我用unsigned user_id创建了一个迁移。我如何编辑user_id在一个新的迁移,也使它为空()?

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();
}

当前回答

他是《Laravel 5》的完整迁移:

public function up()
{
    Schema::table('users', function (Blueprint $table) {
        $table->unsignedInteger('user_id')->nullable()->change();
    });
}

public function down()
{
    Schema::table('users', function (Blueprint $table) {
        $table->unsignedInteger('user_id')->nullable(false)->change();
    });
}

关键是,你可以通过传入false作为参数来移除nullable。

其他回答

注意,这只在Laravel 5+中是可能的。

首先,你需要doctrine/dbal包:

composer require doctrine/dbal

现在在你的迁移中,你可以这样做,使列为空:

public function up()
{
    Schema::table('users', function (Blueprint $table) {
        // change() tells the Schema builder that we are altering a table
        $table->integer('user_id')->unsigned()->nullable()->change();
    });
}

您可能想知道如何恢复此操作。遗憾的是,不支持这种语法:

// Sadly does not work :'(
$table->integer('user_id')->unsigned()->change();

这是恢复迁移的正确语法:

$table->integer('user_id')->unsigned()->nullable(false)->change();

或者,如果你喜欢,你可以写一个原始查询:

public function down()
{
    /* Make user_id un-nullable */
    DB::statement('UPDATE `users` SET `user_id` = 0 WHERE `user_id` IS NULL;');
    DB::statement('ALTER TABLE `users` MODIFY `user_id` INTEGER UNSIGNED NOT NULL;');
}

如果你碰巧改变了这些列

'Doctrine\DBAL\Driver\PDOMySql\Driver' not found

然后安装

作曲家需要学说

他是《Laravel 5》的完整迁移:

public function up()
{
    Schema::table('users', function (Blueprint $table) {
        $table->unsignedInteger('user_id')->nullable()->change();
    });
}

public function down()
{
    Schema::table('users', function (Blueprint $table) {
        $table->unsignedInteger('user_id')->nullable(false)->change();
    });
}

关键是,你可以通过传入false作为参数来移除nullable。

对于Laravel 4.2, Unnawut的答案是最好的。但如果使用表前缀,则需要稍微更改代码。

function up()
{
    $table_prefix = DB::getTablePrefix();
    DB::statement('ALTER TABLE `' . $table_prefix . 'throttle` MODIFY `user_id` INTEGER UNSIGNED NULL;');
}

为了确保您仍然可以回滚迁移,我们还将执行down()。

function down()
{
    $table_prefix = DB::getTablePrefix();
    DB::statement('ALTER TABLE `' . $table_prefix . 'throttle` MODIFY `user_id` INTEGER UNSIGNED NOT NULL;');
}

加上Dmitri Chebotarev的答案,Laravel 5+。

在要求doctrine/dbal包后:

composer require doctrine/dbal

然后你可以使用可空列进行迁移,如下所示:

public function up()
{
    Schema::table('users', function (Blueprint $table) {
        // change() tells the Schema builder that we are altering a table
        $table->integer('user_id')->unsigned()->nullable()->change();
    });
}

要恢复操作,请执行:

public function down()
{
    /* turn off foreign key checks for a moment */
    DB::statement('SET FOREIGN_KEY_CHECKS = 0');
    /* set null values to 0 first */
    DB::statement('UPDATE `users` SET `user_id` = 0 WHERE `user_id` IS NULL;');
    /* alter table */
    DB::statement('ALTER TABLE `users` MODIFY `user_id` INTEGER UNSIGNED NOT NULL;');
    /* finally turn foreign key checks back on */
    DB::statement('SET FOREIGN_KEY_CHECKS = 1');
}