从mysql打印/解析csv blob文件

Question

查询数据库中的blob文件，是否可以从blob文件而不是数组中读取为文本

这是我的简单代码：

sql= "select blob_file as blob_file from Blob_Table limit 1"                                          
cursor.execute(sql)
result = cursor.fetchall()

for i in result :
    print i["file_backup"]

我的输出是这样的，一个 array.array 类型：

array('b', [67, 97, 114, 114, 105, 101, 114, 32, 73, 68, 44, 83, 116, 97, 103, 101, 32, 82, 111, 119, 44, 83, 116, 97, 103, 101, 32, 67, 111, 108, 117, 109, 110, 44, 68, 97, 116, 101, 44, 84, 105, 109, 101, 44, 65, 65, 66, 32, 50, 76, 32, 68, 101, 112, 116, 104, 44, 65, 65, 66, 32, 67, 97, 118, 105, 116, 121, 32, 82, 97, 44, 65, 65, 66, 32, 67, 97, 118, 105, 116, 121, 32, 68, 101, 112, 116, 104, 44, 65, 65, 66, 32, 65, 66, 83, 32, 81, 117, 97, 108, 105, 116, 121, 32, 111, 102, 32, 70, 105, 116, 44, 67, 111, 110, 102, 105, 103, 32, 110, 97, 109, 101, 40, 110, 97, 109, 101, 32, 111, 110, 108, 121, 41, 44, 65, 65, 66, 32, 65, 66, 83, 32, 80, 105, 120, 32, 67, 111, 117, 110, 116, 44, 65, 65, 66, 32, 50, 110, 100, 32, 76, 118, 108, 32, 80, 105, 120, 32, 67, 111, 117, 110, 116, 44, 65, 65, 66, 32, 67, 97, 118, 105, 116, 121, 32, 80, 105, 120, 32, 67, 111, 117, 110, 116, 44, 65, 65, 66, 32, 67, 97, 118, 105, 116, 121, 32, 82, 113, 44, 65, 65, 66, 32, 65, 66, 83, 32, 81, 117, 97, 100, 32, 67, 114, 111, 119, 110, 44, 84, 101, 109, 112, 108, 97, 116, 101, 32, 70, 105, 116, 32, 81, 117, 97, 108, 105, 116, 121, 44, 84, 101, 109, 112, 108, 97, 116, 101, 32, 82, 111, 116, 97, 116, 105, 111, 110, 44, 84, 101, 109, 112, 108, 97, 116, 101, 32, 88, 32, 84, 114, 97, 110, 108, 97, 116, 105, 111, 110, 44, 84, 101, 4, 54, 13, 10])

可以转换这些，因为我的 blob 文件是来自 csv 的纯文本..

Answer 1

首先，您拥有的类型似乎是一个字节数组。出于测试的目的，我运行以下命令来获取与您相同的字节数组：

raw_results = bytearray([67, 97, 114, 114, 105, 101, 114, 32, 73, 68, 44, 83, 116, 97, 103, 101, 32, 82, 111, 119, 44, 83, 116, 97, 103, 101, 32, 67, 111, 108, 117, 109, 110, 44, 68, 97, 116, 101, 44, 84, 105, 109, 101, 44, 65, 65, 66, 32, 50, 76, 32, 68, 101, 112, 116, 104, 44, 65, 65, 66, 32, 67, 97, 118, 105, 116, 121, 32, 82, 97, 44, 65, 65, 66, 32, 67, 97, 118, 105, 116, 121, 32, 68, 101, 112, 116, 104, 44, 65, 65, 66, 32, 65, 66, 83, 32, 81, 117, 97, 108, 105, 116, 121, 32, 111, 102, 32, 70, 105, 116, 44, 67, 111, 110, 102, 105, 103, 32, 110, 97, 109, 101, 40, 110, 97, 109, 101, 32, 111, 110, 108, 121, 41, 44, 65, 65, 66, 32, 65, 66, 83, 32, 80, 105, 120, 32, 67, 111, 117, 110, 116, 44, 65, 65, 66, 32, 50, 110, 100, 32, 76, 118, 108, 32, 80, 105, 120, 32, 67, 111, 117, 110, 116, 44, 65, 65, 66, 32, 67, 97, 118, 105, 116, 121, 32, 80, 105, 120, 32, 67, 111, 117, 110, 116, 44, 65, 65, 66, 32, 67, 97, 118, 105, 116, 121, 32, 82, 113, 44, 65, 65, 66, 32, 65, 66, 83, 32, 81, 117, 97, 100, 32, 67, 114, 111, 119, 110, 44, 84, 101, 109, 112, 108, 97, 116, 101, 32, 70, 105, 116, 32, 81, 117, 97, 108, 105, 116, 121, 44, 84, 101, 109, 112, 108, 97, 116, 101, 32, 82, 111, 116, 97, 116, 105, 111, 110, 44, 84, 101, 109, 112, 108, 97, 116, 101, 32, 88, 32, 84, 114, 97, 110, 108, 97, 116, 105, 111, 110, 44, 84, 101, 4, 54, 13, 10])

现在我想把它变成一个更容易使用的格式，那就是一个字符串： results = raw_results.decode('utf-8')

应该这样做。

以后您可能希望使用csv 模块来读取您的csv 字符串，这样您就不必处理引号逗号等问题。但是，csv 阅读器通常从文件中读取，但它适用于遍历行的任何内容。所以你可能想做这样的事情来实际处理数据。示例见Python csv string to array。