public boolean update(List<T> datas) {
Iterator<?> iter = datas.iterator();
Connection connection = null;
TableDescriptor table = dbEngine.getTableDescriptor(entity);
Field[] fs = entity.getDeclaredFields();
if (fs.length != table.columns.length) {
// logger.log(Level.WARNING,
// "The object's fields can not match the table's columns!");
logWarning(" 插入的数据项与表中的项不匹配");