python - Cannot remove SQLite row using 'where' and variable -

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got problem, appreciate on it.

i want remove row, transferred func variable. that's code:

con = sql.connect('db.sqlite') cur = con.cursor() query = 'delete media_tmp media_id="%s"' % media_id.strip() print(query) cur.execute(query) if con:     con.close()

print(query) gives me following:

delete media_tmp media_id="737589711821419460_184456611"

and when execute directly in sqlite, works , removes deserved row. executed cur.execute(query) doesn't work @ all.

the func finishes good, got no errors.

you forgetting commit change:

con.commit()

the sqlite3 command line tool auto-commits changes, sqlite3 library not.

you should use sql parameters instead of string interpolation:

query = 'delete media_tmp media_id=?' cur.execute(query, (media_id.strip(),))

quoting sqlite3 documentation:

usually sql operations need use values python variables. shouldn’t assemble query using python’s string operations because doing insecure; makes program vulnerable sql injection attack (see http://xkcd.com/327/ humorous example of can go wrong).

instead, use db-api’s parameter substitution. put ? placeholder wherever want use value, , provide tuple of values second argument cursor’s execute() method. (other database modules may use different placeholder, such %s or :1.)


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