go es

安装go package：

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1	go get github.com/olivere/elastic

 

开撸：

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/** * es demo * author：JetWu * date：2020.06.10  */ package es   import (     "context"     "errors"     "fmt"     "log"     "reflect"       "encoding/json"       "github.com/olivere/elastic" )   type Student struct {     Name         string   `json:"name"`     Age          int      `json:"age"`     City         string   `json:"city"`     Interests    []string `json:"interests"`     Introduction string   `json:"introduction"` }   var client *elastic.Client var host = "http://127.0.0.1:9200/"   /** * 连接es  */ func init() {     log.Println("Connecting to elasticsearch server...")     //连接es     var err error     client, err = elastic.NewSimpleClient(elastic.SetURL(host))     if err != nil {         log.Println("Connected failed: ", err)         return     }     log.Println("Connected succeed!")     //测试es连接     info, _, err := client.Ping(host).Do(context.Background())     if err != nil {         log.Println("Ping elasticsearch server failed: ", err)         return     }     log.Println("elasticsearch version: ", info.Version.Number) }   /** * 打印查询语句  */ func PrintQuery(src interface{}) {     data, err := json.MarshalIndent(src, "", "")     if err != nil {         log.Println("PrintQuery Error: ", err)         return     }     fmt.Println("PrintQuery:\n", string(data)) }   /** * 搜索  */ func Search(keyword string) []*Student {     queryStr := `{         "bool": {             "should": [                 {                     "match": {"name":"%s"}                 },                 {                     "match": {"city":"%s"}                 },                 {                     "match": {"interests":"%s"}                 },                 {                     "match": {"introduction":"%s"}                 }             ]         }     }`     rawQuery := elastic.NewRawStringQuery(fmt.Sprintf(queryStr, keyword, keyword, keyword, keyword))     PrintQuery(rawQuery)       searchResult, err := client.Search("school").Type("student").         Query(rawQuery).From(0).Size(10).Do(context.Background())     if err != nil {         log.Println("Search Error: ", err)         return nil     }     fmt.Printf("Query took %d milliseconds, total: %d\n", searchResult.TookInMillis, searchResult.Hits.TotalHits)       var students []*Student     var stuType Student     for _, item := range searchResult.Each(reflect.TypeOf(stuType)) {         if stu, ok := item.(Student); ok {             students = append(students, &stu)         }     }     return students }   /** * 添加/修改  */ func Add(indexId string, stu *Student) error {     if stu == nil {         return errors.New("Add Error: data empty!")     }     ret, err := client.Index().Index("school").Type("student").         Id(indexId).BodyJson(stu).Do(context.Background())     if err != nil {         log.Println("Add Error: ", err)         return err     }     fmt.Printf("Indexed %s to index %s, type %s\n", ret.Id, ret.Index, ret.Type)     return nil }   /** * 删除  */ func Remove(indexId string) error {     ret, err := client.Delete().Index("school").Type("student").         Id(indexId).Do(context.Background())     if err != nil {         log.Println("Remove Error: ", err)         return err     }     fmt.Printf("delete result: %d, %s\n", ret.Status, ret.Result)     return nil }