How to query data using ThinkPHP5 framework

ThinkPHP5 is a PHP framework based on the MVC model, with rich functions and flexible usage. In the ThinkPHP5 framework, querying data is one of the most important operations. In this article, we will introduce how to query data using the ThinkPHP5 framework.

1. Use the Model class to query data

The Model class is the core class used to operate the database in the ThinkPHP5 framework. When using the Model class to query data, we need to first define an instantiated Model class. Object. As shown below:

use think\Model;
class User extends Model
{
    //定义User表，并设置为默认表名
    protected $table = 'user';
}

After defining the Model class, we can query the database through the Model class, as shown below:

//查询所有User表中的数据
$user = new User;
$result = $user->select();
var_dump($result);

2. Use the Db class to query data

In addition to using the Model class for data query, we can also use the Db class provided by the ThinkPHP5 framework for data query. The Db class encapsulates the underlying PDO operations, allowing us to perform database operations more conveniently.

When using the Db class to query data, we need to introduce the Db class first and define a query condition. As shown below:

//引入Db类
use think\Db;
//定义查询条件
$where['id'] = 1;
//查询User表中id=1的数据
$result = Db::table('user')->where($where)->find();
var_dump($result);

3. Use the Query class to query data

In addition to using the Model class and Db class for data query, we can also use the Query class provided by the ThinkPHP5 framework for data query. The Query class is a low-level queryer that can perform complete query operations on the database.

When using the Query class to query data, we need to introduce the Query class first and define a query condition. As shown below:

//引入Query类
use think\db\Query;
//定义查询条件
$where['id'] = 1;
//查询User表中id=1的数据
$result = (new Query())->table('user')->where($where)->find();
var_dump($result);

Summary: The above is the method of using the ThinkPHP5 framework for database query. Through these simple code examples, we can master the methods and techniques of querying data in the ThinkPHP5 framework, so as to achieve more efficient Database operations.

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