[英]laravel migration SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint
[英]Laravel 8 Migration “General error: 1215 Cannot add foreign key constraint”
我正在尝试在 Laravel 8 上创建迁移,这是我的表
class CreateProductVariationOrderTable extends Migration {
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('product_variation_order', function (Blueprint $table) {
$table->integer('order_id')->unsigned()->index();
$table->integer('product_variation_id')->unsigned()->index();
$table->integer('quantity')->unsigned();
$table->timestamps();
$table->foreign('order_id')->references('id')->on('orders')->onDelete('cascade');
$table->foreign('product_variation_id')->references('id')->on('product_variations')->onDelete('cascade');
});
}
public function down()
{
Schema::dropIfExists('product_variation_order');
}
}
当我运行php artisan migrate
时,我得到了这块错误: SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint (SQL: alter table
product_variation_order add constraint
product_variation_order_order_id_foreign foreign key (
order_id ) on delete cascade)
) references
订单(
id ) ) on delete cascade)
⚠️ 编辑:这是我的product_variation
迁移文件。
class CreateProductVariationsTable extends Migration {
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('product_variations', function (Blueprint $table) {
$table->increments('id');
$table->integer('product_id')->unsigned()->index();
$table->string('name');
$table->integer('price')->nullable();
$table->integer('order')->nullable();
$table->timestamps();
$table->foreign('product_id')->references('id')->on('products');
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('product_variations');
}
}
外键必须与引用键的类型相同。
在您的订单表中,您将 id 定义为bigIncrements()
,它是 unsigned big integer。
在您的 product_variation_order 表中,您将 order_id 定义为无符号 integer。
所以这两个键不匹配。 通常你应该使用大 integer 因为它允许你的数据库变得更大并且 integer 和大 integer 之间的空间差异并不显着。
所以将order_id
更改为 unsigned big integer。
$table->unsignedBigInteger('order_id')->nullable();
同样为了一致性,所有的键都应该是bigIncrements()
或unsignedBigInteger()
,这会让你以后头疼。
使用此代码:
产品变体:
class CreateProductVariationsTable extends Migration {
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('product_variations', function (Blueprint $table) {
$table->increments('id');
$table->bigInteger('product_id')->unsigned()->nullable();
$table->string('name');
$table->integer('price')->nullable();
$table->integer('order')->nullable();
$table->timestamps();
$table->foreign('product_id')->references('id')->on('products');
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('product_variations');
}
}
product_variation_order:
class CreateProductVariationOrderTable extends Migration {
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('product_variation_order', function (Blueprint $table) {
$table->bigInteger('order_id')->unsigned()->nullable();
$table->bigInteger('product_variation_id')->unsigned()->nullable();
$table->integer('quantity')->unsigned();
$table->timestamps();
$table->foreign('order_id')->references('id')->on('orders')->onDelete('cascade');
$table->foreign('product_variation_id')->references('id')->on('product_variations')->onDelete('cascade');
});
}
public function down()
{
Schema::dropIfExists('product_variation_order');
}
}
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