mongodb 入门

mongodb 基本命令

show dbs or db

当前数据库

use dbs

切换指定数据库,若进行过操纵则自动创建该数据库

show collections

当前数据库的所有集合

db.stats()

当前数据库的统计信息

db.getCollectionNames()

当前数据库的集合名称列表

db.getCollection(       
db.getLogComponents(    
db.getQueryOptions(     
db.getSlaveOk(
db.getCollectionInfos(  
db.getMongo(            
db.getReplicationInfo(  
db.getUser(
db.getCollectionNames(  
db.getName(             
db.getRole(             
db.getUsers(
db.getLastError(        
db.getPrevError(        
db.getRoles(            
db.getWriteConcern(
db.getLastErrorCmd(     
db.getProfilingLevel(   
db.getSiblingDB(
db.getLastErrorObj(     
db.getProfilingStatus(  
db.getSisterDB(

db.createCollection()

创建集合

db.mycoll.drop()

删除集合

db.storeCollection.save()

更新记录

db.storeCollection.findOne()

查询一条记录

db.storeColletion.find()

查询多条记录

db.sotreColletion.remove()

删除记录

db.dropDatabase()

删除当前的数据库,但上下文还是当前的

下面是其他删除的数据

db.dropAllRoles(  db.dropAllUsers(  db.dropDatabase(  db.dropRole(      db.dropUser(

db.serverStatus()

当前服务器的状态,查看是否存在问题,便于修复

mongodb 符号&查询

查询方式

$lt:< 
$lte:<= 
$gt:> 
$gte:>= 
$ne:!=

> db.student.find({age:{$lt:30}})
{ "_id" : 1, "name" : "zhangsan", "age" : 27, "sex" : 1 }
{ "_id" : 2, "name" : "lisi", "age" : 27 }
{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }
> db.student.find({age:{$ne:27}})
{ "_id" : 3, "name" : "wangwu", "age" : 30 }
{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }
{ "_id" : 5, "name" : "qianliu", "age" : 33 }
{ "_id" : 6, "name" : "sunba", "age" : 32 }

$in:包含$nin:不包含

> db.student.find({age:{$in:[27,28]}})
{ "_id" : 1, "name" : "zhangsan", "age" : 27, "sex" : 1 }
{ "_id" : 2, "name" : "lisi", "age" : 27 }
{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }
> db.student.find({age:{$nin:[27,28]}})
{ "_id" : 3, "name" : "wangwu", "age" : 30 }
{ "_id" : 5, "name" : "qianliu", "age" : 33 }
{ "_id" : 6, "name" : "sunba", "age" : 32 }

$or:或者

> db.student.find({$or:[{age:{$lt:29}}, {name:"sunba"}]})
{ "_id" : 1, "name" : "zhangsan", "age" : 27, "sex" : 1 }
{ "_id" : 2, "name" : "lisi", "age" : 27 }
{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }
{ "_id" : 6, "name" : "sunba", "age" : 32 }

null:空值

> db.student.find({sex: null})
{ "_id" : 2, "name" : "lisi", "age" : 27 }
{ "_id" : 3, "name" : "wangwu", "age" : 30 }
{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }
{ "_id" : 5, "name" : "qianliu", "age" : 33 }
{ "_id" : 6, "name" : "sunba", "age" : 32 }

$type:键是某种类型的
double:1
string:2
…

> db.student.insert({_id:7, name:7, age:70})
WriteResult({ "nInserted" : 1 })
> db.student.find({name: {$type: 2}})
{ "_id" : 1, "name" : "zhangsan", "age" : 27, "sex" : 1 }
{ "_id" : 2, "name" : "lisi", "age" : 27 }
{ "_id" : 3, "name" : "wangwu", "age" : 30 }
{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }
{ "_id" : 5, "name" : "qianliu", "age" : 33 }
{ "_id" : 6, "name" : "sunba", "age" : 32 }
> db.student.find({name: {$type: 1}})
{ "_id" : 7, "name" : 7, "age" : 70 }

正则表达式

> db.student.find({name: /si\b/})
{ "_id" : 2, "name" : "lisi", "age" : 27 }