入单个文档
/// </summary>
/// <param name="indexName">索引名称</param>
/// <param name="objectDocment">文档内容</param>
/// <param name="_id">自定义_id</param>
/// <returns></returns>
public async Task<bool> InsertDocument()
{
var content = new
{
user = "嘻嘻",
post_date = "2021-10-11T15:00:12",
message = "...."
};
bool result = await _elasticSearchServer.InsertDocumentAsync("users", content, "1");
return result;
}
/// <summary>
/// 删除单个文档
/// </summary>
/// <param name="index"></param>
/// <param name="id"></param>
/// <returns></returns>
public async Task<bool> DeleteDocument(string index = "users", string id = "2")
{
bool result = await _elasticSearchServer.DeleteDocumentAsync(index, id);
return result;
}
/// <summary>
/// 通过Bulk更新文档
/// </summary>
/// <returns></returns>
public async Task<bool> UpdateDocumentByBulk()
{
var content = new
{
user = "嘻嘻2",
post_date = "2021-10-11T15:00:12",
message = "更新一下"
};
bool result = await _elasticSearchServer.UpdateDocumentByBulkAsync("users", "1", content);
return result;
}
/// <summary>
/// 更新文档
/// </summary>
/// <returns></returns>
public async Task<bool> UpdateDocument()
{
var content = new
{
user = "嘻嘻3",
post_date = "2021-10-11T15:00:12",
message = "更新一下333"
};
bool result = await _elasticSearchServer.UpdateDocumentAsync("users", "1", content);
return result;
}
public async Task<bool> SourceExistsAsync(string index = "users", string id = "1")
{
bool result = await _elasticSearchServer.SourceExistsAsync(index, id);
return result;
}
/// <summary>
/// 检测索引是否已经存在
/// </summary>
public async Task<bool> IsIndexExsit(string index = "users")
{
bool result = await _elasticSearchServer.IsIndexExsit(index);
return result;
}
/// <summary>
/// 创建index
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
public async Task<bool> CreateIndex(string index)
{
if (string.IsNullOrWhiteSpace(index))
return false;
bool result = await _elasticSearchServer.CreateIndexAsync(index);
return result;
}
/// <summary>
/// 删除index
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
public async Task<bool> DeleteIndex(string index)
{
if (string.IsNullOrWhiteSpace(index))
return false;
bool result = await _elasticSearchServer.DeleteIndexAsync(index);
return result;
}
}部分效果如下：
其实调用方法的时候我们可以看到执行的原生语句是什么：
贴一下测试用的原生语句：
##添加内容
PUT users/_create/2
{
"user" : "xxx",
"post_date" : "2021-10-11T14:40:12",
"message" : "trying out Elasticsearch"
}
##根据index和id查询文档
GET users/_doc/1
##批量查询
GET /_mget
{
"docs" : [
{
"_index" : "users",
"_id" : "1"
},
{
"_index" : "users",
"_id" : "2"
},
{
"_index" : "users",
"_id" : "3"
}
]
}
##更新文档
POST users/_update/1
{
"doc" : {
"user" : "嘻嘻1"
}
}
##检查index是否存在
HEAD users
在贴一个代码下载地址：https://download.tnblog.net/resource/index/4407008a3846478c8eb0e33e48eff418
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