[sqlalchemy] Re: Self referencing keys
would this work? users = Table(users, metadata, Column(id,Integer,primary_key=True), Column(username, String(50),unique=True, nullable=False), Column(password, String(255)), Column(email, String(255),unique=True, nullable=False), Column(firstname, String(255)), Column(lastname, String(255)), Column(modifiedby_id, Integer, ForeignKey(users.id)) Column(modifiedon,DateTime(timezone=True), default=func.now()), On Sep 3, 6:50 pm, voltron [EMAIL PROTECTED] wrote: Excuse the newbie question, how does one declare a sef-referencing key? I would like to have fields modified_by and created_by in my users table, the field should refer back to the user id or user name in the same table. Thanks --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Self referencing keys
On Monday 03 September 2007 19:57:54 voltron wrote: would this work? users = Table(users, metadata, Column(id,Integer,primary_key=True), Column(username, String(50),unique=True, nullable=False), Column(password, String(255)), Column(email, String(255),unique=True, nullable=False), Column(firstname, String(255)), Column(lastname, String(255)), Column(modifiedby_id, Integer, ForeignKey(users.id)) Column(modifiedon,DateTime(timezone=True), default=func.now()), On Sep 3, 6:50 pm, voltron [EMAIL PROTECTED] wrote: Excuse the newbie question, how does one declare a sef-referencing key? I would like to have fields modified_by and created_by in my users table, the field should refer back to the user id or user name in the same table. Thanks yes, foreign key + eventualy use_alter=True if u get cyclic --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Self referencing keys
A pointing to A, is cyclical dependency. same as A - B - A. but in latter case u must choose one of the links to be added later, that is use_later=True for ForeignKey. in former case the table declaration may or may not work without use_alter. in both cases u need post_update=True for the relation/mapper of the loop-closing link of your choice. On Tuesday 04 September 2007 00:21:06 you wrote: Thanks for the reply, what do you mean by cyclic? On Sep 3, 9:00 pm, [EMAIL PROTECTED] wrote: On Monday 03 September 2007 19:57:54 voltron wrote: would this work? users = Table(users, metadata, Column(id,Integer,primary_key=True), Column(username, String(50),unique=True, nullable=False), Column(password, String(255)), Column(email, String(255),unique=True, nullable=False), Column(firstname, String(255)), Column(lastname, String(255)), Column(modifiedby_id, Integer, ForeignKey(users.id)) Column(modifiedon,DateTime(timezone=True), default=func.now()), On Sep 3, 6:50 pm, voltron [EMAIL PROTECTED] wrote: Excuse the newbie question, how does one declare a sef-referencing key? I would like to have fields modified_by and created_by in my users table, the field should refer back to the user id or user name in the same table. Thanks yes, foreign key + eventualy use_alter=True if u get cyclic --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
