Clean up code relating to Object handling in DataValueDescriptor.
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Key: DERBY-776
URL: http://issues.apache.org/jira/browse/DERBY-776
Project: Derby
Type: Sub-task
Components: SQL
Reporter: 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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