PHP implements Mongodb custom generation of self-increasing IDs-PHP Tutorial-php.cn

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。

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

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