python 使用 SQLAlchemy 获取最后一个插入 ID

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时间:2020-11-04 01:05:23  来源:igfitidea点击:

Getting last insert id with SQLAlchemy

pythonsqlalchemy

提问by gummmibear

I'm using SQLAlchemy

我正在使用 SQLAlchemy

import hashlib
import sqlalchemy as sa
from sqlalchemy import orm

from allsun.model import meta


t_user =  sa.Table("users",meta.metadata,autoload=True)

class Duplicat(Exception):
 pass
class LoginExistsException(Exception):
 pass
class EmailExistsException(Exception):
 pass

class User(object):
 """
 def __setattr__(self, key, value):
  if key=='password' :
   value=unicode(hashlib.sha512(value).hexdigset())
   object.__setattr__(self,key,value)
"""
 def loginExists(self):
  try:
   meta.Session.query(User).filter(User.login==self.login).one()
  except orm.exc.NoResultFound:
   pass
  else:
   raise LoginExistsException()

 def emailExists(self):
  try:
   meta.Session.query(User).filter(User.email==self.email).one()
  except orm.exc.NoResultFound:
   pass
  else:
   raise EmailExistsException()


 def save(self):
  meta.Session.begin()
  meta.Session.save(self)
  try:
   meta.Session.commit()
  except sa.exc.IntegrityError:
   raise Duplicat()

How can I get the last inserted id when I call:

调用时如何获取最后插入的 ID:

user = User()
user.login = request.params['login']
user.password = hashlib.sha512(request.params['password']).hexdigest()
user.email = request.params['email']
user.save()

回答by Denis Otkidach

You can access user.id(or whatever name you use for autoincremeted primary key field) after saving userobject. SQLAlchemy automatically fills fields assigned by database.

user.id保存user对象后,您可以访问(或用于自动增加主键字段的任何名称)。 SQLAlchemy 自动填充由数据库分配的字段。