php - MySQL/Laravel 外键约束格式不正确

Question

我正在尝试运行 php artisan migrate 以使用 laravel 创建我的 mysql 表。

我收到此错误: 外键约束格式不正确

用户表:

Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('street');
            $table->string('city');
            $table->string('phone');
            $table->string('email')->unique();
            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });

password_resets 表:

Schema::create('password_resets', function (Blueprint $table) {
            $table->string('email')->index();
            $table->string('token');
            $table->timestamp('created_at')->nullable();
        });

产品表:

 Schema::create('products', function (Blueprint $table) {
            $table->increments('id');
            $table->string('product_type');
            $table->integer('quantity');
            $table->timestamps();
        });

出货量表:

  Schema::create('shipments', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('order_number')->unsigned();
        $table->integer('product_id')->unsigned();
        $table->foreign('order_number')->references('id')->on('orders');
        $table->foreign('product_id')->references('id')->on('products');
        $table->dateTime('chargecardtime');
        $table->dateTime('packingtime');
        $table->date('shiporderdate');
        $table->timestamps();
    });

订单表:

    Schema::create('orders', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('customer_id')->unsigned();
        $table->integer('product_id')->unsigned();
        $table->foreign('customer_id')->references('id')->on('users');
        $table->foreign('product_id')->references('id')->on('products');
        $table->string('name');
        $table->string('to_street');
        $table->string('to_city');
        $table->date('ship_date');  
        $table->string('phone');
        $table->timestamps();
    });

异常跟踪:

1 PDOException::("SQLSTATE[HY000]: 一般错误:1005 无法创建表 ec。#sql-3664_86 (errno: 150 "外键约束的形成不正确")")

我猜订单表有问题，因为发生错误后我看不到数据库中的该表。其他表已创建。

Answer 1

由于您引用的是id，因此您需要将外键列设为无符号。因为 id 默认情况下是无符号的(非负)。

因此，对所有外键执行以下操作:

$table->integer('product_id')->unsigned();