python中sql语句的语法

Question

我有这个代码通过python在Sql-DB中保存一些值。但它不起作用。你能帮我找到问题吗？

def saveValue(art, value, timestamp):
    # Missing: Check if table setting exists or create it
    # First check if row exists
    cursor.execute('SELECT count(*) FROM setting WHERE parameter=%s', art)
    existing = cursor.fetchone()
    if existing[0]==0:
        cursor.execute('INSERT INTO setting (parameter, wert) VALUES (%s, NULL)', art)
        db.commit()
    # Update row
    cursor.execute('UPDATE setting set value=%s WHERE parameter=%s', value, art)
    db.commit()

    # Check if measure-table exisits or create ist
    cursor.execute('SHOW TABLES LIKE measure_%s', art)
    result = cursor.fetchone()
    if not result:
        cursor.execute('CREATE TABLE measure_%s (id INT NOT NULL AUTO_INCREMENT, time int(11), value float(6), PRIMARY KEY (id))', art)
        db.commit()
    # Insert measure value
    sql = 'INSERT INTO measure_%s (time, value) VALUES (%s, %s)'
    args= art, timestamp, value
    cursor.execute(sql,args)
    db.commit()

也许甚至可以优化/最小化代码？