# ca_core/metadata.py

def get_name(cursor):
    cursor.execute("SELECT name FROM metadata LIMIT 1")
    row = cursor.fetchone()
    return row['name'] if row else None


def set_name(cursor, value):
    cursor.execute("UPDATE metadata SET name=%s", (value,))


def get_comment(cursor):
    cursor.execute("SELECT comment FROM metadata LIMIT 1")
    row = cursor.fetchone()
    return row['comment'] if row else None


def set_comment(cursor, value):
    cursor.execute("UPDATE metadata SET comment=%s", (value,))


def get_public_key(cursor):
    cursor.execute("SELECT public_key FROM metadata LIMIT 1")
    row = cursor.fetchone()
    return row['public_key'] if row else None


def get_private_key(cursor):
    cursor.execute("SELECT private_key FROM metadata LIMIT 1")
    row = cursor.fetchone()
    return row['private_key'] if row else None


def set_keys(cursor, public_key, private_key):
    cursor.execute(
        "UPDATE metadata SET public_key=%s, private_key=%s",
        (public_key, private_key)
    )