MongoDB基本操作

服务启动：mongod -f /mongod/28018/conf/mongod.conf
链接：mongo --host 192.168.244.137:28018
查看当前数据库
> db
test
查看版本
> db.version()
3.6.21-rc2
切换数据库
> use admin
switched to db admin
获取当前数据库名称
> db.getName()
admin
查看所有数据库
> show dbs
admin 0.000GB
clsn 0.000GB
config 0.000GB
local 0.000GB
查看所有数据库
> show databases;
admin 0.000GB
clsn 0.000GB
config 0.000GB
local 0.000GB
查看数据库状态
> db.stats()
{
"db" : "admin",
"collections" : 1,
"views" : 0,
"objects" : 1,
"avgObjSize" : 59,
"dataSize" : 59,
"storageSize" : 16384,
"numExtents" : 0,
"indexes" : 1,
"indexSize" : 16384,
"fsUsedSize" : 9226117120,
"fsTotalSize" : 18238930944,
"ok" : 1
}
查看当前数据库谅解机器的地址
> db.getMongo()
connection to 127.0.0.1:27017
创建集合
> db.createCollection('a')
{ "ok" : 1 }
> db.createCollection('b')
{ "ok" : 1 }
查看集合
> show collections
a
b
system.version
创建集合并插入信息
> db.c.insert({'name': 'kobe'})
WriteResult({ "nInserted" : 1 })
> db.c.insert({'name': 'jordon'})
WriteResult({ "nInserted" : 1 })
> db.c.insert({'index': 1})
WriteResult({ "nInserted" : 1 })
查看当前库下所有集合
> db.getCollectionNames()
[ "a", "b", "c", "system.version" ]
查看某集合的内容
> db.c.find()
{ "_id" : ObjectId("5fad2c306a57b8dbe80f69f8"), "name" : "kobe" }
{ "_id" : ObjectId("5fad2c446a57b8dbe80f69f9"), "name" : "jordon" }
{ "_id" : ObjectId("5fad2c6a6a57b8dbe80f69fa"), "index" : 1 }
重命名集合
> db.c.renameCollection('d')
{ "ok" : 1 }
> db.getCollectionNames()
[ "a", "b", "d", "system.version" ]
删除集合
> db.a.drop()
true
> db.getCollectionNames()
[ "b", "d", "system.version" ]
查找集合第一条数据

> db.mongodata.findOne()
{
"_id" : ObjectId("5fad2d5d6a57b8dbe80f69fb"),
"uid" : 0,
"name" : "mongo",
"age" : 10,
"date" : ISODate("2020-11-12T12:41:01.277Z")
}
查询总数
> db.mongodata.count()
10000
按uid查询
> db.mongodata.find({'uid': 100})
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a5f"), "uid" : 100, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.371Z") }

查询去掉当前集合中某列的重复数据

> db.mongodata.distinct('name')
[ "mongo" ]
创建集合并插入10000条数据
> for(i=0; i<10000; i++){db.mongodata.insert({'uid': i, 'name': 'mongo', 'age': 10, 'date': new Date()})}
WriteResult({ "nInserted" : 1 })
> db.mongodata.find()
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f69fb"), "uid" : 0, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.277Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f69fc"), "uid" : 1, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.311Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f69fd"), "uid" : 2, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.312Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f69fe"), "uid" : 3, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.313Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f69ff"), "uid" : 4, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.313Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a00"), "uid" : 5, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.314Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a01"), "uid" : 6, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.315Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a02"), "uid" : 7, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.317Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a03"), "uid" : 8, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.319Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a04"), "uid" : 9, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.320Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a05"), "uid" : 10, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.320Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a06"), "uid" : 11, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.321Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a07"), "uid" : 12, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.321Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a08"), "uid" : 13, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.322Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a09"), "uid" : 14, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.322Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a0a"), "uid" : 15, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.323Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a0b"), "uid" : 16, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.323Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a0c"), "uid" : 17, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.324Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a0d"), "uid" : 18, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.325Z") }
{ "_id" : ObjectId("5fad2d5d6a57b8dbe80f6a0e"), "uid" : 19, "name" : "mongo", "age" : 10, "date" : ISODate("2020-11-12T12:41:01.325Z") }
Type "it" for more
删除集合所有元素
> db.mongodata.remove({})
WriteResult({ "nRemoved" : 10000 })
查看集合数据原始大小
> db.mongodata.dataSize()
0
集合索引数据原始大小
> db.mongodata.totalIndexSize()
102400
集合索引+数据压缩存储后的大小
> db.mongodata.totalSize()
356352
集合数据压缩存储大小
> db.mongodata.storageSize()
253952