mongodb 学习

1.基本命令

mongodb启动

help;
db.help();
show tables;
mkdir -p /home/db
mongod –port 11111 –dbpath E:\data\mongodb

> use foobar 
> db
> post = {"title":"my blog post","content":"here is my bolg post","date":"new Date"}
> db.blog.insert(post);
> db.blog.find();
> db.blog.findOne();//查找一条数据
> post.comments = []
> db.blog.update({title:"my blog post"},post) //自动显示最多20个匹配的文档
> db.blog.remove({"title":"my blog post"});

2.mapreduce学习

QueryBuilder query = QueryBuilder.start("pin").notEquals(pin)
				     						 .and("sku").in(skus)
							                 .and("updateDate").greaterThan(DateUtil.format(beginTime,DateUtil.YYYYMMDD_HHMMSS))
							                 .and("updateDate").lessThanEquals(DateUtil.format(endTime,DateUtil.YYYYMMDD_HHMMSS));
        String map =  "function(){emit(this.pin,{sku:this.sku,count:1})}";
        String reduce = "function(key,vals) {                                 "+
        " var array = [];                                                     "+
        "for(var i  in vals ){                                                "+
        "    var flag = false;                                                "+
        "    for(var j in array){                                             "+
    	"	   if(vals[i].sku==array[j]){                                     "+
    	"		  flag=true;                                                  "+
    	"	   }                                                              "+
    	"	 }                                                                "+
    	"	 if(!flag){                                                       "+
    	"      array.push(vals[i].sku);                                       "+
    	"    }	                                                              "+
    	" }                                                                   "+
    	" return array.length;                                                "+
    	"}                                                                    ";

		MapReduceOutput mp1 = userOrderClient.getCollection().mapReduce(map, reduce,null, MapReduceCommand.OutputType.INLINE, query.get());

		//转为map，排序,截取，保存
		Map<String,Integer> result = new HashMap<String,Integer>();
		Iterator<DBObject> it=    mp1.results().iterator();
		while(it.hasNext()){
          DBObject obj=    it.next();
          String str = obj.get("value").toString();
          int value =1;
          try{
        	  value = Integer.parseInt(str.substring(0, str.length()-2));
          }catch(NumberFormatException e){}
          result.put(obj.get("_id").toString(), value);
		}

3.新建集群库/表
先切到admin库下
库：

db.runCommand({"enablesharding":"UserProfile"})

表：

db.runCommand({shardcollection:'UserProfile.User_Temporary',key:{_id:1},unique:true})

删除库

user xxx
db.runCommand({"dropDatabase": 1});

4.master/slave配置，且设置认证
[i]slave/10.10.242.195[/i]

rm -rf /root/mongodb_slave_data
mkdir -p /root/mongodb_slave_data
./mongod --slave --source 10.10.242.196:6688  --port 6689 --dbpath /root/mongodb_slave_data   --maxConns 80000      #不加认证
use local 
db.addUser('repl','repl');
./mongod --slave --source 10.10.242.196:6688  --port 6689 --dbpath /root/mongodb_slave_data  --maxConns 80000  --auth #添加认证

[i]master/10.10.242.196[/i]

master/10.10.242.196
rm -rf /root/mongodb_data
mkdir -p /root/mongodb_data
./mongod --master --dbpath /root/mongodb_data    --port 6688 --maxConns 80000 
use local 
db.addUser('repl','repl');
./mongod --master --dbpath /root/mongodb_data  --port 6688 --maxConns 80000  -auth
use admin
db.addUser('admin','admin');

为test添加密码
use admin
db.auth('admin','admin');
db.addUser('test','test');

5.MonogoDB Sharding + Replica Set配置集群

195
mkdir -p /usr/MonogoData/shard1_10001
mkdir -p /usr/MonogoData/shard1_10011
./mongod --shardsvr --replSet shard1 --port 10001 --dbpath /usr/MonogoData/shard1_10001/ --logpath /usr/MonogoData/shard1_10001/log.log --rest --directoryperdb --maxConns 2000 --fork &
./mongod --shardsvr --replSet shard1 --port 10011 --dbpath /usr/MonogoData/shard1_10011/ --logpath /usr/MonogoData/shard1_10011/log.log --rest --directoryperdb --maxConns 2000 --fork &
./mongo --port 10001
use admin
config={_id:'shard1',members:[{_id:0,host:'10.10.249.195:10001'},{_id:1,host:'10.10.249.195:10011'}]}
rs.initiate(config)
rs.status() 

196
mkdir -p /usr/MonogoData/shard1_10001
mkdir -p /usr/MonogoData/shard1_10011
./mongod --shardsvr --replSet shard2 --port 10001 --dbpath /usr/MonogoData/shard1_10001/ --logpath /usr/MonogoData/shard1_10001/log.log --rest --directoryperdb --maxConns 2000 --fork &
./mongod --shardsvr --replSet shard2 --port 10011 --dbpath /usr/MonogoData/shard1_10011/ --logpath /usr/MonogoData/shard1_10011/log.log --rest --directoryperdb --maxConns 2000 --fork &
./mongo --port 10001
use admin
config={_id:'shard2',members:[{_id:0,host:'10.10.249.196:10001'},{_id:1,host:'10.10.249.196:10011'}]}
rs.initiate(config)
rs.status() 

197
mkdir -p /usr/MonogoData/shard1_10001
mkdir -p /usr/MonogoData/shard1_10011
./mongod --shardsvr --replSet shard3 --port 10001 --dbpath /usr/MonogoData/shard1_10001/ --logpath /usr/MonogoData/shard1_10001/log.log --rest --directoryperdb --maxConns 2000 --fork &
./mongod --shardsvr --replSet shard3 --port 10011 --dbpath /usr/MonogoData/shard1_10011/ --logpath /usr/MonogoData/shard1_10011/log.log --rest --directoryperdb --maxConns 2000 --fork &
./mongo --port 10001
use admin
config={_id:'shard3',members:[{_id:0,host:'10.10.249.196:10001'},{_id:1,host:'10.10.249.196:10011'}]}
rs.initiate(config)
rs.status()

这样，shard就配置好了。

现在开始配置1台Mongodb Config
mkdir -p /usr/MonogoData/Config_20001
./mongod  --configsvr --port 20001 --dbpath /usr/MonogoData/Config_20001/ --logpath /usr/MonogoData/Config_20001/log.log --rest --fork &

$ ps aux | grep mongodb | grep -v grep
查看是否mongodb的进程都起来了

下面接着配置Mongs
mkdir -p /usr/MonogoData/master
./mongos --port 40000 --logpath /usr/MonogoData/master/log.log  --chunkSize 1 --configdb 10.10.249.195:20001 --fork  &

./mongo --port 40000

use admin

db.runCommand({ addshard:'shard1/10.10.249.195:10001,10.10.249.195:10011' }) 
db.runCommand({ addshard:'shard2/10.10.249.196:10001,10.10.249.196:10011' })
db.runCommand({ addshard:'shard3/10.10.249.197:10001,10.10.249.197:10011' })
db.runCommand({listshards:1})

接下来进行切片
db.runCommand({ enablesharding:'liaoyongdb' })  #指定切片数据库
db.runCommand({shardcollection:'liaoyongdb.test',key:{_id:1}})   #指定切片数据的表
printShardingStatus()

删除索引

db.runCommand({'dropIndexes':"BrowseFinalBuy",'index':'wid_1_rwid_1'});

[b]6.集群修改ip后，无法正常启动[/b]

sharding模式直接修改admin库里某个表ip即可
Replica Sets则修改local库中某个表ip即可

[b]7.聚合函数学习[/b]

db.liguojun.aggregate({$match:{"key":"苹果"}},{$group:{"_id":"$sku","total":{$sum:"$count"}}});

where 为 key = 苹果，按sku分组，求count的和，注意：_id 不可更改，只能为_id