我正在使用 SQLAlchemy 将数据插入 MySQL 数据库并进行查询。当我这样做时
result = db.engine.execute(query).fetchall()
它给了我看起来像这样的元组列表
结果 = [(1, 加拿大, 多伦多,...), (2, 加拿大, 温哥华,...),...]
我想了解当我将每个元组更改为字典时,python 如何正确分配适当的键。
这是我的Python代码:
with open('static/db/final_cities_countries.json') as f:
data = json.load(f)
# if data exists grab data, if not query again and store into db, then grab data
query = db.select([Aqi]).where(Aqi.Country == country)
result = db.engine.execute(query).fetchall()
if len(result) < 1:
list_of_cities = data[country]
for city in list_of_cities:
# store into db if aqi_call is ONLY successful with status:ok
if get_aqi(city) != None:
aqi_response = get_aqi(city)
lat = aqi_response['data']['city']['geo'][0]
lng = aqi_response['data']['city']['geo'][1]
time = aqi_response['data']['time']['s']
# creating instance of Aqi class(row in MySQL table) and inserting into aqi table
aqi_data = Aqi(country, city, aqi_response['data']['aqi'], lat, lng, time)
db.session.add(aqi_data)
db.session.commit()
# this time it will have more
query = db.select([Aqi]).where(Aqi.Country == country)
# result = [(id, country, city,...), (id, country, city,...), ...etc.]
result = db.engine.execute(query).fetchall()
# sending back list of dictionaries. [{id:x, country:y, city:z,...}, {},{},...]
return jsonify([dict(row) for row in result])
当我更改每个元组时,它会正确返回
[{id:1, 国家/地区: 加拿大, 城市: 多伦多,...}, {id:2, 国家/地区:加拿大, 城市: 温哥华,...},...]
当将元组转换为字典时,我们从未指定键名称,它是如何知道的?
最佳答案
它们不是普通的元组
,而是RowProxy
行为类似于元组和有序映射的实例。字符串键源自查询中的列名称。
关于python - 将元组更改为字典,它如何正确设置键值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57234885/