在完成了mongodb集群的搭建工作之后，需要做的就是建立一个数据库，建立表，设置分片主键来初始化数据了！
在完成了mongodb集群的搭建工作之后（见 ），需要做的就是建立一个数据库，建立表，设置分片主键来初始化数据了！
（1）建立wlb数据库，设置分表wlb_orders
 d:/mongodb-win32-i386-1.8.0/cmd>cd d:/mongodb-win32-i386-1.8.0/bin
d:/mongodb-win32-i386-1.8.0/bin>call mongo.exe 127.0.0.1:50000
mongodb shell version: 1.8.0
connecting to: 127.0.0.1:50000/test
> use admin
switched to db admin
> printshardingstatus()
--- sharding status ---
  sharding version: { _id : 1, version : 3 }
  shards:
      {
        _id : shardseta,
        host : seta/127.0.0.1:10000,127.0.0.1:10001,127.0.0.1:10002
}
      {
        _id : shardsetb,
        host : setb/127.0.0.1:20000,127.0.0.1:20001,127.0.0.1:20002
}
      {
        _id : shardsetc,
        host : setc/127.0.0.1:30000,127.0.0.1:30001,127.0.0.1:30002
}
  databases:
        { _id : admin, partitioned : false, primary : config }
> use wlb //在wlb数据库不存在的情况下，，就会新建一个数据库
switched to db wlb
> db.createcollection('wlb_orders') //创建一个表wlb_orders
{ ok : 1 }
> use admin
switched to db admin
> db.runcommand({enablesharding:'wlb'}) //设置数据库可以分片
{ ok : 1 }
> db.runcommand({shardcollection:'wlb.wlb_orders',key:{order_id:1}})  //设置表的分区主键为order_id
{ collectionsharded : wlb.wlb_orders, ok : 1 }
> db.printshardingstatus() //查询数据库分片信息
--- sharding status ---
  sharding version: { _id : 1, version : 3 }
  shards:
      {
        _id : shardseta,
        host : seta/127.0.0.1:10000,127.0.0.1:10001,127.0.0.1:10002
}
      {
        _id : shardsetb,
        host : setb/127.0.0.1:20000,127.0.0.1:20001,127.0.0.1:20002
}
      {
        _id : shardsetc,
        host : setc/127.0.0.1:30000,127.0.0.1:30001,127.0.0.1:30002
}
  databases:
        { _id : admin, partitioned : false, primary : config }
        { _id : wlb, partitioned : true, primary : shardseta }
                wlb.wlb_orders chunks:
                                shardseta       1
                        { order_id : { $minkey : 1 } } -->> { order_id : { $maxkey : 1 } } on : shardseta { t : 1000, i : 0 }
>