private ConnectionDefinitionProperties mergedCdProps(ConnectionDefinitionProperties oldCdProps,
ConnectionDefinitionProperties newCdProps)
{
//TODO should merge more properties
PoolParams poolParams = newCdProps.getPoolParams() == null ?
oldCdProps.getPoolParams() : newCdProps.getPoolParams();
ConfigProperties props = newCdProps.getProperties() == null ?
oldCdProps.getProperties() : newCdProps.getProperties();
TransactionSupport trans = oldCdProps.getTransactionSupport();