MongoCollection
PHP Manual

MongoCollection::aggregate

(PECL mongo >=1.3.0)

MongoCollection::aggregatePerform an aggregation using the aggregation framework

说明

public array MongoCollection::aggregate ( array $pipeline [, array $op [, array $... ]] )

The MongoDB » aggregation framework provides a means to calculate aggregated values without having to use MapReduce. While MapReduce is powerful, it is often more difficult than necessary for many simple aggregation tasks, such as totaling or averaging field values.

This method accepts either a variable amount of pipeline operators, or a single array of operators constituting the pipeline.

参数

pipeline

An array of pipeline operators, or just the first operator.

op

The second pipeline operator.

...

Additional pipeline operators.

返回值

The result of the aggregation as an array. The ok will be set to 1 on success, 0 on failure.

错误/异常

When an error occurs an array with the following keys will be returned:

范例

Example #1 MongoCollection::aggregate() example

The following example aggregation operation pivots data to create a set of author names grouped by tags applied to an article. Call the aggregation framework by issuing the following command:

<?php
$m 
= new Mongo;
$c $m->selectDB("examples")->selectCollection("article");
$data = array (
    
'title' => 'this is my title',
    
'author' => 'bob',
    
'posted' => new MongoDate,
    
'pageViews' => 5,
    
'tags' => array ( 'fun''good''fun' ),
    
'comments' => array (
      array (
        
'author' => 'joe',
        
'text' => 'this is cool',
      ),
      array (
        
'author' => 'sam',
        
'text' => 'this is bad',
      ),
    ),
    
'other' =>array (
      
'foo' => 5,
    ),
);
$d $c->insert($data, array("w" => 1));

$ops = array(
    array(
        
'$project' => array(
            
"author" => 1,
            
"tags"   => 1,
        )
    ),
    array(
'$unwind' => '$tags'),
    array(
        
'$group' => array(
            
"_id" => array("tags" => '$tags'),
            
"authors" => array('$addToSet' => '$author'),
        ),
    ),
);
$results $c->aggregate($ops);
var_dump($results);
?>

以上例程会输出:

array(2) {
  ["result"]=>
  array(2) {
    [0]=>
    array(2) {
      ["_id"]=>
      array(1) {
        ["tags"]=>
        string(4) "good"
      }
      ["authors"]=>
      array(1) {
        [0]=>
        string(3) "bob"
      }
    }
    [1]=>
    array(2) {
      ["_id"]=>
      array(1) {
        ["tags"]=>
        string(3) "fun"
      }
      ["authors"]=>
      array(1) {
        [0]=>
        string(3) "bob"
      }
    }
  }
  ["ok"]=>
  float(1)
}

The following examples use the » zipcode data set. Use mongoimport to load this data set into your mongod instance.

Example #2 MongoCollection::aggregate() example

To return all states with a population greater than 10 million, use the following aggregation operation:

<?php
$m 
= new Mongo;
$c $m->selectDB("test")->selectCollection("zips");

$out $c->aggregate(array(
        
'$group' => array(
            
'_id' => '$state',
           
'totalPop' => array('$sum' => '$pop')
        )
    ),
    array(
        
'$match' => array('totalPop' => array('$gte' => 10*1000*1000))
    )
);

var_dump($out);
?>

以上例程的输出类似于:

array(2) {
  ["result"]=>
  array(7) {
    [0]=>
    array(2) {
      ["_id"]=>
      string(2) "TX"
      ["totalPop"]=>
      int(16986510)
    }
    [1]=>
    array(2) {
      ["_id"]=>
      string(2) "PA"
      ["totalPop"]=>
      int(11881643)
    }
    [2]=>
    array(2) {
      ["_id"]=>
      string(2) "NY"
      ["totalPop"]=>
      int(17990455)
    }
    [3]=>
    array(2) {
      ["_id"]=>
      string(2) "IL"
      ["totalPop"]=>
      int(11430602)
    }
    [4]=>
    array(2) {
      ["_id"]=>
      string(2) "CA"
      ["totalPop"]=>
      int(29760021)
    }
    [5]=>
    array(2) {
      ["_id"]=>
      string(2) "OH"
      ["totalPop"]=>
      int(10847115)
    }
    [6]=>
    array(2) {
      ["_id"]=>
      string(2) "FL"
      ["totalPop"]=>
      int(12937926)
    }
  }
  ["ok"]=>
  float(1)
}

Example #3 MongoCollection::aggregate() example

To return the average populations for cities in each state, use the following aggregation operation:

<?php
$m 
= new Mongo;
$c $m->selectDB("test")->selectCollection("zips");

$out $c->aggregate(
    array(
        
'$group' => array(
            
'_id' => array('state' => '$state''city' => '$city' ),
            
'pop' => array('$sum' => '$pop' )
        )
    ),
    array(
        
'$group' => array(
            
'_id' => '$_id.state',
            
'avgCityPop' => array('$avg' => '$pop')
        )
    )
);

var_dump($out);

以上例程的输出类似于:

array(2) {
  ["result"]=>
  array(51) {
    [0]=>
    array(2) {
      ["_id"]=>
      string(2) "DC"
      ["avgCityPop"]=>
      float(303450)
    }
    [1]=>
    array(2) {
      ["_id"]=>
      string(2) "DE"
      ["avgCityPop"]=>
      float(14481.913043478)
    }
    [2]=>
    array(2) {
      ["_id"]=>
      string(2) "RI"
      ["avgCityPop"]=>
      float(18933.283018868)
    }
    [3]=>
    array(2) {
      ["_id"]=>
      string(2) "AL"
      ["avgCityPop"]=>
      float(7907.2152641879)
    }
    [4]=>
    array(2) {
      ["_id"]=>
      string(2) "NH"
      ["avgCityPop"]=>
      float(5232.320754717)
    }
...
    [45]=>
    array(2) {
      ["_id"]=>
      string(2) "WY"
      ["avgCityPop"]=>
      float(3359.9111111111)
    }
    [46]=>
    array(2) {
      ["_id"]=>
      string(2) "MN"
      ["avgCityPop"]=>
      float(5335.4865853659)
    }
    [47]=>
    array(2) {
      ["_id"]=>
      string(2) "OK"
      ["avgCityPop"]=>
      float(6155.7436399217)
    }
    [48]=>
    array(2) {
      ["_id"]=>
      string(2) "IL"
      ["avgCityPop"]=>
      float(9931.0182450043)
    }
    [49]=>
    array(2) {
      ["_id"]=>
      string(2) "WI"
      ["avgCityPop"]=>
      float(7323.0074850299)
    }
    [50]=>
    array(2) {
      ["_id"]=>
      string(2) "WV"
      ["avgCityPop"]=>
      float(2759.1953846154)
    }
  }
  ["ok"]=>
  float(1)
}

参见


MongoCollection
PHP Manual