Question

绝对是初学者。我在连接到使用postgres.app和sqlalchmey在macosx机器上本地运行的postgresql数据库时遇到问题：

导入psycopg2 import sqlalchemy

engine = sqlalchemy.create_engine（'postgresql：//localhost/practice.db'） engine.connect（）

返回： OperationalError：（OperationalError）致命错误：数据库“practice.db”不存在无无

谢谢，埃文

Answer 1

您必须先创建该数据库，然后才能create_engine

from urlparse import urlparse, urlunparse

def recreate_db(url):
    parsed = urlparse(url)
    #parse url so you know host 
    host_url = urlunparse((parsed.scheme, parsed.netloc, '/', '', '', ''))

    #create_engine without database name
    engine = create_engine(host_url, convert_unicode=True)
    dbname = parsed.path.strip('/')
    engine.execute('commit')
    try:
        #drop (and clean) database if it exists with raw query
        engine.execute('drop database `%s`;'%dbname)
        engine.execute('commit')
    except OperationalError:
        pass

    #create database
    engine.execute('create database `%s` default character set utf8 ;'%dbname)
    engine.execute('commit')
    print 'Done cleanup'

使用sqlalchemy连接到本地postgresql

1 个答案: