- 授权协议: MIT
- 开发语言: Google Go
- 操作系统: 跨平台
- 软件首页: https://github.com/olivere/elastic
- 软件文档: https://github.com/olivere/elastic
软件介绍
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 information 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)
}
Kotlin程序员面试算法宝典
孙伟、楚秦 / 机械工业出版社 / 2018-12 / 69
本书是一本讲解程序员面试笔试算法的书籍。在写法上,除了讲解如何解答算法问题以外,还引入了例子辅以说明,以便读者能够更加容易地理解。 本书将程序员面试笔试过程中的各类算法类真题一网打尽。在题目的广度上,通过各种渠道,搜集了近3年来几乎所有IT企业面试笔试算法高频题目,所选择题目均为企业招聘使用题目;在题目的深度上,本书由浅入深、庖丁解牛式地分析每一个题目,并提炼归纳,同时,引入例子与源代码、时......一起来看看 《Kotlin程序员面试算法宝典》 这本书的介绍吧!
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