升級PHP7操做MongoDB

前言

使用 PHP+MongoDB 的用戶不少，由於 MongoDB 對非結構化數據的存儲很方便。在 PHP5 及之前，官方提供了兩個擴展，Mongo 和 MongoDB，其中 Mongo 是對以 MongoClient 等幾個核心類爲基礎的類羣進行操做，封裝得很方便，因此基本上都會選擇 Mongo 擴展。

詳情請見官方手冊：http://php.net/manual/zh/book...

可是隨着 PHP5 升級到 PHP7，官方再也不支持 Mongo 擴展，只支持 MongoDB，而 PHP7 的性能提高巨大，讓人沒法割捨，因此怎麼把 Mongo 替換成 MongoDB 成爲了一個亟待解決的問題。MongoDB 引入了命名空間，可是功能封裝很是差，若是非要用原生的擴展，幾乎意味着寫原生的 Mongo 語句。這種想法很違背 ORM 簡化 DB IO 操做帶來的語法問題而專一邏輯優化的思路。

詳情也可參見官方手冊：http://php.net/manual/zh/set....

在這種狀況之下，MongoDB 官方忍不住了，爲了方便使用，增長市場佔有率，推出了基於MongoDB 擴展的庫：https://github.com/mongodb/mo...

該庫的詳細文檔見：https://docs.mongodb.com/php-...

MongoDB 驅動

若是使用原驅動的話，大體語法以下：

<?php

use MongoDB\Driver\Manager;
use MongoDB\Driver\BulkWrite;
use MongoDB\Driver\WriteConcern;
use MongoDB\Driver\Query;
use MongoDB\Driver\Command;

class MongoDb {

    protected $mongodb;
    protected $database;
    protected $collection;
    protected $bulk;
    protected $writeConcern;
    protected $defaultConfig
        = [
            'hostname' => 'localhost',
            'port' => '27017',
            'username' => '',
            'password' => '',
            'database' => 'test'
        ];

    public function __construct($config) {
        $config = array_merge($this->defaultConfig, $config);
        $mongoServer = "mongodb://";
        if ($config['username']) {
            $mongoServer .= $config['username'] . ':' . $config['password'] . '@';
        }
        $mongoServer .= $config['hostname'];
        if ($config['port']) {
            $mongoServer .= ':' . $config['port'];
        }
        $mongoServer .= '/' . $config['database'];

        $this->mongodb = new Manager($mongoServer);
        $this->database = $config['database'];
        $this->collection = $config['collection'];
        $this->bulk = new BulkWrite();
        $this->writeConcern = new WriteConcern(WriteConcern::MAJORITY, 100);
    }

    public function query($where = [], $option = []) {
        $query = new Query($where, $option);
        $result = $this->mongodb->executeQuery("$this->database.$this->collection", $query);

        return json_encode($result);
    }

    public function count($where = []) {
        $command = new Command(['count' => $this->collection, 'query' => $where]);
        $result = $this->mongodb->executeCommand($this->database, $command);
        $res = $result->toArray();
        $count = 0;
        if ($res) {
            $count = $res[0]->n;
        }

        return $count;
    }

    public function update($where = [], $update = [], $upsert = false) {
        $this->bulk->update($where, ['$set' => $update], ['multi' => true, 'upsert' => $upsert]);
        $result = $this->mongodb->executeBulkWrite("$this->database.$this->collection", $this->bulk, $this->writeConcern);

        return $result->getModifiedCount();
    }

    public function insert($data = []) {
        $this->bulk->insert($data);
        $result = $this->mongodb->executeBulkWrite("$this->database.$this->collection", $this->bulk, $this->writeConcern);

        return $result->getInsertedCount();
    }

    public function delete($where = [], $limit = 1) {
        $this->bulk->delete($where, ['limit' => $limit]);
        $result = $this->mongodb->executeBulkWrite("$this->database.$this->collection", $this->bulk, $this->writeConcern);

        return $result->getDeletedCount();
    }
}

這樣的語法和以前差別太大，改動不方便，換 PHP MongoDB 庫

MongoDB 庫

1.鏈接

• 原

new MongoClient();

• 新

new MongoDB\Client();

2.新增

• 原

$collention->insert($array, $options);

• 新

$resultOne = $collention->insertOne($array, $options);//單
$lastId = $resultOne->getInsertedId();
$resultMany = $collention->insertMany($array, $options);//多
$count = $resultMany->getInsertedCount();

3.修改

• 原

$collention->update($condition, [
    '$set' => $values
,[
    'multiple' => true//多條，單條false
]);

• 新

$collection->updateOne(
    ['state' => 'ny'],
    ['$set' => ['country' => 'us']]
);
$updateResult = $collection->updateMany(
    ['state' => 'ny'],
    ['$set' => ['country' => 'us']]
);
$count = $updateResult->getModifiedCount();

4.查詢

• 原

$cursor = $collection->find($condition, [
    'name' => true//指定字段
]);
$cursor->skip(5);
$cursor->limit(5);
$cursor->sort([
    'time' => -1
]);

• 新

$cursor = $collection->find($condition, [
    'skip' => 5,
    'limit' => 5,
    'sort' => [
        'time' => -1
    ],//排序
    'projection' => [
        'name' => 1//指定字段
    ]
]);

5.刪除

• 原

$collention->remove($condition, [
    'justOne' => false//刪單條
]);
$collention->remove([]);//刪全部

• 新

$result = $collention->deleteOne($condition, $options);
$collention->deleteMany($condition, $options);

$result->getDeletedCount();

補充

有些人可能習慣以相似 MySQL 的自增 ID 來處理數據，之前可能使用 findAndModify() 方法來查詢並修改：

$collention->findAndModify([
    '_id' => $tableName//我在自增表中用其它的表名做主鍵
], [
    '$inc' => ['id' => 1]//自增
], [
    '_id' => 0
], [
    'new' => 1//返回修改後的結果，默認是修改前的
]);

如今使用 MongoDB 庫的話須要修改成：

$collention->findOneAndUpdate([
    '_id' => $tableName
], [
    '$inc' => ['id' => 1]
], [
    'projection' => ['id' => 1],
    'returnDocument' => MongoDB\Operation\FindOneAndUpdate::RETURN_DOCUMENT_AFTER
]);

相似的還有 findOneAndDelete() findOneAndReplace()，更多內容可見文檔