/*
  * Default constructor Precondition: The Connection object in
  * MvbOracleConnection must be a valid database connection.
  */
 public PurchaseItemModel() {
   con = MvbOracleConnection.getInstance().getConnection();
 }
 /*
  * Default constructor Precondition: The Connection object in
  * MvbOracleConnection must be a valid database connection.
  */
 public ManagerTransactions() {
   con = MvbOracleConnection.getInstance().getConnection();
 }