import sqlalchemy from sqlalchemy import create_engine from sqlalchemy.engine.base import Engine engine = create_engine( "mysql+pymysql://root:123@127.0.0.1:3306/t1?charset=utf8", max_overflow=0, # 超过连接池大小外最多创建的连接 pool_size=5, # 连接池大小 pool_timeout=30, # 池中没有...
3. 使用连接池 使用SQLAlchemy的连接池功能也能有效避免连接超时问题。这是通过配置池大小、超时等实现的。以下是一个代码示例: fromsqlalchemyimportcreate_engine engine=create_engine('mysql://username:password@localhost/dbname',pool_size=10,# 最大连接数max_overflow=20,# 溢出连接数pool_timeout=30# 连接...
fromsqlalchemyimportcreate_engine,Column,Integer,StringclassPerson(Base):__tablename__='person'#表名#第二步:定义字段对象id = Column(Integer,primary_key=True,autoincrement=True) name= Column(String(50)) age= Column(Integer) 第四步:将自己定义的ORM类映射到数据库中 Base.metadata.create_all() ...
1 from sqlalchemy import Column,Integer,String,ForeignKey 2 #from database import Base 3 from sqlalchemy.ext.declarative import declarative_base 4 from sqlalchemy import create_engine 5 from sqlalchemy.orm import scoped_session,sessionmaker,relationship 6 7 8 engine=create_engine('sqlite:///dan....
engine = create_engine('mysql+pymysql://root:123456@127.0.0.1:3306/people',echo=True) engine.connect() 这样我们就算与People数据库建立连接了,接下来我们来建立一张表。 4).创建连接多个数据库 app.config['SQLALCHEMY_BINDS']={ 'users': "mysql+pymysql://root:123456@127.0.0.1:3306/user", ...
engine = create_engine(DB_URI) #创建连接 with engine.connect() as con: rs = con.execute('SELECT 1') print rs.fetchone() 首先从sqlalchemy中导入create_engine,用这个函数来创建引擎,然后用engine.connect()来连接数据库。其中一个比较重要的一点是,通过create_engine函数的时候,需要传递一个满足某种格...
Check the SQLAlchemy Documentation Installation Initialize the Extension Configure the Extension Define Models Create the Tables Query the Data What to Remember Configuration Configuration Keys Connection URL Format Default Driver Options Engine Configuration Precedence ...
如果您不使用 Flask-SQLAlchemy 扩展,您仍然可以轻松地使用会话: import sqlalchemy from sqlalchemy.orm import sessionmaker, scoped_session engine = sqlalchemy.create_engine('my connection string') Session = scoped_session(sessionmaker(bind=engine)) s = Session() result = s.execute('SELECT * FROM...
from sqlalchemy.orm import sessionmaker DB_CONNECT_STRING = 'mysql+mysqldb://root:123@localhost/ooxx?charset=utf8'engine = create_engine(DB_CONNECT_STRING, echo=True)DB_Session = sessionmaker(bind=engine)session = DB_Session()7、数据操作（增删改查）代码如下：from sqlalchemy import...
from sqlalchemy import create_engine from sqlalchemy.ext.declarative import declarative_base from sqlalchemy import Column, Integer, String, Text, ForeignKey, DateTime, UniqueConstraint, Index from sqlalchemy.orm import relationship Base = declarative_base()# ### 单表⽰例 ### class Users(Base)...