[英]Laravel Database Foreign Key Constraints not working
我是 Laravel 的初學者,我想我可能錯過了一些非常重要的東西。
我正在嘗試將外鍵約束放入我的數據庫中。 我試圖遷移我的工作(php artisan migrate),它進入數據庫。
但是,當我想在 mysql 上查看主鍵和外鍵之間的“連接”時,什么也沒有出現。
當我通過添加文章和標簽進行測試時,我可以在數據庫中添加錯誤的 ID。
標記表:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateTagTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('tag', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->timestamps();
$table->softDeletes();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('tag');
}
}
文章表:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateArticleTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('article', function (Blueprint $table) {
$table->increments('id');
$table->string('title');
$table->longText('description');
$table->longText('content');
$table->timestamps();
$table->softDeletes();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('article');
}
}
文章標簽表:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateArticleTagTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('article_tag', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('article_id');
$table->unsignedInteger('tag_id');
});
Schema::table('article_tag', function($table){
$table->foreign('article_id')->references('id')->on('article');
$table->foreign('tag_id')->references('id')->on('tag');
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('article_tag');
}
}
表 article_tag 不應與 ID 1 和 ID 3 一起使用。
謝謝你的幫助!
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateArticleTagTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('article_tag', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('article_id');
$table->unsignedInteger('tag_id');
});
$table->foreign('article_id')->references('id')->on('article');
$table->foreign('tag_id')->references('id')->on('tag');
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('article_tag');
}
}
更新數據庫配置並將引擎值設置為 InnoDB
配置 > 數據庫.php
'engine' => 'InnoDB',
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