code: public void save(Object po) throws Exception {
  		String autoGeneratedColumnName = IdUtils.getAutoGeneratedId(po);
  		if(!"".equals(autoGeneratedColumnName)){
  			//有自增字段
  			int idValue = save(po, autoGeneratedColumnName);
  			//把自增的主键值再设置回去
  			IdUtils.setAutoIncreamentIdValue(po,autoGeneratedColumnName,idValue);
  		}else{
  			SqlParamsPairs sqlAndParams = ModelSqlUtils.getInsertFromObject(po);
  			
  			getProxy().update(sqlAndParams.getSql(), sqlAndParams.getParams());
  		}		
  	}
docs: 保存对象的快捷方法
  如果Id标定的是自增会将自增长的主键自动设置回对象
  save object
  @param po
  @throws Exception