是否可以更改表在 Laravel 中的迁移顺序？

Question

我正在尝试迁移我新创建的迁移。问题是等待迁移的那批迁移是按照我使用

创建迁移的顺序排列的

php artisan make:migration

因此，我的 product_list 迁移试图在尚未迁移的 table 上设置外键。

$table->foreign('product_category')->references('id')->on('product_categories');
$table->foreign('product_type')->references('id')->on('product_types')->onDelete('cascade');

当我运行 php artisan migrate 我得到这些错误：

C:\xampp\htdocs\iezonsolutions>php artisan migrate
Migrating: 2019_01_15_001617_product_list

   Illuminate\Database\QueryException  : SQLSTATE[HY000]: General error: 1005 Can't create table `iezonsolutions`.`#sql-1844_16e` (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table `product_list` add constraint `product_list_product_category_foreign` foreign key (`product_category`) references `product_categories` (`id`))

  at C:\xampp\htdocs\iezonsolutions\vendor\laravel\framework\src\Illuminate\Database\Connection.php:664
    660|         // If an exception occurs when attempting to run a query, we'll format the error
    661|         // message to include the bindings with SQL, which will make this exception a
    662|         // lot more helpful to the developer instead of just the database's errors.
    663|         catch (Exception $e) {
  > 664|             throw new QueryException(
    665|                 $query, $this->prepareBindings($bindings), $e
    666|             );
    667|         }
    668|

  Exception trace:

  1   PDOException::("SQLSTATE[HY000]: General error: 1005 Can't create table `iezonsolutions`.`#sql-1844_16e` (errno: 150 "Foreign key constraint is incorrectly formed")")
      C:\xampp\htdocs\iezonsolutions\vendor\laravel\framework\src\Illuminate\Database\Connection.php:458

  2   PDOStatement::execute()
      C:\xampp\htdocs\iezonsolutions\vendor\laravel\framework\src\Illuminate\Database\Connection.php:458

  Please use the argument -v to see more details.

是否可以在 product_list table 之前迁移我的 product_category 和 product_types table？这样我就可以不出错地设置外键了。

我的迁移状态如下所示：

+------+------------------------------------------------+-------+
| Ran? | Migration                                      | Batch |
+------+------------------------------------------------+-------+
| Yes  | 2014_10_12_000000_create_users_table           | 1     |
| Yes  | 2014_10_12_100000_create_password_resets_table | 1     |
| Yes  | 2019_01_14_203800_server_mode                  | 2     |
| No   | 2019_01_15_001617_product_list                 |       |
| No   | 2019_01_15_002318_product_types                |       |
| No   | 2019_01_15_002336_product_categories           |       |
| No   | 2019_01_15_002357_product_skus                 |       |
+------+------------------------------------------------+-------+

我希望它按顺序迁移

| No   | 2019_01_15_002336_product_categories           |       |
| No   | 2019_01_15_002318_product_types                |       |
| No   | 2019_01_15_001617_product_list                 |       |
| No   | 2019_01_15_002357_product_skus                 |       |
+------+------------------------------------------------+-------+

Answer 1

您可以做的最简单的事情是在文件名上排序日期和时间，最后是 laravel 以按顺序迁移数据库。

Answer 2

将迁移文件的名称更改为比您希望运行更早的日期时间

所以将文件名改为例如

2019_01_15_00000_product_categories

Answer 3

手动更改时间戳，这样您要首先迁移的文件的文件名应该比您要稍后迁移的文件更早timestamp/date。

Changing Migration Order

是否可以更改表在 Laravel 中的迁移顺序？

Is it possible to change the order in which tables migrate in Laravel?

php

database-migration

laravel

laravel-5

laravel-artisan