>show dbs 
##看到有如下数据 
admin (empty) 
comment 0.203125GB 
dbtest (empty) 
foo 0.203125GB 
local (empty) 
test 0.203125GB 
>use admin 
switched to db admin 
> db.addUser('admin','12345678') ##添加用户 
Mon Nov 5 23:40:00 [FileAllocator] allocating new datafile /data/db/admin.ns, filling with zeroes... 
{ 
 "user" : "admin", 
 "readOnly" : false, 
 "pwd" : "89e41c6c28d88d42c21fe501d82969ea", 
 "_id" : ObjectId("5097ddd00342c63efff3fbfb") 
} 
##之后运行 
>showdbs 
Mon Nov 5 23:45:13 uncaught exception: listDatabases failed:{ "errmsg" : "need to login", "ok" : 0 } ##提示需要登录 
 
添加--auth 启动 
./mongod -auth 
./mongo 
 
>use admin 
switched to db admin 
> db.auth('admin','12345678') ##用添加的账户密码查看 
Mon Nov 5 23:49:32 [conn56] authenticate db: admin { authenticate: 1, nonce: "304f5242601fafa4", user: "admin", key: "58260df384b1146466efca5c90a5ff05" } 
1 
#1 说明登录成功 
> show dbs 
admin 0.203125GB 
comment 0.203125GB 
dbtest (empty) 
foo 0.203125GB 
local (empty) 
test 0.203125GB 
> use admin 
switched to db admin 
> show collections; 
system.indexes 
system.users 
> db.system.users.find() ##查找数据 
{ "_id" : ObjectId("5097ddd00342c63efff3fbfb"), "user" : "admin", "readOnly" : false, "pwd" : "89e41c6c28d88d42c21fe501d82969ea" } 

<"mongodb://admin:12345678@192.168.138.35:27017"); 
/*选择melon数据库*/ 
$db = $m->melon; 
/*集合*/ 
$collection = melonco; 
/*选择数据库里面的集合，相当于表*/ 
$collection = $db->$collection; 
$array = array('name'=>'melon','age'=>'24','sex'=>'Male','birth'=>array('year'=>'1988','month'=>'07','day'=>'13')); 
$collection->insert($array); 
$cursor = $collection->find(); 
foreach ($cursor as $id => $value) { 
 echo "$id: "; var_dump($value); echo "<br>";  
} 
 
 
###2 使用数据库用户 
/*mongodb连接*/ 
$m = new Mongo("192.168.138.35:27017"); 
/*选择comment*/ 
$db = $m->melon; 
/*连接数据库*/ 
$db->authenticate("melon", "melon"); 
/*选择t数据库里面集合，相当于表*/ 
$collection = $db->melonco; 
$array = array('name'=>'melon_son','age'=>'0','sex'=>'Male','birth'=>array('year'=>'201X','month'=>'07','day'=>'13')); 
$collection->insert($array); 
$cursor = $collection->find(); 
 
foreach ($cursor as $id => $value) { 
 echo "$id: "; var_dump($value); echo "<br>";  
} 

> use admin 
switched to db admin 
> var schema = db.system.version.findOne({"_id" : "authSchema"}) 
> schema.currentVersion = 3 
3 
> db.system.version.save(schema) 
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }) 

> use admin 
> db.auth('root','123456')
> db.system.users.find()
{ "_id" : "admin.root", "user" : "root", "db" : "admin", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "XoI5LXvuqvxhlmuY6qkJIw==", "storedKey" : "VAT7ZVMw2kFDepQQ6/E0ZGA5UgM=", "serverKey" : "TebHOXdmY6IHzEE1rW1Onwowuy8=" } }, "roles" : [ { "role" : "userAdminAnyDatabase", "db" : "admin" } ] }
{ "_id" : "mydb.test", "user" : "test", "db" : "mydb", "credentials" : { "MONGODB-CR" : "c8ef9e7ab00406e84cfa807ec082f59e" }, "roles" : [ { "role" : "readWrite", "db" : "mydb" } ] }

> db.system.users.remove({user:"test"});
> use mydb 
>db.createUser({user:'test',pwd:'123456',roles:[{role:'readWrite',db:'mydb'}]}) 

<"mongodb://test:12345678@localhost:27017/mydb"); 
/*选择melon数据库*/ 
$db = $m->mydb; 
/*选择数据库里面的集合stu，相当于表*/ 
$collection = $db->stu; 
$array = array('name'=>'melon','age'=>'24','sex'=>'Male','birth'=>array('year'=>'1988','month'=>'07','day'=>'13')); 
$collection->insert($array); 
$cursor = $collection->find(); 
foreach ($cursor as $id => $value) { 
 echo "$id: "; var_dump($value); echo "<br>";  
}