这里是 MongoDB Map Reduce 的新手...但是找不到任何关于这里出了什么问题的文档。无论如何 - 这是一个示例文档:
数组 ( [_id] => MongoId 对象 ( [$id] => 5076e95791fa5e4c69002ec3 )
[dataProviders] => Array
(
[0] => Array
(
[key] => facebook
[data] => Array
(
[id] => 100001583260053
[name] => MyName
[link] => http://www.facebook.com/Mynameagain
[username] => MyName
[birthday] => 02/19/1959
[hometown] => Array
(
[id] => 104022969633581
[name] => MyName
)
[location] => Array
(
[id] => 104022969633581
[name] => MyHome
)
[bio] => MyBio
[work] => Array
(
[0] => Array
(
[employer] => Array
(
[id] => 119738361373063
[name] => .....
)
[start_date] => 0000-00
[end_date] => 0000-00
)
)
[education] => Array
(
[0] => Array
(
[school] => Array
(
[id] => 108891959147272
[name] => ....
)
[type] => High School
)
[1] => Array
(
[school] => Array
(
[id] => 133940149955590
[name] => .....
)
[type] => College
)
)
[gender] => female
[email] => MyEmail@myemail.com
[timezone] => 2
[locale] => US
[languages] => Array
(
[0] => Array
(
[id] => 106412222728952
[name] => MyName
)
)
[verified] => 1
[updated_time] => 2012-08-10T17:33:16+0000
[avatarUrl] => https://graph.facebook.com/1000/picture
[avatarUrlOriginal] => https://graph.facebook.com/1000/picture?type=large
[avatarUrlLarge] => https://graph.facebook.com/1000/picture
)
)
)
我的问题是，我正在尝试运行一个基本的 MapReduce，以仅从该组中拉取 Facebook 用户。基本上我想做一个非常简单的计数。据我所知，这应该有效，但我收到一条错误消息:
error_reporting(E_ALL);
ini_set('display_errors', '1');
include "phpmapreduce/lib/MongoMapReduce.php";
include "phpmapreduce/lib/MongoMapReduceResponse.php";
include "phpmapreduce/lib/XMongoCollection.php";
$collection_name = "users";
$map = "function(){emit({source: this.dataProviders.0.key}, {count: 1}); }}";
$reduce = "function(key, values){
var sum= {count: []};
for(var i in values)
sum += values[i];
return sum;
}";
$query = array('dataProviders.0.key' => 'facebook');
echo "Here's our map Function! <br/>";
$mapFunc = new MongoCode($map);
echo "<pre>";
print_r($mapFunc);
$reduceFunc = new MongoCode($reduce);
print_r($reduceFunc);
$command= array(
"mapreduce"=>'texasHoldem.users',
"map"=>$mapFunc,
"reduce"=>$reduceFunc,
"query" =>$query,
"out" => array(
"inline" => 1)
);
try {
$mongo = new Mongo('mongodb://1.2.3.4.5.6.7./mydb', array("replicaSet" => true));
}
catch(MongoConnectionException $e) {
$msg = "Error Connecting to MongoDB" . "<br/>";
die($msg);
}
echo "Connected" . "<br/>";
$db = $mongo->selectDb('yallapop');
echo "got mydb!" . "<br/>";
$db->setSlaveOkay(); // This line is needed to be able to read from slave
$collection= $db->selectCollection('texasHoldem.users'); // Users collection
echo "Got the Collection" . "<br/>";
echo "setting timeout" . "<br/>";
//$cursor = $collection->find()->timeout(30000);
MongoCursor::$timeout = -1;
echo "<pre>";
echo "let's do this! Running command" . "<br/>";
$statsInfo = $db->command($command);
print_r($statsInfo);
SO this works well up to this point:
Connected
got myDB!
data established
setting timeout
Got the Collection
setting timeout
let's do this! Running command
Array
(
[errmsg] => exception: couldn't compile code for: _map
[code] => 13598
[ok] => 0
)
我在任何地方都找不到关于这个特定错误的任何信息。 _map 函数无法编译。以前没见过这个。还有谁有经验吗？它使用 MongoDB 和 PHP 5.3。谢谢!
最佳答案
看起来你的代码中有几个语法错误，这就是它无法编译的原因。
在你的 map 函数中，你有太多的右花括号，而且 emit 键也不应该是一个文档。
$map = "function() {
emit( this.dataProviders.0.key, {count: 1});
}";
在reduce函数中，如果只是求和，sum中不需要数组。只是做:
$reduce = "function(key, values) {
var sum = {count: 0};
for (var i in values) {
sum.count += values[i].count;
}
return sum;
}";
尝试一下是否适合您。
关于php - MongoDB，errmsg，异常 : couldn't compile code for: _map, PHP，命令，MapReduce，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13039744/