Question

我有一个laravel项目，我不知道这里的错误在哪里。

我有一个产品表，其中包含＆＃34; low_stock_warning ＆＃34;整数字段和＆＃34; units_stock ＆＃34;整数字段。

我希望使用＆＃34; units_stock ＆＃34;小于＆＃34; low_stock_warning ＆＃34;，所以我有

$stock_warning = Product::whereRaw('units_stock <= low_stock_warning')
    ->select('id')
    ->get();

结果mysql是：

select `id` from `products` where units_stock <= low_stock_warning

如果我直接在我的数据库中执行它，我会得到一个产品。好的，但Eloquent告诉我， $ stock_warning 是一个空数组......

我在这里失踪了什么？

谢谢！

编辑1：

我试过了：

$stock_warning = Product::whereColumn('units_stock', '<=', 'low_stock_warning')->pluck('id');

print_r($stock_warning);

结果是：

Illuminate\Support\Collection Object ( [items:protected] => Array ( ) )

编辑2： 这是数据库结构：

--------------
DEVELOPMENT ENVIRONMENT
--------------
+-----------------------+------------------+------+-----+---------+----------------+
| Field                 | Type             | Null | Key | Default | Extra          |
+-----------------------+------------------+------+-----+---------+----------------+
| id                    | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| productdescriptioneng | text             | YES  |     | NULL    |                |
| units_stock           | int(11)          | YES  |     | NULL    |                |
| low_stock_warning     | int(11)          | YES  |     | NULL    |                |
+-----------------------+------------------+------+-----+---------+----------------+

--------------
PRODUCTION ENVIRONMENT
--------------
+-----------------------+------------------+------+-----+---------+----------------+
| Field                 | Type             | Null | Key | Default | Extra          |
+-----------------------+------------------+------+-----+---------+----------------+
| id                    | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| productdescriptioneng | text             | YES  |     | NULL    |                |
| units_stock           | int(11)          | YES  |     | NULL    |                |
| low_stock_warning     | int(11)          | YES  |     | NULL    |                |
+-----------------------+------------------+------+-----+---------+----------------+

开发： - 服务器版本：5.7.21 MySQL社区服务器（GPL）

SHOW ENGINES;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine             | Support | Comment                                                        | Transactions | XA   | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MEMORY             | YES     | Hash based, stored in memory, useful for temporary tables      | NO           | NO   | NO         |
| MRG_MYISAM         | YES     | Collection of identical MyISAM tables                          | NO           | NO   | NO         |
| CSV                | YES     | CSV storage engine                                             | NO           | NO   | NO         |
| BLACKHOLE          | YES     | /dev/null storage engine (anything you write to it disappears) | NO           | NO   | NO         |
| MyISAM             | YES     | MyISAM storage engine                                          | NO           | NO   | NO         |
| PERFORMANCE_SCHEMA | YES     | Performance Schema                                             | NO           | NO   | NO         |
| ARCHIVE            | YES     | Archive storage engine                                         | NO           | NO   | NO         |
| InnoDB             | DEFAULT | Supports transactions, row-level locking, and foreign keys     | YES          | YES  | YES        |
| FEDERATED          | NO      | Federated MySQL storage engine                                 | NULL         | NULL | NULL       |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+

生产： - 服务器版本：5.7.21-0ubuntu0.16.04.1（Ubuntu）

SHOW ENGINES;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine             | Support | Comment                                                        | Transactions | XA   | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MyISAM             | YES     | MyISAM storage engine                                          | NO           | NO   | NO         |
| MRG_MYISAM         | YES     | Collection of identical MyISAM tables                          | NO           | NO   | NO         |
| CSV                | YES     | CSV storage engine                                             | NO           | NO   | NO         |
| BLACKHOLE          | YES     | /dev/null storage engine (anything you write to it disappears) | NO           | NO   | NO         |
| PERFORMANCE_SCHEMA | YES     | Performance Schema                                             | NO           | NO   | NO         |
| InnoDB             | DEFAULT | Supports transactions, row-level locking, and foreign keys     | YES          | YES  | YES        |
| ARCHIVE            | YES     | Archive storage engine                                         | NO           | NO   | NO         |
| MEMORY             | YES     | Hash based, stored in memory, useful for temporary tables      | NO           | NO   | NO         |
| FEDERATED          | NO      | Federated MySQL storage engine                                 | NULL         | NULL | NULL       |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+

Answer 1

使用whereColumn()方法：

Product::whereColumn('units_stock', '<=', 'low_stock_warning')->pluck('id')

Answer 2

验证DB中的产品是否未被软删除（deleted_at不为空）; 如果它被软删除，但你需要它们使用它：

Product::whereColumn('units_stock', '<=', 'low_stock_warning')->withTrashed()->pluck('id');

Answer 3

您可以使用WhereColumn和orWhereColumn来实现。

Product::whereColumn('units_stock', '<', 'low_stock_warning')
         orWhereColumn('units_stock', '=', 'low_stock_warning')   
        ->pluck('id');

希望这有帮助

Laravel雄辩没有得到结果

3 个答案: