对象实例存储数据库ZODB(查询对象可以存储数据吗)

对于面向对象数据库，对象关系数据库， 对象数据库，大家可能非常疑惑， 我也不能完全明白， 最大的原因是现在这方面的理论支持和标准还不是很完善。我对对象数据库理解是用来保存类实例的数据库， 是数据持久化的解决方案。

ZODB 是Z Object Database. 是python用于数据持久化的模块。

​​pip install ZODB​​

本地文件保存类实例测试类

from persistent import Persistent

class Host(Persistent):
    user = None
    password = None
    times = 1

    def __init__(self, user, password, times):
        self.user = user
        self.password =password
        self.times = times

    def run(self):
        print('user: {}'.format(self.user))
        print('password: {}'.format(self.password))

        for i in range(1, self.times + 1):
            print('hello command {}'.format(i))

写类实例

import transaction
from ZODB import FileStorage, DB
storage = FileStorage.FileStorage('rock.db')
db = DB(storage)
connection = db.open()
root = connection.root()

root['rock'] = Host('rock', '123456', 2)
root['sandy'] = Host('sandy', '654321', 3)

transaction.commit()
connection.close()
db.close()
storage.close()

读类实例并执行方法

from ZODB import FileStorage, DB
storage = FileStorage.FileStorage('rock.db')
db = DB(storage)
connection = db.open()
root = connection.root()

root['rock'].run()

connection.close()
db.close()
storage.close()

output:

user: rock
password: 123456
hello command 1
hello command 2

远端数据库ZEO保存类实例

ZEO: Zope Enterprise Objects

​​pip install ZEO​​

搭建ZEO Server命令行：​

runzeo -a 0.0.0.0:52200 -f rock.db

配置文件

<zeo>
  address 0.0.0.0:52200
</zeo>

<filestorage>
  path /root/rock.db
</filestorage>

<eventlog>
  <logfile>
    path /root/zeo.log
    format %(asctime)s %(message)s
  </logfile>
</eventlog>

runzeo --configure zeo.xml

写类实例

import transaction
from ZODB import FileStorage, DB
from ZEO import ClientStorage

storage = ClientStorage.ClientStorage(('10.207.69.19', 52200))
db = DB(storage)
connection = db.open()
root = connection.root()

root['rock'] = Host('rock', '123456', 1)
root['sandy'] = Host('sandy', '654321', 2)

transaction.commit()
connection.close()
db.close()
storage.close()

读类实例并执行方法

import transaction
from ZODB import FileStorage, DB
from ZEO import ClientStorage

storage = ClientStorage.ClientStorage(('10.207.69.19', 52200))
db = DB(storage)
connection = db.open()
root = connection.root()

root['rock'].run()

transaction.commit()
connection.close()
db.close()
storage.close()

output:

user: rock
password: 123456
hello command 1

对比关系型数据库，这个是不是很帅气！