适用于PHP的MongoDB连接器:计算分页文档 [英] MongoDB connector for PHP: count documents for pagination

问题描述

我正在使用MongoDB\Driver\Manager通过PHP连接到MongoDB.驱动程序版本为1.6.14，我可以连接并进行查询.

I'm using the MongoDB\Driver\Manager to connect to MongoDB using PHP. The driver version is 1.6.14 and I can connect and make a query.

但是我需要用于查询的文档总数才能进行分页:

But I need the total number of documents for my query to make the pagination:

$reg_pag = 20;
$pag = $_GET["pag"];

$mng = new MongoDB\Driver\Manager("mongodb://localhost:27017");
$filter = [];
$filter["brand"] = $_GET["brand"];
$options = ["skip" => ($pag-1)*$reg_pag , "limit" => $reg_pag];
$query = new MongoDB\Driver\Query($filter, $options);
$rows = $mng->executeQuery("carsdb.cars", $query);

我尝试使用$rows->count()和count($rows).第一个命令不起作用，最后一个命令返回过滤后的数据(返回20).

I try with $rows->count() and with count($rows). The first command doesn't work and the last command returns the filtered data (return 20).

推荐答案

使用

Use executeCommand method. Try something like the following code:

$mongo = new MongoDB\Driver\Manager("mongodb://localhost:27017");
// search params
$query = ["brand" => $_GET["brand"]];
// define a command - not only a regular query
$command = new MongoDB\Driver\Command(["count" => "cars", "query" => $query]);
try {
    // execute the command here on your database
    $result = $mongo->executeCommand("carsdb", $command);
    $res = current($result->toArray());
    $count = $res->n;
    echo $count;
} catch (MongoDB\Driver\Exception\Exception $e) {
    echo $e->getMessage(), "\n";
}

来自此处，并根据您的情况进行调整.

Taken from here, with an adaptation to your case.

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