PHP implements Mongodb custom generation of self-increasing IDs

How to implement Mongodb custom generation of self-increasing ID in php? This article mainly introduces how PHP implements Mongodb's custom method to generate auto-increment IDs. It analyzes the implementation of Mongodb's auto-increment fields and the corresponding PHP methods with examples. I hope to be helpful.

The example of this article describes how PHP implements Mongodb's custom method to generate self-increasing IDs. Share it with everyone for your reference. The specific analysis is as follows:

//首先创建一个自动增长id集合 ids
>db.ids.save({name:"user", id:0});
//可以查看一下是否成功
> db.ids.find();
{ "_id" : ObjectId("4c637dbd900f00000000686c"), "name" : "user", "id" : 0 }
//然后每次添加新用户之前自增一下 ids集合 获得id
>userid = db.ids.findAndModify({update:{$inc:{'id':1}}, query:{"name":"user"}, new:true});
{ "_id" : ObjectId("4c637dbd900f00000000686c"), "name" : "user", "id" : 1 }
//注：因为findAndModify是一个方法完成更新查找两个操作，所以具有原子性，多线程不会冲突。
//然后保存相应的数据
>db.user.save({uid:userid.id, username:"kekeles", password:"kekeles", info:"http://www.jb51.net/ "});
//查看结果
> db.user.find();
{ "_id" : ObjectId("4c637f79900f00000000686d"), "uid" : 1, "username" : "admin", "password" : "admin" }
//这是mongo的shell，如果用的是服务器端程序java php python，可以自己对这些操作封装一下，只用传几个参数就可以返回自增的id，还可以实现像Oracle的跨表的自增id。

I wrote a piece of php myself and shared it with everyone.

<?php
function mid($name, $db){
$update = array(&#39;$inc&#39;=>array("id"=>1));
$query = array(&#39;name&#39;=>$name);
$command = array(
&#39;findandmodify&#39;=>&#39;ids&#39;, &#39;update&#39;=>$update,
&#39;query&#39;=>$query, &#39;new&#39;=>true, &#39;upsert&#39;=>true
);
$id = $db->command($command);
return $id[&#39;value&#39;][&#39;id&#39;];
}
$conn = new Mongo();
$db = $conn->idtest;
$id = mid(&#39;user&#39;, $db);
$db->user->save(array(
&#39;uid&#39;=>$id, 
&#39;username&#39;=>&#39;kekeles&#39;, 
&#39;password&#39;=>&#39;kekeles&#39;,
 &#39;info&#39;=>&#39;http://www.jb51.net/ &#39;
));
$conn->close();
?>

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