使用pymysql和sqlalchemy在mysql中创建表

Question

我在使用python 3.3在mysql中创建表时遇到问题。 我正在使用Pymysql-0.15和SQLAlchemy。

目前，我正在Pythonwin中运行此代码，并具有以下输出。

from sqlalchemy imort *

    from sqlalchemy import *
    import pymysql
    engine = create_engine("mysql+pymysql://admin:admin@127.0.0.1/dbeerste")

    engine = create_engine("mysql+pymysql://admin:admin@127.0.0.1/dbeerste")
    metadata = MetaData(bind=engine)
    users_table = Table('users', metadata, Column('id', Integer, primary_key=True), Column('name', String(40)), Column('age', Integer), Column('password', String),)
    metadata.create_all(engine)

Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\schema.py", line 2740, in create_all
    tables=tables)
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\base.py", line 1489, in _run_visitor
    conn._run_visitor(visitorcallable, element, **kwargs)
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\base.py", line 1132, in _run_visitor
    **kwargs).traverse_single(element)
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\sql\visitors.py", line 109, in traverse_single
    return meth(obj, **kw)
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\ddl.py", line 56, in visit_metadata
    collection = [t for t in sql_util.sort_tables(tables)
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\ddl.py", line 57, in <listcomp>
    if self._can_create_table(t)]
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\ddl.py", line 35, in _can_create_table
    table.name, schema=table.schema)
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\dialects\mysql\base.py", line 2039, in has_table
    rs = connection.execute(st)
 File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\base.py", line 664, in execute
    params)
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\base.py", line 808, in _execute_text
    statement, parameters
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\base.py", line 878, in _execute_context
    context)
  File "C:\Python33\lib\site-packages\sqlalchemy-0.8.0b2-py3.3.egg\sqlalchemy\engine\base.py", line 1036, in _handle_dbapi_exception
    from e
sqlalchemy.exc.ProgrammingError: (ProgrammingError) (1146, "#42S02Table 'dbeerste.users' doesn't exist") b'DESCRIBE `users`' ()

annyone可以帮我解决这个问题吗？

Answer 1

您的代码看起来正确，但是MySQL要求您指定密码字段的长度。 修复该问题后，我能够对MySQL数据库执行查询，没问题。 如果仍然无法使用，则说明数据库服务器或驱动程序存在问题，因此您可以尝试重新安装这些内容。