//默认数据库为mysql
'default' => env('DB_CONNECTION', 'mysql'), 
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', '127.0.0.1'),
'port' => env('DB_PORT', '3306'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', ''),
'unix_socket' => env('DB_SOCKET', ''),
'charset' => 'utf8mb4',
'collation' => 'utf8mb4_unicode_ci',
'prefix' => '',
'strict' => true,
'engine' => null,
],

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=homestead
DB_USERNAME=homestead
DB_PASSWORD=secret

DB_CONNECTION=mysql
DB_HOST=localhost
DB_PORT=3306
DB_DATABASE=laravel
DB_USERNAME=root
DB_PASSWORD=123456

namespace App\Http\Controllers;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
  //添加
  public function addstudent(){
    $student = DB::insert('insert into student(name,age,gender) values("color: #ff0000">(1/1) UnexpectedValueException

The Response content must be a string or object implementing __toString(), "boolean" given.

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