/** INTERNAL: Prepare the receiver for execution in a session. */
protected void prepare() throws QueryException {
if (getObject() != null) { // Prepare can be called without the object set yet.
checkDescriptor(getObject(), getSession());
setObject(getDescriptor().getObjectBuilder().unwrapObject(getObject(), getSession()));
}
super.prepare();
// It will only get to prepare if check database if required.
getQueryMechanism().prepareDoesExist(getDoesExistField());
}
