connection.php

См. документацию.

<?php
 
namespace Bitrix\Main\Data;

abstract class Connection
{
    protected $resource;
    protected $isConnected = false;
    protected $configuration;
 
    public function __construct(array $configuration)
    {
        $this->configuration = $configuration;
    }

    public function connect()
    {
        $this->isConnected = false;
 
        $this->connectInternal();
    }

    public function disconnect()
    {
        $this->disconnectInternal();
    }

    public function getResource()
    {
        $this->connectInternal();
        return $this->resource;
    }

    public function isConnected()
    {
        return $this->isConnected;
    }
 
    abstract protected function connectInternal();
    abstract protected function disconnectInternal();

    public function getConfiguration()
    {
        return $this->configuration;
    }

    public function getMaxAllowedPacket()
    {
        return PHP_INT_MAX;
    }
}