ext.declarative import declarative_base from sqlalchemy import Column, Integer, String, DateTime, Boolean engine = create_engine('mysql+pymysql://username:passwd@localhost:port/db?charset=utf8', max_overflow=5) # max_overflow 最多多几个连接 Base = declarative_base() Session = sessionmaker(bind...
engine=create_engine("mysql+pymysql://root:password@localhost:3306/test",echo=True) from sqlalchemy import func, or_, not_ user = User(name='a') session.add(user) user = User(name='b') session.add(user) user = User(name='a') session.add(user) user = User() session.add(user)...
import pandas as pd from sqlalchemy import create_engine import pymysql # 导入必要三模块 # 查询语句,选出customer2018表中的所有数据 sql = 'select * from customer2018;' df = pd.read_sql_query(sql, engine) # read_sql_query的两个参数: sql语句, 数据库连接 df = pd.read_sql_query(sql, ...
fromsqlalchemyimportcreate_engineengine=create_engine('mysql+pymysql://username:password@localhost/dbname') 2. 定义模型 在SQLAlchemy中,我们使用模型来表示数据库表。以下是一个定义模型的示例代码: fromsqlalchemy.ext.declarativeimportdeclarative_basefromsqlalchemyimportColumn,Integer,StringBase=declarative_base(...
sql=""" create table user( id int PRIMARY KEY auto_increment, username VARCHAR(20), password VARCHAR(20), address VARCHAR(35) ) """cursor.execute(sql) conn.commit() cursor.close() conn.close() AI代码助手复制代码 3.执行查询: importpymysql#创建连接conn=pymysql.connect(host="localhost",...
前面说了,使用SQLAlchemy可以实现不同数据库的统一模型的处理,我们可以对应创建不同数据库的连接(engine),如下是常规几种关系型数据库的连接处理。 # mysql 数据库引擎 engine = create_engine( "mysql+pymysql://root:123456@127.0.0.1:3306/WinFramework", pool_recycle=3600, # echo=True, ) # Sqlite 数据...
from sqlalchemy import create_engine engine = create_engine('mysql+pymysql://youruser:yourpassword@yourip:yourport/yourschema?charset=utf8') 1. 2. 建立一个connection连接到database connection = engine.connect() 1. 如果不建立这个connection,后面没法执行sql语句 ...
pip3 install mysqlclient 1. 2. 连接数据库 创建py文件写入下面的内容: #coding=utf-8 from sqlalchemy import create_engine engine = create_engine('mysql+mysqldb://root:@localhost:3306/blog') engine.execute('select * from user').fetchall() ...
MySQL-connector-python 代码语言:javascript 代码运行次数:0 运行 AI代码解释 engine = create_engine('mysql+mysqlconnector://scott:tiger@localhost/foo') OurSQL 代码语言:javascript 代码运行次数:0 运行 AI代码解释 engine = create_engine('mysql+oursql://scott:tiger@localhost/foo') More notes on connec...