判断所给路径文件/文件夹是否存在.

判断给定路径的文件是否存在，不存在则创建.

生成数据库名称，用.

根据给定的文件路径名，创建文件.

Gzip and tar from source directory or file to destination file you need check file exist before you call this function.

Ungzip and untar from source file to destination directory you need check file exist before you call this function.