golang操作elasticsearch的实现_Golang_

 docker search elasticsearch

 docker.elastic.co/elasticsearch/elasticsearch:7.3.0

 docker network create esnet

 docker run --name es -p 9200:9200 -p 9300:9300 --network esnet -e "discovery.type=single-node" bdaab402b220

 docker run -p 9800:9800 -d --link es:demo --network esnet -e "discovery.type=single-node" containerize/elastichd

 package main import ( "context" "encoding/json" "fmt" "github.com/olivere/elastic/v7" "reflect" ) var client *elastic.Client var host = "http://ip:port" type Employee struct { FirstName string `json:"first_name"` LastName string `json:"last_name"` Age int `json:"age"` About string `json:"about"` Interests []string `json:"interests"` } //初始化 func init() { //errorlog := log.New(os.Stdout, "APP", log.LstdFlags) var err error //这个地方有个小坑 不加上elastic.SetSniff(false) 会连接不上 client, err = elastic.NewClient(elastic.SetSniff(false), elastic.SetURL(host)) if err != nil { panic(err) } _,_,err = client.Ping(host).Do(context.Background()) if err != nil { panic(err) } //fmt.Printf("Elasticsearch returned with code %d and version %s\n", code, info.Version.Number) _,err = client.ElasticsearchVersion(host) if err != nil { panic(err) } //fmt.Printf("Elasticsearch version %s\n", esversion) } /*下面是简单的CURD*/ //创建 func create() { //使用结构体 e1 := Employee{"Jane", "Smith", 32, "I like to collect rock albums", []string{"music"}} put1, err := client.Index(). Index("megacorp"). Type("employee"). Id("1"). BodyJson(e1). Do(context.Background()) if err != nil { panic(err) } fmt.Printf("Indexed tweet %s to index s%s, type %s\n", put1.Id, put1.Index, put1.Type) //使用字符串 e2 := `{"first_name":"John","last_name":"Smith","age":25,"about":"I love to go rock climbing","interests":["sports","music"]}` put2, err := client.Index(). Index("megacorp"). Type("employee"). Id("2"). BodyJson(e2). Do(context.Background()) if err != nil { panic(err) } fmt.Printf("Indexed tweet %s to index s%s, type %s\n", put2.Id, put2.Index, put2.Type) e3 := `{"first_name":"Douglas","last_name":"Fir","age":35,"about":"I like to build cabinets","interests":["forestry"]}` put3, err := client.Index(). Index("megacorp"). Type("employee"). Id("3"). BodyJson(e3). Do(context.Background()) if err != nil { panic(err) } fmt.Printf("Indexed tweet %s to index s%s, type %s\n", put3.Id, put3.Index, put3.Type) } //查找 func gets() { //通过id查找 get1, err := client.Get().Index("megacorp").Type("employee").Id("2").Do(context.Background()) if err != nil { panic(err) } if get1.Found { fmt.Printf("Got document %s in version %d from index %s, type %s\n", get1.Id, get1.Version, get1.Index, get1.Type) var bb Employee err:=json.Unmarshal(get1.Source,&bb) if err!=nil{ fmt.Println(err) } fmt.Println(bb.FirstName) fmt.Println(string(get1.Source)) } } // //删除 func delete() { res, err := client.Delete().Index("megacorp"). Type("employee"). Id("1"). Do(context.Background()) if err != nil { println(err.Error()) return } fmt.Printf("delete result %s\n", res.Result) } // //修改 func update() { res, err := client.Update(). Index("megacorp"). Type("employee"). Id("2"). Doc(map[string]interface{}{"age": 88}). Do(context.Background()) if err != nil { println(err.Error()) } fmt.Printf("update age %s\n", res.Result) } // ////搜索 func query() { var res *elastic.SearchResult var err error //取所有 res, err = client.Search("megacorp").Type("employee").Do(context.Background()) printEmployee(res, err) //字段相等 q := elastic.NewQueryStringQuery("last_name:Smith") res, err = client.Search("megacorp").Type("employee").Query(q).Do(context.Background()) if err != nil { println(err.Error()) } printEmployee(res, err) //条件查询 //年龄大于30岁的 boolQ := elastic.NewBoolQuery() boolQ.Must(elastic.NewMatchQuery("last_name", "smith")) boolQ.Filter(elastic.NewRangeQuery("age").Gt(30)) res, err = client.Search("megacorp").Type("employee").Query(q).Do(context.Background()) printEmployee(res, err) //短语搜索 搜索about字段中有 rock climbing matchPhraseQuery := elastic.NewMatchPhraseQuery("about", "rock climbing") res, err = client.Search("megacorp").Type("employee").Query(matchPhraseQuery).Do(context.Background()) printEmployee(res, err) //分析 interests aggs := elastic.NewTermsAggregation().Field("interests") res, err = client.Search("megacorp").Type("employee").Aggregation("all_interests", aggs).Do(context.Background()) printEmployee(res, err) } // ////简单分页 func list(size,page int) { if size < 0 || page < 1 { fmt.Printf("param error") return } res,err := client.Search("megacorp"). Type("employee"). Size(size). From((page-1)*size). Do(context.Background()) printEmployee(res, err) } // //打印查询到的Employee func printEmployee(res *elastic.SearchResult, err error) { if err != nil { print(err.Error()) return } var typ Employee for _, item := range res.Each(reflect.TypeOf(typ)) { //从搜索结果中取数据的方法 t := item.(Employee) fmt.Printf("%#v\n", t) } } func main() { create() delete() update() gets() query() list(2,1) }