ThinkPHP is an open source PHP application framework that is widely used in Web application development and management. When developing using the ThinkPHP framework, obtaining data is a very important step. This article will introduce some methods and techniques for obtaining data in ThinkPHP.

1. Use models to obtain data

ThinkPHP provides a very convenient way to obtain data in the database, that is, using models. A model is a class used to operate the database. Through the model class, data can be added, deleted, modified, and checked easily.

When using a model to obtain data, we need to first create a model class, and then call the method of the model class in the controller to obtain the data. The following is a simple example:

First, create a model class in the project directory, such as BookModel.class.php.

<?php
namespace Home\Model;
use Think\Model;
class BookModel extends Model {
    //定義一些模型操作方法
}

Then, call the method of the model class in the controller to get the data.

<?php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
    public function index() {
        $bookModel = M("Book"); //實(shí)例化模型類(lèi)
        $data = $bookModel->select();?//調(diào)用模型類(lèi)中的select方法
????????$this->assign("data",?$data);?//將獲取的數(shù)據(jù)分配到視圖文件中
????????$this->display();?//顯示視圖文件
????}
}

In the above code, we first instantiate a Book model class in the controller, then obtain all the data in the database by calling the select method, and distribute the data to the view file. Finally, call the display method to display the view file.

2. Use the query builder to get data

In addition to using the model to get data, you can also use the query builder to get data. Query builder is a class used to build SQL statements and can create and execute SELECT, INSERT, UPDATE and DELETE functional SQL queries.

The following is an example of using the query builder to obtain data:

<?php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
    public function index() {
        $data = M("Book")->where("id?>?10")->select();?//使用查詢(xún)構(gòu)造器獲取數(shù)據(jù)
????????$this->assign("data",?$data);?//將獲取的數(shù)據(jù)分配到視圖文件中
????????$this->display();?//顯示視圖文件
????}
}

In the above code, we create a WHERE conditional statement by calling the where method on the model, and then call the select method. Execute the query and distribute the results to the view file.

3. Use native SQL to obtain data

In addition to using the model and query builder to obtain data, you can also use native SQL queries to obtain data. Native SQL queries refer to real SQL statements written that can be run directly in the database to obtain data.

The following is an example of using native SQL to obtain data:

<?php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
    public function index() {
        $data = M()->query("SELECT?*?FROM?book?WHERE?id?>?10");?//使用原生SQL獲取數(shù)據(jù)
????????$this->assign("data",?$data);?//將獲取的數(shù)據(jù)分配到視圖文件中
????????$this->display();?//顯示視圖文件
????}
}

In the above code, we execute the native SQL query by calling the query method on the model and distribute the results to the view file go.

Summary:

When developing using the ThinkPHP framework, obtaining data is a very important step. The above article introduces three commonly used methods to obtain data, namely using models, query builders and native SQL. Different methods have different advantages and disadvantages in different situations. We need to choose the most suitable method to obtain data according to the actual situation.

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