Question

我已经花了很多时间，但仍然无法使用外键改变我的迁移。我得到了

[Illuminate\Database\QueryException]                                                 
  SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your S  
  QL syntax; check the manual that corresponds to your MySQL server version for the r  
  ight syntax to use near '1' at line 1 (SQL: alter table `posts` add constraint post  
  s_author_foreign foreign key (`author`) references `users` (`id`) on delete 1)

我尝试迁移的类看起来像

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreatePostsTable extends Migration {

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up() {
        if (!Schema::hasTable('posts')) {
            Schema::create('posts', function($table) {

                $table->engine = 'InnoDB';

                $table->increments('id');
                $table->string('title', 255);
                $table->string('slug', 255);
                $table->unique('slug');
                $table->string('type', 255);
                $table->text('content');
                $table->integer('parent');
                $table->integer('author')->unsigned();
                $table->string('avatar', 255);
                $table->string('guid', 255);
                $table->string('mime_type', 255);
                $table->integer('menu_order');
                $table->boolean('status');
                $table->index('id');
                $table->timestamps();
            });

            Schema::table('posts', function($table) {
                $table->foreign('author')->references('id')->on('users')->onDelete();
            });

        }
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down() {
        Schema::drop('posts');
    }

}

我的迁移有什么问题？

Answer 1

错误说明了一切。

也许你想要这个：

$table->foreign('author')->references('id')->on('users')->onDelete();

是：

$table->foreign('author')->references('id')->on('users')->onDelete('cascade');

或者简单地说：

$table->foreign('author')->references('id')->on('users');

请参阅文档here。

使用外键的Laravel迁移会丢失1064错误

1 个答案: