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hl174:
写的不错,赞一个
在Java中字节与十六进制的相互转换主要思想有两点 -
l540151663:
也是个好方法
String为空判断
1:登陆进入bin目录下(win10 win+x 命令提示符管理员)
C:\Program Files\MongoDB\Server\3.2\bin
运行登陆命令
mongo 10.77.20.xx
2:退出登陆
exit
mongo命令直接加MongoDB服务器的IP地址(比如:mongo 10.77.20.xx),就可以利用Mongo的默认端口号(27017)登陆Mongo,然后便能够进行简单的命令行操作。
至于退出,直接exit,然后回车就好了。
3:查看服务器上的数据库
show dbs;
4:查看当前数据库
db ;
5:切换数据库
use test
6:创建数据库
use test2
7:删除数据库
> db.dropDatabase()
{ "dropped" : "test2", "ok" : 1 }
> show dbs
-------------------------详细教程-----------------------
MongoDB命令行操作
本文专门介绍MongoDB的命令行操作。其实,这些操作在MongoDB官网提供的Quick Reference上都有,但是英文的,为了方便,这里将其稍微整理下,方便查阅。
这里用来做测试的是远端(10.77.20.xx)的Mongo数据库。
1、登录和退出
mongo命令直接加MongoDB服务器的IP地址(比如:mongo 10.77.20.xx),就可以利用Mongo的默认端口号(27017)登陆Mongo,然后便能够进行简单的命令行操作。
至于退出,直接exit,然后回车就好了。
[plain]
$ mongo 10.77.20.xx
MongoDB shell version: 2.0.4
connecting to: 10.77.20.xx/test
> show collections
> exit
bye
从以上可以看出,登录后mongo会自动连上一个名为test的数据库。如果这个数据库不存在,那么mongo会自动建立一个名为test的数据库。上面的例子,由于Mongo服务器上没有名为test的db,因此,mongo新建了一个空的名为test的db。其中,没有任何collection。
2、database级操作
[plain]
2.1 查看服务器上的数据库
> show dbs
admin (empty)
back_up (empty)
blogtest 0.203125GB
local 44.056640625GB
test (empty)
2.2 切换数据库
切换到blogtest数据库(从默认的test数据库)
> use blogtest
switched to db blogtest
mongo中,db代表当前使用的数据库。这样,db就从原来的test,变为现在的blogtest数据库。
2.3 查看当前数据库中的所有集合
> show collections
book
system.indexes
user
2.4 创建数据库
mongo中创建数据库采用的也是use命令,如果use后面跟的数据库名不存在,那么mongo将会新建该数据库。不过,实际上只执行use命令后,mongo是不会新建该数据库的,直到你像该数据库中插入了数据。
> use test2
switched to db test2
> show dbs
admin (empty)
back_up (empty)
blogtest 0.203125GB
local 44.056640625GB
test (empty)
到这里并没有看到刚才新建的test2数据库。
> db.hello.insert({"name":"testdb"})
该操作会在test2数据库中新建一个hello集合,并在其中插入一条记录。
> show dbs
admin (empty)
back_up (empty)
blogtest 0.203125GB
local 44.056640625GB
test (empty)
test2 0.203125GB
> show collections
hello
system.indexes
这样,便可以看到mongo的确创建了test2数据库,其中有一个hello集合。
2.5 删除数据库
> db.dropDatabase()
{ "dropped" : "test2", "ok" : 1 }
> show dbs
admin (empty)
back_up (empty)
blogtest 0.203125GB
local 44.056640625GB
test (empty)
2.6 查看当前数据库
> db
test2
可以看出删除test2数据库之后,当前的db还是指向它,只有当切换数据库之后,test2才会彻底消失。
3、collection级操作
[plain]
3.1 新建collection
> db.createCollection("Hello")
{ "ok" : 1 }
> show collections
Hello
system.indexes
从上面2.4也可以看出,直接向一个不存在的collection中插入数据也能创建一个collection。
> db.hello2.insert({"name":"lfqy"})
> show collections
Hello
hello2
system.indexes
3.2 删除collection
> db.Hello.drop()
true
返回true说明删除成功,false说明没有删除成功。
> db.hello.drop()
false
不存在名为hello的collection,因此,删除失败。
3.3 重命名collection
将hello2集合重命名为HELLO
> show collections
hello2
system.indexes
> db.hello2.renameCollection("HELLO")
{ "ok" : 1 }
> show collections
HELLO
system.indexes
3.4 查看当前数据库中的所有collection
>show collections
3.5 建立索引在HELLO集合上,建立对ID字段的索引,1代表升序。
>db.HELLO.ensureIndex({ID:1})
4、Record级的操作
这一小节从这里开始,我们用事先存在的blogtest数据库做测试,其中有两个Collection,一个是book,另一个是user。
4.1 插入操作
[plain]
4.1.1 向user集合中插入两条记录
> db.user.insert({'name':'Gal Gadot','gender':'female','age':28,'salary':11000})
> db.user.insert({'name':'Mikie Hara','gender':'female','age':26,'salary':7000})
4.1.2 同样也可以用save完成类似的插入操作
> db.user.save({'name':'Wentworth Earl Miller','gender':'male','age':41,'salary':33000})
4.2 查找操作
4.2.1 查找集合中的所有记录
[plain]
> db.user.find()
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13 }
4.2.2 查找集合中的符合条件的记录
[plain]
(1)单一条件
a)Exact Equal:
查询age为了23的数据
> db.user.find({"age":23})
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
b)Great Than:
查询salary大于5000的数据
> db.user.find({salary:{$gt:5000}})
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
c)Fuzzy Match
查询name中包含'a'的数据
> db.user.find({name:/a/})
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
查询name以G打头的数据
> db.user.find({name:/^G/})
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
(2)多条件"与"
查询age小于30,salary大于6000的数据
> db.user.find({age:{$lt:30},salary:{$gt:6000}})
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
(3)多条件"或"
查询age小于25,或者salary大于10000的记录
> db.user.find({$or:[{salary:{$gt:10000}},{age:{$lt:25}}]})
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
4.2.3 查询第一条记录
将上面的find替换为findOne()可以查找符合条件的第一条记录。
[plain]
将上面的find替换为findOne()可以查找符合条件的第一条记录。
> db.user.findOne({$or:[{salary:{$gt:10000}},{age:{$lt:25}}]})
{
"_id" : ObjectId("52442736d8947fb501000001"),
"name" : "lfqy",
"gender" : "male",
"age" : 23,
"salary" : 15
}
4.2.4 查询记录的指定字段
[plain]
查询user集合中所有记录的name,age,salary,sex_orientation字段
> db.user.find({},{name:1,age:1,salary:1,sex_orientation:true})
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
注意:这里的1表示显示此列的意思,也可以用true表示。
4.2.5 查询指定字段的数据,并去重。
[plain]
查询gender字段的数据,并去掉重复数据
> db.user.distinct('gender')
[ "male", "female" ]
4.2.6 对查询结果集的操作
[plain]
(1)Pretty Print
为了方便,mongo也提供了pretty print工具,db.collection.pretty()或者是db.collection.forEach(printjson)
> db.user.find().pretty()
{
"_id" : ObjectId("52442736d8947fb501000001"),
"name" : "lfqy",
"gender" : "male",
"age" : 23,
"salary" : 15
}
{
"_id" : ObjectId("52453cfb25e437dfea8fd4f4"),
"name" : "Gal Gadot",
"gender" : "female",
"age" : 28,
"salary" : 11000
}
{
"_id" : ObjectId("52453d8525e437dfea8fd4f5"),
"name" : "Mikie Hara",
"gender" : "female",
"age" : 26,
"salary" : 7000
}
{
"_id" : ObjectId("52453e2125e437dfea8fd4f6"),
"name" : "Wentworth Earl Miller",
"gender" : "male",
"age" : 41,
"salary" : 33000
}
{
"_id" : ObjectId("52454155d8947fb70d000000"),
"name" : "not known",
"sex_orientation" : "male",
"age" : 13
}
(2)指定结果集显示的条目
a)显示结果集中的前3条记录
> db.user.find().limit(3)
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
b)查询第1条以后的所有数据
> db.user.find().skip(1)
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
c)对结果集排序
升序
> db.user.find().sort({salary:1})
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
降序
> db.user.find().sort({salary:-1})
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
4.2.7 统计查询结果中记录的条数
[plain]
(1)统计集合中的所有记录条数
> db.user.find().count()
5
(2)查询符合条件的记录数
查询salary小于4000或大于10000的记录数
> db.user.find({$or: [{salary: {$lt:4000}}, {salary: {$gt:10000}}]}).count()
4
4.3 删除操作
4.3.1 删除整个集合中的所有数据
[plain]
> db.test.insert({name:"asdf"})
> show collections
book
system.indexes
test
user
到这里新建了一个集合,名为test。
删除test中的所有记录。
> db.test.remove()
PRIMARY> show collections
book
system.indexes
test
user
> db.test.find()
可见test中的记录全部被删除。
注意db.collection.remove()和drop()的区别,remove()只是删除了集合中所有的记录,而集合中原有的索引等信息还在,而drop()则把集合相关信息整个删除(包括索引)。
4.3.2 删除集合中符合条件的所有记录
[plain]
> db.user.remove({name:'lfqy'})
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455cc825e437dfea8fd4f8"), "name" : "2", "gender" : "female", "age" : 28, "salary" : 2 }
{ "_id" : ObjectId("52455d8a25e437dfea8fd4fa"), "name" : "1", "gender" : "female", "age" : 28, "salary" : 1 }
> db.user.remove( {salary :{$lt:10}})
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
4.3.3 删除集合中符合条件的一条记录
[plain]
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455de325e437dfea8fd4fb"), "name" : "1", "gender" : "female", "age" : 28, "salary" : 1 }
{ "_id" : ObjectId("52455de925e437dfea8fd4fc"), "name" : "2", "gender" : "female", "age" : 28, "salary" : 2 }
> db.user.remove({salary :{$lt:10}},1)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455de925e437dfea8fd4fc"), "name" : "2", "gender" : "female", "age" : 28, "salary" : 2 }
当然,也可以是db.user.remove({salary :{$lt:10}},true)
4.4 更新操作
4.4.1 赋值更新
db.collection.update(criteria, objNew, upsert, multi )
criteria:update的查询条件,类似sql update查询内where后面的
objNew:update的对象和一些更新的操作符(如$,$inc...)等,也可以理解为sql update查询内set后面的。
upsert : 如果不存在update的记录,是否插入objNew,true为插入,默认是false,不插入。
multi : mongodb默认是false,只更新找到的第一条记录,如果这个参数为true,就把按条件查出来多条记录全部更新。
[plain]
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "name" : "lfqy", "gender" : "male", "age" : 28, "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "name" : "lfqy", "gender" : "male", "age" : 28, "salary" : 2 }
> db.user.update({name:'lfqy'},{$set:{age:23}},false,true)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 2 }
db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 2 }
> db.user.update({name:'lfqy1'},{$set:{age:23}},true,true)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 2 }
{ "_id" : ObjectId("5245610881c83a5bf26fc285"), "age" : 23, "name" : "lfqy1" }
> db.user.update({name:'lfqy'},{$set:{interest:"NBA"}},false,true)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("5245610881c83a5bf26fc285"), "age" : 23, "name" : "lfqy1" }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 2 }
4.4.2 增值更新
[plain]
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("5245610881c83a5bf26fc285"), "age" : 23, "name" : "lfqy1" }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 2 }
> db.user.update({gender:'female'},{$inc:{salary:50}},false,true)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11050 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7050 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("5245610881c83a5bf26fc285"), "age" : 23, "name" : "lfqy1" }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 2 }
关于更新操作(db.collection.update(criteria, objNew, upsert, multi )),要说明的是,如果upsert为true,那么在没有找到符合更新条件的情况下,mongo会在集合中插入一条记录其值满足更新条件的记录(其中的字段只有更新条件中涉及的字段,字段的值满足更新条件),然后将其更新(注意,如果更新条件是$lt这种不等式条件,那么upsert插入的记录只会包含更新操作涉及的字段,而不会有更新条件中的字段。这也很好理解,因为没法为这种字段定值,mongo索性就不取这些字段)。如果符合条件的记录中没有要更新的字段,那么mongo会为其创建该字段,并更新。
上面大致介绍了MongoDB命令行中所涉及的操作,只是为了记录和查阅。细心的也许会发现,这篇文章,越往后我的耐心越少。期待有时间能分享一些not very navie的东西。
C:\Program Files\MongoDB\Server\3.2\bin
运行登陆命令
mongo 10.77.20.xx
2:退出登陆
exit
mongo命令直接加MongoDB服务器的IP地址(比如:mongo 10.77.20.xx),就可以利用Mongo的默认端口号(27017)登陆Mongo,然后便能够进行简单的命令行操作。
至于退出,直接exit,然后回车就好了。
3:查看服务器上的数据库
show dbs;
4:查看当前数据库
db ;
5:切换数据库
use test
6:创建数据库
use test2
7:删除数据库
> db.dropDatabase()
{ "dropped" : "test2", "ok" : 1 }
> show dbs
-------------------------详细教程-----------------------
MongoDB命令行操作
本文专门介绍MongoDB的命令行操作。其实,这些操作在MongoDB官网提供的Quick Reference上都有,但是英文的,为了方便,这里将其稍微整理下,方便查阅。
这里用来做测试的是远端(10.77.20.xx)的Mongo数据库。
1、登录和退出
mongo命令直接加MongoDB服务器的IP地址(比如:mongo 10.77.20.xx),就可以利用Mongo的默认端口号(27017)登陆Mongo,然后便能够进行简单的命令行操作。
至于退出,直接exit,然后回车就好了。
[plain]
$ mongo 10.77.20.xx
MongoDB shell version: 2.0.4
connecting to: 10.77.20.xx/test
> show collections
> exit
bye
从以上可以看出,登录后mongo会自动连上一个名为test的数据库。如果这个数据库不存在,那么mongo会自动建立一个名为test的数据库。上面的例子,由于Mongo服务器上没有名为test的db,因此,mongo新建了一个空的名为test的db。其中,没有任何collection。
2、database级操作
[plain]
2.1 查看服务器上的数据库
> show dbs
admin (empty)
back_up (empty)
blogtest 0.203125GB
local 44.056640625GB
test (empty)
2.2 切换数据库
切换到blogtest数据库(从默认的test数据库)
> use blogtest
switched to db blogtest
mongo中,db代表当前使用的数据库。这样,db就从原来的test,变为现在的blogtest数据库。
2.3 查看当前数据库中的所有集合
> show collections
book
system.indexes
user
2.4 创建数据库
mongo中创建数据库采用的也是use命令,如果use后面跟的数据库名不存在,那么mongo将会新建该数据库。不过,实际上只执行use命令后,mongo是不会新建该数据库的,直到你像该数据库中插入了数据。
> use test2
switched to db test2
> show dbs
admin (empty)
back_up (empty)
blogtest 0.203125GB
local 44.056640625GB
test (empty)
到这里并没有看到刚才新建的test2数据库。
> db.hello.insert({"name":"testdb"})
该操作会在test2数据库中新建一个hello集合,并在其中插入一条记录。
> show dbs
admin (empty)
back_up (empty)
blogtest 0.203125GB
local 44.056640625GB
test (empty)
test2 0.203125GB
> show collections
hello
system.indexes
这样,便可以看到mongo的确创建了test2数据库,其中有一个hello集合。
2.5 删除数据库
> db.dropDatabase()
{ "dropped" : "test2", "ok" : 1 }
> show dbs
admin (empty)
back_up (empty)
blogtest 0.203125GB
local 44.056640625GB
test (empty)
2.6 查看当前数据库
> db
test2
可以看出删除test2数据库之后,当前的db还是指向它,只有当切换数据库之后,test2才会彻底消失。
3、collection级操作
[plain]
3.1 新建collection
> db.createCollection("Hello")
{ "ok" : 1 }
> show collections
Hello
system.indexes
从上面2.4也可以看出,直接向一个不存在的collection中插入数据也能创建一个collection。
> db.hello2.insert({"name":"lfqy"})
> show collections
Hello
hello2
system.indexes
3.2 删除collection
> db.Hello.drop()
true
返回true说明删除成功,false说明没有删除成功。
> db.hello.drop()
false
不存在名为hello的collection,因此,删除失败。
3.3 重命名collection
将hello2集合重命名为HELLO
> show collections
hello2
system.indexes
> db.hello2.renameCollection("HELLO")
{ "ok" : 1 }
> show collections
HELLO
system.indexes
3.4 查看当前数据库中的所有collection
>show collections
3.5 建立索引在HELLO集合上,建立对ID字段的索引,1代表升序。
>db.HELLO.ensureIndex({ID:1})
4、Record级的操作
这一小节从这里开始,我们用事先存在的blogtest数据库做测试,其中有两个Collection,一个是book,另一个是user。
4.1 插入操作
[plain]
4.1.1 向user集合中插入两条记录
> db.user.insert({'name':'Gal Gadot','gender':'female','age':28,'salary':11000})
> db.user.insert({'name':'Mikie Hara','gender':'female','age':26,'salary':7000})
4.1.2 同样也可以用save完成类似的插入操作
> db.user.save({'name':'Wentworth Earl Miller','gender':'male','age':41,'salary':33000})
4.2 查找操作
4.2.1 查找集合中的所有记录
[plain]
> db.user.find()
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13 }
4.2.2 查找集合中的符合条件的记录
[plain]
(1)单一条件
a)Exact Equal:
查询age为了23的数据
> db.user.find({"age":23})
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
b)Great Than:
查询salary大于5000的数据
> db.user.find({salary:{$gt:5000}})
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
c)Fuzzy Match
查询name中包含'a'的数据
> db.user.find({name:/a/})
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
查询name以G打头的数据
> db.user.find({name:/^G/})
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
(2)多条件"与"
查询age小于30,salary大于6000的数据
> db.user.find({age:{$lt:30},salary:{$gt:6000}})
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
(3)多条件"或"
查询age小于25,或者salary大于10000的记录
> db.user.find({$or:[{salary:{$gt:10000}},{age:{$lt:25}}]})
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
4.2.3 查询第一条记录
将上面的find替换为findOne()可以查找符合条件的第一条记录。
[plain]
将上面的find替换为findOne()可以查找符合条件的第一条记录。
> db.user.findOne({$or:[{salary:{$gt:10000}},{age:{$lt:25}}]})
{
"_id" : ObjectId("52442736d8947fb501000001"),
"name" : "lfqy",
"gender" : "male",
"age" : 23,
"salary" : 15
}
4.2.4 查询记录的指定字段
[plain]
查询user集合中所有记录的name,age,salary,sex_orientation字段
> db.user.find({},{name:1,age:1,salary:1,sex_orientation:true})
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
注意:这里的1表示显示此列的意思,也可以用true表示。
4.2.5 查询指定字段的数据,并去重。
[plain]
查询gender字段的数据,并去掉重复数据
> db.user.distinct('gender')
[ "male", "female" ]
4.2.6 对查询结果集的操作
[plain]
(1)Pretty Print
为了方便,mongo也提供了pretty print工具,db.collection.pretty()或者是db.collection.forEach(printjson)
> db.user.find().pretty()
{
"_id" : ObjectId("52442736d8947fb501000001"),
"name" : "lfqy",
"gender" : "male",
"age" : 23,
"salary" : 15
}
{
"_id" : ObjectId("52453cfb25e437dfea8fd4f4"),
"name" : "Gal Gadot",
"gender" : "female",
"age" : 28,
"salary" : 11000
}
{
"_id" : ObjectId("52453d8525e437dfea8fd4f5"),
"name" : "Mikie Hara",
"gender" : "female",
"age" : 26,
"salary" : 7000
}
{
"_id" : ObjectId("52453e2125e437dfea8fd4f6"),
"name" : "Wentworth Earl Miller",
"gender" : "male",
"age" : 41,
"salary" : 33000
}
{
"_id" : ObjectId("52454155d8947fb70d000000"),
"name" : "not known",
"sex_orientation" : "male",
"age" : 13
}
(2)指定结果集显示的条目
a)显示结果集中的前3条记录
> db.user.find().limit(3)
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
b)查询第1条以后的所有数据
> db.user.find().skip(1)
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
c)对结果集排序
升序
> db.user.find().sort({salary:1})
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
降序
> db.user.find().sort({salary:-1})
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52442736d8947fb501000001"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 15 }
4.2.7 统计查询结果中记录的条数
[plain]
(1)统计集合中的所有记录条数
> db.user.find().count()
5
(2)查询符合条件的记录数
查询salary小于4000或大于10000的记录数
> db.user.find({$or: [{salary: {$lt:4000}}, {salary: {$gt:10000}}]}).count()
4
4.3 删除操作
4.3.1 删除整个集合中的所有数据
[plain]
> db.test.insert({name:"asdf"})
> show collections
book
system.indexes
test
user
到这里新建了一个集合,名为test。
删除test中的所有记录。
> db.test.remove()
PRIMARY> show collections
book
system.indexes
test
user
> db.test.find()
可见test中的记录全部被删除。
注意db.collection.remove()和drop()的区别,remove()只是删除了集合中所有的记录,而集合中原有的索引等信息还在,而drop()则把集合相关信息整个删除(包括索引)。
4.3.2 删除集合中符合条件的所有记录
[plain]
> db.user.remove({name:'lfqy'})
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455cc825e437dfea8fd4f8"), "name" : "2", "gender" : "female", "age" : 28, "salary" : 2 }
{ "_id" : ObjectId("52455d8a25e437dfea8fd4fa"), "name" : "1", "gender" : "female", "age" : 28, "salary" : 1 }
> db.user.remove( {salary :{$lt:10}})
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
4.3.3 删除集合中符合条件的一条记录
[plain]
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455de325e437dfea8fd4fb"), "name" : "1", "gender" : "female", "age" : 28, "salary" : 1 }
{ "_id" : ObjectId("52455de925e437dfea8fd4fc"), "name" : "2", "gender" : "female", "age" : 28, "salary" : 2 }
> db.user.remove({salary :{$lt:10}},1)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455de925e437dfea8fd4fc"), "name" : "2", "gender" : "female", "age" : 28, "salary" : 2 }
当然,也可以是db.user.remove({salary :{$lt:10}},true)
4.4 更新操作
4.4.1 赋值更新
db.collection.update(criteria, objNew, upsert, multi )
criteria:update的查询条件,类似sql update查询内where后面的
objNew:update的对象和一些更新的操作符(如$,$inc...)等,也可以理解为sql update查询内set后面的。
upsert : 如果不存在update的记录,是否插入objNew,true为插入,默认是false,不插入。
multi : mongodb默认是false,只更新找到的第一条记录,如果这个参数为true,就把按条件查出来多条记录全部更新。
[plain]
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "name" : "lfqy", "gender" : "male", "age" : 28, "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "name" : "lfqy", "gender" : "male", "age" : 28, "salary" : 2 }
> db.user.update({name:'lfqy'},{$set:{age:23}},false,true)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 2 }
db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 2 }
> db.user.update({name:'lfqy1'},{$set:{age:23}},true,true)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "name" : "lfqy", "gender" : "male", "age" : 23, "salary" : 2 }
{ "_id" : ObjectId("5245610881c83a5bf26fc285"), "age" : 23, "name" : "lfqy1" }
> db.user.update({name:'lfqy'},{$set:{interest:"NBA"}},false,true)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("5245610881c83a5bf26fc285"), "age" : 23, "name" : "lfqy1" }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 2 }
4.4.2 增值更新
[plain]
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11000 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7000 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("5245610881c83a5bf26fc285"), "age" : 23, "name" : "lfqy1" }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 2 }
> db.user.update({gender:'female'},{$inc:{salary:50}},false,true)
> db.user.find()
{ "_id" : ObjectId("52453cfb25e437dfea8fd4f4"), "name" : "Gal Gadot", "gender" : "female", "age" : 28, "salary" : 11050 }
{ "_id" : ObjectId("52453d8525e437dfea8fd4f5"), "name" : "Mikie Hara", "gender" : "female", "age" : 26, "salary" : 7050 }
{ "_id" : ObjectId("52453e2125e437dfea8fd4f6"), "name" : "Wentworth Earl Miller", "gender" : "male", "age" : 41, "salary" : 33000 }
{ "_id" : ObjectId("52454155d8947fb70d000000"), "name" : "not known", "sex_orientation" : "male", "age" : 13, "salary" : 30000 }
{ "_id" : ObjectId("5245610881c83a5bf26fc285"), "age" : 23, "name" : "lfqy1" }
{ "_id" : ObjectId("52455f8925e437dfea8fd4fd"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 1 }
{ "_id" : ObjectId("5245607525e437dfea8fd4fe"), "age" : 23, "gender" : "male", "interest" : "NBA", "name" : "lfqy", "salary" : 2 }
关于更新操作(db.collection.update(criteria, objNew, upsert, multi )),要说明的是,如果upsert为true,那么在没有找到符合更新条件的情况下,mongo会在集合中插入一条记录其值满足更新条件的记录(其中的字段只有更新条件中涉及的字段,字段的值满足更新条件),然后将其更新(注意,如果更新条件是$lt这种不等式条件,那么upsert插入的记录只会包含更新操作涉及的字段,而不会有更新条件中的字段。这也很好理解,因为没法为这种字段定值,mongo索性就不取这些字段)。如果符合条件的记录中没有要更新的字段,那么mongo会为其创建该字段,并更新。
上面大致介绍了MongoDB命令行中所涉及的操作,只是为了记录和查阅。细心的也许会发现,这篇文章,越往后我的耐心越少。期待有时间能分享一些not very navie的东西。
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1. **添加 MongoDB 可执行文件到 PATH 路径**: ```bash export PATH=/usr/local/mongodb7.0.2/bin:$PATH ``` 2. **创建数据存储目录和日志文件目录**: ```bash mkdir -p /usr/local/mongodb7.0.2/data/db ...
1. 下载 MongoDB Windows 版 2. 设置数据文件和日志文件的存放目录 3. 启动 MongoDB 服务 4. 将 MongoDB 作为 Windows 服务随机启动 5. 安装 MongoDB VUE 在 Windows 环境下安装 MongoDB 需要下载 MongoDB Windows ...
总结,MongoDB在Ubuntu 18.04 ARM 64环境下可以提供强大的文档数据库服务。通过遵循上述步骤,你可以成功安装并运行MongoDB,从而利用其优势处理非结构化数据。对于嵌入式硬件而言,MongoDB的灵活性和性能使其成为...