[英]How can I select all rows with sqlalchemy?
我試圖從表中獲取所有行。
在控制器我有:
meta.Session.query(User).all()
結果是[, ]
,但我在這個表中有2行。
我在表中使用這個模型:
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
接下來,在同一個文件中:
class User(object):
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()
orm.mapper(User, t_user)
您可以輕松導入模型並運行:
from models import User
# User is the name of table that has a column name
users = User.query.all()
for user in users:
print user.name
我使用以下代碼段來查看表中的所有行。 使用查詢查找所有行。 返回的對象是類實例。 它們可用於根據需要查看/編輯值:
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine, Sequence
from sqlalchemy import String, Integer, Float, Boolean, Column
from sqlalchemy.orm import sessionmaker
Base = declarative_base()
class MyTable(Base):
__tablename__ = 'MyTable'
id = Column(Integer, Sequence('user_id_seq'), primary_key=True)
some_col = Column(String(500))
def __init__(self, some_col):
self.some_col = some_col
engine = create_engine('sqlite:///sqllight.db', echo=True)
Session = sessionmaker(bind=engine)
session = Session()
for class_instance in session.query(MyTable).all():
print(vars(class_instance))
session.close()
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