name 'BoundMetaData' is not defined

Question

I got the tutorial

http://www.rmunn.com/sqlalchemy-tutorial/tutorial.html

When I compile got the error message

The debugged program raised the exception unhandled NameError
"name 'BoundMetaData' is not defined"

I am use the latest sqlAlchemy .

How Could I fixed this?

After read this I modified to my own for latest version sqlAlchemy:

from sqlalchemy import *
engine = create_engine('mysql://root:mypassword@localhost/mysql')
metadata = MetaData()
users = Table('users', metadata,
    Column('user_id', Integer, primary_key=True),
    Column('name', String(40)),
    Column('age', Integer),
    Column('password', String),
)
metadata.create_all(engine) 
i = users.insert()
i.execute(name='Mary', age=30, password='secret')
i.execute({'name': 'John', 'age': 42},
          {'name': 'Susan', 'age': 57},
          {'name': 'Carl', 'age': 33})
s = users.select()
rs = s.execute()
row = rs.fetchone()
print 'Id:', row[0]
print 'Name:', row['name']
print 'Age:', row.age
print 'Password:', row[users.c.password]
for row in rs:
    print row.name, 'is', row.age, 'years old

It raise error

 raise exc.DBAPIError.instance(statement, parameters, e, connection_invalidated=is_disconnect)
sqlalchemy.exc.ProgrammingError: (ProgrammingError) (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' ntPRIMARY KEY (user_id)n)' at line 5") 'nCREATE TABLE users (ntuser_id INTEGER NOT NULL AUTO_INCREMENT, ntname VARCHAR(40), ntage INTEGER, ntpassword VARCHAR, ntPRIMARY KEY (user_id)n)nn' ()

Asked By: kn3l

||

Source

Answer 1

This tutorial is for SQLAlchemy version 0.2. Since the actual version is 0.5.7, I’d say the tutorial is severely outdated.

Try the official one instead.

EDIT:

Now you have a completely different question. You should’ve asked another question instead of editing this one.

Your problem now is that

Column('password', String),

Doesn’t specify a size for the column.

Try

Column('password', String(20)),

Instead.

Answered By: nosklo

Answer 2

I believe you need to specify the length of your password field.

Column('password', String(100))

MySQL does not allow unbounded varchar columns. If you need that, use the sqlalchemy datatype Text instead.

Answered By: codeape

Answer 3

The fix for the tutorial is to just use MetaData instead of BoundMetaData. BoundMetaData is deprecated and replaced with MetaData.

And to avoid getting such error in future, Try the official one instead,
as Nosklo said.

from sqlalchemy import *

db = create_engine('sqlite:///tutorial.db')

db.echo = False  # Try changing this to True and see what happens

metadata = MetaData(db)

"""
  Continue with the rest of your Python code
"""

Answered By: shashaDenovo

name 'BoundMetaData' is not defined

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