BaseConnection - Added automatic handling of query class for 3rd party drivers

system/Database/BaseConnection.php

@@ -289,6 +289,13 @@ abstract class BaseConnection implements ConnectionInterface
 	 */
 	protected $aliasedTables = [];
 
+	/**
+	 * Query Class
+	 *
+	 * @var string
+	 */
+	protected $queryClass = 'CodeIgniter\\Database\\Query';
+
 	//--------------------------------------------------------------------
 
 	/**
@@ -302,6 +309,13 @@ public function __construct(array $params)
 		{
 			$this->$key = $value;
 		}
+
+		$queryClass = str_replace('Connection', 'Query', static::class);
+
+		if (class_exists($queryClass))
+		{
+			$this->queryClass = $queryClass;
+		}
 	}
 
 	//--------------------------------------------------------------------
@@ -594,9 +608,13 @@ abstract protected function execute(string $sql);
 	 * @param string  $queryClass
 	 *
 	 * @return BaseResult|Query|false
+	 *
+	 * @todo BC set $queryClass default as null in 4.1
 	 */
-	public function query(string $sql, $binds = null, bool $setEscapeFlags = true, string $queryClass = 'CodeIgniter\\Database\\Query')
+	public function query(string $sql, $binds = null, bool $setEscapeFlags = true, string $queryClass = '')
 	{
+		$queryClass = $queryClass ?: $this->queryClass;
+
 		if (empty($this->connID))
 		{
 			$this->initialize();

system/Test/Mock/MockConnection.php

@@ -49,8 +49,10 @@ public function shouldReturn(string $method, $return)
 	 * @param string  $queryClass
 	 *
 	 * @return BaseResult|Query|false
+	 *
+	 * @todo BC set $queryClass default as null in 4.1
 	 */
-	public function query(string $sql, $binds = null, bool $setEscapeFlags = true, string $queryClass = 'CodeIgniter\\Database\\Query')
+	public function query(string $sql, $binds = null, bool $setEscapeFlags = true, string $queryClass = '')
 	{
 		$queryClass = str_replace('Connection', 'Query', get_class($this));