public function createSQL()
	{
		try {

			$lines = array();

			$indices = array();

			$columns = $this->columns;

			$template = "CREATE TABLE %s (\n%s,\n%s\n) ENGINE=%s DEFAULT CHARSET=%s;";

			foreach ($this->columns as $column_name => $column)
			{

				//$column_name = $column["name"];//set the column name

				$data_type = $column["type"];//set the column data type

				$length = $column["length"];//set the lenght of the data type

				if ($column["primary"])	$indices[] = "PRIMARY KEY ({$column_name})"; //add primary key field

				if ($column["index"]) $indices[] = "KEY {$column_name} ({$column_name})"; //add index field

				switch ($data_type)
				{
					case "autonumber":

						$lines[] = "{$column_name} INT(11) NOT NULL AUTO_INCREMENT";

						break;

					case "text":

						if ($length !== null && $length <= 255)	$lines[] = "{$column_name} VARCHAR({$length}) DEFAULT NULL";

						else $lines[] = "{$column_name} text";

						break;

					case "integer":

						$lines[] = "{$column_name} INT(11) DEFAULT NULL";

						break;

					case "decimal":

						$lines[] = "{$column_name} FLOAT DEFAULT NULL";

						break;

					case "boolean":

						$lines[] = "{$column_name} TINYINT(4) DEFAULT NULL";

						break;

					case "datetime":

						$lines[] = "{$column_name} DATETIME DEFAULT NULL";

						break;

				}

			}

			$this->query_string = sprintf($template, $this->table, join(",\n", $lines), join(",\n", $indices), 'InnoDB', 'utf8');//$this->connection->character_set_name()
			
			return $this;

		} catch (MySQLException $e) {

			$e->errorShow();

		}
		
	}