nodejs mongoose 数据库处理

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本文介绍了一个使用Node.js和Mongoose进行MongoDB数据库操作的例子，具体展示了如何连接数据库、定义Schema以及执行数据查询任务。

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/**
 * author:zhengjinwei
 * time: 2016/04/25
 **/
var Mongoose = require('mongoose');
var Schema = Mongoose.Schema;
var Async = async = require('async');
var _ = require("lodash");


var dbUrl = "mongodb://127.0.0.1:27017/myDB";
var startDay = new Date("2016-4-20 0:0:0");
var endDay = new Date("2016-4-21 0:0:0");
var levelId = "level_1";
var count = 1000;


var AdventureTable = {
    userid: {type: String, default: ""},
    score: {type: Number, default: 0},
    log_time: {type: Number, default: Date.now},
};

var SchemaOption = {};

var AdventureSchema = new Mongoose.Schema(AdventureTable, SchemaOption);

function connectDB(cb) {
    var conn = Mongoose.createConnection(dbUrl);
    conn.on('error', function (error) {
        console.log(error);
        cb(error);
    });

    conn.once('connected', function () {
        console.log("connected success");
        cb(null, conn);
    });

    conn.on('disconnected', function () {
        console.log("disconnected");
    })
}


AdventureSchema.statics.getData = function (beginDay, endDay, levelId, count, cb) {
    var model = this;
    var condition = {
        log_time: {
            $gte: beginDay.getTime(),
            $lt: endDay.getTime()
        },
        level: levelId
    };

    var view = {
        score: 1,
        _id: 0
    };


    model.find(condition, view).sort({score: 1}).limit(count).lean().exec(function (err, docs) {
        cb(err, docs);
    });
};


function process() {
    connectDB(function (err, conn) {
        if (!err) {
            var model = conn.model("adventure", AdventureSchema);

            model.getData(startDay, endDay, levelId, count, function (err, docs) {
                if (!err && docs.length) {
                    console.log("###:", docs.length);
                }
            });
        }
    })
}

process();