thinkphp/library/think/Model.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think;

use InvalidArgumentException;
use think\db\Query;

/**
 * Class Model
 * @package think
 * @mixin Query
 * @method Query where(mixed $field, string $op = null, mixed $condition = null) static 查询条件
 * @method Query whereRaw(string $where, array $bind = []) static 表达式查询
 * @method Query whereExp(string $field, string $condition, array $bind = []) static 字段表达式查询
 * @method Query when(mixed $condition, mixed $query, mixed $otherwise = null) static 条件查询
 * @method Query join(mixed $join, mixed $condition = null, string $type = 'INNER') static JOIN查询
 * @method Query view(mixed $join, mixed $field = null, mixed $on = null, string $type = 'INNER') static 视图查询
 * @method Query with(mixed $with) static 关联预载入
 * @method Query count(string $field) static Count统计查询
 * @method Query min(string $field) static Min统计查询
 * @method Query max(string $field) static Max统计查询
 * @method Query sum(string $field) static SUM统计查询
 * @method Query avg(string $field) static Avg统计查询
 * @method Query field(mixed $field, boolean $except = false) static 指定查询字段
 * @method Query fieldRaw(string $field, array $bind = []) static 指定查询字段
 * @method Query union(mixed $union, boolean $all = false) static UNION查询
 * @method Query limit(mixed $offset, integer $length = null) static 查询LIMIT
 * @method Query order(mixed $field, string $order = null) static 查询ORDER
 * @method Query orderRaw(string $field, array $bind = []) static 查询ORDER
 * @method Query cache(mixed $key = null , integer $expire = null) static 设置查询缓存
 * @method mixed value(string $field) static 获取某个字段的值
 * @method array column(string $field, string $key = '') static 获取某个列的值
 * @method mixed find(mixed $data = null) static 查询单个记录
 * @method mixed select(mixed $data = null) static 查询多个记录
 * @method mixed get(mixed $data = null,mixed $with =[],bool $cache= false) static 查询单个记录 支持关联预载入
 * @method mixed getOrFail(mixed $data = null,mixed $with =[],bool $cache= false) static 查询单个记录 不存在则抛出异常
 * @method mixed findOrEmpty(mixed $data = null,mixed $with =[],bool $cache= false) static 查询单个记录  不存在则返回空模型
 * @method mixed all(mixed $data = null,mixed $with =[],bool $cache= false) static 查询多个记录 支持关联预载入
 * @method \think\Model withAttr(array $name,\Closure $closure) 动态定义获取器
 */
abstract class Model implements \JsonSerializable, \ArrayAccess
{
    use model\concern\Attribute;
    use model\concern\RelationShip;
    use model\concern\ModelEvent;
    use model\concern\TimeStamp;
    use model\concern\Conversion;

    /**
     * 是否存在数据
     * @var bool

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