迁移中的外键错误 laravel 5.1

Question

我已经迁移了这段代码

 public function up()
{
    Schema::create('TechnicianGroup', function(Blueprint $table){
        $table->increments('id')->unsigned();
        $table->string('name', 255);
        $table->string('description', 64);
        $table->string('token', 255);
        $table->timestamps();
    });
    Schema::create('Site', function(Blueprint $table){
        $table->increments('id');
        $table->string('name', 255);
        $table->string('token', 255);
        $table->timestamps();
    });
    Schema::create('technician', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name', 50);
        $table->string('username', 50);
        $table->string('password', 255);
        $table->string('email', 255);
        $table->string('mobile', 11);
        $table->string('avatar_url', 256);
        $table->string('job_title', 100);
        $table->integer('site_id');
        $table->foreign('site_id')->references('id')->on('site')->onDelete('cascade');
        $table->integer('group_id');
        $table->boolean('is_active');
        $table->string('token', 255);
        $table->timestamps();
    });

}

当我执行迁移时

php artisan migrate

结果是

[Illuminate\Database\QueryException] SQLSTATE[HY000]: General error: 1005 Can't create table 'upport.#sql-a3c_140' (errno: 150) (SQL: alter table technician add constraint technician_site_id_foreign foreign key (site_id) referen ces site (id)) [PDOException] SQLSTATE[HY000]: General error: 1005 Can't create table 'upport.#sql-a3c_140' (errno: 150)

Answer 1

您忘记使用 unsigned()。如果你不使用 unsinged()，该列将是 int(11)，但你需要 int(10)。

site.id和technician.site_id必须是同一类型：int(10)

试试这个：

$table->foreign('site_id')->unsigned()->references('id')->on('site')->onDelete('cascade');

迁移中的外键错误 laravel 5.1

Foreign Key error in migration laravel 5.1

php

foreign-keys

laravel-5.1

mysql-error-1064