mongodb 对标的国产数据库 mongodb数据库基本操作

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话不是这么说的 2024-08-03 13:39:47

文章标签 mongodb 对标的国产数据库数据库 mongodb linux 文章分类 MongoDB 数据库

一。 mongodb简介

MongoDB 是一个介于关系数据库和非关系数据库之间的产品，是非关系数据库当中功能最丰富，最像关系数据库的。他支持的数据结构非常松散，是类似json的bson格式，因此可以存储比较复杂的数据类型。Mongo最大的特点是他支持的查询语言非常强大，其语法有点类似于面向对象的查询语言，几乎可以实现类似关系数据库单表查询的绝大部分功能，而且还支持对数据建立索引

MongoDB类似于solr的数据传输格式，在mongodb中基本的概念是文档、集合、数据库

SQL术语/概念	MongoDB术语/概念	解释/说明
database	database	数据库
table	collection	数据库表/集合
row	document	数据记录行/文档
column	field	数据字段/域
index	index	索引
table joins		表连接,MongoDB不支持
primary key	primary key	主键,MongoDB自动将_id字段设置为主键

二。mongodb安装和常用操作

1》mongodb安装

下载安装包（机器为 centos6 ） https://www.mongodb.com/download-center?jmp=nav#community

wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-3.4.9.tgz
tar zxvf mongodb-linux-x86_64-rhel62-3.4.9.tgz
[root@bogon mongodb-linux-x86_64-rhel62-3.4.9]# ll
total 120
drwxr-xr-x. 2 root root  4096 Sep 19 06:54 bin
-rw-r--r--. 1 root root 34520 Sep 11 11:21 GNU-AGPL-3.0
-rw-r--r--. 1 root root 16726 Sep 11 11:21 MPL-2
-rw-r--r--. 1 root root  1359 Sep 11 11:21 README
-rw-r--r--. 1 root root 55625 Sep 11 11:21 THIRD-PARTY-NOTICES

这里下载的包是编译好的程序所以直接将 bin目录写入PATH

修改 ~/.bash_profile文件 export PATH前添加

PATH=$PATH:/root/mongodb-linux-x86_64-rhel62-3.4.9/bin

执行source ~/.bash_profile 让配置马上生效

启动报错

exception in initAndListen: 29 Data directory /data/db not found., terminating

需要插件/data/db目录默认的存储目录

mkdir -p /data/db

启动 mongodb

[root@bogon mongodb-linux-x86_64-rhel62-3.4.9]# mongod
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten] MongoDB starting : pid=1494 port=27017 dbpath=/data/db 64-bit host=bogon
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten] db version v3.4.9
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten] git version: 876ebee8c7dd0e2d992f36a848ff4dc50ee6603e
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten] allocator: tcmalloc
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten] modules: none
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten] build environment:
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten]     distmod: rhel62
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten]     distarch: x86_64
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten]     target_arch: x86_64
2017-09-20T05:40:40.731-0400 I CONTROL  [initandlisten] options: {}
2017-09-20T05:40:40.734-0400 W -        [initandlisten] Detected unclean shutdown - /data/db/mongod.lock is not empty.
2017-09-20T05:40:40.813-0400 I -        [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2017-09-20T05:40:40.814-0400 W STORAGE  [initandlisten] Recovering data from the last clean checkpoint.
2017-09-20T05:40:40.814-0400 I STORAGE  [initandlisten] 
2017-09-20T05:40:40.814-0400 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2017-09-20T05:40:40.814-0400 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2017-09-20T05:40:40.814-0400 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=256M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),
2017-09-20T05:40:42.872-0400 I CONTROL  [initandlisten] 
2017-09-20T05:40:42.872-0400 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-09-20T05:40:42.872-0400 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-09-20T05:40:42.872-0400 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2017-09-20T05:40:42.872-0400 I CONTROL  [initandlisten] 
2017-09-20T05:40:42.874-0400 I CONTROL  [initandlisten] 
2017-09-20T05:40:42.874-0400 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2017-09-20T05:40:42.874-0400 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-09-20T05:40:42.874-0400 I CONTROL  [initandlisten] 
2017-09-20T05:40:42.874-0400 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-09-20T05:40:42.874-0400 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-09-20T05:40:42.874-0400 I CONTROL  [initandlisten] 
2017-09-20T05:40:42.951-0400 I FTDC     [initandlisten] Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data'

使用客户端尝试连接测试（默认securecrt 输入客户端命令无法退格所以修改仿真界面）点击工具栏 - 选项 - 回话选项点击仿真

mongodb 对标的国产数据库 mongodb数据库基本操作_mongodb 对标的国产数据库

尝试使用mongo命令连接

默认该命令连接localhost和端口 27017 通过 --host 指定主机 --port指定端口

比如mongo --host localhost --port 27017

[root@bogon ~]# mongo
MongoDB shell version v3.4.9
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.9
Server has startup warnings: 
2017-09-20T05:47:58.590-0400 I STORAGE  [initandlisten] 
2017-09-20T05:47:58.590-0400 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2017-09-20T05:47:58.590-0400 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] 
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] 
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] 
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] 
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-09-20T05:47:59.273-0400 I CONTROL  [initandlisten] 
> 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
>

2》mongodb常用操作
》》数据库操作

=》show dbs --查看所有的数据库

> show dbs
admin  0.000GB 系统信息 比如授权 版本等
local  0.000GB 存储当前节点数据库的信息 不会被拷贝到集群中的其他节点中 每个节点都有自己的local

=》use test --进入某个数据库这个数据库可以是没有创建的

=》

> use test
switched to db test
> db
test
> show dbs  --虽然可以进入数据库列表中并不存在 因为test中没有数据 有数据后才能显示
admin  0.000GB
local  0.000GB

=》 > db.集合名称.insert(json数据) --数据库中存在多个集合集合中插入多个jsondoc 只要存在数据这个数据库就会自动创建并显示

> use test                         进入test数据库
switched to db test
> db.userList.insert({"name":"zs"})   test数据库的集合 userList中插入json 
WriteResult({ "nInserted" : 1 })
> show dbs
admin  0.000GB
local  0.000GB
test   0.000GB 被创建了

=》 > db.dropDatabase() --删除数据库进入哪个数据库就删除哪个

> use test
switched to db test
> db.dropDatabase()
{ "dropped" : "test", "ok" : 1 }

=》

> show collections --显示当前数据库下所有的集合

> use admin
switched to db admin
> show collections
system.version

》》集合操作

=》 > db.集合名称.insert(json数据) --进入哪个数据库就在哪个数据库创建集合

> use test
switched to db test
> db.my.insert({"name":"zs"})
WriteResult({ "nInserted" : 1 })

=》 > db.集合名称.find（） --查看集合的数据

查看admin数据库下的版本信息集合

> use admin
switched to db admin
> show collections
system.version
> db.system.version.find()
{ "_id" : "featureCompatibilityVersion", "version" : "3.4" }

查看local数据库下的启动日志集合

> use local
switched to db local
> show collections
startup_log
> db.startup_log.find()
{ "_id" : "bogon-1506647800402", "hostname" : "bogon", "startTime" : ISODate("2017-09-29T01:16:40Z"), "startTimeLocal" : "Thu Sep 28 18:16:40.402", "cmdLine" : {  }, "pid" : NumberLong(2682), "buildinfo" : { "version" : "3.4.9", "gitVersion" : "876ebee8c7dd0e2d992f36a848ff4dc50ee6603e", "modules" : [ ], "allocator" : "tcmalloc", "javascriptEngine" : "mozjs", "sysInfo" : "deprecated", "versionArray" : [ 3, 4, 9, 0 ], "openssl" : { "running" : "OpenSSL 1.0.1e-fips 11 Feb 2013", "compiled" : "OpenSSL 1.0.1e-fips 11 Feb 2013" }, "buildEnvironment" : { "distmod" : "rhel70", "distarch" : "x86_64", "cc" : "/opt/mongodbtoolchain/v2/bin/gcc: gcc (GCC) 5.4.0", "ccflags" : "-fno-omit-frame-pointer -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -Werror -O2 -Wno-unused-local-typedefs -Wno-unused-function -Wno-deprecated-declarations -Wno-unused-but-set-variable -Wno-missing-braces -fstack-protector-strong -fno-builtin-memcmp", "cxx" : "/opt/mongodbtoolchain/v2/bin/g++: g++ (GCC) 5.4.0", "cxxflags" : "-Woverloaded-virtual -Wno-maybe-uninitialized -std=c++11", "linkflags" : "-pthread -Wl,-z,now -rdynamic -Wl,--fatal-warnings -fstack-protector-strong -fuse-ld=gold -Wl,--build-id -Wl,-z,noexecstack -Wl,--warn-execstack -Wl,-z,relro", "target_arch" : "x86_64", "target_os" : "linux" }, "bits" : 64, "debug" : false, "maxBsonObjectSize" : 16777216, "storageEngines" : [ "devnull", "ephemeralForTest", "mmapv1", "wiredTiger" ] } }

=》 > db.集合名称.drop() --删除集合

> use test
switched to db test
> show collections
my
userList
> db.userList.drop()
true
> show collections
my

=》 > 使用js语法循环显示集合所有的方法

第一种是help来显示所有方法

> db.test.help
function () {
    var shortName = this.getName();
    print("DBCollection help");
    print("\tdb." + shortName + ".find().help() - show DBCursor help");
    print(
        "\tdb." + shortName +
        ".bulkWrite( operations, <optional params> ) - bulk execute write operations, optional parameters are: w, wtimeout, j");
    print(
        "\tdb." + shortName +
        ".count( query = {}, <optional params> ) - count the number of documents that matches the query, optional parameters are: limit, skip, hint, maxTimeMS");
    print(

第二种使用js语法 mongodb默认支持js用法可以定义变量逻辑操作等

> for(var i in db.userList){print(i)}
_mongo
_db
_shortName
_fullName
initializeUnorderedBulkOp
initializeOrderedBulkOp
verify
getName
help
getFullName
getMongo
getDB
runCommand
runReadCommand
find
findOne
insert
remove
_validateUpdateDoc
_parseUpdate
update
save
createIndex
createIndexes
ensureIndex
reIndex
dropIndexes
drop
findAndModify
renameCollection
validate
diskStorageStats
getDiskStorageStats
pagesInRAM
getPagesInRAM
getShardVersion
_getIndexesSystemIndexes
_getIndexesCommand
getIndexes
getIndices
getIndexSpecs
getIndexKeys
hashAllDocs
dropIndex
copyTo
getCollection
stats
dataSize
storageSize
totalIndexSize
totalSize
convertToCapped
exists
isCapped
aggregate
group
groupcmd
convertToSingleObject
mapReduce
toString
tojson
shellPrint
getShardDistribution
getSplitKeysForChunks
setSlaveOk
getSlaveOk
getQueryOptions
getPlanCache
setWriteConcern
getWriteConcern
count
distinct

addIdIfNeeded
bulkWrite
insertOne
insertMany
deleteOne
deleteMany
replaceOne
updateOne
updateMany
findOneAndDelete
findOneAndReplace
findOneAndUpdate
explain

》》文档操作

=》插入文档 db.集合.insert(文档json)

同一个集合插入两个文档每个文档都会自动创建一个_id的唯一标识符

> db.roleList.insert({"name":"admin"})
WriteResult({ "nInserted" : 1 })
> db.roleList.insert({"name":"dba"})
WriteResult({ "nInserted" : 1 })
> db.roleList.find()
{ "_id" : ObjectId("59cdb84b3fc8107a74a9010e"), "name" : "admin" }
{ "_id" : ObjectId("59cdb8503fc8107a74a9010f"), "name" : "dba" }

=》更新文档

db.集合.update(查询条件，更新后的文档，不存在是否插入，是否更新所有查询到的文档默认false 只更新第一条)

> db.roleList.find()
{ "_id" : ObjectId("59cdb84b3fc8107a74a9010e"), "name" : "admin" }
{ "_id" : ObjectId("59cdb8503fc8107a74a9010f"), "name" : "dba" }
> db.roleList.update({name:'admin'},{name:'admin',des:'super'})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.roleList.find()
{ "_id" : ObjectId("59cdb84b3fc8107a74a9010e"), "name" : "admin", "des" : "super" }
{ "_id" : ObjectId("59cdb8503fc8107a74a9010f"), "name" : "dba" }

save方法通过_id来查询文档直接覆盖对应的数据

> db.roleList.find()
{ "_id" : ObjectId("59cdb84b3fc8107a74a9010e"), "name" : "admin", "des" : "super" }
{ "_id" : ObjectId("59cdb8503fc8107a74a9010f"), "name" : "dba" }
{ "_id" : ObjectId("59cdba583fc8107a74a90110"), "name" : "admin", "des" : "super" }
> db.roleList.save({name:'admin',des:'super11',"_id" : ObjectId("59cdb84b3fc8107a74a9010e")})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.roleList.find()
{ "_id" : ObjectId("59cdb84b3fc8107a74a9010e"), "name" : "admin", "des" : "super11" }
{ "_id" : ObjectId("59cdb8503fc8107a74a9010f"), "name" : "dba" }
{ "_id" : ObjectId("59cdba583fc8107a74a90110"), "name" : "admin", "des" : "super" }

=》删除文档

db.集合.remove(条件,是否只删除一条默认为false) 删除指定条件的数据

> db.roleList.remove({name:'admin'})
WriteResult({ "nRemoved" : 2 })
> db.roleList.find()
{ "_id" : ObjectId("59cdb8503fc8107a74a9010f"), "name" : "dba" }

=》

查询文档

格式化json查询显示（pretty函数）

> db.roleList.save({ "_id" : ObjectId("59cdb8503fc8107a74a9010f"), "name" : "dba" ,des:'hello',userList:['zs','ls']})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.roleList.find().pretty()
{
        "_id" : ObjectId("59cdb8503fc8107a74a9010f"),
        "name" : "dba",
        "des" : "hello",
        "userList" : [
                "zs",
                "ls"
        ]
}

查询使用find（查询条件）,隔开的条件就是and 可以使用 $or表示拼接的 or的条件

> db.myRoleList.save({ "name" : "dba" ,des:'hello',userList:['zs','ls'],createtime:'2017-06-18',usedCount:10})
> db.myRoleList.insert({ "name" : "admin" ,des:'yeah',userList:['ww','zl'],createtime:'2017-07-18',usedCount:5})
> db.myRoleList.find({usedCount:{$gt:2},name:'dba'}) 等价于sql usedCount>2 and name='dba'
{ "_id" : ObjectId("59cdbf913fc8107a74a90111"), "name" : "dba", "des" : "hello", "userList" : [ "zs", "ls" ], "createtime" : "2017-06-18", "usedCount" : 10 }

> db.myRoleList.find({usedCount:{$gt:2},$or:[{name:'dba'},{name:'admin'}]}) 等价sql userdCount>2 and (name='dba' or name='admin')
{ "_id" : ObjectId("59cdbf913fc8107a74a90111"), "name" : "dba", "des" : "hello", "userList" : [ "zs", "ls" ], "createtime" : "2017-06-18", "usedCount" : 10 }
{ "_id" : ObjectId("59cdbf983fc8107a74a90112"), "name" : "admin", "des" : "yeah", "userList" : [ "ww", "zl" ], "createtime" : "2017-07-18", "usedCount" : 5 }

比较符号查看（摘自 http://www.runoob.com/mongodb/mongodb-operators-type.html）

操作	格式
等于	{<key>:<value>}
小于	{<key>:{$lt:<value>}}
小于或等于	{<key>:{$lte:<value>}}
大于	{<key>:{$gt:<value>}}
大于或等于	{<key>:{$gte:<value>}}
不等于	{<key>:{$ne:<value>}}

可以指定使用数据类型$type来进行判断

> db.myRoleList.find({usedCount:{$type:1}})
{ "_id" : ObjectId("59cdbf913fc8107a74a90111"), "name" : "dba", "des" : "hello", "userList" : [ "zs", "ls" ], "createtime" : "2017-06-18", "usedCount" : 10 }
{ "_id" : ObjectId("59cdbf983fc8107a74a90112"), "name" : "admin", "des" : "yeah", "userList" : [ "ww", "zl" ], "createtime" : "2017-07-18", "usedCount" : 5 }

类型是使用数字来标识

类型	数字	备注
Double	1
String	2
Object	3
Array	4
Binary data	5
Undefined	6	已废弃。
Object id	7
Boolean	8
Date	9
Null	10
Regular Expression	11
JavaScript	13
Symbol	14
JavaScript (with scope)	15
32-bit integer	16
Timestamp	17
64-bit integer	18
Min key	255	Query with -1.
Max key	127

=》查询文档分页

使用skip跳过到指定位置索引从1 开始 skip(1) 从第二条开始读取

使用limit限制返回的条数

比如myroleList有 21条记录每页显示5条显示第二页从6条开始拿出5条

db.myrolelist.find().skip(5).limit(5)

三。mongodb主从和副本集和分片集群

1》主从复制

模拟环境

主 192.168.58.147

192.168.58.145

主从复制是是用于备份主的数据主用于提供主的数据备份一般是主负责提供修改服务从可以提供读服务分担主的压力

192.168.58.147 启动mongod服务

mongod --master

192.168.58.145 启动mongod服务

mongod --slave --source=192.168.58.147:27017

使用mongod --host 192.168.58.147

添加一个集合数据

使用mongod --host 192.168.58.145

发现能登陆不能查询 rs.slaveOk()表示可读

查看 147上添加的数据是否自动同步到 145上一般ok

副本集和分片集群参考下一篇文章

四。 mongodb java调用

package mongo;

import java.util.Random;

import org.bson.Document;
import org.junit.Test;

import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;

public class TestMongo {
	/**
	 * 获取mongodb的连接
	 * @return
	 */
	public static MongoClient getClient(){
		MongoClient mc=new MongoClient("192.168.58.150", 27017);
		return mc;
	}
	/**
	 * 创建集合并添加文档和document
	 */
	@Test
	public void createCollection(){
		MongoClient mc=getClient();
		MongoDatabase database=mc.getDatabase("mydb");
		MongoCollection<Document> mcd=database.getCollection("userInfo");
		for(int i=0;i<=100;i++){
			Document doc=new Document();
			doc.append("name", "ls"+i);
			doc.append("sex", i%2==0?"女":"男");
			doc.append("age", new Random().nextInt(100));
			mcd.insertOne(doc);
		}
	}
	/**
	 * 查找集合下所有文档 具体根据条件参考删除
	 */
	@Test
	public void findCollection(){
		MongoClient mc=getClient();
		MongoDatabase database=mc.getDatabase("mydb");
		MongoCollection<Document> mcd=database.getCollection("userInfo");
		FindIterable<Document> ft=mcd.find();
		MongoCursor<Document> mr=ft.iterator();
		while(mr.hasNext()){
			Document doc=mr.next();
			System.out.println(doc.get("name")+"--"+doc.get("sex"));
		}
	}
	/**
	 * 更新文档
	 * updateOne更新找到的所有结果集中的第一条
	 * updateMany是更新所有结果集
	 */
	@Test
	public void updateCollection(){
		MongoClient mc=getClient();
		MongoDatabase database=mc.getDatabase("mydb");
		MongoCollection<Document> mcd=database.getCollection("userInfo");
		
		Document doc=new Document();
		doc.append("sex","男");
		//只是找到所有sex=女  将sex改成男 其他字段不修改
		mcd.updateMany(Filters.eq("sex", "女"),new Document("$set",doc));
	}
	/**
	 * 根据条件删除
	 */
	@Test
	public void deleteCollection(){
		MongoClient mc=getClient();
		MongoDatabase database=mc.getDatabase("mydb");
		MongoCollection<Document> mcd=database.getCollection("userInfo");
		//删除满足条件找到的第一条记录
		mcd.deleteOne(Filters.eq("sex", "女"));
		//两个条件都满足的所有记录都删除
		mcd.deleteMany(Filters.and(Filters.eq("sex", "女"),Filters.eq("name", "ls")));
	}
}

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