首先,确保已经安装了SQLAlchemy和psycopg2包,可以使用以下命令进行安装:pip install SQLAlchemy psycopg2 在Python代码中导入SQLAlchemy和psycopg2库:from sqlalchemy import create_engine 创建一个PostgreSQL数据库连接引擎,指定数据库连接URL,包括用户名、密码、主机和数据库名称:engine = create_engine('postgresql:...
pip install psycopg2 或者使用以下命令来安装pg8000驱动: 代码语言:txt 复制 pip install pg8000 步骤3:创建连接 在代码中,你需要使用SQLAlchemy提供的create_engine函数来创建一个数据库连接。你需要指定PostgreSQL数据库的连接字符串,其中包括数据库的主机、端口、数据库名、用户名和密码等信息。以下是一个示例连接字...
import os from sqlalchemy import create_engine from sqlalchemy.orm import scoped_session, sessionmaker engine = create_engine("postgresql://postgres:114920@localhost/Databases") db = scoped_session(sessionmaker(bind=engine)) def main(): Railway = db.execute("SELECT origin, destination, duration F...
db_type="postgresql+psycopg2"ifcf.get("db","db_name"): db_name=cf.get("db","db_name")else: db_name="luoyun"ifcf.get("db","db_user"): db_user= cf.get("db","db_user")else: db_user="luoyun"ifcf.get("db","db_password"): db_password= cf.get("db","db_password")el...
db_type=postgresql+psycopg2 db_name=luoyun db_user=luoyun db_password=luoyun 4、初始化数据库 python manage.py importmodels fromlyormimportORMBase, dbengine,dbsession ORMBase.metadata.create_all(dbengine) frommodelsimportUser definit():
PostgreSQL:pip install psycopg2-binary MySQL:pip install mysql-connector-python 注意 安装mysqlclient对于新版本已经失效 基础使用 1. 创建数据库连接和会话 fromsqlalchemyimportcreate_enginefromsqlalchemy.ormimportsessionmaker# 创建数据库引擎engine = create_engine('mysql+mysqlconnector://username:password@host...
首先,需要导入SQLAlchemy的相关模块,并创建与数据库的连接。 python from sqlalchemy import create_engine, text 创建一个SQLAlchemy的engine对象: 使用create_engine方法创建数据库引擎,并连接到目标数据库。 python engine = create_engine('postgresql+psycopg2://username:password@localhost/database_name') 请将...
PostgreSQL psycopg2 postgresql://username:password@localhost:5432/database_name SQLite 不需要 sqlite:///example.db Oracle cx_Oracle oracle://username:password@localhost:1521/orcl 2.2.2 NoSQL数据库 数据库依赖连接字符串 MongoDB pymongo mongodb://username:password@localhost:27017/database_name CouchDB...
engine = create_engine("postgresql+psycopg2://user:pass@host/dbname") with engine.begin() as conn: savepoint = conn.begin_nested() conn.execute( some_table.insert(), [ {"data": "some data one"}, {"data": "some data two"}, {"data": "some data three"}, ], ) savepoint.commit...
from sqlalchemy import create_engine username = "postgres" # 用户名 password = "zgghyys123" # 密码 hostname = "localhost" # ip port = 5432 # 端口 db_type = "postgresql" # 数据库种类 driver = "psycopg2" # 驱动 database = "postgres" # 连接到哪个数据库 engine = create_engine(f"{db...