有没有办法将 class 实例存储到数据库中？ Python

Question

I'm currently looking for a way to store class instances within a database, specifically an sqlite3 one. I know that class instances can be stored within lists, as an example:

class Foo:
    def __init__(self):
        self.foo1 = 0

    def increment(self):
        self.foo1 += 1

foo = Foo()
foo2 = Foo()

foo_list = []

print(foo.foo1) # 0
foo.increment()
print(foo.foo1) # 1

foo_list.append(foo)
foo_list.append(foo2)

print(foo_list) # [<__main__.Foo object at 0x000001A53B3AD4E0>, <__main__.Foo object at 0x000001A53B3AD810>] <- the desired output

But the problem is: lists are temporary in the sense that they're cleared once the script is offline - and I'm working with a bot, which is prone to being taken down for maintenance at any given moment; I don't want to keep initializing those instances each time I bring my bot down for maintenance.

What I'd like is for my database to supply me with something like <__main__.Foo object at 0x000001A53B3AD4E0> when queried, an instance which I can make modifications to and be able to check any current values within this instance which have been modified in the past.

Any help would greatly suffice, and please do supply some code with any helpful responses:)

Thanks in advance.

Answer 1

I recommend learning about Object Relational Mapping libraries such as sqlalchemy . This won't store the instance directly, but instead store fields of the instance as columns in the database table.

If you are doing this in a webapp, django comes with an ORM that interacts with the web framework.