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ES elasticsearch put和post的區別

時間：2021-07-28 21:38:00 阅读：0 評論：0 收藏：0 [點我收藏+]

標簽：區別創建 web 多個 ebs arch get pos post

1、冪等操作

冪等（idempotent、idempotence）是一個數學與計算機學概念，常見于抽象代數中。

在編程中.一個冪等操作的特點是其任意多次執行所産生的影響均與一次執行的影響相同。冪等函數，或冪等方法，是指可以使用相同參數重複執行，並能獲得相同結果的函數。這些函數不會影響系統狀態，也不用擔心重複執行會對系統造成改變。

2、POST和PUT的區別

HTTP的其他幾個動詞GET、DELETE等就不詳談了，這裏主要說下POST和PUT。

在操作时的區別如下：

POST /uri 創建
DELETE /uri/xxx 删除
PUT /uri/xxx 更新或創建
GET /uri/xxx 查看

POST不用加具體的id，它是作用在一個集合資源之上的（/uri），而PUT操作是作用在一個具體資源之上的（/uri/xxx）。

在ES中，如果不确定document的ID（documents具体含义见下），那么直接POST对应uri（ “POST /website/blog” ），ES可以自己生成不会发生碰撞的UUID；

如果确定document的ID，比如 “PUT /website/blog/123”，那么执行創建或修改（修改时_version版本号提高1）

在幂等性的區別如下：

PUT、GET、DELETE是幂等的，由于同一条这样的指令，执行多次结果都一样。比如 PUT /uri/xxx 多次，那么结果和这条指令执行一次效果一样。

而POST是非幂等的，执行多次更改多次服务器状态。比如POST /uri 多次，那么生成多個UUID的document，执行多次效果当然和执行一次不一样了。

ES elasticsearch put和post的區別

標簽：區別創建 web 多個 ebs arch get pos post

原文地址：https://www.cnblogs.com/lovezhr/p/15071581.html

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