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MongoDB的使用

Jun 07, 2016 pm 03:57 PM
mongodb use project

最近项目用到了mongoDB,最近类mongoDB的Nosql数据库也比较火爆,把这个写下来,便于自己回顾和大家学习. 在mongoDB中数据的关系是database,collection,document 放到关系型数据库里面就是库,表,数据. 1.在ubuntu下执行 sudo apt-get install mongo 安装mongo.

最近项目用到了mongoDB,最近类似mongoDB的Nosql数据库也比较火爆,把这个写下来,便于自己回顾和大家学习.

在mongoDB中数据的关系是database,collection,document 放到关系型数据库里面就是库,表,数据.

1.在ubuntu下执行 sudo apt-get install mongo 安装mongo.

2.输入mongo进入数据库.

查看集合(表) show collections;

查看student集合的数据

db.student.find();

db.student.find().forEach(printjson);

查看第三条到第六条记录

db.student.find().skip(2).limit(3);

db.student.find().forEach(printjson); ---以json格式查看记录

向student集合中插入数据

db.student.insert({name:"Jack",age:22,score:86});

删除某条数据

db.student.remove({name:"Jack"});

修改数据

db.student.update({name:"Tom"},{$set:{name:"Lubby"}});

条件查询:

db.student.find({score:{$gt:86}}); score>86

db.student.find({score:{$gte:86}}); score>=86

db.student.find({score:{$lt:100}}); score

db.student.find({score:{$lte:100}}); score

db.student.find({score:{$gt:87,$lt:100}}); 87

db.student.find({name:{$ne:"Lubby"}}); name != Lubby

显示某个字段存在的数据

db.student.find({name:{$exists:true}});

查询不匹配 name=B*带头的记录
db.users.find({name: {$not: /^B.*/}});

正则表达式匹配

排序

db.student.find().sort({score:1}); 按照score升序排序

db.student.find().sort({score:-1}); 按照score降序排序

还有一些类似分组查询的回头有时间再补上.

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