从 sqlalchemy 转储 csv [英] dump csv from sqlalchemy

问题描述

出于某种原因，我想以 csv 文件的形式从数据库 (sqlite3) 转储一个表.我正在使用带有 elixir(基于 sqlalchemy)的 python 脚本来修改数据库.我想知道是否有任何方法可以将我使用的表格转储到 csv.

For some reason, I want to dump a table from a database (sqlite3) in the form of a csv file. I'm using a python script with elixir (based on sqlalchemy) to modify the database. I was wondering if there is any way to dump the table I use to csv.

我见过 sqlalchemy serializer 但它似乎没有成为我想要的.我做错了吗?我应该在关闭 sqlalchemy 会话后调用 sqlite3 python 模块来转储到文件吗?还是我应该使用自制的东西?

I've seen sqlalchemy serializer but it doesn't seem to be what I want. Am I doing it wrong? Should I call the sqlite3 python module after closing my sqlalchemy session to dump to a file instead? Or should I use something homemade?

推荐答案

有很多方法可以实现这一点，包括一个简单的os.system()调用sqlite3> 实用程序，如果你安装了它，但这里大致是我用 Python 做的:

There are numerous ways to achieve this, including a simple os.system() call to the sqlite3 utility if you have that installed, but here's roughly what I'd do from Python:

import sqlite3
import csv

con = sqlite3.connect('mydatabase.db')
outfile = open('mydump.csv', 'wb')
outcsv = csv.writer(outfile)

cursor = con.execute('select * from mytable')

# dump column titles (optional)
outcsv.writerow(x[0] for x in cursor.description)
# dump rows
outcsv.writerows(cursor.fetchall())

outfile.close()

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