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

我只是把这个答案加在这里，因为这对我来说是最快的解决方法。只需要将默认的数据库引擎设置为'InnoDB'

/ config / database.php

'mysql' => [
    ...,
    ...,
    'engine' => 'InnoDB',
 ]

然后运行PHP artisan config:cache来清除和刷新配置缓存

编辑: 这里找到的答案可能解释了这一事件背后的原因

首先删除本地主机中数据库的所有表

更改Laravel默认数据库(utf8mb4)在config/database.php文件中的属性为:

'charset' => 'utf8'， 'collation' => 'utf8_unicode_ci'，

之后 更改我的本地数据库属性utf8_unicode_ci。 PHP工匠迁移 没关系。

我已经解决了这个问题，并编辑我的config->database.php文件喜欢我的数据库('charset'=>'utf8')和('collation'=>'utf8_general_ci')，所以我的问题解决了如下代码:

'mysql' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_DATABASE', 'forge'),
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8',
        'collation' => 'utf8_general_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],

模式:defaultStringLength (191);将默认定义所有字符串191的长度，这可能会破坏您的数据库。你不能走这条路。

只需在数据库迁移类中定义任何特定列的长度。例如，我在CreateUsersTable类中定义了“name”，“username”和“email”，如下所示:

public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name', 191);
            $table->string('username', 30)->unique();
            $table->string('email', 191)->unique();
            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });
    }

需要使用以下命令创建数据库。

CREATE DATABASE database_name CHARACTER SET utf8 COLLATE utf8_general_ci;

然后运行以下命令迁移数据库表。

php artisan migrate