无法使用python将来自mssql的二进制数据插入sqlite3

Question

I am trying to query an Microsoft SQL 2005 database, process the data and write the keys to the data I updated to an sqllite3 database store locally on my machine.

The tools I'm using are python 2.7, pyodbc and sqllite3. I am on windows 7 and the driver I've tried connecting to my mssql db using the sql server and sql native client driver with pyodbc and both yield the same results.

The field I am having issues with is a uuid field that is binary(16) in mssql. When I query the data using pyodbc it is coming back to me in a bytearray().

This is the output I get when I run the following.

id = mycursor.fetchone()
print id

àO÷ eÅO‹1ÝWt'E

repr(id)

bytearray(b'\\xe0O\\xf7\\x1d\\x9de\\xc5O\\x8b1\\x0e\\xddWt\\x91E')

When I go to insert that Id into an sqllite3 database I get the following.

s = sqlite3.connect('tmp.db')
cursor = s.cursor()
s.execute("create table recs(uuid blob)")
s.commit()
s.execute("insert into recs (uuid) values(?)", id)

1 s.execute("insert into recs (uuid) values(?)", id)

ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and there are 16 supplied.

Answer 1

The Python value needs to be a buffer object:

>>> s.execute("insert into recs (uuid) values(?)", (buffer(id), ))
<sqlite3.Cursor object at 0x011CD2E0>
>>> r = s.execute("select * from recs").fetchone()
>>> r
(<read-write buffer ptr 0x011F9280, size 16 at 0x011F9260>,)
>>> r[0]
<read-write buffer ptr 0x011F9280, size 16 at 0x011F9260>
>>> str(r[0])
'\xe0O\xf7\x1d\x9de\xc5O\x8b1\x0e\xddWt\x91E'
>>> str(r[0]) == id
True