pool.getConnection(function(err,conn){
  if(!err){
    
    conn.beginTransaction(function(err){
      
      var billdata = {
        webi_guid:db.newGuid(),
        weor_code:'test111',
        webi_paywecode:'1111',
        webi_totalfee:100
      };
      
      conn.query('insert into we_bill set ?',billdata,function(err,rows){
        
        console.log('sss'+err);  
        conn.rollback(function(err){console.log(err)});
        //conn.commit();
        conn.release();
        return;
      
      });  
    });  
  }
  else{
    console.log('err'); 
  };
});