使用phpmongodb扩展时比较需要注意的事项

最近在使用php的mongo 扩展进行数据统计计算,其中有一个时间戳字段,由于精确到了毫秒,长度有13位,但由于开始的时候是以字符串的形式存储:

代码如下

{ “_id” : objectid(“504eea97e4b023cf38e34039”), “in_ts” : numberlong(“1347349143699”), “log” : { “guid” : “4d1f3079-7507-f4b0-e7af-5432d5d8229d”, “p” : “view_prop_yeppage_zheng”, “cid” : “11”, “url” : “http://shanghai.haozu.com/rental/broker/n/10481780”, “rfpn” : “listing_v2_indexpage_all”, “site” : “haozu”, “agent” : “mozilla/4.0 (compatible; msie 6.0; windows nt 5.1; sv1)”, “stamp” : “1347349162159”, “cip” : “116.226.70.44”, “referer” : “http://shanghai.haozu.com/shop/1464934/”, “cstamp” : “1347349323125”, “sessid” : “fa798056-f9e7-f961-41e0-cc95c850fa47”, “uguid” : “c00ff55b-3d3d-4b31-4318-12345b0dbe64”, “pn” : “view_prop_yeppage_zheng”, “cstparam” : { “proid” : numberlong(10481780), “brokerid” : “326792”, “tradetype” : “2”, “usertype” : “0”, “channel” : “site”, “entry” : “1”, “commid” : “1666” } }, “out_ts” : numberlong(“1347349466083”), “rule” : 0, “status” : “ok”, “txid” : 0 }

后来改成数字格式:

代码如下

{ “_id” : objectid(“504eea97e4b023cf38e34039”), “in_ts” : numberlong(“1347349143699”), “log” : { “guid” : “4d1f3079-7507-f4b0-e7af-5432d5d8229d”, “p” : “view_prop_yeppage_zheng”, “cid” : “11”, “url” : “http://shanghai.haozu.com/rental/broker/n/10481780”, “rfpn” : “listing_v2_indexpage_all”, “site” : “haozu”, “agent” : “mozilla/4.0 (compatible; msie 6.0; windows nt 5.1; sv1)”, “stamp” : numberlong(“1347349162159”), “cip” : “116.226.70.44”, “referer” : “http://shanghai.haozu.com/shop/1464934/”, “cstamp” : “1347349323125”, “sessid” : “fa798056-f9e7-f961-41e0-cc95c850fa47”, “uguid” : “c00ff55b-3d3d-4b31-4318-12345b0dbe64”, “pn” : “view_prop_yeppage_zheng”, “cstparam” : { “proid” : numberlong(10481780), “brokerid” : “326792”, “tradetype” : “2”, “usertype” : “0”, “channel” : “site”, “entry” : “1”, “commid” : “1666” } }, “out_ts” : numberlong(“1347349466083”), “rule” : 0, “status” : “ok”, “txid” : 0 }为字符串时,使用下面的查询是正常的

$query = array (‘log.stamp’ => array (‘$gte’ => ‘1347346800000’, ‘$lt’ => ‘1347350400000’));

但是改为数字后,使用下面的查询,死活没有结果,但是直接在mongo客户端直接查询是有结果的:

代码如下

array (‘$gte’ => 1347346800000, ‘$lt’ => 1347350400000));

花了好大一会找原因,开始时怀疑是php扩展的bug导致,经过一番思考。突然想到可能是类型问题导致,发现手册上有types 介绍,所以正确的用法如下:

代码如下

$query = array (‘log.stamp’ => array (‘$gte’ => new mongoint64($time_range[‘start’]), ‘$lt’ => new mongoint64($time_range[‘end’])));

另外,在使用mapreduce进行数据统计时,为了防止cursor出现超时异常,还需要设置一下超时时间

代码如下

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