Question

花了几个小时尝试在这里找到多种解决方案后，我决定在此处发布有关错误的问题（将其放在async.waterfall：function1中的第一个函数上）：

C:\wamp64\www\projet\app\node_modules\mysql\lib\protocol\Parser.js:80
    throw err; // Rethrow non-MySQL errors
    ^

TypeError: callback is not a function
at Query._callback (C:\wamp64\www\projet\app\model\mymodel.js:10:3)
at Query.Sequence.end (C:\wamp64\www\projet\app\node_modules\mysql\lib\protocol\sequences\Sequence.js:88:24)
at Query._handleFinalResultPacket (C:\wamp64\www\projet\app\node_modules\mysql\lib\protocol\sequences\Query.js:139:8)
at Query.EofPacket (C:\wamp64\www\projet\app\node_modules\mysql\lib\protocol\sequences\Query.js:123:8)
at Protocol._parsePacket (C:\wamp64\www\projet\app\node_modules\mysql\lib\protocol\Protocol.js:279:23)
at Parser.write (C:\wamp64\www\projet\app\node_modules\mysql\lib\protocol\Parser.js:76:12)
at Protocol.write (C:\wamp64\www\projet\app\node_modules\mysql\lib\protocol\Protocol.js:39:16)
at Socket.<anonymous> (C:\wamp64\www\projet\app\node_modules\mysql\lib\Connection.js:103:28)
at emitOne (events.js:116:13)
at Socket.emit (events.js:211:7)

我关注了几篇文章，但不确定语法或在此控制器和模型中构建代码的方式。我想我想念什么，但我不知道什么：（

这是myController.js

const async = require('async');
const MyModel = require('../model/mymodel');

module.exports.respond = function(socket) {
socket.on('connectionUser', function(param1, param2, param3= 'false') {
    try {
        async.waterfall([
            async.constant(param1, param2, param3),
            MyModel.function1,
            MyModel.function2,
        ], function3);
    } catch (err) {
        // ERRORS handler
    }

function funtion3 (err, userInfos, res[0]) {}

在mymodel.js中

const db = require('../config);

module.exports.function1 = function(callback){
    let reqSql = 'SELECT ...';
    db.query(reqSql, function(err, res){
        if (err) return callback(err);
        return callback(null, res[0]);
    });
};

module.exports.function2 = function(userInfos, callback){
    let reqSql = 'SELECT ....'
    db.query(reqSql, function(err, res){
        if (err) return callback(err);
        return callback(null, userInfos, res[0]);
    });
};

Answer 1

确切地显示错误消息。回调不是function1，function2，中嵌套函数中的函数

您需要从嵌套函数返回回调

尝试

const db = require('../config);

module.exports.function1 = function(callback){
    let reqSql = 'SELECT ...';
    db.query(reqSql, function(err, res){
        if (err) return callback(err);
        return callback(null, res[0]);
    });
};

module.exports.function2 = function(userInfos, callback){
    let reqSql = 'SELECT ....'
    db.query(reqSql, function(err, res){
        if (err) return callback(err);
        return callback(null, userInfos, res[0]);
    });
};

Async.waterfall：回调不是函数/模块。exports

1 个答案: