[sqlalchemy] Re: creating tables dynamically
That shouldn't be too hard... When creating a Table as shown in the tutorial, you can provide any number of columns. You can later modify an existing Table object; there's an append_column method. See: http://www.sqlalchemy.org/docs/reference/sqlalchemy/schema.html#tables-and-columns Nebur -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
[sqlalchemy] SQLAlchemy+pymssql unicode problem
Hi everyone, I'm trying to write a small script to get all the table names from SQLServer database (with pymssql). Up to now the script is really simple: engine = create_engine(mssql+pymssql://user:passw...@db_host/ db_name, encoding=cp1252) metadata = MetaData(engine, reflect=True) tabs = metadata.tables.keys() print tabs When I try to run this script I get the following error: Traceback (most recent call last): File DBScript.py, line 12, in module metadata = MetaData(engine, reflect=True) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy \schema.py, line 1788, in __init__ self.reflect() File D:\Program Files\Python26\Lib\site-packages\sqlalchemy \schema.py, line 1915, in reflect Table(name, self, **reflect_opts) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy \schema.py, line 207, in __new__ table._init(name, metadata, *args, **kw) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy \schema.py, line 261, in _init reflecttable(self, include_columns=include_columns) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy\engine \base.py, line 1776, in reflecttable self.dialect.reflecttable(conn, table, include_columns) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy\engine \default.py , line 217, in reflecttable return insp.reflecttable(table, include_columns) File D:\Program Files\Python26\lib\site-packages\sqlalchemy\engine \reflection .py, line 411, in reflecttable raise exc.NoSuchTableError(table.name) sqlalchemy.exc.NoSuchTableError I found that this error is due to a table in my DB called Attività, so I believe that it is related to a unicode issue. Does anyone have any idea about this error? Thanks in advance for your help! -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
Re: [sqlalchemy] SQLAlchemy+pymssql unicode problem
The version of SQLAlchemy and pymssql is very significant here.Older pymssqls didn't really support unicode at all. The current one, unclear, we have basic dialect support for the latest pymssql in 0.6 but it hasn't been strongly tested. There is of course very good support for pyodbc which runs on all platforms. On Jul 23, 2010, at 7:42 AM, Massi wrote: Hi everyone, I'm trying to write a small script to get all the table names from SQLServer database (with pymssql). Up to now the script is really simple: engine = create_engine(mssql+pymssql://user:passw...@db_host/ db_name, encoding=cp1252) metadata = MetaData(engine, reflect=True) tabs = metadata.tables.keys() print tabs When I try to run this script I get the following error: Traceback (most recent call last): File DBScript.py, line 12, in module metadata = MetaData(engine, reflect=True) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy \schema.py, line 1788, in __init__ self.reflect() File D:\Program Files\Python26\Lib\site-packages\sqlalchemy \schema.py, line 1915, in reflect Table(name, self, **reflect_opts) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy \schema.py, line 207, in __new__ table._init(name, metadata, *args, **kw) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy \schema.py, line 261, in _init reflecttable(self, include_columns=include_columns) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy\engine \base.py, line 1776, in reflecttable self.dialect.reflecttable(conn, table, include_columns) File D:\Program Files\Python26\Lib\site-packages\sqlalchemy\engine \default.py , line 217, in reflecttable return insp.reflecttable(table, include_columns) File D:\Program Files\Python26\lib\site-packages\sqlalchemy\engine \reflection .py, line 411, in reflecttable raise exc.NoSuchTableError(table.name) sqlalchemy.exc.NoSuchTableError I found that this error is due to a table in my DB called Attività, so I believe that it is related to a unicode issue. Does anyone have any idea about this error? Thanks in advance for your help! -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
[sqlalchemy] Adding a Column dynamically using a metaclass
I am trying to add a Column definition using a metaclass but things aren't working as expected I am using something like the code below class MyMeta(DeclarativeMeta): def __init__(cls, name, bases, attrdict): setattr(cls, 'title', Column(types.String(80)) DeclarativeMeta.__init__(cls, name, bases, attrdict) Base = declarative_base(metaclass=MyMeta) class BasicModel(Base): __tablename__ = 'basic' id = Column(types.Integer, primary_key=True, autoincrement=True) identifier = Column(types.String(40)) but the title Column does not seems to be included in the BasicModel class. Any idea what's wrong? -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
Re: [sqlalchemy] Adding a Column dynamically using a metaclass
On Jul 23, 2010, at 2:07 PM, cropr wrote: I am trying to add a Column definition using a metaclass but things aren't working as expected I am using something like the code below class MyMeta(DeclarativeMeta): def __init__(cls, name, bases, attrdict): setattr(cls, 'title', Column(types.String(80)) DeclarativeMeta.__init__(cls, name, bases, attrdict) Base = declarative_base(metaclass=MyMeta) class BasicModel(Base): __tablename__ = 'basic' id = Column(types.Integer, primary_key=True, autoincrement=True) identifier = Column(types.String(40)) but the title Column does not seems to be included in the BasicModel class. Any idea what's wrong? Use regular mixins. See http://www.sqlalchemy.org/docs/reference/ext/declarative.html#mixin-classes . If for some reason you don't want to do that, using your recipe above, add the column to attrdict. See http://www.sqlalchemy.org/trac/wiki/UsageRecipes/DeclarativeMixins for an example. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
[sqlalchemy] Re: creating tables dynamically
Thank you for taking the time to reply. The application I am writing takes input from the user to define the table name, number of columns, types etc... I tried formatting the inputs in a list and then passing the list elements to Table(). I kept getting error messages. I abandoned this approach and simply used basic SQL expression to get this done. It works. Again thank you for the response. On Jul 23, 3:47 am, Nebur g...@reifenberg.de wrote: That shouldn't be too hard... When creating a Table as shown in the tutorial, you can provide any number of columns. You can later modify an existing Table object; there's an append_column method. See:http://www.sqlalchemy.org/docs/reference/sqlalchemy/schema.html#table... Nebur -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
[sqlalchemy] sqlalchemy and desktop apps
Hello, I'm a happy user of sqlalchemy on small personal projects of my own (http://bitbucket.org/jbmohler/pyhacc is one of them which is not ready for use yet). At my day job we are in the process of evaluating platforms for a rewrite of our small business accounting system. We expect this rewrite to have 200k-300k LOC and sqlalchemy stands up well in many ways to some of the C# alternatives we are considering. The notion of writing the entire project in python is quite daunting to management who is new to opensource. I'm wondering if anyone would be kind enough to give an example of a large desktop app written in sqlalchemy (even better if it's using PyQt for the gui). We're pondering the viability of such a project in python. In particular, we do a fair bit of document logic client side with several hundred line invoice documents which we wish to edit as a whole locally and send back to the server on an explicit user save command. This is something which I wouldn't expect to typically be needful in a web application. I can certainly find examples of large websites on python via django, but desktop business applications are a bit harder to come by. I believe that eric4 is a good example but I was hoping for a largish project involving sqlalchemy as well. Thanks, Joel -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
