详细Laravel5.5执行表迁移命令出现表为空的解决方案

今天在使用一个第三方包 laravel-admin 时，出现了这样的错误：SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table name '',折腾了好久，终于知道了解决方法，原来是配置文件的缓存没有清理。

一、问题

vagrant@homestead:~/Code/laravel-shop$ php artisan admin:install

错误提示：

In Connection.php line 664:

  SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table name '' (SQL: create table `` (`id` int uns
  igned not null auto_increment primary key, `username` varchar(190) not null, `password` varchar(60) not null, `name
  ` varchar(255) not null, `avatar` varchar(255) null, `remember_token` varchar(100) null, `created_at` timestamp nul
  l, `updated_at` timestamp null) default character set utf8mb4 collate utf8mb4_unicode_ci)

In Connection.php line 452:

  SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table name ''

二、解决方案

database/migrations/2016_01_04_173148_create_admin_table.php

<?phpuse Illuminate/Database/Migrations/Migration;use Illuminate/Database/Schema/Blueprint;class CreateAdminTable extends Migration{  /**   * Run the migrations.   *   * @return void   */  public function up()  {    $connection = config('admin.database.connection') ?: config('database.default');    // dd(app('config'));    Schema::connection($connection)->create(config('admin.database.users_table'), function (Blueprint $table) {      $table->increments('id');      $table->string('username', 190)->unique();      $table->string('password', 60);      $table->string('name');      $table->string('avatar')->nullable();      $table->string('remember_token', 100)->nullable();      $table->timestamps();    });    Schema::connection($connection)->create(config('admin.database.roles_table'), function (Blueprint $table) {      $table->increments('id');      $table->string('name', 50)->unique();      $table->string('slug', 50);      $table->timestamps();    });    Schema::connection($connection)->create(config('admin.database.permissions_table'), function (Blueprint $table) {      $table->increments('id');      $table->string('name', 50)->unique();      $table->string('slug', 50);      $table->string('http_method')->nullable();      $table->text('http_path')->nullable();      $table->timestamps();    });    Schema::connection($connection)->create(config('admin.database.menu_table'), function (Blueprint $table) {      $table->increments('id');      $table->integer('parent_id')->default(0);      $table->integer('order')->default(0);      $table->string('title', 50);      $table->string('icon', 50);      $table->string('uri', 50)->nullable();      $table->timestamps();    });    Schema::connection($connection)->create(config('admin.database.role_users_table'), function (Blueprint $table) {      $table->integer('role_id');      $table->integer('user_id');      $table->index(['role_id', 'user_id']);      $table->timestamps();    });    Schema::connection($connection)->create(config('admin.database.role_permissions_table'), function (Blueprint $table) {      $table->integer('role_id');      $table->integer('permission_id');      $table->index(['role_id', 'permission_id']);      $table->timestamps();    });    Schema::connection($connection)->create(config('admin.database.user_permissions_table'), function (Blueprint $table) {      $table->integer('user_id');      $table->integer('permission_id');      $table->index(['user_id', 'permission_id']);      $table->timestamps();    });    Schema::connection($connection)->create(config('admin.database.role_menu_table'), function (Blueprint $table) {      $table->integer('role_id');      $table->integer('menu_id');      $table->index(['role_id', 'menu_id']);      $table->timestamps();    });    Schema::connection($connection)->create(config('admin.database.operation_log_table'), function (Blueprint $table) {      $table->increments('id');      $table->integer('user_id');      $table->string('path');      $table->string('method', 10);      $table->string('ip', 15);      $table->text('input');      $table->index('user_id');      $table->timestamps();    });  }  /**   * Reverse the migrations.   *   * @return void   */  public function down()  {    $connection = config('admin.database.connection') ?: config('database.default');    Schema::connection($connection)->dropIfExists(config('admin.database.users_table'));    Schema::connection($connection)->dropIfExists(config('admin.database.roles_table'));    Schema::connection($connection)->dropIfExists(config('admin.database.permissions_table'));    Schema::connection($connection)->dropIfExists(config('admin.database.menu_table'));    Schema::connection($connection)->dropIfExists(config('admin.database.user_permissions_table'));    Schema::connection($connection)->dropIfExists(config('admin.database.role_users_table'));    Schema::connection($connection)->dropIfExists(config('admin.database.role_permissions_table'));    Schema::connection($connection)->dropIfExists(config('admin.database.role_menu_table'));    Schema::connection($connection)->dropIfExists(config('admin.database.operation_log_table'));  }}