有没有一种方法可以结合两个查询的结果，然后再发送回用户（使用node和express）？

Question

莱姆解释：

问题：

我需要返回一个带有如下对象的数组：

[
   {
      region: region, 
      towns: [multiple towns]
   }, 
   {
      region: region, 
      towns: [multiple towns]
   }, 
   {
      region: region, 
      towns: [multiple towns]
   }
]

此刻，正在返回一个空数组[]。

这是我的代码：

serve.get('/info', cors(corsOptions), (req,res)=>{
    let result=[]; //create array to store data
    dbConn.query(
        `SELECT DISTINCT region FROM address region`, //first query
        (error, rows)=>{
            if(!error){// BEGIN IF FOR FIRST QUERY
                // WHEN THERE IS NO ERROR
                for(let i=0; i<rows.length; i++){// iterate trough result and get all towns in that region
                    let region= rows[i].region;
                    dbConn.query(
                        'SELECT DISTINCT town FROM address WHERE region=? ORDER BY town',// SECOND QUERY
                        [region],// GET TOWNS OF CURRENT REGION
                        (error, rows)=>{
                            if(!error){// IF FOR SECOND QUERY
                                //when there is no error
                                result.push({divnum: division, blocks: rows})// push details into array in desired format
                            }else{// END IF
                                //when there is an error
                                saveError(error);// FUNCTION TO LOG ERROR
                                res.send(error);
                            }// END ELSE
                        }// END CALLBACK
                    );
                }// END FOR-LOOP
                res.send(result);// Send result
            }else{// END IF FOR FIRST QUERY
// WHEN THERE IS AN ERROR
saveError(error);
                res.send(error);
            }
        }
    )
});//END SERVE

我确实意识到将返回一个空数组，因为程序在执行任何操作之前并未完全等待查询的任何结果。

为了获得所需的结果，我需要修改什么？

即：

[
   {
      region: region, 
      towns: [multiple towns]
   }, 
   {
      region: region, 
      towns: [multiple towns]
   }, 
   {
      region: region, 
      towns: [multiple towns]
   }
]