java 动态生成SQL的实例讲解

 public <T> String updateSqlAndParamList(Vector<String> ve,List<String> paramList,T t,String table,List<String> list){  String strSql="";//MQ消息SQl  String upSql="";//可执行SQL  try {   //组装SQL语句   strSql = "update "+table+" set ";   upSql="update "+table+" set ";   for(int i = 0; i < ve.size(); i++){    String str = "";    String upStr="";    String key = ve.get(i);    String fileName="get"+key.toUpperCase();    String value=(String)t.getClass().getMethod(fileName).invoke(t);    paramList.add(i,value);    if(i == ve.size()-1){     str = key+" = ?";     upStr=key+"='"+value+"'";    }else{     str = key+" = ? ,";     upStr=key+"='"+value+"',";    }    strSql+=str;    upSql += upStr;   }   strSql +=" where Id = ? ";   upSql+=" where id='"+(String) t.getClass().getMethod("getID").invoke(t)+"'";   list.add(upSql);   paramList.add(ve.size(),(String) t.getClass().getMethod("getID").invoke(t));  } catch (Exception e) {   logger.info("组装UPDATE SQL失败！失败详情---"+e);  }  return strSql; }