bugfix: get_session_db_type is not exported, use get_env instead
bugfix: get_session_db_type is not exported, use get_env instead

zhangchaoeasemob/erl_tool,wcy123/erl_tool,wcy123/erl_tool,wcy123/erl_tool,zhuxiangkui/erl_tool,zhangchaoeasemob/erl_tool,zhangchaoeasemob/erl_tool,zhuxiangkui/erl_tool,zhangchaoeasemob/erl_tool,zhuxiangkui/erl_tool,wcy123/erl_tool,zhuxiangkui/erl_tool,zhuxiangkui/erl_tool,zhangchaoeasemob/erl_tool,wcy123/erl_tool