查找mongod是否可用
which mongod启动mongodb 指定path 和log日志
mongod --dbpath /data2/db --port=27017 --fork /data2/db/log/mongod.log关闭数据库
mongod --shutdown
连接服务器
mongod 115.29.137.34:27017使用数据库(不存在的数据库也可以使用,插入数据之后会自动保存)
use mydb权限登陆
db.auth('username','password')展示数据库列表
show dbs插入数据(类似于mysql的表)
db.users.insert({'name':'xiaomo'})db.users.insert({'name':'xiaoming','age':25})db.users.insert({'name':'xiaoming','age':24,'sex':'女'})查询集合(前提是use了一个数据库)
show collections有一个System.indexes 是索引不带条件查询
db.users.find()带条件查询(参数是一个对象)
db.users.find({'name':'xiaomo'})更新数据(有三个参数,1:查询条件,2:更新的内容 3：更新的配置)
db.users.update({'name':'xiaomo',{$set:{'name:'xm}})//修改满足条件的第一条数据db.users.update({'name':'xiaomo',{$set:{'name:'xm}},{multi:true})//修改所有满足条件的数据保存数据(只有一个参数，必须要传id，后面是要修改的数据)
db.users.save({'id':'objectId(574710a97a3afd63cde56a49)','age':30})删除数据(1:条件 2 是否删除所有符合条件的)
db.users.remove({'name':'xiaomoing'},true)删除集合
db.users.drop()
##三、使用mongoose操作数据库##
模块的介绍
连接mongdodb的驱动配置和链接
cnpm install --save mongoose
var mongoose = require('mongoose');
//var uri = 'mongodb://username:password@hostname:port/databasename';
var uri = 'mongodb://xiaomo:xiaomo@115.29.137.34:27017/admin';
mongoose.connect(uri);
- Model 和Shema
// model.js
var Schema = mongoose.Schema,
ObjectId = Schema.ObjectId;
var BlogPost = new Schema({
author : ObjectId,
title : String,
body : String,
date : Date
});
//Model
mongoose.model('blog',Schema);
var Comment = new Schema({
name: { type: String, default: 'hahaha' },
age: { type: Number, min: 18, index: true },
bio: { type: String, match: /[a-z]/ },
date: { type: Date, default: Date.now }
});
// a setter
Comment.path('name').set(function (v) {
return capitalize(v);
});
// middleware
Comment.pre('save', function (next) {
notify(this.get('email'));
next();
});
- 创建文档
//insert.js
var mongoose ＝ require('mongoose');
require('./model.js'); //执行
var Blog = mongoose.model('blog');
var blog = new Blog({
name:'xiaomo',
age:25,
bio:'don't know',
date:new Date
});
book.save(function(err){
console.log('save status:'+err);
});
- 删除文档
var mongoose = require('mongoose');
require('./model.js');
var Blog = mongoose.model('blog');
Blog.findOne({'name':'xiaomo'},function(err,doc){
if(err){
console.log(err)
return;
}
if(doc){
doc.reomove();
}
})
- 简单查询
var mongoose = require('mongoose');
require('./model.js');
var Blog = mongoose.model('blog');
Blog.find({},function(err,doc){
if(err){
console.log(err)
return;
}
console.log('result',doc)
})
第一个满足条件的结果
var mongoose = require('mongoose');
require('./model.js');
var Blog = mongoose.model('blog');
Blog.findOne({'name':'xiaomo'},function(err,doc){
if(err){
console.log(err)
return;
}
console.log('result',doc)
})
- 条件语句
//condation.js
var mongoose = require('mongoose');
require('./model.js');
var Blog = mongoose.model('blog');
//名字是xiaomo或者xiaoming 可以用$or和$and
var condation = {
$or $and:[
{'name':'xiaomo'},
{'name':'xiaoming'}
]
}
Blog.find(condation,function(err,doc){
if(err){
console.log(err)
return;
}
console.log('result',doc)
})
##三、在项目中使用mongoose##
生成项目
koa koatest -e koatest安装依赖
cd koatest && cnpm install安装mongoose
cnpm install --save mongoose创建模型
//models/users.server.model.js
var mongoose = require('mongoose');
var UserSchema = new mongoose.Schema({
uid:Number,
username:String,
createTime:Date,
lastLogin:Date
})
module.exports = mongoose.model('User',UserSchema);
- 创建配置文件
//config/config.js
module.exports={
mongodb:'mongodb://xiaomo:xiaomo@115.29.137.34:27017/admin'
}
//config/mongoose.js
var mongoose = require('mongoose');
var config = require('./config.js');
module.exports=function(){
var db = mongoose.connect(config.mongodb);
require('./../models/users.server.model.js');
return db;
}
- 操作mongdodb
//routers/users.js