Yii2 Create Database Connection

Question

I want to create a database connection programmatically without using the config file. I have a form wherein the user enters the database details like the hostname,

Answer 1

You can define a new connection this way:

   $db = new yii\db\Connection([
   'dsn' => 'mysql:host=localhost;dbname=example',
   'username' => 'root',
   'password' => '',
   'charset' => 'utf8',
]); 

$db->open();

After the DB connection is established, one can execute SQL statements like the following eg:

 $command = $db->createCommand('SELECT * FROM post');
 $posts = $command->queryAll();

 // or 

 $command = $connection->createCommand('UPDATE post SET status=1');
 $command->execute();

you can look at this for doc and guide

http://www.yiiframework.com/doc-2.0/guide-db-dao.html

http://www.yiiframework.com/doc-2.0/yii-db-connection.html