How to customize a Model? Usage of ThinkPHP3.2 custom base class Model

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ThinkPHP provides a Model class for other Models to inherit. The Model class is the model class in MVC, which is the upper class that calls the persistence layer. It feels like there are a lot of problems with this description, but what can be done? However, this Model sometimes cannot meet some of our needs, so we need to customize a Model class. However, the customized Model must also inherit the Model class provided by TP, and use our customized Model class as the Model in our project. Base class. Why do I feel like I'm talking about tongue twisters, etc... I'm a little dizzy.

Boring requirements

When using the Java open source project JeeSite, I developed a bad habit of adding create_by, create_date, update_by, update_date, remarks and del_flag has several fields. If each table has these fields, then the above fields will be set when inserting each table, some of the fields will be updated when updating each table, and each record will be deleted when deleting. In fact, the del_flag field is set. There are many repeated operations, and some operation methods have been modified. Then, at this time, you need to customize your own Model as the base class of the project. This Model will be responsible for doing the things I mentioned above.

Customize a Model

Customize a Model. In the Model, at least re-implement the add, save, delete and select methods in the Model provided by TP.

The definition code is as follows:

<?php
namespace Admin\Model;
use Think\Model;

/**
 * 项目中其他 Model 类的基类
 * 该类继承自 TP 提供的基类 Model
 */
class BaseModel extends Model {
    
    /**
     * 继承基类 Model 的 add 方法
     * 自动插入 id create_by create_date update_by update_date del_flag
     */
    public function add($data=&#39;&#39;,$options=array(),$replace=false) {
        
        $data["id"]          = $this->getUuid();
        $data["create_by"]   = "";
        $data["create_date"] = date("Y-m-d H:i:s");
        $data["update_by"]   = "";
        $data["update_date"] = date("Y-m-d H:i:s");
        $data["del_flag"]    = &#39;0&#39;;
        
        return parent::add($data, $options, $replace);
    }
    
    /**
     * 获得 未删除 的所有数据
     * 记录是否被删除通过 del_flag 字段来进行确定
     */
    public function select($options=array()) {
        $map["del_flag"] = 0;
        $this->where($map);
        
        return parent::select($options);
    }
    
    /**
     * 获取 全部 的所有数据
     */
    public function selectAll($options=array()) {
        return parent::select($options);
    }
    
    /**
     * 更新数据
     * 更新数据时，要更新 update_by update_date 两个字段
     */
    public function save($data=&#39;&#39;,$options=array()) {
        $data["update_by"]   = "";
        $data["update_date"] = date("Y-m-d H:i:s");
        
        return parent::save($data, $options);
    }
    
    /**
     * 删除也是更新
     * 设置 删除 标志位即可
     */
    public function delete($data=&#39;&#39;,$options=array()) {
        $data["del_flag"] = 1;
        
        return parent::save($data, $options);
    }

In this way, our BaseModel is defined, and the Model in the future project will no longer inherit TP. Model class, but inherits our custom BaseModel.

Inherit the base class we defined

The method of inheriting BaseModel is the same as the method of inheriting Model, except that when using use to introduce the namespace to the current scope, it needs to be modified to our naming space instead of using the namespace provided by TP. The code is as follows:

1 <?php
2 namespace Admin\Model;
3 use Admin\Model\BaseModel;
4 
5 class TrunkModel extends BaseModel {

use The namespace introduced is Admin\Model\BaseModel, because the namespace of the BaseModel we defined is Admin\Model, because here TrunkModel and BaseModel are in the same namespace, so it is okay to omit use.

In this way, after we use the D method to instantiate the TrunkModel object, when using the add method to insert data, the add method in BaseModel will be called first, so that each of our tables has a series of create_by and so on. The fields will be automatically obtained.

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