Mongo DB Study: first face with mongo DB

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Mongo DB Study: first face with mongo DB

Mongo DB Study: first face with mongo DB 1. study methods: 1. Translate: I am the mongo DB organization website truck man. And I may use my knowledge to help myself learn more. 2. Practice: only the practice can make me what I have done and what I…

MongoDB - The mongo Shell, Write Scripts for the mongo Shell

You can write scripts for the mongo shell in JavaScript that manipulate data in MongoDB or perform administrative operation. For more information about the mongo shell, see the Running .js files via a mongo shell Instance on the Server section for mo…

mongo实践-透过js shell操作mongo

mongo实践-通过js shell操作mongo 保存命令: j={name:"wangjingjing",age:15} db.user.save(j); 查询命令: var cursor = db.user.find(); while(cursor.hasNext())printJson(cursor.next()); printJson(cursor[4]); var arr = cursor.toArray(); db.user.find({name:"wangji…

rake db:migrate 与 bundle exec rake db:migrate 的区别(copy)

[说明:资料来自http://blog.csdn.net/lihuan974683978/article/details/8715414] 之前一直没弄明白rake db:migrate 与 bundle exec rake db:migrate有区别,用的过程中也没出意外.最近无意中弄明白了现在也说下吧: rake db:migrate 其实 rake 本身是就是一个gem; 所以你可能有多个项目,用到了相同的gem,但版本不同.哪怎么确定每个项目使用的是哪个版本呢? 哪就要用到 bundl…

Redis 配置连接池，redisTemplate 操作多个db数据库，切换多个db，解决JedisConnectionFactory的设置连接方法过时问题。（转）

环境 springmvc jdk1.8 maven redis.properties配置文件 #redis setting redis.host=localhost redis.port=6379 redis.password= redis.maxIdle=200 redis.minIdle=0 redis.maxActive=50 redis.maxWait=10000 redis.testOnBorrow=true redis.timeout=100000 #定义需要使用的db //#ses…

mongo源码学习（二）db.cpp之mongoDbMain方法分析

mongo后台进程的入口:mongo/src/mongo/db/dbmain.cpp,wmain(for windows)和main函数,main函数也很简单,就是委托给db.cpp中的mongoDbMain函数来处理. 下面的这段代码就是db.cpp:mongoDbMain的执行过程: int mongoDbMain(int argc, char* argv[], char** envp) { // 注册进程关闭时候执行的任务 registerShutdownTask(shutdownTask…

MongoDB - The mongo Shell, Data Types in the mongo Shell

MongoDB BSON provides support for additional data types than JSON. Drivers provide native support for these data types in host languages and the mongo shell also provides several helper classes to support the use of these data types in the mongo Java…