Joomla Platform MySQLI DB Driver - overlays error

mysqli.php

	/**
	 * Execute the SQL statement.
	 *
	 * @return  mixed  A database cursor resource on success, boolean false on failure.
	 *
	 * @since   12.1
	 * @throws  RuntimeException
	 */
	public function execute()
	{
		$this->connect();

		if (!is_object($this->connection))
		{
			JLog::add(JText::sprintf('JLIB_DATABASE_QUERY_FAILED', $this->errorNum, $this->errorMsg), JLog::ERROR, 'database');
			throw new RuntimeException($this->errorMsg, $this->errorNum);
		}

		// Take a local copy so that we don't modify the original query and cause issues later
		$sql = $this->replacePrefix((string) $this->sql);
		if ($this->limit > 0 || $this->offset > 0)
		{
			$sql .= ' LIMIT ' . $this->offset . ', ' . $this->limit;
		}

		// Increment the query counter.
		$this->count++;

		// If debugging is enabled then let's log the query.
		if ($this->debug)
		{
			// Add the query to the object queue.
			$this->log[] = $sql;

			JLog::add($sql, JLog::DEBUG, 'databasequery');
		}

		// Reset the error values.
		$this->errorNum = 0;
		$this->errorMsg = '';

		// Execute the query. Error suppression is used here to prevent warnings/notices that the connection has been lost.
		$this->cursor = @mysqli_query($this->connection, $sql);

if ((int)mysqli_errno($this->connection) > 0) {
    echo '<br />After $this->cursor - display the untrapped error before it is overwritten by the next DB operation: ';
    echo '<br /> Code: ' . (int)mysqli_errno($this->connection). ': ';
    echo '<br /> Error: ' . (string)mysqli_error($this->connection). ': <br /><br />';
}

		// If an error occurred handle it.
		if (!$this->cursor)
		{
            echo '<br />There is no cursor and errors are still available since no more DB operations have taken place. ';
            echo '<br /> Code: ' . (int)mysqli_errno($this->connection). ': ';
            echo '<br /> Error: ' . (string)mysqli_error($this->connection). ': <br /><br />';

			// Check if the server was disconnected.
			if (!$this->connected())
			{
				try
				{
					// Attempt to reconnect.
					$this->connection = null;
					$this->connect();
				}
				// If connect fails, ignore that exception and throw the normal exception.
				catch (RuntimeException $e)
				{
					$this->errorNum = (int) mysqli_errno($this->connection);
					$this->errorMsg = (string) mysqli_error($this->connection) . ' SQL=' . $sql;

					JLog::add(JText::sprintf('JLIB_DATABASE_QUERY_FAILED', $this->errorNum, $this->errorMsg), JLog::ERROR, 'databasequery');
					throw new RuntimeException($this->errorMsg, $this->errorNum);
				}

				// Since we were able to reconnect, run the query again.
				return $this->execute();
			}
			// The server was not disconnected.
			else
			{
				$this->errorNum = (int) mysqli_errno($this->connection);
				$this->errorMsg = (string) mysqli_error($this->connection) . ' SQL=' . $sql;

                echo '<br />The connection is fine. The error code is zero now gone because the last DB operation -- $this->connection() -- was successful and overlaid the error codes. ';
                echo '<br /> Code: ' . $this->errorNum . ': ';
                echo '<br /> Error: ' . $this->errorMsg . ': <br /><br />';
                die;

				JLog::add(JText::sprintf('JLIB_DATABASE_QUERY_FAILED', $this->errorNum, $this->errorMsg), JLog::ERROR, 'databasequery');
				throw new RuntimeException($this->errorMsg, $this->errorNum);
			}
		}

		return $this->cursor;
	}