golang如何操作elasticsearch？

2025-01-27 技术教程

不懂golang如何操作elasticsearch？？其实想解决这个问题也不难，下面让小编带着大家一起学习怎么去解决，希望大家阅读完这篇文章后大所收获。

1、前提

1.1 docker 安装elasticsearch

查询elasticsearch 版本

docker search elasticsearch

将对应的版本拉到本地

docker.elastic.co/elasticsearch/elasticsearch:7.3.0

创建一个网络

docker network create esnet

启动容器

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

1.2这里过后就可以去写go代码为了直观搞了个可视化工具 ElisticHD 这里使用docker 部署

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

可以试一下界面还是很美观的

2、golang 实现elasticsearch 简单的增删改查

直接上代码：

package mainimport ( "context" "encoding/json" "fmt" "github.com/olivere/elastic/v7" "reflect")var client *elastic.Clientvar 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Employeefunc 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)}

有一个小坑要注意在代码中已经注释了，如果没有添加就会有下面错误

no active connection found: no Elasticsearch node available

解决

Docker No Elastic Node Aviable

关闭sniff模式；或者设置es的地址为 publish_address 地址

代码设置 sniff 为false

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