目录
- go语言操作es
- 解决golang使用elastic连接elasticsearch时自动转换连接地址
- 初始化
- 数据创建
-
- 查找
- 修改
- 删除
- 查找
- 集群搭建
-
go语言操作es
go get github.com/olivere/elastic
解决golang使用elastic连接elasticsearch时自动转换连接地址
elastic.SetSniff(false)
client, _ := elastic.NewClient(
// ...
// 将sniff设置为false后,便不会自动转换地址
elastic.SetSniff(false),
)
初始化
var client *elastic.Client
var host = "http://xxx:9200"
func init() {
errorlog := log.New(os.Stdout, "app", log.LstdFlags)
var err error
client, err = elastic.NewClient(elastic.SetErrorLog(errorlog), elastic.SetURL(host), elastic.SetSniff(false))
if err != nil {
panic(err)
}
info, code, err := client.Ping(host).Do(context.Background())
if err != nil {
panic(err)
}
fmt.Printf("Es return with code %d and version %s \n", code, info.Version.Number)
esversionCode, err := client.ElasticsearchVersion(host)
if err != nil {
panic(err)
}
fmt.Printf("es version %s\n", esversionCode)
}
数据创建
info —>employee -------FirstName,LastName,Age,About,Interests
结构体方式
type Employee struct {
FirstName string `json:"firstname"`
LastName string `json:"lastname"`
Age int `json:"age"`
About string `json:"about"`
Interests []string `json:"interests"`
}
func create() {
e1 := Employee{"jane", "Smith", 20, "I like music", []string{"music"}}
put, err := client.Index().Index("info").Type("employee").Id("1").BodyJson(e1).Do(context.Background())
if err != nil {
panic(err)
}
fmt.Printf("indexed %d to index %s, type %s \n", put.Id, put.Index, put.Type)
}
func main() {
create()
}
字符串方式:
func create1() {
e1 := `{"firstname":"john","lastname":"smith","age":22,"about":"i like book","interests":["book","music"]}`
put, err := client.Index().Index("info").Type("employee").Id("2").BodyJson(e1).Do(context.Background())
if err != nil {
panic(err)
}
fmt.Printf("indexed %d to index %s, type %s \n", put.Id, put.Index, put.Type)
}
查找
func get() {
get, err := client.Get().Index("info").Type("employee").Id("1").Do(context.Background())
if err != nil {
panic(err)
}
if get.Found {
fmt.Printf("got document %s in version %d from index %s,type %s \n", get.Id, get.Version, get.Index, get.Type)
}
}
func main() {
get()
}
修改
func update() {
res, err := client.Update().Index("info").Type("employee").Id("1").Doc(map[string]interface{}{"age": 88}).Do(context.Background())
if err != nil {
fmt.Println(err.Error())
}
fmt.Printf("update age %s \n", res.Result)
}
func main() {
update()
}
删除
func delete() {
res, err := client.Delete().Index("info").Type("employee").Id("1").Do(context.Background())
if err != nil {
fmt.Println(err.Error())
}
fmt.Printf("delete result %s", res.Result)
}
func main() {
delete()
}
查找
func query() {
var res *elastic.SearchResult
var err error
res, err = client.Search("info").Type("employee").Do(context.Background())
printEmployee(res, err)
}
func printEmployee(res *elastic.SearchResult, err error) {
if err != nil {
fmt.Print(err.Error())
return
}
var typ Employee
for _, item := range res.Each(reflect.TypeOf(typ)) {
t := item.(Employee)
fmt.Printf("%#v\n", t)
}
}
func query1() {
var res *elastic.SearchResult
var err error
q := elastic.NewQueryStringQuery("lastname:smith")
res, err = client.Search("info").Type("employee").Query(q).Do(context.Background())
printEmployee(res, err)
if res.Hits.TotalHits > 0 {
fmt.Printf("found a total fo %d Employee", res.Hits.TotalHits)
for _, hit := range res.Hits.Hits {
var t Employee
err := json.Unmarshal(*hit.Source, &t)
if err != nil {
fmt.Println("failed")
}
fmt.Printf("employee name %s:%s\n", t.FirstName, t.LastName)
}
} else {
fmt.Printf("found no employee \n")
}
}
年龄大于21的查找
func query3() {
var res *elastic.SearchResult
var err error
boolq := elastic.NewBoolQuery()
boolq.Must(elastic.NewMatchQuery("lastname", "smith"))
boolq.Filter(elastic.NewRangeQuery("age").Gt(21))
res, err = client.Search("info").Type("employee").Query(boolq).Do(context.Background())
printEmployee(res, err)
}
func printEmployee(res *elastic.SearchResult, err error) {
if err != nil {
fmt.Print(err.Error())
return
}
var typ Employee
for _, item := range res.Each(reflect.TypeOf(typ)) {
t := item.(Employee)
fmt.Printf("%#v\n", t)
}
}
包含book的
func query4() {
var res *elastic.SearchResult
var err error
matchPhrase := elastic.NewMatchPhraseQuery("about", "book")
res, err = client.Search("info").Type("employee").Query(matchPhrase).Do(context.Background())
printEmployee(res, err)
}
分页
func list(size, page int) {
var res *elastic.SearchResult
var err error
if size < 0 || page < 1 {
fmt.Printf("param error")
return
}
res, err = client.Search("info").Type("employee").Size(size).From((page - 1) * size).Do(context.Background())
printEmployee(res, err)
}
集群搭建
配置文件修改
node.name : node-102
node.name : node-103
network.host: 192.168.1.102
network.host: 192.168.1.103
discovery.zen.ping.unicast.hosts: ["s201","s202","s203"]
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