dse55384
2014-06-10 13:57
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如何通过jenssegers将MongoDB聚合查询转换为Laravel MongoDB

I have MongoDB collection called changes which contains following data

{
    "date" : ISODate("2014-06-09T00:00:00.000Z"),
    "field" : "ip",
    "from" : "157.11.209.123",
    "to" : "107.21.109.254"
}
{
    "date" : ISODate("2014-05-15T00:00:00.000Z"),
    "field" : "ip",
    "from" : "107.21.109.254",
    "to" : "157.11.209.123"
}
{
    "date" : ISODate("2014-06-09T00:00:00.000Z"),
    "field" : "registration",
    "from" : "Old service",
    "to" : "Some new service"
}

Then I want to make typical SQL query that counts occurrences and group it by field. So, I've created query in MongoDB

db.changes.group({
    "key": {
        "field": true
    },
    "initial": {
        "count": 0,
    },
    "reduce": function(obj, prev) {
            prev.count++;
    },
});

It works fine but how can I convert it to works with Laravel 4? I am using jenssegers/laravel-mongodb to communicate with mongo server.

In addition, I have more conditions in query, which I've removed to make my question looks more clearly, so I'm looking for solution to convert exactly that query into laravel, not other possible solutions :).

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我有一个名为更改的MongoDB集合,其中包含以下数据 \ n

  {
“date”:ISODate(“2014-06-09T00:00:00.000Z”),
“field”:“ip”,
“from”:“157.11.209.123  “,
”到“:”107.21.109.254“
} 
 {
”date“:ISODate(”2014-05-15T00:00:00.000Z“),
”field“:”ip“  ,
“from”:“107.21.109.254”,
“to”:“157.11.209.123”
} 
 {
“date”:ISODate(“2014-06-09T00:00:00.000Z”  ),
“字段”:“注册”,
“从”:“旧服务”,
“到”:“一些新服务”
} 
   
 \  n 

然后我想制作典型的SQL查询来计算事件并通过 field 对其进行分组。 所以,我在MongoDB中创建了查询

  db.changes.group({
“key”:{
“field”:true 
},
  “initial”:{
“count”:0,
},
“reduce”:function(obj,prev){
 prev.count ++; 
},
}); 
   
 
 

它工作正常,但如何将其转换为与Laravel 4一起使用? 我正在使用jenssegers / laravel-mongodb与mongo服务器进行通信。

此外,我在查询中有更多条件,我已将其删除以使我的问题看起来更清晰,所以我正在寻找将该查询完全转换为laravel的解决方案,而不是 其他可能的解决方案:)。

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1条回答 默认 最新

  • douciping4283 2014-06-10 14:12
    已采纳

    You are both better off using the aggregation framework methods and also diving into the raw MongoDB collection object provided from the underlying driver to do so. It's a much better option that trying to translate the syntax:

    // Returns the original Mongo Result
    $result = DB::collection('changes')->raw(function($collection)
    {
        return $collection->aggregate(array(
            array(
                '$group' => array(
                    '_id' => '$field',
                    'count' => array(
                        '$sum' => 1
                    )
                )
            )   
        ));
    });
    

    The result is a little different from the result of a method like .group() but this uses native code on the MongoDB server and does not rely on JavaScript interpretation like the .group() method actually does, being really a wrapper around mapReduce.

    The end result is much faster, and also generally more efficient than you will get out of the native framework interface.

    So use the native MongoDB way for the best performance.

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