[Python] Parameter substitution for a SQLite "IN" clause

Discussão em 'Python' iniciado por Stack, Junho 14, 2025.

  1. Stack

    Stack Membro Participativo

    I am trying to use parameter substitution with SQLite within Python for an IN clause. Here is a complete running example that demonstrates:

    import sqlite3

    c = sqlite3.connect(":memory:")
    c.execute('CREATE TABLE distro (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT)')

    for name in 'Ubuntu Fedora Puppy DSL SuSE'.split():
    c.execute('INSERT INTO distro (name) VALUES (?)', [ name ] )

    desired_ids = ["1", "2", "5", "47"]
    result_set = c.execute('SELECT * FROM distro WHERE id IN (%s)' % (", ".join(desired_ids)), ())
    for result in result_set:
    print result


    It prints out:


    (1, u'Ubuntu') (2, u'Fedora') (5, u'SuSE')
    ​

    As the docs state that "[y]ou shouldn’t assemble your query using Python’s string operations because doing so is insecure; it makes your program vulnerable to an SQL injection attack," I am hoping to use parameter substitution.

    When I try:

    result_set = c.execute('SELECT * FROM distro WHERE id IN (?)', [ (", ".join(desired_ids)) ])


    I get an empty result set, and when I try:

    result_set = c.execute('SELECT * FROM distro WHERE id IN (?)', [ desired_ids ] )


    I get:


    InterfaceError: Error binding parameter 0 - probably unsupported type.
    ​

    While I hope that any answer to this simplified problem will work, I would like to point out that the actual query I want to perform is in a doubly-nested subquery. To wit:

    UPDATE dir_x_user SET user_revision = user_attempted_revision
    WHERE user_id IN
    (SELECT user_id FROM
    (SELECT user_id, MAX(revision) FROM users WHERE obfuscated_name IN
    ("Argl883", "Manf496", "Mook657") GROUP BY user_id
    )
    )

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