【www.bbyears.com--MongoDB】
以下就是我在使用 Codeigniter 的 MongoDB 扩展时，添加的一个扩展
就是使用 MongoDB 的 Aggregate 实现 Mysql 中的 Sum 方法
/* Controller.php */
$option = array (
array (
"$match" => array (
"match_1" => "value_1",
"match_2" => "value_2"
)
),
array (
"$group" => array (
"_id" => null,
"sum_1" => ["$sum" => "$amount_1"],
"sum_2" => ["$sum" => "$amount_2"],
"sum_3" => ["$sum" => "$amount_3"]
)
)
);
$result = $this -> mongo_db -> aggregate("collection", $option);
/* Mongo_db.php */
public function aggregate ($collection, $option = array())
{
try {
return $this -> db -> {$collection} -> aggregate($option);
}
catch (Exception $e) {
show_error("Unable to aggregate Mongo Databases: {$e->getMessage()}", 500);
}
}