【MongoDB】The description of index(一)

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mongodb 中的Multikey Index Bounds解释$elemMatch

首先说一下 $elemMatch的用法: { _id: 1, results: [ 82, 85, 88 ] } { _id: 2, results: [ 75, 88, 89 ] } $elemMatch是匹配document 中数组中至少有一个元素满足$elemMatch中的所有条件,例如: db.scores.find( { results: { $elemMatch: { $gte: 80, $lt: 85 } } } ) 查询结果为: { "_id" : 1, "r…

【MongoDB】The description of index(一)

From this blog, we start to talk about the index in mongo Database, which is similar to the traditional database. Generally speaking, if the index need to be created in the traditional database, so does MongoDB. In MongoDB ,the field '_id ' has been…

【MonogDB】The description of index(二) Embedded and document Index

In this blog, we will talk about another the index which was called "The embedded ". First we init 1w the records as follows: watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc3hiMDg0MTkwMTExNg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve…

MongoDB - basic

mongoDB basic from:http://www.tutorialspoint.com/mongodb prject:https://github.com/chenxing12/l4mongodb overview getting-start collection dataType insert find Overview MongoDB is a cross-platform, document oriented database that provides, high perfor…

MongoDB 知识要点一览

1.启动mongoDb数据库: 进入mongoDB的安装目录,执行如下命令 C:\Program Files\MongoDB\Server\3.0\bin>mongod.exe --dbpath "C:\Program Files\MongoDB\Server\3.0\db" 启动成功后在打开一个cmd窗口,进入mongoDB的安装目录,执行mongo.exe,默认进入test库 2.use DATABASE_NAME 用于创建数据库.该命令如果数据库不存在,将创建一个新的数据库…

MongoDB.WebIDE：升级版的Mongodb管理工具

很早以前收藏了一片文章:<强大的MongoDB数据库管理工具>.最近刚好要做一些MongoDB方面的工作,于是翻出来温习了一下,用起来也确实挺方便.不过在使用过程中出现了一些个问题,加上更喜欢MongoUVE的操作习惯,于是决定“自己动手,丰衣足食”,写一个升级版的工具. 一.升级的基础内容原版是用的WebForm开发的,新版打算升级到MVC 前端框架使用bootstrap Mongodb的驱动程序改为使用官方版的驱动程序原版查询数据时使用的是解析sql语句的方式,新版打算采用javasc…

Mongodb 和普通数据库各种属性和语句的对应

SQL to MongoDB Mapping Chart In addition to the charts that follow, you might want to consider the Frequently Asked Questions section for a selection of common questions about MongoDB. Terminology and Concepts The following table presents the various…