Question

如何在SQLAlchemy中表示此查询？

string query = "SELECT SUM(See) AS [All]
 , (
       SELECT TOP 1 See
       FROM StateSite
       WHERE StatDate = @StatDate
   ) AS [Now]
 , (
       SELECT TOP 1 See
       FROM StateSite
       WHERE StatDate = @Yesterday
   ) AS [Last]
 , (
       SELECT SUM(See)
       FROM (
           SELECT TOP 7 *
           FROM StateSite
           ORDER BY id DESC
       )
   ) AS [week]
FROM StateSite";

Answer 1

Mb，我不明白你的意思是数据库类型。如果它是映射表，您可以像这样迭代列：

for c in foo.__table__.columns:
    print(c.type)

Answer 2

def get_data_types(model):
'''return dictionary with column name as key and data type as value'''
    d = {}
    for c in model.__table__.columns:
        d[str(c.name)] = str(c.type)

    return d

其中model是sqlalchemy orm表。

如何从SQLAlchemy获取现有命名表的列类型

2 个答案: