Syntax error in retrieving data from SQLite

Question

When running the following code I get a sqlite3.OperationalError: near XX error...

The code is in python and is the following:

def get(item_id='', table='groups', field='id', encrypt=True):
    conn = sqlite3.connect('data.db')
    c = conn.cursor()
    if item_id == '':
        sqlstr = 'SELECT * FROM {}'.format(table)
        c.execute(sqlstr)
    else:
        if encrypt:
            item_id = encryption.encrypt(item_id)
        sqlstr = "SELECT * FROM {} WHERE {}={}".format(table, field, item_id)
        c.execute(sqlstr)

considering as variables the following:

table = 'groups'
field = 'id'
encrypt = True and considering that the value returned by encryption.encrypt(item_id) is 'gAAAAABe7UPHni1WJ1pSaljNj30k_SX-xGEfyCNMwO-3Pgjm1I57ROxSq5liNnm8yk5pjv0ZY7SyTUMIYqZrOyLeLQZNZ63iMw==' , I get the following error:

Traceback (most recent call last):
  File "d:\dhfwi\Projects\FridaysForFuture\fff-transparency-wg\.env\lib\site-packages\telegram\utils\promise.py", line 57, in run
    self._result = self.pooled_function(*self.args, **self.kwargs)
  File "d:\dhfwi\Projects\FridaysForFuture\fff-transparency-wg\fff_automation\bots\telebot\editgroup.py", line 10, in edit_group
    group = database.get(chat_id)[0]
  File "d:\dhfwi\Projects\FridaysForFuture\fff-transparency-wg\fff_automation\modules\database.py", line 149, in get
    c.execute(sqlstr)
sqlite3.OperationalError: near "'gAAAAABe7UPHni1WJ1pSaljNj30k_SX-xGEfyCNMwO-3Pgjm1I57ROxSq5liNnm8yk5pjv0ZY7SyTUMIYqZrOyLeLQZNZ63iMw=='": syntax error

I tried adding '' around the {} of the item_id field in the sqlstr,

sqlstr = "SELECT * FROM {} WHERE {}='{}'".format(table, field, item_id)

but by doing that, I get the following error:

Traceback (most recent call last):
  File "d:\dhfwi\Projects\FridaysForFuture\fff-transparency-wg\.env\lib\site-packages\telegram\utils\promise.py", line 57, in run
    self._result = self.pooled_function(*self.args, **self.kwargs)
  File "d:\dhfwi\Projects\FridaysForFuture\fff-transparency-wg\fff_automation\bots\telebot\editgroup.py", line 10, in edit_group
    group = database.get(chat_id)[0]
  File "d:\dhfwi\Projects\FridaysForFuture\fff-transparency-wg\fff_automation\modules\database.py", line 149, in get
    c.execute(sqlstr)
sqlite3.OperationalError: near "gAAAAABe7Ue7Yg6OP2ipWHGAXfZCiCVgbpdPso3noPYCjW4ds9rY8Yg9HN0Dhm10DDh7wYQ3kf2OuSabHlxcrg5xzwEdO4V31Q": syntax error

Does that item contain single quotes within its value?

Parfait
– Parfait

2020-06-20 00:09:08 +00:00
Commented Jun 20, 2020 at 0:09 — Parfait
– Parfait, Commented Jun 20, 2020 at 0:09

Parfait · Accepted Answer · 2020-06-20 00:14:25Z

1

Consider passing item_id as a parameter with qmark placeholder since quote confusion may be the issue:

sqlstr = "SELECT * FROM {} WHERE {}=?".format(table, field)
# sqlstr = f"SELECT * FROM {table} WHERE {field}=?"    # F-String (Python 3.6+)

c.execute(sqlstr, (item,))

answered Jun 20, 2020 at 0:14

Parfait

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