Be able to change database connection in runtime with Laravel - php

Question

So I am making a web application which should be able to upload any SQL statement to any server listed in the database on a schedule. It should connect to the database, execute the statement and make a report based on the information received. Then it can disconnect.
Currently, I have a job in place and it grabs all the information required from the database eg. host, port, DBName etc. I just need to form a connection and then execute the statement.
I am using the Laravel framework.
Edit: I cant modify any database configs as the database information is stored in a table, not a config file.
Thanks

Answer 1

You can set it at runtime this way:
$connKey = 'CustomConnection';
$dbInfo = DatabaseInfo::find($databaseId);
Config::set('database.connections.' . $connKey, array(
'driver' => 'mysql',
'host' => $dbInfo->hostName,
'database' => $dbInfo->database,
'username' => $dbInfo->username,
'password' => $dbInfo->password,
'charset' => 'utf8',
'collation' => 'utf8_general_ci',
'prefix' => '',
));
// Now you can set the new connection to the models
$myModel = new MyModel;
$myModel->setConnection($connKey);
// Or you can use it this way too:
$users = DB::connection($connKey)->select(...);
// Or, also:
$pdo = DB::connection($connKey)->getPdo();

Answer 2

I solved this in a very similar way to one posted :
$connectionName = Crypt::encryptString(str_random(80));
DB::purge("$connectionName");
Config::set("database.connections.$connectionName", [
"driver" => "$Driver",
"port" => "$Port",
"host" => "$Host",
"database" => "$DBName",
"username" => "$UserName",
"password" => "$Password"
]);
$query = DB::connection("$connectionName")->select($statement);
$query= json_decode( json_encode($query), true);
Excel::create("$filename-$mytime", function($excel) use ($query, $filename) {
$excel->sheet("$filename", function($sheet) use ($query){
$sheet->fromArray($query);
});
})->store('xls', storage_path('excel/exports'));
This creates a new connection with a random name (so when in a queue if multiple are executed they wont purge the same database), assigns the details to it, executes the select statement which is defined in the variable $statement. Then creates an excel spreadsheet from that.