数据未插入数据库-Python

Question

我想使用python向数据库添加一些数据，但是我遇到了问题。一个表中的数据已成功插入，但另一表有问题。

有两个表vehicles和vehicle_price如下：

我的代码如下：

def insert_vehicles_to_db(vehicle):
    conn = db_connection()
    cur = conn.cursor()
    if vehicle_not_exists(vehicle, conn, cur):
        try:
            insert_vehicle(vehicle, conn, cur)
            insert_vehicle_price(vehicle, conn, cur)
        except Exception as e:
            pass
    conn.close()

函数insert_vehicle如下：

def insert_vehicle(vehicle, conn, cur):
    try:
        query = "INSERT INTO vehicles (reference, data, price, reference_url, timestamp) VALUES (%s, %s, %s, %s, %s);"
        cur.execute(query, (vehicle['reference'], "", vehicle['price'], vehicle['reference_url'], datetime.datetime.now()))
        conn.commit()

    except Exception as e:
        pass

那很好，车辆总是插入的。但是问题出在下一个insert_vehicle_price中，如下所示：

def insert_vehicle_price(vehicle, conn, cur):
    try:
        vehicle_data = get_vehicles(vehicle['reference'], vehicle['reference_url'], conn, cur)[0]  # get the last vehicle
        vehicle_id = vehicle_data[0]
        vehicle_price = Decimal(vehicle['price'] + ".00")

        query = "INSERT INTO vehicle_price (price, timestamp, vehicle_id) VALUES (%s, %s, %s);"
        cur.execute(query, (vehicle_price, datetime.datetime.now(), vehicle_id))
        conn.commit()
    except Exception as e:
        pass

因此由于某些原因未插入价格。

知道为什么吗？

更新

函数get_vehicles如下所示：

def get_vehicles(reference, reference_url, conn, cur):
    try:
        sql_get_vehicles = "SELECT * FROM vehicles WHERE reference = %s and reference_url = %s"
        cur.execute(sql_get_vehicles, (reference, reference_url))
        return cur.fetchall()
    except Exception as e:
        # TODO Handle error
        pdb.set_trace()
        pass