How to use MongoDB with PHP for paginated query

How PHP uses MongoDB for paging queries

Overview:
MongoDB is a non-relational database that is often used to store large amounts of document data, while PHP is a popular server-side scripting language. In this article, we will introduce how to use PHP to connect to MongoDB and implement paging query function.

Step 1: Install the MongoDB extension
Interacting with MongoDB in PHP requires installing the MongoDB extension. You can install the MongoDB extension through the following command:

pecl install mongodb

Or use the following command to enable the extension in the php.ini file:

extension=mongodb

Step 2: Connect to the MongoDB database
In PHP, you need to use the MongoDBDriverManager class provided by the MongoDB extension to connect to the MongoDB database. The following is a sample code:

<?php
$mongoUri = 'mongodb://localhost:27017';  // MongoDB数据库地址
$manager = new MongoDBDriverManager($mongoUri);
?>

Step 3: Implement paging query
MongoDB provides the MongoDBDriverQuery class to perform query operations, and you can set its skip() and limit() methods to implement paging function. The following is a sample code:

<?php
$collection = 'my_collection';  // 集合名称
$page = 1;  // 当前页码
$perPage = 10;  // 每页显示的记录数

// 构建查询条件
$query = new MongoDBDriverQuery([], [
    'skip' => ($page - 1) * $perPage,
    'limit' => $perPage,
]);

// 执行查询
$cursor = $manager->executeQuery($collection, $query);

// 遍历结果集
foreach ($cursor as $document) {
    var_dump($document);
}
?>

Specify the starting position of the query by setting the skip() method, and specify the display of each page by setting the limit() method number of records.

Note:

1. If you need to sort the query results, you can pass the sorting conditions in the first parameter of the Query class.
2. In actual applications, the current page number and the number of records displayed on each page can be passed to the server through request parameters according to the user's needs.

Summary:
This article introduces how to use PHP to connect to the MongoDB database and implement the paging query function based on MongoDB. By using the query and paging methods provided by the MongoDB extension, you can easily process large amounts of MongoDB document data in PHP applications.

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