使用 Python 将 blob 从 SQLite 写入文件

2022-01-09 00:00:00 python binary sql blob sqlite

毫无头绪的 Python 新手需要帮助.我创建了一个简单的脚本，将二进制文件插入到 SQLite 数据库的博客字段中，这让我感到困惑:

A clueless Python newbie needs help. I muddled through creating a simple script that inserts a binary file into a blog field in a SQLite database:

import sqlite3
conn = sqlite3.connect('database.db')
cursor = conn.cursor()
input_note = raw_input(_(u'Note: '))
    input_type = 'A'
    input_file = raw_input(_(u'Enter path to file: '))
        with open(input_file, 'rb') as f:
            ablob = f.read()
            f.close()
        cursor.execute("INSERT INTO notes (note, file) VALUES('"+input_note+"', ?)", [buffer(ablob)])
        conn.commit()
    conn.close()

现在我需要编写一个脚本来获取特定记录的 blob 字段的内容并将二进制 blob 写入文件.在我的例子中，我使用 SQLite 数据库来存储 .odt 文档，所以我想抓取它们并将它们保存为 .odt 文件.我该怎么做?谢谢！

Now I need to write a script that grabs the contents of the blob field of a specific record and writes the binary blob to a file. In my case, I use the SQLite database to store .odt documents, so I want to grab and save them as .odt files. How do I go about that? Thanks!

推荐答案

这是一个脚本，它确实读取文件，将其放入数据库，从数据库中读取，然后将其写入另一个文件:

Here's a script that does read a file, put it in the database, read it from database and then write it to another file:

import sqlite3
conn = sqlite3.connect('database.db')
cursor = conn.cursor()

with open("...", "rb") as input_file:
    ablob = input_file.read()
    cursor.execute("INSERT INTO notes (id, file) VALUES(0, ?)", [sqlite3.Binary(ablob)])
    conn.commit()

with open("Output.bin", "wb") as output_file:
    cursor.execute("SELECT file FROM notes WHERE id = 0")
    ablob = cursor.fetchone()
    output_file.write(ablob[0])

cursor.close()
conn.close()

我用 xml 和 pdf 对其进行了测试，它运行良好.用你的 odt 文件试试看它是否有效.

I tested it with an xml and a pdf and it worked perfectly. Try it with your odt file and see if it works.

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