MongoDB入门(4)- MongoDB日常操作

MongoDB客户端

MongoDB有很多客户端
MongoVue
Robomongo

MongoDB命令行

启动mongo shell

在windows下,双击mongo.exe可以启动mongo shell

查询库、表及选择库

查询所有库命令:

show dbs

应用某一个db

use jxs_database

查询此db里面所有collection

show collections

查询数据

去重查询

db.getCollection('MonitorInfo').distinct("Level")

查询所有数据

db.asset_entity.find()

查询一条数据

db.asset_entity.findOne()

查询条数

db.asset_entity.find()

查询某一条符合条件的数据

db.asset_entity.find({"voucher_number":"5555"})

只查询某一列数据

db.asset_entity.find({},{"change_time":true})

db.asset_entity.findOne({"voucher_number":"444345"})

查询符合条件的某N列数据

db.asset_entity.find({"voucher_number":"5555"},{"change_time":true,})

db.asset_entity.find({"voucher_number":"5555"},{"change_time":true,"voucher_number":true})

查询在18~30岁(含)的用户

db.users.find({"age" : {"$gte" : 18, "$lte" : 30}})

要查找在2007年1月1日前注册的人,可以像下面这样:

>start = new Date("01/01/2007")
>db.users.find({"registered" : {"$lt" : start}})

查找排序

db.getCollection('ReportLog').find({}).sort({"createtime":1})

like查找

db.getCollection('ReportClientMongoLog').find({"Msg":/.*工作.*/}).count()
db.getCollection('ReportClientMongoLog').find({"Msg":/.*闲置.*/}).count()
db.getCollection('SalaryEntity').find({"Month" : "201601"})
db.getCollection('SalaryEntity').find({"Month" : "201601", "DepartName" : "运维与管理软件部"})
db.getCollection('ReportClientMongoLog').find({"Ip":"192.168.88.136"},{"CreateTime":true}).sort({"CreateTime":-1})
db.getCollection('ReportClientMongoLog').find().count()
db.getCollection('SalaryEntity').find({"Month" : "201601"},{"DepartName":true})

删除数据

删除符合条件的数据

db.asset_entity.remove({"voucher_number":"5555"})

db.getCollection('MyVersion').remove({})

db.getCollection('ReportHeartBeatKey').remove({"Ip":/.*88.*/})

更新数据

db.asset_check.update({"asset_num":"NUM19"},{"$set":{"model":"x230i"}},false,true)

如果没有后面两个参数,则只更新一行数据。
db.getCollection('PersonBaseInfo').update(
    // query 
    {
        "DepartName" : "MIS与互联网部"
    },
    
    // update 
    {
        "$set":
        {        
            "DepartName" : "互联网与无线电项目部"
        }
    },
    
    // options 
    {
        "multi" : true,  // update only one document 
        "upsert" : false  // insert a new document, if no existing document match the query 
    }
);

插入数据

插入一条数据

db.asset_type.insert({"serialId":"161261","name":"mytest","pid":"16126"})

更改表结构

mongo里面没有表结构这个概念,现在采用类似关系型数据库的形式来描述。如果想去掉collection里面的一个key,可以采用以下命令:

db.UserEntity.update({},{$unset:{Mail:1}},false,true);

上面的命令从表UserEntity中删除一个字段Mail。
关于unset的具体说明

$unset
The $unset operator deletes a particular field. Consider the following syntax:

{ $unset: { <field1>: "", ... } }
The specified value in the $unset expression (i.e. "") does not impact the operation.

To specify a <field> in an embedded document or in an array, use dot notation.

Behavior

If the field does not exist, then $unset does nothing (i.e. no operation).

When used with $ to match an array element, $unset replaces the matching element with null rather than removing the matching element from the array. This behavior keeps consistent the array size and element positions.

Example

The following update() operation uses the $unset operator to remove the fields quantity and instock from the first document in the products collection where the field sku has a value of unknown.

db.products.update(
   { sku: "unknown" },
   { $unset: { quantity: "", instock: "" } }
)
SEE ALSO
posted @ 2016-08-23 14:42  wardensky  阅读(3010)  评论(0编辑  收藏  举报