sqlalchemy链接数据库

from sqlalchemy import create_engine

HOSTNAME = '127.0.0.1'

PORT = 3306

DATABASE = 'first_sqlalchemy'

USERNAME = 'root'

PASSWORD = '123456'

#dialect+driver://username:password@host:port/database
DB_URI = "mysql+pymysql://{username}:{password}@{host}:{port}/" \
         "{db}?charset=utf8".format(username=USERNAME,password=PASSWORD,host=HOSTNAME,port=PORT,db=DATABASE)

engine = create_engine(DB_URI)

#判断是否链接成功

conn = engine.connect() #链接成功获取操作数据库的指针

result = conn.execute('select 1')

print(result.fetchone())#提取一条结果