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();
}
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;');
}
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');
}