这是我的车辆表。我想通过迁移更改我的数据库结构
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateVehiclesTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('vehicles', function (Blueprint $table) {
$table->increments('id');
$table->string('image')->nullable();
$table->string('reg_no')->unique();
$table->string('fuel_type');
$table->string('capacity');
$table->double('rate');
$table->boolean('req_carrier');
$table->date('service_date');
$table->integer('service_freq_km');
$table->integer('service_freq_months');
$table->date('insurance_date');
$table->integer('insurance_freq_months');
$table->date('eco_date');
$table->integer('eco_freq_months');
$table->date('licence_date');
$table->integer('licence_freq_months');
$table->integer('current_company');
$table->string('status')->default("available");
$table->timestampsTz();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('vehicles');
}
}
我想为这些列提供可为空的值。 1.服务日期 2.service_freq_km 3.service_freq_months
如何在 mysql 中将这些列更改为可为空?
最佳答案
您可以阅读有关 Modifying Columns
的文档.
如果你想要这些功能,你需要先安装这个包:
composer require doctrine/dbal
然后,您需要创建另一个迁移,例如:
2019_10_24_xxxxxx_change_columns_to_nullable_in_vehicles.php
<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
class ChangeColumnsToNullableInVehicles extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::table('vehicles', function (Blueprint $table) {
$table->date('service_date')->nullable()->change();
$table->integer('service_freq_km')->nullable()->change();
$table->integer('service_freq_months')->nullable()->change();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::table('vehicles', function (Blueprint $table) {
$table->date('service_date')->nullable(false)->change();
$table->integer('service_freq_km')->nullable(false)->change();
$table->integer('service_freq_months')->nullable(false)->change();
});
}
}
关于mysql - 如何在 mysql 中使用 laravel 迁移将数据库列 'null' 更改为 'nullable'?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58535757/