Take you to learn the addition, deletion, modification and query of the database in TP5

When developing web applications, database operations are essential. As web applications gradually grow, the amount of data continues to increase, so the efficiency and accuracy of database operations become particularly important. The most widely used database operation framework in PHP development is TP5. Below we will use several examples to learn how to use database addition, deletion, modification and query in TP5.

1. Link to the database

Linking to the database in TP5 is very simple. You only need to modify the configuration file. Open the database.php file in the config directory and modify the following code:

// 默认使用的数据库配置
return [
    // 数据库类型
    'type'        => 'mysql',
    // 服务器地址
    'hostname'    => 'localhost',
    // 数据库名
    'database'    => 'test',
    // 数据库用户名
    'username'    => 'root',
    // 数据库密码
    'password'    => '',
    // 数据库编码默认采用utf8
    'charset'     => 'utf8',
];

2. Add data

The steps to use TP5 to add data to the database include creating models, setting data, and adding data. We can use the command framework to automatically create the corresponding model. The command is as follows:

php think make:model User

After the creation is completed, we can open the app\model\User.php file under the project and see that an empty model is generated by default. Class:

<?php namespace app\model;
use think\Model;

class User extends Model
{
}

Next, we need to set the data and add it to the database. The code is as follows:

use app\model\User;

// 创建一个模型对象
$user = new User;

// 设置数据
$user->name = 'Tom';
$user->age = 18;

// 添加到数据库中
$user->save();

echo '添加成功';

save() method will write the data into the database table and return a bool type The return value.

3. Modify data

To modify the data in the database, we can first obtain the specified data through the get() method of the model class, modify the corresponding attributes, and then use save() method is saved to the database. The code is as follows:

use app\model\User;

// 获取指定ID的数据
$user = User::get(1);

// 修改数据
$user->name = 'Jerry';
$user->save();

echo '修改成功';

4. Deleting data

Deleting data can be achieved through the model’s delete() method. The code is as follows:

use app\model\User;

// 根据ID获取模型对象
$user = User::get(1);

// 删除数据
$user->delete();

echo '删除成功';

You can also use the model’s destroy() Method to delete multiple records, the code is as follows:

use app\model\User;

// 删除多条数据
User::destroy([1,2,3]);

echo '删除成功';

5. Query data

TP5 query supports chain operations, which greatly facilitates our query and provides us with a large number of query method. Here are some examples:

1. Query a single record

use app\model\User;

$user = User::where('id',1)->find();
echo $user->name;

2. Query multiple pieces of data

use app\model\User;

$data = User::where('status',1)->select();
foreach ($data as $user) {
    echo $user->name.'<br>';
}

3. Use native SQL query

use think\Db;

$result = Db::query('SELECT * FROM USER WHERE id=?',[1]);
var_dump($result);

Again Remind everyone that TP5 queries support chain operations. Generally, we can use chain operations to combine as complex query statements as possible, thereby reducing memory and I/O overhead.

TP5’s database operation is very powerful and convenient. As long as you master some basic knowledge, you can start to operate the database happily!

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