Question

好的，不确定mongodb是否可以这样做，但我需要的是将以下JSON插入我的货币数据库。

我们要更新的部分是交换历史，我们需要保留当天汇率的所有历史记录。第二天，例如。

例如

{"from":"USD","currentexchange":[{"to":"NZD","rate":"1.3194","updated":"6\/5\/20121:38am"},{"to":"KWD","rate":"0.2807","updated":"6\/5\/20121:38am"},{"to":"GBP","rate":"0.6495","updated":"6\/5\/20121:38am"},{"to":"AUD","rate":"1.0228","updated":"6\/5\/20121:38am"}],"exchangehistory":{"6\/5\/2012":[{"1:38am":[{"to":"NZD","rate":"1.3194","updated":"1:38am"}]},{"1:38am":[{"to":"KWD","rate":"0.2807","updated":"1:38am"}]},{"1:38am":[{"to":"GBP","rate":"0.6495","updated":"1:38am"}]},{"1:38am":[{"to":"AUD","rate":"1.0228","updated":"1:38am"}]}]}}

Answer 1

我很可能不会将其存储在这样的数组中。我会创建一个平面数据结构：

{
    from: "USD",
    to: "EUR",
    updated: new DateTime("2012-05-04 13:43"),
    rate: 1.235,
},
{
    from: "USD",
    to: "EUR",
    updated: new DateTime("2012-05-06 13:43"),
    rate: 1.24,
},
{
    from: "USD",
    to: "AUD",
    updated: new DateTime("2012-05-06 13:43"),
    rate: 1.43,
}

这在数据库上要轻得多，因为文档永远不会增长。如果文件增长，他们必须被移动。您还可以非常轻松地查询当前的费率：

$collection->find( array( 'from' => 'USD', 'to' => 'EUR' ) )
           ->sort( 'updated' => -1 )->limit( 1 );

访问所有历史信息：

$collection->find( array( 'from' => 'USD', 'to' => 'EUR' ) )
           ->sort( 'updated' => -1 )->skip( 1 );

Answer 2

这不适用于PHP，但它可能很有用。你必须从你的json字符串中创建一个BSON对象才能存储在数据库中。 Creating BSON from JSON 您也可以使用MongoDB PHP驱动程序教程和文档。他们可以在这里找到：MongoDB PHP Driver Tutorial

MongoDB PHP插入子数组

2 个答案: