With check-valid-connection-sql, you place a SQL statement in *-ds.xml and that statement
is run. If there is no error, it is assumed that the connection is valid.
With valid-connection-checker-class-name, you write a class that performs a connection
check. This class can do anything. For example, it might query certain tables to ensure
that the expected data exists, or perform a benign update to ensure that the account used
has update right (or doesn't have update rights!)
So the question is, would running a simple SQL statement be sufficient to verify the
connection, or do you need to do something more complex?
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