sqlalchemy的数据库连接与验证

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sqlalchemy连接数据库

安装pymysql

pip install pymysql

安装sqlalchemy

pip install sqlalchemy

连接数据库

'''
this is sqlalchemy
'''
from sqlalchemy import create_engine

HOSTNAME = '192.168.31.105'
PORT = '3306'
DATABASE = 'mydb'
USERNAME = 'admin'
PASSWORD = 'Root110qwe'

db_url = 'mysql+pymysql://{}:{}:@{}/{}?charset=utf8'.format(
    USERNAME,
    PASSWORD,
    HOSTNAME,
    DATABASE,
)

engine = create_engine(db_url)
#创建对象
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base(engine)

#创建会话  增删改查
from sqlalchemy.orm import sessionmaker
Session = sessionmaker(engine)
session = Session()


if __name__=='__main__':
    print(dir(engine))
    print('----Base----:',dir(Base))
    print('----Session----:',dir(Session))

输出结果：

['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_connection_cls', '_echo', '_execute_clauseelement', '_execute_compiled', '_execute_default', '_execution_options', '_has_events', '_optional_conn_ctx_manager', '_run_visitor', '_should_log_debug', '_should_log_info', '_trans_ctx', '_wrap_pool_connect', 'begin', 'connect', 'contextual_connect', 'create', 'dialect', 'dispatch', 'dispose', 'driver', 'drop', 'echo', 'engine', 'execute', 'execution_options', 'has_table', 'logger', 'logging_name', 'name', 'pool', 'raw_connection', 'run_callable', 'scalar', 'schema_for_object', 'table_names', 'transaction', 'update_execution_options', 'url']