如何在MySQL数据库中保存python对象？
如何在MySQL数据库中保存python对象？
提问于 2018-06-29 03:10:47
我正在尝试使用python中的一个对象示例来创建一个数据库，但是我得到了类似这样的错误消息："AttributeError：'Eu‘object没有’translate‘属性“我不知道如何修复这个问题
对不起，伙计们，我的英语不是很好，下面是我的代码：
import pymysql.cursors
class Eu:
def __init__(self, nome='mel', idade=22):
self.nome = nome
self.idade = idade
eu = Eu()
nome = eu.nome
idade = eu.idade
# connect do database
conn = pymysql.connect(host='localhost',
user='root',
password='')
# create a cursor and a database
conn.cursor().execute('CREATE DATABASE banco73')
conn.cursor().execute('USE banco73')
# create tables
conn.cursor().execute('CREATE TABLE tabela73 (eu BLOB)')
# use tables
conn.cursor().execute("""INSERT INTO tabela73 VALUES (?)""", (eu))整个控制台消息：
runfile('C:/Users/Usuario/.spyder-py3/temp.py', wdir='C:/Users/Usuario/.spyder-py3')
Traceback (most recent call last):
File "<ipython-input-59-9994dddea11c>", line 1, in <module>
runfile('C:/Users/Usuario/.spyder-py3/temp.py', wdir='C:/Users/Usuario/.spyder-py3')
File "C:\Users\Usuario\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 880, in runfile
execfile(filename, namespace)
File "C:\Users\Usuario\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/Users/Usuario/.spyder-py3/temp.py", line 36, in <module>
conn.cursor().execute("""INSERT INTO tabela73 VALUES (?)""", (eu))
File "C:\Users\Usuario\Anaconda3\lib\site-packages\pymysql\cursors.py", line 168, in execute
query = self.mogrify(query, args)
File "C:\Users\Usuario\Anaconda3\lib\site-packages\pymysql\cursors.py", line 147, in mogrify
query = query % self._escape_args(args, conn)
File "C:\Users\Usuario\Anaconda3\lib\site-packages\pymysql\cursors.py", line 133, in _escape_args
return conn.escape(args)
File "C:\Users\Usuario\Anaconda3\lib\site-packages\pymysql\connections.py", line 839, in escape
return converters.escape_item(obj, self.charset, mapping=mapping)
File "C:\Users\Usuario\Anaconda3\lib\site-packages\pymysql\converters.py", line 27, in escape_item
val = encoder(val, mapping)
File "C:\Users\Usuario\Anaconda3\lib\site-packages\pymysql\converters.py", line 118, in escape_unicode
return u"'%s'" % _escape_unicode(value)
File "C:\Users\Usuario\Anaconda3\lib\site-packages\pymysql\converters.py", line 73, in _escape_unicode
return value.translate(_escape_table)
AttributeError: 'Eu' object has no attribute 'translate'回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-29 03:43:54
您不能将python对象直接存储在关系数据库中。您要做的是存储可用于在需要时重新生成对象的data。
有一些模块可以帮助你做到这一点。它们被称为ORM -对象关系模型
我推荐SQLAlchemy：
import sqlalchemy as sa
from sqlalchemy import Column, Integer, String, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
engine = create_engine('mysql://root:pwd@localhost/banco73')
Base = declarative_base(bind=engine)
Session = sessionmaker(bind=engine)
class Eu(Base):
__tablename__ = 'tabela73'
id = Column(Integer(), primary_key=True)
nome = Column(String(200))
idade = Column(Integer())
def __init__(self, nome='mel', idade=22):
self.nome = nome
self.idade = idade
Base.metadata.create_all()
# automatically generates a create table:
#CREATE TABLE tabela73 (
# id INTEGER NOT NULL,
# nome VARCHAR(200),
# idade INTEGER,
# PRIMARY KEY (id)
#)
eu = Eu()
session = Session()
session.add(eu)
session.commit() # automatically generates the insert:
#INSERT INTO tabela73 (nome, idade) VALUES ('mel', 22)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/51089821
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