[ http://issues.apache.org/jira/browse/DERBY-776?page=all ]
Daniel John Debrunner reassigned DERBY-776:
-------------------------------------------
Assign To: Daniel John Debrunner
> Clean up code relating to Object handling in DataValueDescriptor.
> -----------------------------------------------------------------
>
> Key: DERBY-776
> URL: http://issues.apache.org/jira/browse/DERBY-776
> Project: Derby
> Type: Sub-task
> Components: SQL
> Reporter: Daniel John Debrunner
> Assignee: Daniel John Debrunner
> Priority: Minor
>
> In looking at DERBY-438 the error:
> ERROR XCL12: An attempt was made to put a data value of type
> 'org.apache.derby.impl.jdbc.EmbedBlob' into a data value of type 'BLOB'.
> I think is somewhat due to some confusion in the methods that set the value
> of a DataValueDescriptor from an object with signature java.lang.Object,
> e..g. through DVD.setValue(Object) or PreparedStatement.setObject().
> PS.setObject does not use the setValue(Object) method, but instead, based
> upon the object's class, calls one of the PS.setXXX methods, e.g. setLong()
> for a java.lang.Long object. This ensures consistent setting of the value,
> some of the setValue(Object) methods' behaviour does not match what would
> happen if the same object was passed into a setValue() method with the
> correct signature.
> I think this confusion is historic wrt Cloudscape's support of Java types in
> SQL. This taks will clean up some of this code and ensure the roles of the
> set methods are clear wrt Object. (e.g. DVD.setValue(Object),
> DVD.setObjectForCast).
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