我使用node.js在mysql中插入大量数据时遇到了一个错误这里是数据

instData = [ [ '73caf3d0-f6a4-11e8-8160-eb5f91ce3830',
               '20181017'],
             [ '73caf3d1-f6a4-11e8-8160-eb5f91ce3830',
               '20181019'],
            ... 49316 more items ]

以下是部分连接代码：

let pool = mysql.createPool(db);

 module.exports = {
   connPool (sql, val, cb) {  //function name
       pool.getConnection((err, conn) => {
         if(err){
           console.log('Connection Error:' + err);
         }else{
           console.log('allConnections:' + pool._allConnections.length);
           let q = conn.query(sql, val, (err, rows,fields) => {
              if (err) {
                console.log('Query:' + sql + ' error:' + err);
              }
              cb(err, rows, fields);
              conn.release();
            });
         } // end if
      }); // end pool.getConnection
   }, 
  ......

当我运行insert代码时，我得到了一个错误。

sql_inst ='insert into demo (id,upload_time) values ?';
 func.connPool(sql_inst, [instData], (err,rows,fields) => {
    if(err==null){
        res.json({code: 200, msg: 'success', data: req.body });
    } else {
        res.json({code: 400, msg: 'failed:'+err});
    }
 });

错误信息：

{ Error: read ECONNRESET
at TCP.onStreamRead (internal/stream_base_commons.js:111:27)
--------------------
at Protocol._enqueue (D:\Projects\test\node_modules\mysql\lib\protocol\Protocol.js:144:48)
at PoolConnection.query (D:\Projects\test\node_modules\mysql\lib\Connection.js:200:25)
at pool.getConnection (D:\Projects\test\sql\func.js:29:26)
at Ping.onOperationComplete (D:\Projects\test\node_modules\mysql\lib\Pool.js:110:5)
at Ping.<anonymous> (D:\Projects\test\node_modules\mysql\lib\Connection.js:502:10)
at Ping._callback (D:\Projects\test\node_modules\mysql\lib\Connection.js:468:16)
at Ping.Sequence.end (D:\Projects\test\node_modules\mysql\lib\protocol\sequences\Sequence.js:83:24)
at Ping.Sequence.OkPacket (D:\Projects\test\node_modules\mysql\lib\protocol\sequences\Sequence.js:92:8)
at Protocol._parsePacket (D:\Projects\vutest\node_modules\mysql\lib\protocol\Protocol.js:278:23)
at Parser.write (D:\Projects\test\node_modules\mysql\lib\protocol\Parser.js:76:12)
errno: 'ECONNRESET',
code: 'ECONNRESET',
syscall: 'read',
fatal: true }

似乎连接已关闭，但问题是我使用连接池，它不应该每次都连接。
当我缩小数据的大小，例如数据包含100条记录时，代码运行成功。
运行env:node:v10.11.0mysql:v5.7
我对这个问题有多冷淡？太棒了！