無法連接到數據庫 - 沒有選擇數據庫錯誤

Question

我一直在努力使這項工作在過去一個多小時左右。

我在嘗試在laravel中執行查詢時出現錯誤。

精確誤差如下：

exception 'PDOException' with message 'SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected' in D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Connection.php:272 
Stack trace: 
#0 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Connection.php(272): PDO->prepare('select count(*)...') 
#1 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Connection.php(521): Illuminate\Database\Connection->Illuminate\Database\{closure}(Object(Illuminate\Database\MySqlConnection), 'select count(*)...', Array) 
#2 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Connection.php(277): Illuminate\Database\Connection->run('select count(*)...', Array, Object(Closure)) 
#3 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Query\Builder.php(1028): Illuminate\Database\Connection->select('select count(*)...', Array) 
#4 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Query\Builder.php(1018): Illuminate\Database\Query\Builder->runSelect() 
#5 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Query\Builder.php(1005): Illuminate\Database\Query\Builder->getFresh(Array) 
#6 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Query\Builder.php(1369): Illuminate\Database\Query\Builder->get(Array) 
#7 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Query\Builder.php(1311): Illuminate\Database\Query\Builder->aggregate('count', Array) 
#8 [internal function]: Illuminate\Database\Query\Builder->count() 
#9 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Builder.php(786): call_user_func_array(Array, Array) 
#10 D:\www\testapp\app\routes.php(67): Illuminate\Database\Eloquent\Builder->__call('count', Array) 
#11 D:\www\testapp\app\routes.php(67): Illuminate\Database\Eloquent\Builder->count() 
#12 [internal function]: {closure}() 
#13 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Routing\Route.php(80): call_user_func_array(Object(Closure), Array) 
#14 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Routing\Route.php(47): Illuminate\Routing\Route->callCallable() 
#15 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Routing\Router.php(1016): Illuminate\Routing\Route->run(Object(Illuminate\Http\Request)) 
#16 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Foundation\Application.php(574): Illuminate\Routing\Router->dispatch(Object(Illuminate\Http\Request)) 
#17 D:\www\testapp\vendor\laravel\framework\src\Illuminate\Foundation\Application.php(550): Illuminate\Foundation\Application->dispatch(Object(Illuminate\Http\Request)) 
#18 D:\www\testapp\public\index.php(50): Illuminate\Foundation\Application->run() 
#19 {main} 

我的config/database.php中是如下：

'connections' => array(

    'mysql' => array(
     'driver' => 'mysql', 
     'host'  => 'localhost', 
     'database' => 'testdatabase', 
     'username' => 'MYUSER', 
     'password' => 'MYPASSWORD', 
     'charset' => 'utf8', 
     'collation' => 'utf8_unicode_ci', 
     'prefix' => '', 
    ), 

), 

觸發此錯誤代碼是：

$users = DB::table('users')->get(); 
print_r($users . "users"); 

能有人請幫助，我檢查給定的MySQL用戶的權限，我也用root帳戶嘗試過，但迄今爲止無濟於事。

Answer 1

這是一個環境問題。

將您的database.php配置文件放入config/{environment}/database.php，然後檢查是否在bootstrap/start.php文件中正確定義了env，它應該可以工作。

要檢查什麼是當前的ENV，運行：

echo App::environment();