Andrus Adamchik created CAY-2740:
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Summary: Mapping Proposal: DbAttribute should have its own Java
type
Key: CAY-2740
URL: https://issues.apache.org/jira/browse/CAY-2740
Project: Cayenne
Issue Type: Improvement
Reporter: Andrus Adamchik
Let's make "javaType" a property of DbAttribute. By default it will be
auto-generated from JDBC type. And we can allow to optionally override it at
the ObjAttribute level (with an explicit conversion when creating objects from
DataRows).
h2. Problems it Solves
* Non-standard type mapping (the whole OTHER type implies we provide some Java
class for it). This provides runtime consistency and eliminates the internal
hacks such as when Cayenne would try to guess which ObjEntities might use this
DataRow, and populate DataRows with values corresponding to the ObjAttribute
type definitions. This clearly breaks layer separation and doesn't always work.
* Unexpected PK types. PK columns are often not mapped as ObjAttributes, so
their type is guessed by Cayenne, and if the type is something vague such as
NUMBER, you may get BigDecimals, and other inappropriate types, and you can no
longer reliably compare objects.
h2. Prior discussions:
* http://markmail.org/message/6bs2suislyfp3apk
* http://markmail.org/message/icr7seqazgsdtewc
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