Let's talk about several methods of sorting in ThinkPHP

When using the ThinkPHP framework, we often need to sort query results to facilitate our browsing and management of data. This article will introduce several methods of sorting in ThinkPHP.

1. Sort using Select

In ThinkPHP, we can use the select method to sort the query results. There are two ways to use the select method, one is to use string concatenation and sorting conditions, and the other is to use an array.

1. Use string concatenation sorting conditions

For example, we need to sort students from high to low according to their grades:

$student = M('student')->order('score desc')->select();

The order method is used to specify the sorting conditions , score represents the score field, desc represents the descending order, and asc represents the ascending order.

2. Use array sorting

Using array method can more conveniently combine multiple sorting conditions, for example:

$order = [
    'score desc',
    'age asc'
];
$student = M('student')->order($order)->select();

The above code will first sort the results in descending order. If the results If they are the same, they are arranged in ascending order of age.

2. Sort using Model

In addition to sorting using the Select method, we can also define sorting rules in the Model.

In Model, we can use the protected $order member variable to specify the default sorting method. For example:

class StudentModel extends Model {
    protected $order = 'score desc';
}

The above code will automatically sort the students according to their scores from high to low when querying.

If we need more sorting rules, we can use the sort method. The sort method accepts a string or array parameter to specify the sorting rule:

$student = new StudentModel();
$order = [
    'score desc',
    'age asc'
];
$student->sort($order)->select();

The above code will first sort by grades in descending order, and if the grades are the same, sort by age in ascending order.

3. Sort using Query

Query is the query object in ThinkPHP. We can also use Query object to implement sorting:

$query = new Query();
$student = $query->table('student')->order('score desc')->select();

The above code is the same as using Select, except Query object is used.

4. Use Db to sort

Db is the database operation class in ThinkPHP. We can also use Db to sort:

use think\Db;

$student = Db::name('student')->order('score desc')->select();

The above code is the same as using Select, just use Db class.

Summary

The above are several methods of sorting in ThinkPHP. Sorting can be simpler and more convenient using the Select and Model methods, while the Query and Db methods are more comprehensive and flexible. You can choose different ways to sort according to the specific situation.

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