在数据库中每天保留表的副本

Question

我希望每天12点将所有数据从原始表复制到重复表。如果我这样做，无论发生什么变化都应该反映在重复的表中...就像我们添加应添加到重复表的新行一样。更重要的是，如果我们更改原始表中的任何列，也应该反映在重复表中而不添加新行现有的行属性值应该更改。

@Override
public void insertDataToTableAtBegining() {

    Query itemQuery1 = entitymanager.createNativeQuery("INSERT graph_item SELECT * FROM item WHERE order_id IS NOT NULL");

    log.info("Inserting is completed where count is ZERO for item");

    itemQuery1.executeUpdate();

    Query orderQuery1 = entitymanager.createNativeQuery("INSERT graph_mrk_order SELECT * FROM mrk_order");

    log.info("Inserting is completed where count is ZERO for order");

    orderQuery1.executeUpdate();

}
@Override
public void insertDataToTable(Date beg, Date end) {

    Query itemQuery1;

    itemQuery1 = entitymanager.createNativeQuery("INSERT graph_item SELECT * FROM item WHERE create_timestamp BETWEEN '" + beg +"' AND '"+ end +"' WHERE order_id IS NOT NULL");
    log.info("Inserting is completed in Daily for item");

    itemQuery1.executeUpdate();


    Query orderQuery1;



    orderQuery1 = entitymanager.createNativeQuery("INSERT graph_mrk_order SELECT * FROM mrk_order WHERE create_timestamp BETWEEN '" + beg +"' AND '"+ end +"'");
    log.info("Inserting is completed in Daily for order");

    orderQuery1.executeUpdate();
}