Python sqlite3 string variable in execute

Question

I try to execute this sqlite3 query in Python. I reduced the code to the minimum, sqlite.connect, etc works.

column = \'Pron_1_Pers_Sg\'
goal = \'gender\' 
c         


        

Answer 1

Try this: c.execute("SELECT {idf} FROM Data WHERE {goal}".\ format(idf=column, goal=constrain))

Answer 2

Parameter markers can be used only for expressions, i.e., values. You cannot use them for identifiers like table and column names.

Use this:

cur.execute("SELECT "+column+" FROM Data where "+goal+"=?", (constrain,))

or this:

cur.execute("SELECT %s FROM Data where %s=?" % (column, goal), (constrain,))

(And don't commit before you have actually finished accessing the data.)

Answer 3

I was having quite a similar problem today. I am not sure, if this might solve your problem:

cur.execute("SELECT ? FROM Data where ?=?", (column, goal, constrain,))

Important is the last ,

Give it a try, this was the problem with my code - so maybe it helps you too. Sorry, for not being able to really explain why, as I am just learning myself and am into python/sqlite for some weeks.