php 如何在php中查询mongo？
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How to query mongo in php?
提问by michael
So I've got this simple login function that is trying to match email address with a password in the database and compare it with the user entered data via form.
所以我有这个简单的登录功能，它试图将电子邮件地址与数据库中的密码进行匹配，并将其与用户通过表单输入的数据进行比较。
function login($email, $password){
$m = new Mongo("localhost");
$m->connect();
$db = $m->users;
$collection = $db->test_collection;
echo "<pre>";
var_dump($collection->findOne(array('name' => 'john'))); //returns correctly
var_dump($collection->find(array('name' => 'john'))); //returns mongo cursor object
echo "</pre>";
}
I don't understand why the find() only returns a cursor object. Answers?
我不明白为什么 find() 只返回一个游标对象。答案？
This is the mongo document
这是mongo文档
array(5) {
["_id"]=>
object(MongoId)#22 (1) {
["$id"]=>"4d7eaa848baf84d32b000000"
}
["activated"]=> (true)
["email"]=> "[email protected]"
["name"]=> "john"
["password"]=> "334c4a4c42fdb79d7ebc3e73b517e6f8"
}
How would I do a "WHERE" query that would find both email and password in the same document? I'm obviously not getting the paramaters correct for the find() and findOne() queries. What is the correct syntax in PHP?
我将如何执行“WHERE”查询以在同一文档中同时找到电子邮件和密码？对于 find() 和 findOne() 查询，我显然没有得到正确的参数。PHP 中的正确语法是什么？
采纳答案by svjson
findis supposed to return a cursor - you can read more about them here: http://www.mongodb.org/display/DOCS/Queries+and+Cursors.
To get the documents from the cursor, you will have to iterate over it.
find应该返回一个游标 - 你可以在这里阅读更多关于它们的信息：http: //www.mongodb.org/display/DOCS/Queries+and+Cursors。要从游标中获取文档，您必须对其进行迭代。
In your case, findOneis probably what you are after since you don't expect multiple users with the same username and password. The findOne function always returns at most one document, so there is no need for a cursor.
在您的情况下，findOne可能是您所追求的，因为您不希望多个用户使用相同的用户名和密码。findOne 函数始终最多返回一个文档，因此不需要游标。
To have multiple predicates in your queries, just add more fields to your query array:
要在查询中包含多个谓词，只需向查询数组中添加更多字段：
var_dump($collection->findOne(array('name' => 'john', 'password' => '334c4a4c42fdb79d7ebc3e73b517e6f8')));
(If that is correct PHP - my PHP is a bit rusty)
（如果这是正确的 PHP - 我的 PHP 有点生疏）
回答by Osin Toumani
try
尝试
return count($collection->find(array('name' => $name, 'password' => $password)));
