Elastic-Go 介绍
Elastic是Elasticsearch的Go语言客户端开发包。
快速入门：
// Create a client
client, err := elastic.NewClient()
if err != nil {
// Handle error
}
// Create an index
_, err = client.CreateIndex("twitter").Do()
if err != nil {
// Handle error
panic(err)
}
// Add a document to the index
tweet := Tweet{User: "olivere", Message: "Take Five"}
_, err = client.Index().
Index("twitter").
Type("tweet").
Id("1").
BodyJson(tweet).
Refresh(true).
Do()
if err != nil {
// Handle error
panic(err)
}
// Search with a term query
termQuery := elastic.NewTermQuery("user", "olivere")
searchResult, err := client.Search().
Index("twitter"). // search in index "twitter"
Query(termQuery). // specify the query
Sort("user", true). // sort by "user" field, ascending
From(0).Size(10). // take documents 0-9
Pretty(true). // pretty print request and response JSON
Do() // execute
if err != nil {
// Handle error
panic(err)
}
// searchResult is of type SearchResult and returns hits, suggestions,
// and all kinds of other @R_749_4045@ion from Elasticsearch.
fmt.Printf("Query took %d milliseconds\n", searchResult.TookInMillis)
// Each is a convenience function that iterates over hits in a search result.
// It makes sure you don't need to check for nil values in the response.
// However, it ignores errors in serialization. If you want full control
// over iterating the hits, see below.
var ttyp Tweet
for _, item := range searchResult.Each(reflect.TypeOf(ttyp)) {
if t, ok := item.(Tweet); ok {
fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
}
}
// TotalHits is another convenience function that works even when something goes wrong.
fmt.Printf("Found a total of %d tweets\n", searchResult.TotalHits())
// Here's how you iterate through results with full control over each step.
if searchResult.Hits.TotalHits > 0 {
fmt.Printf("Found a total of %d tweets\n", searchResult.Hits.TotalHits)
// Iterate through results
for _, hit := range searchResult.Hits.Hits {
// hit.Index contains the name of the index
// Deserialize hit.source into a Tweet (Could also be just a map[string]interface{}).
var t Tweet
err := json.Unmarshal(*hit.source, &t)
if err != nil {
// Deserialization Failed
}
// Work with tweet
fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
}
} else {
// No hits
fmt.Print("Found no tweets\n")
}
// Delete the index again
_, err = client.DeleteIndex("twitter").Do()
if err != nil {
// Handle error
panic(err)
}
Elastic-Go 官网
https://github.com/olivere/elastic
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