Menu
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' constrain = 'Mann' with con: cur = con.cursor() cur.execute("SELECT ? FROM Data where ?=?", (column, goal, constrain)) con.commit() rows = cur.fetchall() for element in rows: values.append(element) This returns an empty list. If I hardcode the strings, it works and returns values.
545
SQLite Python: Querying Data First, establish a connection to the SQLite database by creating a Connection object. Next, create a Cursor object using the cursor method of the Connection object. Then, execute a SELECT statement. After that, call the fetchall() method of the cursor object to fetch the data.
You can fetch data from MYSQL using the fetch() method provided by the sqlite python module. The sqlite3. Cursor class provides three methods namely fetchall(), fetchmany() and, fetchone() where, The fetchall() method retrieves all the rows in the result set of a query and returns them as list of tuples.
This library takes the SQLite module from Python 3 and packages it as a separately-installable module. This may be useful for creating SQLite modules capable of working with other versions of SQLite (via the amalgamation option). Additional features: User-defined window functions (requires SQLite >= 3.25)
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.)
93
Try this: c.execute("SELECT {idf} FROM Data WHERE {goal}".\ format(idf=column, goal=constrain))
27
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
