使用Python连接字典值时，如何仅用引号将字符串引起来？

Question

i'm practicing on Python and trying to create a class that helps performing database operations, but when inserting to a database here's the code :

def Insert(self, **kwargs):
    self.__query.execute("INSERT INTO {} ({}) VALUES ({})".format(self.table, ", ".join(kwargs.keys()), ", ".join(str(v) for v in kwargs.values())))
    self.__db.commit()

When i ran this code for testing:

MyTable.Insert(id=3, name="jack", age=23)

I got this error :

sqlite3.OperationalError: no such column: jack

When i replaced the execute command with print i got this :

INSERT INTO testTbl111 (id, name, age) VALUES (3, jack, 23)

I guess jack must be surrounded by quotations.

My question: is how to surround jack with quotation while doing ", ".join(str(v) for v in kwargs.values()) ?

Answer 1

You don't want to try to escape value parameters yourself, instead you want to build the insert query and put placeholders ( ? works for sqlite3) for values - something like:

query = 'INSERT INTO {} ({}) VALUES({})'.format(self.table, ', '.join(kwargs), ','.join(['?'] * len(kwargs)))

Then, use the second method of execute (either on the db object or cursor object) to pass in the values to be substituted - these will automatically be correctly escaped for the database.

self.__db.execute(query, list(kwargs.values()))