Laravel SQLSTATE [42000]：语法错误或访问冲突：1064

Hi i want to create a foreign key but nothing work and i don't understand whyenter image description here

嗨,我想创建一个外键但没有任何工作,我不明白为什么在这里的图像描述

在此处输入图像描述

3 个解决方案

#1

Please provide more info about table type, for now based on info that you type I can suggest you check are you using InnoDB tables? does FOREIGN KEY in table one corresponding to PK in table 2? are they have same types and length?

请提供有关表类型的更多信息,现在根据您键入的信息,我建议您检查是否使用InnoDB表?在表1中对应于表2中的PK的FOREIGN KEY?他们有相同的类型和长度?

#2

The correct syntax for a foreign key is references, per the documentation.

根据文档,外键的正确语法是引用。

Also Laravel table names are typically pluralised, so check category is correct too.

Laravel表名称通常也是复数,因此检查类别也是正确的。

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

#3

articles table

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

class CreateArticlesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('articles', function (Blueprint $table) {
            $table->increments('id');
            $table->string('title' , 255);
            $table->text('content');
            $table->integer('user_id')->unsigned();
            $table->foreign('user_id')->references('id')->on('users');
            $table->timestamps();
        });
    }

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

category table

<?php

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

class CreateCategoryTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('category', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->timestamps();
        });
    }

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

#1