Node Js循环查询-同步和变量更新问题

Question

I want to do the following

select information from mysql where start ~start+30

Information have date info Then from the information i want to update start to start + 30.

I have problem. The problem is when I execute query func in loop it didn't work sync.

This is my code.

var jdate = new Array(); //string data compare for date mysql -> javascript
for (var i = 0; i < 2; i++) {
  jdate[i] = new Date();
}
var date = new Array(); //string data use in sql pure  mysql data
var sql = "SELECT jobEndDt,jobData FROM Table WHERE jobEndDt is not null AND jobEndDt BETWEEN \"2016-06-2 00:00:00\" AND date_add(\"2016-06-2 00:00:00\",interval 30 day) ORDER BY jobEndDt";

for (; jdate[0].getDate() + 30 <= jdate[1];) {

  connection.query(sql, function(err, rows, fields) {
    date[0] = rows[0].jobEndDt;
    date[1] = rows[rows.length - 1].jobEndDt;

    if (err) throw err;
    console.log("Before__Date : " + date[0] + " " + date[1]); //!!
    console.log("Before__sql : " + sql); //update ok..
    console.log('get data from server ' + rows.length);

    for (var i = 0; i < rows.length; i++) {
      var nd = new Mysql();
      nd.jobData = rows[i].jobData;
      nd.save();
    }
    console.log("save seq end " + rows.length);
    jdate[0] = new Date(date[0]);
    jdate[1] = new Date(date[1]);
    date[1] = dtosql(date[1]); // convert mysqldate to yyyy-mm-dd
    sql = "SELECT jobEndDt,jobData FROM Table WHERE jobEndDt is not null AND jobEndDt BETWEEN " + date[1] + " AND date_add(" + date[1] + ",interval 30 day) ORDER BY jobEndDt";
    console.log("After__sql : " + sql);

  });

}

And this is result

Before__Date : Thu Jun 02 2016 10:42:46 GMT-0400 (EDT) Wed Jun 29 2016 19:05:21 GMT-0400 (EDT) Before__sql : SELECT jobEndDt, jobData FROM Table WHERE jobEndDt is not null AND jobEndDt BETWEEN "2016-06-2 00:00:00" AND date_add("2016-06-2 00:00:00",interval 30 day) ORDER BY jobEndDt get data from server 189

save seq end 189 After__sql : SELECT jobEndDt, jobData FROM Table WHERE jobEndDt is not null AND jobEndDt BETWEEN "2016-06-29 19:05:21" AND date_add("2016-06-29 19:05:21",interval 30 day) ORDER BY jobEndDt

Before__Date : Thu Jun 02 2016 10:42:46 GMT-0400 (EDT) Wed Jun 29 2016 19:05:21 GMT-0400 (EDT) Before__sql : SELECT jobEndDt, jobData FROM Table WHERE jobEndDt is not null AND jobEndDt BETWEEN "2016-06-29 19:05:21" AND date_add("2016-06-29 19:05:21",interval 30 day) ORDER BY jobEndDt get data from server 189

save seq end 189 After__sql : SELECT jobEndDt, jobData FROM Table WHERE jobEndDt is not null AND jobEndDt BETWEEN "2016-06-29 19:05:21" AND date_add("2016-06-29 19:05:21",interval 30 day) ORDER BY jobEndDt

Before__Date : Thu Jun 02 2016 10:42:46 GMT-0400 (EDT) Wed Jun 29 2016 19:05:21 GMT-0400 (EDT) Before__sql :SELECT jobEndDt, jobData FROM Table WHERE jobEndDt is not null AND jobEndDt BETWEEN "2016-06-29 19:05:21" AND date_add("2016-06-29 19:05:21",interval 30 day) ORDER BY jobEndDt get data from server 189

save seq end 189 After__sql : SELECT jobEndDt, jobData FROM Table WHERE jobEndDt is not null AND jobEndDt BETWEEN "2016-06-29 19:05:21" AND date_add("2016-06-29 19:05:21",interval 30 day) ORDER BY jobEndDt

program continue this result.