Eric Emminger wrote: > > Max > > > I'm evaluating possibility on using an O-R mapping tool in my current > > project. I've read tutorial on torque and similar other O-R mapping tools and > > wonder how the migration is managed. > > > > Suppose, I've created a book database scheme, generate sql/java code and > > deploy it. Some time later when a lot of data 's been filled into DB I > > discovered that I had to add/change/remove some properties on the Book > > class. I could tweak the schema file and re-create sql/java code but how > > one typically perform migration data to new db scheme. > > > > An elaborate answer or pointers to relevant Web resources are greatly > > appreciated. > > As far as I know, no OR mapping tool, including Torque, has an easy way > to migrate data between changed models. Migration usually involves > either database-specific SQL code to change the existing database, or > creating a new database and moving the data. > > If you know or find anything that would change the above information, > please tell us, or at least me. :)
I guess I am missing the point here, if you change a relational database scheme, e.g. add columns, you introduce new data. It is off course impossible to generate new data by means of Torque or any tool. I guess you are referring to other changes. Could you give an example of such a change which could be supported by tools because I think I am missing the point. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
