How to use thinkorm to easily implement paging query function

How to use thinkorm to easily implement paging query function

Overview:
When developing a website or application, it is often necessary to perform paging query on the data in the database in order to display part of the data on the page and provide Page turning function. This article will introduce how to use the thinkorm framework to easily implement the paging query function, and provide relevant code examples.

Step 1: Install thinkorm
First, you need to install the thinkorm framework in the project. You can use the following command to install it:

composer require topthink/think-orm

Step 2: Configure database connection information
In the project In the configuration file (such as config/database.php), configure the database connection information, including database type, host name, user name, password, etc.

return [
    // 数据库类型
    'type'     => 'mysql',
    // 服务器地址
    'hostname' => '127.0.0.1',
    // 数据库名
    'database' => 'test',
    // 用户名
    'username' => 'root',
    // 密码
    'password' => '123456',
    // 端口
    'hostport' => '',
    // 连接dsn
    'dsn'      => '',
    // 数据库连接参数
    'params'   => [],
    // 数据库编码默认采用utf8
    'charset'  => 'utf8',
    // 数据库表前缀
    'prefix'   => '',
    // 数据库调试模式
    'debug'    => true,
    // 数据库部署方式:0 集中式(单一服务器),1 分布式(主从服务器)
    'deploy'   => 0,
    // 数据库读写是否分离 主从式有效
    'rw_separate' => false,
    // 读写分离后 主服务器数量
    'master_num'  => 1,
    // 指定从服务器序号
    'slave_no'    => '',
];

Step 3: Define the model class
Create a new model class in the model directory of the project, which inherits from the basic model class of the thinkorm framework hinkModel. Define the attributes corresponding to the database table and some methods that need to be used in the model class.

For example, suppose we have a model class named User, which corresponds to the users table in the database. We can define the following properties and methods in the model class:

namespace appmodel;

use thinkModel;

class User extends Model
{
    // 设置当前模型对应的完整数据表名称
    protected $table = 'users';

    // 设置当前模型的数据库连接
    protected $connection = 'database';

    // 定义查询分页数据的方法
    public function getPageData($page, $size)
    {
        return $this->paginate($size, false, ['page' => $page]);
    }
}

In the above code, the $table property specifies the name of the database table, and the $connection property specifies The name of the database connection, getPageData() method is used to query the data of the specified number of pages and the number of records displayed on each page.

Step 4: Use the paging query method
Call the paging query method of the model class in the controller or elsewhere to easily implement the paging query function.

The following is a sample code:

use appmodelUser;

// 创建User模型对象
$userModel = new User();

// 查询第1页，每页显示10条记录
$pageData = $userModel->getPageData(1, 10);

// 打印查询结果
print_r($pageData);

In the above code, we first create an instance object of the User model$userModel, and then call getPageData()Method, pass in the number of pages and the number of records per page to obtain the corresponding paging data.

Through the above four steps, we can easily use the thinkorm framework to implement the paging query function. Whether in website or application development, we can use this method to easily process large amounts of data and display it on the page.

Summary:
This article introduces how to use the thinkorm framework to easily implement the paging query function, and provides corresponding code examples. Using the thinkorm framework, we can quickly implement the database paging query function through simple configuration and calls, which greatly simplifies the development process. I hope this article will be helpful for everyone to understand the thinkorm framework and implement the paging query function.

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