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
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');
}
其他回答
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');
}
再加上德米特里·切波塔列夫的回答，
如果你想一次修改多个列，你可以像下面这样做
DB::statement('
ALTER TABLE `events`
MODIFY `event_date` DATE NOT NULL,
MODIFY `event_start_time` TIME NOT NULL,
MODIFY `event_end_time` TIME NOT NULL;
');
您需要首先安装doctrine/dbal包。
composer require doctrine/dbal
然后使用change()方法 例如:
Schema::table('posts', function (Blueprint $table) {
$table->unsignedBigInteger('user_id')->nullable()->change();
});
我必须使用nullable(true)
Schema::table('users', function($table)
{
$table->string('name', 50)->nullable(true)->change();
});
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。
