PHP 从 MongoDb 中查询数据怎么样实现

一、软件环境(版本非必须) php v5.6 扩展:MongoDB nginx v1.11 mongodb v3.2

note: 必须安装MongoDB扩展

二、连接 $client = new MongoClient($server, $option);

$server 变量是个字符串,描述要连接的服务器

mongodb://[username:password@]host1[:port1][,host2[:port2:],...]/db

其中必要的是:

username 数据库用户名 password 数据库密码 host 服务器地址 port 数据库监听端口 三、选表(集合) 选择数据库 选择集合 $db = $client->{$db_name};

返回MongoDB类 类文档传送门

$collection = $db->{$collection_name};

返回MongoCollection类 类文档传送门

四、查询数据 $cursor = $collection->find($filter);

返回MongoCursor类 类文档传送门

1. $filter参数

mongoshell find函数参数使用:传送门

php代码编写

// 查询值大于value的文档 $filter[$gtKey] = array('$gt' => $value); // regexKey模糊查询 $filter[$regexKey] = new MongoRegex('/'.$regexValue.'/'); $collection->find($filter);

注意:

模糊查询需要使用MongoRegex类来使用,否则不识别 比较大小时,$value 的值需要与mongodb中存储的类型一致 2. 利用MongoCursor进行分页等操作 // 返回MongoCursor,可以利用MongoCursor的方法遍历数据 // 或者使用iterator_to_array($cursor)转换成数组 $cursor = $cursor ->sort(array($field=>'-1 or 1')) // 1是正序,-1是反序 ->skip($start) // 数据起始位置 ->limit($size); // 数据结束位置为$start+$size // 返回int型数值 $count = $cursor ->find($filter) ->count(); $data = iterator_to_array($cursor)

不再讲解如何使用MongoCursor遍历数据

五、总结

使用php连接MongoDB查询数据总体来说非常简单。连接、根据条件查询、分页,三步搞定。

注意事项:

使用单例模式获取MongoDB实例 模糊查询需要借助MongoRegex类 操作完成要** 关闭连接 **

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posted @ 2016-12-09 18:10  鼎峰Bruce  阅读(2915)  评论(0编辑  收藏  举报