vendor/topthink/think-orm/src/model/concern/Virtual.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\model\concern;

use think\db\BaseQuery as Query;
use think\db\exception\DbException as Exception;

/**
 * 虚拟模型
 */
trait Virtual
{
    /**
     * 获取当前模型的数据库查询对象
     * @access public
     * @param array $scope 设置不使用的全局查询范围
     * @return Query
     */
    public function db($scope = []): Query
    {
        throw new Exception('virtual model not support db query');
    }

    /**
     * 获取字段类型信息
     * @access public
     * @param string $field 字段名
     * @return string|null
     */
    public function getFieldType(string $field)
    {}

    /**
     * 保存当前数据对象
     * @access public
     * @param array  $data     数据
     * @param string $sequence 自增序列名
     * @return bool
     */
    public function save(array $data = [], string $sequence = null): bool
    {
        // 数据对象赋值
        $this->setAttrs($data);

        if ($this->isEmpty() || false === $this->trigger('BeforeWrite')) {
            return false;
        }

        // 写入回调
        $this->trigger('AfterWrite');