[Tutor] TypeError when io.open is used

[Marc Tompkins]

On Sun, Jun 27, 2010 at 3:20 PM, <petkovas at dir.bg> wrote:

> I have tried the following, too:
>
> from pg8000 import DBAPI
> import os
> import os.path
> import sys
>
> # !!! that is test data. It must be changed
> conn=DBAPI.connect(host="localhost", database="postgres", user="postgres",
> password="test")
>
> #conn.cursor will return a cursor oject, you can use this cursor to perform
> queries
> cursor = conn.cursor()
>
> file = open(
> "C:\\Blender_Library\\BlenderLib\\objectLib\\Faqns\\Osaka2\\faqns_osaka_2.jpg",
> "rb" )
> data1 = DBAPI.Binary(file.read())
> data2 = 'faqns_osaka_2'
>
> # execute our Query
> cursor.execute("UPDATE testtable SET jpeg = %s WHERE testtable_n = %s",
> data1, data2)
> sys.stdout.flush()
>
> # Save (commit) the changes
> conn.commit()
>
> # We can also close the cursor if we are done with it
> cursor.close()
>
> The problem this time was:
> Traceback <most recent call last>:
>   File "insertdb_pg8000.py", line 19, in <module>
>      cursor.execute("UPDATE testtable SET jpeg = %s WHERE testtable_n =
> %s", data1, data2)
>   File "build\bdist.win32\egg\pg8000\dbapi.py", line 243, in _fn
> TypeError: execute() takes at most 3 arguments (4 given)
>
>
I don't have any insight into your other piece of code, but here I think you
just need another set of parentheses - so that the string interpolation is
done first, and the result of it becomes the argument to cursor.execute().
I can't really test it at the moment, but try changing it to:
cursor.execute( ("UPDATE testtable SET jpeg = %s WHERE testtable_n = %s",
data1, data2) )

Either that, or break it into two lines:

myQuery = "UPDATE testtable SET jpeg = %s WHERE testtable_n = %s", data1,
data2
cursor.execute(myQuery)

-- 
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