mongoDB 简单使用

mongodb传送门：

# 第三方学习地址：
http://blog.csdn.net/foruok/article/details/47746057

# 下载mongoDB
https://www.mongodb.com/download-center

下载后默认是在：C:\Program Files\MongoDB\Server\3.2\bin

进入bin目录，使用以下命令开启数据库服务（需要先创建E:\MongoDB_Path）

$ ./mongod --dbpath "E:\MongoDB_Path"

此时界面会停在2015-03-26T15:19:17.135+0800 I NETWORK  [initandlisten] waiting for connections on port 27017 （此时数据库就已经启动） 

nodejs mongodb库传送门：

# nodejs mongodb库 github 与 官网
https://github.com/mongodb/node-mongodb-native
http://mongodb.github.io/node-mongodb-native/

# nodejs mongoose库 github
https://github.com/Automattic/mongoose
http://mongoosejs.com

安装mongoose : npm install mongodb

"use strict"
const mongo = require('mongodb');
const host = "localhost";
const port = ;

let server = new mongo.Server(host,port,{auto_reconnect:true});
let db = new mongo.Db('node-mongo-examples',server,{safe:true});

db.open(function(err,db){
    if(err) console.log("err");
    else {
        console.log("成功建立数据库链接");
        db.close();
    }

    db.on('close',function(err,db){
        if(err) console.log("关闭数据库失败");
        else  console.log("关闭数据库成功");
    })
})

数据插入

"use strict"
const mongo = require('mongodb');
const host = "localhost";
const port = 27017;

var db = new mongo.Db('node-mongo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,data){
    db.collection('users',function(err,collection){
        collection.insert({
            username:"李钊鸿",
            nickname:"贝尔塔猫"
        },function(err,docs){
            console.log(docs);
            db.close();
        })
    })
})

查询数据

let db = new mongo.Db('node-mongo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,db){
    db.collection('users',function(err,collection){
        if(err) throw err;
        else {
            collection.find({}).toArray(function(err, docs){
                console.log(docs);
                db.close();
            })
        }
    })
})

/* 指定查询的字段和值 */
{username:"李钊鸿"}

/* 指定查询的字段并限定字段值的范围 */
{username:{$in:['Lee','李钊鸿']}}

/* 指定查询字段，0为忽略，1为包含 默认_id是包含的 */
{username:"李钊鸿"},{fields:{username:1,_id:0}}

插入多个值，同时指定多个字段的查询条件

"use strict"
const mongo = require('mongodb');
const host = "localhost";
const port = 27017;

var docs = [
            {type:"food",price:11},
            {type:"food",price:10},
            {type:"food",price:9},
            {type:"food",price:8},
            {type:"book",price:7}
           ];

/* 多字段查询 */
let db = new mongo.Db('node-mongo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,db){
    db.collection('goods',function(err,collection){
        collection.insert(docs,function(err, docs){
            if(err) throw err;
            else {
                collection.find({type:"food",price:{$lt:10}}).toArray(function(err,docs){
                    if(err) throw err;
                    else {
                        console.log(docs);
                        db.close();
                    }
                })
            }
        })
    })
})

/* 或查询 */
let db = new mongo.Db('node-mongo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,db)
{
    db.collection('goods',function(err,collection){
        collection.find({$or:[{type:"food"},{price:{$lt:10}}]}).toArray(function(err,docs){
            if(err) throw err;
            else {
                console.log(docs);
                db.close();
            }
        })
    })
})

/* 且与或联合查询 */
db.open(function(err,db)
{
    db.collection('goods',function(err,collection){
        collection.find({type:"food",$or:[{price:11},{price:{$lt:9}}]}).toArray(function(err,docs){
            if(err) throw err;
            else {
                console.log(docs);
                db.close();
            }
        })
    })
})

在查询条件中指定一个数组的完整内容

"use strict"
const mongo = require('mongodb');
const host = "localhost";
const port = 27017;

let article1 = {name:"TV",tags:['device','electric equipment']};
let article2 = {name:"apple",tags:['fruit','food','citrus']};
let article3 = {name:"Node.js",tags:['language','web','computer']};
var docs = [article1,article2,article3];

var db = new mongo.Db('node-mogo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,data){
    db.collection('articles',function(err,collection){
        collection.insert(docs,function(err, docs){
            if(err) throw err;
            else {
                collection.find({tags:['fruit','food','citrus']}).toArray(function(err,docs){
                    if(err) throw err;
                    else {
                        console.log(docs);
                        db.close();
                    }
                })
            }
        })
    })
})

/* 除了可以指定数组完整内容外。还可以单独指定字段值数组中包含的某个元素 */
{'tags':'citrus'}

/* 使用数组中的序号来精确指定字段值数组（第一个元素的序号为0） */
{'tags.0':'fruit'}

指定某个子数据文档的某个元素的查询条件

"use strict"
const util = require('util');
const mongo = require('mongodb');
const host = "localhost";
const port = 27017;

let food1 = {type:"food",price:11};
let food2 = {type:"food",price:10};
let food3 = {type:"food",price:9};
let food4 = {type:"food",price:8};
let food = [food1,food2,food3,food4];
let store1 = {name:"store1",goods:food};

let book1 = {type:"book",price:11};
let book2 = {type:"book",price:10};
let book3 = {type:"book",price:9};
let book4 = {type:"book",price:8};
let book = [book1,book2,book3,book4];
let store2 = {name:"store2",goods:book};

var storesArray = [store1,store2];

var db = new mongo.Db('node-mogo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,data){
    db.collection('stores',function(err,collection){
        collection.insert(storesArray,function(err, docs){
            if(err) throw err;
            else {
                collection.find({'goods.type':"book"}).toArray(function(err,docs){
                    if(err) throw err;
                    else {
                        console.log(util.inspect(docs,{depth:3}));
                        db.close();
                    }
                })
            }
        })
    })
})

/*  小于$lt  */
{'goods.price':{$lt:10}}

/* 倒序排列，从大到小 */
/* {},{sort:{price:-1}} */

/* limit */
{},{limit:1}

/* explain 查看性能 */
{},{explain:true}

指定在查询时利用根据price 字段 创建的索引

"use strict"
const mongo = require('mongodb');
const host = "localhost";
const port = 27017;

let db = new mongo.Db('node-mongo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,db){
    db.collection('goods',function(err,collection){
       collection.createIndex({price:1},function(err, indexName){
            if(err) throw err;
            else {
                collection.find({type:'food'},{hint:{price:1}}).toArray(function(err,docs){
                    if(err) throw err;
                    else {
                        console.log(docs);
                        db.close();
                    }
                })
            }
        })
    })
})

查询一条数据findOne

"use strict"
const mongo = require('mongodb');
const host = "localhost";
const port = 27017;

let db = new mongo.Db('node-mongo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,db){
    db.collection('goods',function(err,collection){
       collection.findOne({},function(err , docs){
               console.log(docs);
               db.close();
       })
    })
})

Update 更新数据

"use strict"
const util = require('util');
const mongo = require('mongodb');
const host = "localhost";
const port = 27017;

let db = new mongo.Db('node-mongo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,db)
{
    db.collection('users',function(err,collection){
　　　　/* {}默认只更新第一条，可能是为了安全考虑考虑吧 */
        collection.update({},{username:"test",nickname:"test"},function(err,result){
              if(err) throw err;

　　　　　　　　　let n = JSON.parse(result).n;
　　　　　　　　　console.log(`更新了${n}条记录`);

              collection.find({}).toArray(function(err,docs){
                      console.log(docs);
              })
        })
    })
})

/* 指定更新条件 */
{username:"Lee"},{username:"李钊鸿",nickname:"test"}

删除数据

"use strict"
const util = require('util');
const mongo = require('mongodb');
const host = "localhost";
const port = 27017;

let db = new mongo.Db('node-mongo-examples',new mongo.Server(host,port,{auto_reconnect:true}),{safe:true});
db.open(function(err,db)
{
    db.collection('users',function(err,collection){
        collection.remove({username:"test"},function(err,result){
              if(err) throw err;
              let n = JSON.parse(result).n;
              console.log(`更新了${n}条记录`);
              collection.find({}).toArray(function(err,docs){
                      console.log(docs);
              })
        })
    })
})