Laravel迁移更改以使列为空 [英] Laravel Migration Change to Make a Column Nullable

问题描述

我使用未签名的user_id创建了迁移.如何在新迁移中编辑user_id使其也成为nullable()?

I created a migration with unsigned user_id. How can I edit user_id in a new migration to also make it nullable()?

Schema::create('throttle', function(Blueprint $table)
{
    $table->increments('id');
    // this needs to also be nullable, how should the next migration be?
    $table->integer('user_id')->unsigned();
}

推荐答案

Laravel 5现在支持更改列；这是官方文档中的示例:

Laravel 5 now supports changing a column; here's an example from the offical documentation:

Schema::table('users', function($table)
{
    $table->string('name', 50)->nullable()->change();
});

来源: http://laravel.com/docs/5.0/schema#changing-列

Laravel 4不支持修改列，因此您需要使用另一种技术，例如编写原始SQL命令.例如:

Laravel 4 does not support modifying columns, so you'll need use another technique such as writing a raw SQL command. For example:

// getting Laravel App Instance
$app = app();

// getting laravel main version
$laravelVer = explode('.',$app::VERSION);

switch ($laravelVer[0]) {

    // Laravel 4
    case('4'):

        DB::statement('ALTER TABLE `pro_categories_langs` MODIFY `name` VARCHAR(100) NULL;');
        break;

    // Laravel 5, or Laravel 6
    default:                

        Schema::table('pro_categories_langs', function(Blueprint $t) {
            $t->string('name', 100)->nullable()->change();
        });               

}

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