mysql - 如何在http服务器开始接受请求之前建立mysql2连接？

Question

const http = require('http');
var mysql2 = require('mysql2/promise');
var mysql2Conn;

const httpServer = http.createServer(function(req,res){
    // error handler
    // handlers
    // req.on('data' ...
    // req.on('end' ...

}).listen(config_private.localPort, async function (err){
    // error handler
};

上面的代码应该放在哪里

mysql2Conn= await mysql2.createConnection({..params..});

让服务器.listen并让http.createServer的eventHandler在sqlConn1准备好后接受http请求？

Answer 1

连接到db后，您可以监听，例如:

const http = require('http');
var mysql2 = require('mysql2/promise');
var mysql2Conn;

const httpServer = http.createServer(function(req,res){
  // error handler
  // handlers
  // req.on('data' ...
  // req.on('end' ...
});

async function init() {
  try {
    mysql2Conn= await mysql2.createConnection({..params..});
    httpServer.listen(config_private.localPort, async function (err){
      // error handler
    });
  } catch(e) {
    console.log('db connection failed');
  }
}

init();