腔:

添加到。env文件

DB_ENGINE=InnoDB

对于不想更改AppServiceProvider.php的人。 (在我看来，仅仅为了迁移而更改AppServiceProvider.php是一个坏主意)

您可以将数据长度添加回database/migrations/下的迁移文件，如下所示:

create_users_table.php

$table->string('name',64);
$table->string('email',128)->unique();

create_password_resets_table.php

$table->string('email',128)->index();

这很常见，因为Laravel 5.4将默认数据库字符集更改为utf8mb4。你要做的是:编辑你的App\Providers.php，把这段代码放在类声明之前

use Illuminate\Support\Facades\Schema;

另外，将此添加到'boot'功能 模式:defaultStringLength (191);

如前所述，我们在App/Providers中添加到AppServiceProvider.php

use Illuminate\Support\Facades\Schema;  // add this

/**
 * Bootstrap any application services.
 *
 * @return void
 */
public function boot()
{
    Schema::defaultStringLength(191); // also this line
}

你可以在下面的链接中看到更多细节(搜索“索引长度& MySQL / MariaDB”) https://laravel.com/docs/5.5/migrations

BUT WELL THAT's not what I published all about! the thing is even when doing the above you will likely to get another error (that's when you run php artisan migrate command and because of the problem of the length, the operation will likely stuck in the middle. solution is below, and the user table is likely created without the rest or not totally correctly) we need to roll back. the default roll back will not work. because the operation of migration didn't like finish. you need to delete the new created tables in the database manually.

我们可以这样做使用修补器如下所示:

L:\todos> php artisan tinker

Psy Shell v0.8.15 (PHP 7.1.10 — cli) by Justin Hileman

>>> Schema::drop('users')

=> null

我自己有一个问题与用户表。

之后你就可以开始了

PHP artisan migrate:回滚

PHP工匠迁移

对于这个错误，我找到了两个解决方案

选项1:

打开database/migrations文件夹下的user和password_reset表

只需要改变邮件的长度:

$table->string('email',191)->unique();

选项2:

打开app/Providers/AppServiceProvider.php文件，在boot()方法中设置一个默认字符串长度:

use Illuminate\Support\Facades\Schema;

public function boot()
{
    Schema::defaultStringLength(191);
}

这里的方法是传递一个带有键名的第二个参数(一个短参数):

$table->string('my_field_name')->unique(null,'key_name');