To add to what Mike wrote, JdbcAdapter (superclass of all standard
DbAdapters) has a method "setPkGenerator", so you can provide a custom
PkGenerator for any existing adapter.
Andrus
> Albert Jagnow <albert-jagno..iowa.edu> wrote:
>> I am working on a web version of an application that uses the same data
>> as a legacy RPG application. The PK values for the tables come from a
>> table with columns for table name and last used PK value. The legacy
>> RPG application is adding records at the same time I am adding records
>> from the web application. In my testing I have run into some problems
>> with conflicting PK values. I was using DataObjectUtils.objectForPK
>> passing in the table name to obtain the next PK value for the table, but
>> this appears to not always grab the most current data from the table.
>> What is the best method to quickly get and update the next PK value?
>> Also does cayenne have the ability to use a PK delegate like in
>> WebObjects, that will call my custom PK generation method for a given
>> entity automatically when the data is to be written to the database?
>
> If you take a look at DbAdaptor, you can create a subclass of your adaptor
> and provide an alternate generator.
> It's pretty simple to do. The standard auto pk generation is very
> similar
> to both webobjects and to the RPG code you've describe, so it'd probably
> just be a matter of providing a different table and column nameset.
>
> -Mike
>
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