mongo DB的一般操作

最近接触了一些mongoDB 。将一些指令操作记录下来，便于查询和使用

登录

[root@logs ~]# mongo -u loguser -p log123456 –authenticationDatabase admin MongoDB shell version: 2.4.10 connecting to: test > show users > post = {“title”:”My Blog Post”,”Content”:”Here is my blog Post.”,”Date”:new Date()} { “title” : “My Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:12:03.061Z”) }

插入 –插入文档对象 > db.blog.insert(post) > post = {“title”:”Licz Blog Post”,”Content”:”Here is my blog Post.”,”Date”:new Date()} { “title” : “Licz Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:17:07.219Z”) } > db.blog.insert(post)

读取 –读取集合里一个文档 > db.blog.findOne() { “_id” : ObjectId(“54dac88dc956bbcbefa8151c”), “title” : “My Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:12:03.061Z”) }

–读取限定文档数 > db.blog.find().limit(100); > db.blog.find().limit(100); { “_id” : ObjectId(“54dac88dc956bbcbefa8151c”), “title” : “My Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:12:03.061Z”) } { “_id” : ObjectId(“54dac9b8c956bbcbefa8151d”), “title” : “Licz Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:17:07.219Z”) }

–读取所有文档数 > db.blog.find() { “_id” : ObjectId(“54dac88dc956bbcbefa8151c”), “title” : “My Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:12:03.061Z”) } > db.blog.find().limit(100); { “_id” : ObjectId(“54dac88dc956bbcbefa8151c”), “title” : “My Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:12:03.061Z”) } { “_id” : ObjectId(“54dac9b8c956bbcbefa8151d”), “title” : “Licz Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:17:07.219Z”) }

更新

–修改变量post,增加comments键 > post { “title” : “You Blog Post”, “Date” : ISODate(“2015-02-11T03:18:10.509Z”) } > post.comments=[] [ ] > db.blog.update({title:”You Blog Post”},post) > db.blog.find() { “_id” : ObjectId(“54dac88dc956bbcbefa8151c”), “title” : “My Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:12:03.061Z”) } { “_id” : ObjectId(“54dac9b8c956bbcbefa8151d”), “title” : “Licz Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:17:07.219Z”) } { “_id” : ObjectId(“54dac9f8c956bbcbefa8151e”), “title” : “You Blog Post”, “Date” : ISODate(“2015-02-11T03:18:10.509Z”), “comments” : [ ] }

删除

–删除title限定条件的文档 > db.blog.remove({title:”You Blog Post”}) > db.blog.find() { “_id” : ObjectId(“54dac88dc956bbcbefa8151c”), “title” : “My Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:12:03.061Z”) } { “_id” : ObjectId(“54dac9b8c956bbcbefa8151d”), “title” : “Licz Blog Post”, “Content” : “Here is my blog Post.”, “Date” : ISODate(“2015-02-11T03:17:07.219Z”) } >

MongoDB使用技巧

–help帮助命令 > help db.help() help on db methods db.mycoll.help() help on collection methods sh.help() sharding helpers rs.help() replica set helpers help admin administrative help help connect connecting to a db help help keys key shortcuts help misc misc things to know help mr mapreduce

show dbs show database names show collections show collections in current database show users show users in current database show profile show most recent system.profile entries with time >= 1ms show logs show the accessible logger names show log [name] prints out the last segment of log in memory, ‘global’ is default use <db_name> set current database db.foo.find() list objects in collection foo db.foo.find( { a : 1 } ) list objects in foo where a == 1 it result of the last line evaluated; use to further iterate DBQuery.shellBatchSize = x set default number of items to display on shell exit quit the mongo shell

–特殊集合名处理 如果集合名恰好是和数据库类的一个属性名相同，可以使用db.getCollection进行访问

> db.version function (){ return this.serverBuildInfo().version; } > db.getCollection(“version”) test.version

发布者：全栈程序员栈长，转载请注明出处：https://javaforall.cn/119710.html原文链接：https://javaforall.cn