Question

如何将聚合查询与facet一起用于node.js服务器端数据表。

这是我的导出路由，用于将数据发送到node.js服务器端数据表

代码可以正常工作，但是实际代码不利于生产，因为查询数据库3次只是为了生成一个表，一次查询总数，一次查询过滤后的数据，一次查询实际数据。更好的方法是使用带有$ facet的聚合管道只查询一次数据库，然后分离结果，但是我不知道，请问是否有人使用过$ facet查询并得出结果解决方案。张贴在这里供大家理解。

exports.postDashboardCDR = (req, res, next) => {
    var searchStr = req.body.search.value;
    if (req.body.search.value) {
        var regex = new RegExp(req.body.search.value, "i")
        searchStr = { $or: [{ 'src': regex }, { 'start': regex }, { 'answer': regex }, { 'end': regex }, { 'sequence': regex }] };
    } else {
        searchStr = {};
    }

    var recordsTotal = 0;
    var recordsFiltered = 0;

    CdrModel.estimatedDocumentCount({}, function(err, c) {
        recordsTotal = c;
        console.log(c);
        CdrModel.countDocuments(searchStr, function(err, c) {
            recordsFiltered = c;
            console.log(c);
            console.log(req.body.start);
            console.log(req.body.length);
            CdrModel.find(searchStr, '_id src start answer end sequence', { 'skip': Number(req.body.start), 'limit': Number(req.body.length) }, function(err, results) {
                if (err) {
                    console.log('error while getting results' + err);
                    return;
                    //return next(new Error('No order found. ' + err));
                }

                var data = JSON.stringify({
                    "draw": req.body.draw,
                    "recordsFiltered": recordsFiltered,
                    "recordsTotal": recordsTotal,
                    "data": results
                });
                res.send(data);
                //console.log(data);
            });

        });
    });
};

**Mongoose cdr.js**

const mongoose = require('mongoose');

const Schema = mongoose.Schema;

const cdrDTOptions = {
    timestamps: true,
    toJSON: {
        virtuals: true
    },
    toObject: {
        virtuals: true
    }
};

const cdrDTSchema = new Schema({
    _id: String,
    src: String,
    start: String,
    answer: String,
    end: String,
    sequence: String
}, cdrDTOptions);

module.exports = mongoose.model('Cdrs', cdrDTSchema);

如何将聚合查询与facet一起用于node.js服务器端数据表，Mongo聚合查询于facet，聚合与facet

0 个答案: