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1215无法添加外键

laravel-migrations laravel mysql php

0

Prafulla Kumar Sahu umang naik · 技术社区 · 6 年前

第5.6.3节 PHP 7.2.10版

php artisan migrate:fresh

General error: 1215 Cannot add foreign key constraint (SQL: alter table `videos` add constraint `videos_video_identified_by_foreign` foreign key (`video_identified_by`) references `users` (`id`))

用户表混合文件-> 2014_10_12_000000_create_users_table 视频表迁移文件-> 2018_12_02_122553_create_videos_table

通常情况下,当父表不存在,并且我们在表中使用它的列作为外键时会发生这种情况,但是可以看到,用户表应该先创建,然后创建videos表,那么为什么会出现这个错误。

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

 Schema::create('videos', function (Blueprint $table) {
    $table->increments('video_id');
    $table->text('video_link');
    $table->text('video_description');
    $table->string('video_category');
    $table->string('video_language');
    $table->unsignedInteger('video_identified_by');
    $table->timestamps();            
});

Schema::table('videos', function($table) {
    $table->foreign('video_identified_by')->references('id')->on('users');
});

3 回复 | 直到 6 年前

1

0

haffis asma 6 年前

嗨,试试这对我来说很好

<?php
    $table->integer('video_identified_by')->unsigned();
    $table->foreign('video_identified_by')->references('id')->on('user')
          ->onUpdate('RESTRICT')->onDelete('CASCADE');      
?>

然后是php artisan移植:刷新

2

0

haffis asma 6 年前

啊,你在桌上视频里改变你的身份试试这个

     Schema::create('videos', function (Blueprint $table) {
        $table->increments('id');
        $table->text('video_link');
        $table->text('video_description');
        $table->string('video_category');
        $table->string('video_language');
        $table->integer('video_identified_by')->unsigned();
        $table->foreign('video_identified_by')->references('id')->on('users')
          ->onUpdate('RESTRICT')->onDelete('CASCADE');   
        $table->timestamps();            
    });

    }
 public function down()
    {
        Schema::dropIfExists('videos');
    }

3

0

Shikha 6 年前

Schema::create('videos', function (Blueprint $table) {
$table->increments('video_id');
$table->text('video_link');
$table->text('video_description');
$table->string('video_category');
$table->string('video_language');
$table->unsigned('video_identified_by');
$table->timestamps();            
});

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