`mongoose`

cnpm install -g mongoose

三方模块需要手动安装。

cnpm安装比较快，安装cnpm请移步。

`source.js`

const mongoose = require('mongoose');
const source_url = 'mongodb://localhost:27017/godme';
mongoose.connect(source_url);
mongoose.connection('connected', function(){
    console.log('connected success with source_url : ', source_url);
});
mongoose.connection('error', function(error){
    console.log('connect error : ', error);
});
mongoose.connection('disconnect', function(){
    console.log('disconnected !');
});
module.exports = mongoose;

mongoose：模块导入

source_url：连接地址

connect：发起连接

connection：监听事件

module.exports：模块导入

`person.js`

const mongoose = require('./source.js');
const Schema = mongoose.Schema;
var PeresonSchema = new Schema({
    name : {type : String},
    male : {type : String},
    age  : {type : Number}
});
module.exports = mongoose.model('Person', PersonSchema);

mongoose：同一个源

Schema：格式

PersonSchema：设置Person格式

model：生成模型

`save.js`

const Person = require('./person.js');
var person = new Person({
    name : 'godme',
    male : 'male',
    age  : 99
});
person.save(function(err, result){
    if(err){
        console.log('save error : ', err);
        return;
    }
    console.log('save success : ' , result);
})

Person：取出模型

person：通过模型直接new

save：对象直接保存，可设置回调方法

`update.js`

const Person = require('./person.js');
var where = {'name' : 'godme'}
var update = {'age' : '123'}
Person.update(where, update, function(error, result){
    if(error){
        console.log('update error : ', error);
        return;
    }
    console.log('update success : ', result);
});

Person：同源，静态调用即可

update：更新方法，先筛选，后更新，可回调

`ID.js`

const Person = require('./person.js');
var ID = '5bd95321242daf65e4347ea4';
var update = {'name' : 'judas'};
Person.findByIdAndUpdate(ID, update, function(error, result){
    if(error){
        console.log('update error : ', error);
        return;
    }
    console.log('update success : ', result);
});

findByIdAndUpdate：where换成ID

`delete.js`

const Person = require('./person.js');
var where = {'age' : 123};
Person.remove(where, function(err, result){
    if(err){
        console.log('remove error : ', error);
        return;
    }
    console.log('remove result : ', result);
});

remove：即delete

where：筛查条件

`search.js`

const Person = require('./person.js');
var where = {'name' : 'godme'};
Person.find(where, function(err, result){
    if(err){
        console.log('find error : ', error);
        return;
    }
    console.log('find result : ', result);
});

options

const Person = require('./person.js');
var where = {'name' : 'godme'};
var options = {'age':0,'_id':0,'_v':0 };
Person.find(where, function(err, result){
    if(err){
        console.log('find error : ', error);
        return;
    }
    console.log('find result : ', result);
});

options中要么全1要么全0，交杂会报错。

范围限定

{age: {$gte: 18, $lte: 30}}; // 18 <= age <= 30

var ID = '5bd95ae2272adb6bd01d91f9'
Person.findById(ID, function(err, result){
    if(err){
        console.log('find error : ', err);
        return;
    }
    console.log('find result : ', result);
});

count

Person.count({}, function(err, result){
    if(err){
        console.log('count error : ', err);
        return;
    }
    console.log('count : ', result);
})

正则模糊

Person.find({'name' : {$regex : /^g/}}, function(err, result){
    if(err){
        console.log('find error : ', err);
        return;
    }
    console.log('find result : ', result);
})

分页综合

const Person = require('./person.js');
var condition = {};
var show = {'_id':0,'__v':0,'male':0};
var pageSize = 5;
var order = {'age':1};
for(var currentPage = 0; currentPage < 5; currentPage++){
    var skipCount = currentPage * pageSize;
    Person.find(condition, show)
        .skip(skipCount)
        .limit(pageSize)
        .sort(order)
        .exec(function(err, resultList){
        if(err){
            console.log('page search Error : ', err);
            return;
        }
        console.log('page search size : ', resultList.length);
        resultList.forEach(function(result){
           console.log('- single : ', result); 
        });
    });
}

嗯，老操作，自我体会。

如果对mongo不太熟悉的，可以参阅一下这一篇，基本用法都有介绍。

`index.js`

const mongoose = require('./source.js');
const Schema = mongoose.Schema;
const PersonSchema = new Schema({
    name : {type : String, index : true},
    age  : {type : String},
    lastLogin : {type : Date , default : Date.now}
});
module.exports = mongoose.model('Person', PersonSchema);

index：指定为索引

default：设置默认值

node.js-mongoose