Mongo Map Reduce 第一次

Ok, I've come up with something that I think may do what you want. Note, that this may not work exactly since I'm not 100% sure of your schema (considering your examples show refer available in type a, but not b (I'm not sure if that's an omission, or what considering you want to view by referer)... Anyway, here's what I've come up with:

地图功能:

function() {
    var obj = {
        "types": {},
        "tags": {},
    }
    obj.types[this.type] = 1;
    if (this.tags) {
        for (var tag in this.tags) {
            obj.tags[this.tags[tag]] = 1;
        }
    }
    emit(this.refer.url, obj);
}

Reduce 函数:

function(key, values) {
    var obj = {
        "types": {},
        "tags": {},
    }
    for (var i = 0; i < values.length; i++) {
        for (var type in values[i].types) {
            if (!type in obj.types) {
                obj.types[type] = 0;
            }
            obj.types[type] += values[i].types[type];
        }
        for (var tag in values[i].tags) {
            if (!tag in obj.tags) {
                obj.tags[tag] = 0;
            }
            obj.tags[tag] += values[i].tags[tag];
        }
    }
    return obj;
}

所以基本上，它的工作原理是这样的.Map 函数使用 refer.url 的键(我根据您的描述猜测).所以最终结果看起来像一个数组，其中 _id 等于 refer.url(它基于 url 分组).然后它创建一个对象，它下面有两个对象(类型和标签).对象的原因是 map 和 reduce 可以发出相同的格式对象.除此之外，我认为它应该是相对不言自明的(如果你不明白，我可以尝试解释更多)...

$mapFunc = new MongoCode($map);
$reduceFunc = new MongoCode($reduce);
$query = array(
    'time' => array('$gte' => time() - (60*60*60*24*30)),
    'refer.external' => true
);
$collection = 'visits';
$command = array(
    'mapreduce' => $collection,
    'map' => $mapFunc,
    'reduce' => $reduceFunc,
    'query' => $query,
);

$statsInfo = $db->command($command);

$statsCollection = $db->selectCollection($sales['result']);

$stats = $statsCollection->find();

foreach ($stats as $stat) {
    echo $stats['_id'] .' Visited ';
    foreach ($stats['value']['types'] as $type => $times) {
        echo "Type $type $times Times, ";
    }
    foreach ($stats['value']['tags'] as $tag => $times) {
        echo "Tag $tag $times Times, ";
    }
    echo "
";
}