GreenDao查询与不同

Question

我是GreenDao的新手，想要通过stuffId加载一个列表。我需要使用Distinct查询来防止重复！ 如何在查询中使用distinct？下面的代码不起作用!!

from hashlib import md5

def md5File(filename):
    hasher = md5()
    blockSize = 16 * 1024 * 1024

    with open(filename, 'rb') as f:
        while True:
            fileBuffer = f.read(blockSize)
            if not fileBuffer:
                break

            hasher.update(fileBuffer)

    return hasher.hexdigest()

def isImageLatest(file1,file2):
    print('Checking md5sum of {} {}'.format(file1, file2))

    if os.path.isfile(file1) and os.path.isfile(file2):
        md5File1 = md5File(file1)
        md5File2 = md5File(file2)
        print('md5sum of {} is {}'.format(file1, md5File1))
        print('md5sum of {} is {}'.format(file2, md5File2))
    else:
        print('Either {} or {} File not found'.format(file1,file2))
        return False

    return md5File1 == md5File