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[英]how to get all the rows present in table using sql query where year is a leap year
[英]How to query all rows of a table
我正在將 Python Sqlalchemy 用於 MYSQL 數據庫。 我編寫了以下腳本來創建類對象,然后在表中添加了一些行。
from sqlalchemy import create_engine, MetaData, Table, Column, ForeignKey
from sqlalchemy.dialects.mysql.base import VARCHAR, LONGTEXT, INTEGER
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
engine = create_engine("mysql+mysqldb://root:@localhost/mydb")
connection = engine.connect()
Session = sessionmaker(bind=engine)
session = Session()
Base = declarative_base()
metadata = MetaData()
class User(Base):
__tablename__ = 'User'
id = Column('id', INTEGER(display_width=11), primary_key=True, nullable=False)
email = Column('email', VARCHAR(charset='utf8mb4', collation='utf8mb4_0900_ai_ci', length=100), unique=True)
password = Column('password', VARCHAR(charset='utf8mb4', collation='utf8mb4_0900_ai_ci', length=45))
name = Column('name', VARCHAR(charset='utf8mb4', collation='utf8mb4_0900_ai_ci', length=100))
現在,我需要從“用戶”表中獲取所有行,所以我這樣做:
user = session.query(User).all()
print(user)
但我得到的輸出不是表格數據而是這個:
[<__main__.User object at 0x7f10b0c6ebe0>, <__main__.User object at 0x7f10b0c6ec50>]
我如何從表中獲取實際數據? 任何幫助,將不勝感激
您將獲得的輸出是一個記錄元組。 所以,使用循環
users = session.query(User).all()
for user in users:
print (user)
print (user.id, user.email, user.password, user.name)
您應該在 User 類中編寫 __str__ 方法,例如:
class User(Base):
...
def __str__(self):
str_out = 'id={} email={} password={} name={}'
str_formated = str_out.format(self.id,self.email,self.password,self.name)
return str_formated
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