为什么我无法在mongodb中找到_id的记录 [英] Why am I unable to find a record by _id in mongodb
问题描述
$ recID =010101010101011; //是一个有效的mongodb _id
$ recID = new MongoId((string)$ recID); (字符串)强制转换
$ cursor = $ this-> Collection-> findOne(array('_ id'=> $ recID));
print_r($ cursor);
输出:
MongoCursor(
)
b
$ b
我已经通过将上面的_id更改为不同的字段(例如firstName)并传递了名字来验证其他所有工作,并返回有效的数据。
为什么这不起作用?
我甚至尝试用$ recID搜索字符串,没有区别。 >
下面是从mongo shell发生的事情(尽管我不确定我是否正确查询):
>
> db.Employee.find({login:myperson})
{_explicitType:project.Employee,_id:ObjectId(4e209564203d83940f0000
06),active:true ,addedDate:07/15/2011 15:29:21,domain:xxx,
id:ObjectId(4e209564203d83940f000006),lastLogin:07/20 / 2011 19:13:36
,login:myperson,name:我的人,pw:,ulevel:9999
}
> db.Employee.find({id:4e209564203d83940f000006})
> db.Employee.find({_ id:4e209564203d83940f000006})
>
注意没有返回id或_id。解决方案试试 db.Employee.find({_ id:ObjectId(4e209564203d83940f000006)}
I am trying to find a record in mongoDB by it's MongoID "_id" field. I have found examples on how to do it, but can not get it to work. Example:
$recID = "010101010101011"; //would be a valid mongodb _id
$recID = new MongoId((string)$recID); // I have tried it without the (string) cast too
$cursor = $this->Collection->findOne(array('_id' => $recID));
print_r($cursor);
It outputs:
MongoCursor (
)
Nothing inside.
I have verified everything else is working by changing the "_id" above to a different field such as "firstName" and passing in a first name and I get back valid data.
Why does this not work?
I have even tried searching with $recID as a string, no difference.
Here is what happens from the mongo shell (though I am not sure if I am querying properly):
>
> db.Employee.find({login:"myperson"})
{ "_explicitType" : "project.Employee", "_id" : ObjectId("4e209564203d83940f0000
06"), "active" : true, "addedDate" : "07/15/2011 15:29:21", "domain" : "xxx",
"id" : ObjectId("4e209564203d83940f000006"), "lastLogin" : "07/20/2011 19:13:36
", "login" : "myperson", "name" : "My Person", "pw" : "", "ulevel" : 9999
}
> db.Employee.find({id:"4e209564203d83940f000006"})
> db.Employee.find({_id:"4e209564203d83940f000006"})
>
Notice nothing returned for id or _id.
Try db.Employee.find({_id:ObjectId("4e209564203d83940f000006")}
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