我正在尝试使用 php 连接 mongo db 中的两个字段以获得庞大的数据集。以下是我到目前为止找到并尝试的示例解决方案，但这在 php 中不起作用。任何人都可以帮助进行必要的更正（如果有的话）在下面的代码中。
var pipeline = [
{
"$project": {
"data1": 1,
"data2": { $concat: [ "$data1", " ", "$data2" ] }
}
}
],
cursor = db.collection.aggregate(pipeline),
bulkUpdateOps = cursor.map(function (doc) {
return {
"updateOne": {
"filter": { "_id": doc._id },
"update": { "$set": { "data2": doc.data2 } }
}
};
});
db.collection.bulkWrite(bulkUpdateOps);
我正在使用作曲家命令按照您在评论中的建议安装 mongo-php-library：
$composer require "mongodb/mongodb=^1.0.0"
但它没有用.php MONGO 驱动程序是 1.6.12。 而 MONGO DB 版本是 3.2.3 . 错误如下：
Your version of PHP, 5.4.16, is affected by CVE-2013-6420 and cannot safely perform certificate validation, we strongly suggest you upgrade.
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- mongodb/mongodb 1.0.1 requires ext-mongodb ^1.1.0 -> the requested PHP extension mongodb is missing from your system.
- mongodb/mongodb 1.0.0 requires ext-mongodb ^1.1.0 -> the requested PHP extension mongodb is missing from your system.
- Installation request for mongodb/mongodb ^1.0.0 -> satisfiable by mongodb/mongodb[1.0.0, 1.0.1].
To enable extensions, verify that they are enabled in those .ini files:
- /etc/php.ini
- /etc/php.d/curl.ini
- /etc/php.d/dom.ini
- /etc/php.d/fileinfo.ini
- /etc/php.d/json.ini
- /etc/php.d/mbstring.ini
- /etc/php.d/mysql.ini
- /etc/php.d/mysqli.ini
- /etc/php.d/pdo.ini
- /etc/php.d/pdo_mysql.ini
- /etc/php.d/pdo_sqlite.ini
- /etc/php.d/phar.ini
- /etc/php.d/posix.ini
- /etc/php.d/sqlite3.ini
- /etc/php.d/sysvmsg.ini
- /etc/php.d/sysvsem.ini
- /etc/php.d/sysvshm.ini
- /etc/php.d/wddx.ini
- /etc/php.d/xmlreader.ini
- /etc/php.d/xmlwriter.ini
- /etc/php.d/xsl.ini
- /etc/php.d/zip.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
Installation failed, deleting ./composer.json.
我需要帮助安装此库。我是否安装了错误的版本？
谢谢大家的帮助，但我无法安装 mongo php 库，所以上面的解决方案对我不起作用。我找到了另一种我想分享的方式来合并两个使用 shell 命令的字段。在 php 文件中：
$concat_Command = "mongo < concat.sql";
shell_exec($concat_Command);
康卡特.sql
use dbname;
db.collection.find().forEach(function(doc){
db.collection.update(
{ "_id": doc._id },
{ "$set": { "description": doc.title+" "+doc.description } }
)
});
如果没有看到你在 PHP 中解决这个问题的尝试，下面的大部分内容都是基于假设的，因此可能无法提供最佳解决方案，但仍然可以作为指导，引导你朝着正确的方向前进以解决您的问题。
将 PHP 驱动程序与免费的 mongo-php-library（在裸机驱动程序之上实现功能更全的 API）结合使用，将聚合管道和后续批量更新操作构造为：
$pipeline = [["$project" => ["data1" => 1, "data2" => ["$concat" => [ "$data1", " ", "$data2" ]]]]];
$operation = new Aggregate($databaseName, $collectionName, $pipeline, ['typeMap' => $typeMap]);
$cursor = $operation->execute($primaryServer);
$results = iterator_to_array($cursor);
function mapper($doc) {
return [
"updateOne" => [
["_id" => $doc["_id"]],
[
"$set" => [
"data2" => $doc["_id"]
]
]
]
]
};
$ops = array_map("mapper", $results);
$bulkUpdateOps = new BulkWrite($databaseName, $collectionName, $ops);
$writeResult = $bulkUpdateOps->execute($primaryServer);
在上面，$primaryServer是BulkWrite execute()方法的参数，它应该包含MongoDB'Driver'Server对象的实例，即您的主MongoDB服务器连接详细信息。$typeMap变量是 Aggregate() 构造函数中的可选参数，用于表示 BSON 反序列化的类型映射。这将应用于返回的游标。
如果您使用的是旧版驱动程序，请考虑运行以下操作，该操作使用 MongoDB 提供的批量操作 API>= 2.6 <= 3.0：
$client = new MongoClient();
$collection = $client->selectCollection("database", "collection");
$pipeline = array(
array(
"$project" => array(
'data1' => 1,
"data2" => array("$concat" => array( "$data1", " ", "$data2" ))
)
)
);
$batch = new MongoUpdateBatch($collection);
$counter = 0;
foreach ($collection->aggregate($pipeline) as $doc ) {
$batch->add(
array(
"q" => array( '_id' => $doc['_id'] ),
"u" => array(
'$set' => array(
"data2" => $doc["data2"]
)
)
)
);
$counter++;
if ($counter % 500 === 0) {
$retval = $batch->execute(array( 'w' => 1));
$counter++;
$batch = new MongoUpdateBatch($collection);
}
}
if ($counter > 0) {
$retval = $batch->execute(array( 'w' => 1 ));
}