Ability to "integrate" data from multiple data sources at the DAO layer
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Key: IBATIS-100
URL: http://issues.apache.org/jira/browse/IBATIS-100
Project: iBatis for Java
Type: New Feature
Components: DAO
Environment: All
Reporter: Greg Akins
Priority: Minor
I'm reading data from 3 different databases.
Most of the time, I read from a single database, and write to another... So
nothing is "complicated" in Ibatis.
However, sometimes I have to read from database "A" while getting lookup data
from database "B"
Initially, I wrote a translation method that would get an object with ID's..
Lookup each ID in database "B" and copy the data with Object references instead
of ID fields to my application
Now, thanks to Nathan, I am using a CustomTypeHandler to get "lookup" values
where I didn't feel like putting the data in the database at all (using
type-safe enumerators).
It seems like maybe CustomerTypeHandlers would have been appropriate for
integrating multiple datasource, much like integrating datasources with
enumerators; Does that seem like a bad idea? Something smells funny about
creating dependencies between the persistence and DAO's in this manner?
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