Example analysis of how thinkphp modifies the database

ThinkPHP is an open source PHP framework based on the MVC model. It is an excellent PHP application development framework. Using ThinkPHP can help developers develop PHP applications more quickly, efficiently, and elegantly. When using ThinkPHP, you often encounter situations where you need to modify the database. Let us learn how to modify the database in ThinkPHP.

1. ThinkPHP database operation

In ThinkPHP, we can operate the database through the database operation classes it provides. Commonly used database operation classes are:

1. Db class

In ThinkPHP, we can use the Db class to perform operations such as adding, deleting, modifying, and querying the database. . Examples of its use are as follows:

<?php
use think\Db;

// 查询数据
$list = Db::table(&#39;user&#39;)->where('id', 1)->find();

// 新增数据
$data['name'] = 'test';
$data['age'] = 20;
Db::table('user')->insert($data);

// 更新数据
$where['id'] = 1;
$data['name'] = 'test';
$data['age'] = 30;
Db::table('user')->where($where)->update($data);

// 删除数据
$where['id'] = 1;
Db::table('user')->where($where)->delete();

2. Model class

In ThinkPHP, the Model class inherits from the Db class, so the Model class can use all methods of the Db class, and also Some more convenient methods are provided. Examples of its use are as follows:

<?php
namespace app\index\model;

use think\Model;

class User extends Model
{
    // 查询数据
    public function getUserById($id)
    {
        return $this->where('id', $id)->find();
    }

    // 更新数据
    public function updateUser($id, $name)
    {
        return $this->save(['name' => $name], ['id' => $id]);
    }
}

2. How to modify the database with ThinkPHP

When using ThinkPHP to modify the database, you usually go through the following steps:

1. Create a model

First, we need to create a model that corresponds to the database table we need to operate. Since ThinkPHP adopts the MVC design pattern, we need to inherit the Model class from ThinkPHP when creating the model. The following is an example of creating a User model:

<?php
namespace app\index\model;

use think\Model;

class User extends Model
{
    protected $table = &#39;user&#39;;
    protected $pk = &#39;id&#39;;
}

When creating the User model, we specified that the database table corresponding to the model is the user table, and the primary key of the table is id.

2. Instantiate the model

Next, we need to instantiate the User model we just created and use this model to operate the database. The following is an example of instantiating the User model:

<?php
$userModel = new \app\index\model\User();

3. Modify data

After instantiating the User model, we can use the methods provided by the model to modify the database edited. The following is an example of using the User model to modify data:

<?php
$userModel = new \app\index\model\User();

// 更新数据
$where['id'] = 1;
$data['name'] = 'test';
$data['age'] = 30;
$userModel->where($where)->update($data);

In the above example, we use the update() method of $UserModel to modify the data with id 1 in the User table, and change the row of data. Change the name field to test and the age field to 30.

3. Summary

ThinkPHP is a very excellent PHP framework, which provides many convenient and fast ways to operate the database. Through the introduction of the above article, we can learn how to modify the database in ThinkPHP. Hope this article is helpful to everyone.

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