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
结构体方式字符串方式： 查找修改删除查找 集群搭建
配置文件修改
go语言操作esgo 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"
//初始化es驱动
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 %sn", 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"`
}
//创建索引
func create() {
//1.使用结构体方式存入到es里面
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() {
//使用字符串
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
//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
//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)
}
//打印查询的employee
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("%#vn", t)
}
}
//条件查找
func query1() {
var res *elastic.SearchResult
var err error
//查找方式一：
q := elastic.NewQueryStringQuery("lastname:smith")
res, err = client.Search("info").Type("employee").Query(q).Do(context.Background())
printEmployee(res, err)
//查找方法二：
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) //另一种取出的方法
if err != nil {
fmt.Println("failed")
}
fmt.Printf("employee name %s:%sn", t.FirstName, t.LastName)
}
} else {
fmt.Printf("found no employee n")
}
}
年龄大于21的查找
//年龄大于21的
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)
}
//打印查询的employee
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("%#vn", t)
}
}
包含book的
//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
//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"]
