ThinkPHP is an open source PHP development framework that integrates a rich set of functions and class libraries, greatly improving the efficiency of PHP development. In application development, querying data sets is a frequently used operation. Next, we will introduce how to implement querying data sets in ThinkPHP.

1. Basic query

First, we need to define the table name to be queried in the model, and call the model method in the controller to query. For example, we have a user table (User), and we need to query all records in the user table:

//?User模型定義
namespace?app\common\model;
use?think\Model;
class?User?extends?Model
{
????protected?$table?=?'User';
}

//?控制器中查詢所有用戶記錄
namespace?app\index\controller;
use?app\common\model\User;
class?Index
{
????public?function?index()
????{
????????$User?=?new?User();
????????$userList?=?$User->select();
????????return?json($userList);
????}
}

There are several points to note here:

1. Define the table in the model When naming, you can omit the prefix, and you can also add the complete table name.
2. When instantiating a model in a controller, you need to use use to introduce the model class.
3. The select() method returns an array containing the queried data set.

2. Query conditions

If we need to query the data set under specific conditions, we can use the where() method to filter. For example, we need to query all user records whose gender is female:

//?控制器中回去性別為女性的用戶記錄
public?function?index()
{
????$User?=?new?User();
????$userList?=?$User->where('sex',?'女')->select();
????return?json($userList);
}

The where() method here will automatically add a WHERE clause, and chain operations can be used to filter multiple conditions.

3. Sorting

When querying the data set, we can use the order() method to sort the results. For example, sort by age from smallest to largest:

//?控制器中按照年齡從小到大對結果進行排序
public?function?index()
{
????$User?=?new?User();
????$userList?=?$User->order('age?asc')->select();
????return?json($userList);
}

The asc parameter here indicates ascending order. If you need to sort in descending order, use the desc parameter.

4. Paging

When the data set we query is very large, paging operation is required. ThinkPHP provides a convenient paging function paginate(), which can be applied to chain operations of all query methods. For example, each page displays 10 user records:

//?控制器中每頁展示10個用戶記錄
public?function?index()
{
????$User?=?new?User();
????$userList?=?$User->paginate(10);
????return?json($userList);
}

Closed Language

Querying data sets is a very important part of web application development, and the query method provided by the ThinkPHP framework is highly flexible. and scalability, which is very practical in actual development. Hope this article can be helpful to everyone.

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