blocks|key|3899102|text|final+result+=+await+FirebaseFirestore.instance.doc('admin/6Ctki5kFhlcycvim7Mar').get();
final+hashResult+=+result.data()+as+Map<String,dynamic>;
final+password+=+hashResult['key'];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3899103|您可以使用上面的代码片段获取密码值。|unstyled|3899104|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>final result = await FirebaseFirestore.instance.doc('admin/6Ctki5kFhlcycvim7Mar').get();
final hashResult = result.data() as Map&lt;String,dynamic&gt;;
final password = hashResult['key'];
</code></pre>
You can get password value with the above code snippet.

blocks|key|2011121|text|具体步骤如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2011122|希望在执行以下步骤之前已经调用了Firebase.initializeApp();。下面的所有步骤都可以在单独的class或WidetNameState+extends+State<WidgetName>{}类中编写，您可以在该类中使用firestore数据。|offset|length|style|CODE|2011123|第1步：创建Firestore实例。|BOLD|2011124|FirebaseFirestore+_firestore+=+FirebaseFirestore.instance;|2011125|第2步：创建一个从集合中以列表形式获取所有文档的函数：|2011126|///This+function+Returns+the+Collection+Documents+as+a+List.
///
///+Parameter+[collection]+takes+the+name+of+the+collection+to+be+queried.
Future<List<QueryDocumentSnapshot>>+getCollectionDocumentsAsList(String+collection)+async+{
++++final+QuerySnapshot+data+=+await+_firestore.collection('$collection').get();
++++return+data.docs;
++}|code-block|syntax|javascript|2011127|第4步：检查每个文档中的“密钥”是否与您的“主密码”匹配：|2011128|///+pass+your+master+password+to+[masterPassword]
++void+checkPassword(String+masterPassword)async{
++++///+this+variable+will+contain+the+document+from+firestore+that+has+the+same+key+as+your+master+password.
++++DocumentSnapshot+passwordMatchDoc;
++++
++++//+admin+is+the+collection+name.
++++List<QueryDocumentSnapshot>+documents+=+await+getCollectionDocumentsAsList('admin');
++++
++++documents.forEach((DocumentSnapshot+doc){
++++++if+(doc["key"]+==+masterPassword){
++++++++passwordMatchDoc+=+doc;
++++++}
++++});
++}|2011129|在这里，当密码匹配时，您还可以使用for循环，而不是.forEach((d){})和break。或者在函数中声明变量，然后将具有与主密码相同的密码的文档存储在其中。|2011130|您可以在小部件类的initState(){}函数中调用checkPassword('masterPassword')。|2011131|2011132|小提示，因为firestore集合中的文档id看起来像是自动生成的，所以在应用程序执行时无法知道文档的实际id，因此您必须遍历所有文档，并使用密码检查每个文档的key字段。但是将来，如果你知道你想要的特定键的文档id，你可以使用下面的函数，它以DocumentSnapshot的形式返回文档中的所有字段，这将减少你的计算时间。|2011133|///+Returns+a+[DocumentSnapshot]+of+[document]+from+[collection]+specified.
++Future<DocumentSnapshot>+getCollectionDocument(String+collection,+String+document)+async+=>+await+_firestore.collection(collection).doc(document).get();|2011134|entityMap^0|0|G|P|1K|5|1Q|16|0|0|4|0|0|1M|0|0|4|0|0|0|4|0|0|H|3|Q|F|16|5|0|9|D|R|V|0|0|28|3|3E|G|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@$D|1A|E|1B|F|G]|$D|1C|E|1D|F|G]|$D|1E|E|1F|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1G|8|@$D|1H|E|1I|F|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|1J|8|@$D|1K|E|1L|F|G]]|9|@]|A|$]]|$1|M|3|N|5|6|7|1M|8|@$D|1N|E|1O|F|J]]|9|@]|A|$]]|$1|O|3|P|5|Q|7|1P|8|@]|9|@]|A|$R|S]]|$1|T|3|U|5|6|7|1Q|8|@$D|1R|E|1S|F|J]]|9|@]|A|$]]|$1|V|3|W|5|Q|7|1T|8|@]|9|@]|A|$R|S]]|$1|X|3|Y|5|6|7|1U|8|@$D|1V|E|1W|F|G]|$D|1X|E|1Y|F|G]|$D|1Z|E|20|F|G]]|9|@]|A|$]]|$1|Z|3|10|5|6|7|21|8|@$D|22|E|23|F|G]|$D|24|E|25|F|G]]|9|@]|A|$]]|$1|11|3|-4|5|6|7|26|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|27|8|@$D|28|E|29|F|G]|$D|2A|E|2B|F|G]]|9|@]|A|$]]|$1|14|3|15|5|Q|7|2C|8|@]|9|@]|A|$R|S]]|$1|16|3|-4|5|6|7|2D|8|@]|9|@]|A|$]]]|17|$]]

<h2>The steps are as follows:</h2>
hope <code>Firebase.initializeApp();</code> has been called before executing the below steps.
All the below steps can be written in a separate <code>class</code> or the <code>WidetNameState extends State&lt;WidgetName&gt;{}</code> class where you are using the firestore data.
Step 1: Create the Firestore instance.
<code>FirebaseFirestore _firestore = FirebaseFirestore.instance;</code>
Step 2: Creating a Function that gets all the documents as a list from the collection:
<pre><code>///This function Returns the Collection Documents as a List.
///
/// Parameter [collection] takes the name of the collection to be queried.
Future&lt;List&lt;QueryDocumentSnapshot&gt;&gt; getCollectionDocumentsAsList(String collection) async {
 final QuerySnapshot data = await _firestore.collection('$collection').get();
 return data.docs;
 }
</code></pre>
Step 4: Checking the &quot;key&quot; from each document matches your &quot;master password or not&quot;:
<pre><code>/// pass your master password to [masterPassword]
 void checkPassword(String masterPassword)async{
 /// this variable will contain the document from firestore that has the same key as your master password.
 DocumentSnapshot passwordMatchDoc;
 
 // admin is the collection name.
 List&lt;QueryDocumentSnapshot&gt; documents = await getCollectionDocumentsAsList('admin');
 
 documents.forEach((DocumentSnapshot doc){
 if (doc[&quot;key&quot;] == masterPassword){
 passwordMatchDoc = doc;
 }
 });
 }
</code></pre>
Here you can also use a <code>for</code> loop instead of <code>.forEach((d){})</code> and <code>break</code> when the password matches. Or declare the variable out of the function and then store the document that has the same password as the master password there.
you can call the <code>checkPassword('masterPassword')</code> in the <code>initState(){}</code> function of the widget class.
<hr />
A small tip, since the document id in the firestore collection looks like being auto-generated so at the time of app execution there is no way to know the actual id of the document, hence you would have to loop all over the documents and check for the <code>key</code> field of each document with your password.
But in future, if you know the document id of the particular key you want you can use the below function which returns all the fields in the document as a <code>DocumentSnapshot</code> and will reduce your compute time.
<pre><code>/// Returns a [DocumentSnapshot] of [document] from [collection] specified.
 Future&lt;DocumentSnapshot&gt; getCollectionDocument(String collection, String document) async =&gt; await _firestore.collection(collection).doc(document).get();
</code></pre>

how can i Get this single data &quot;key&quot; with out using strembuilder or futurebuilder...In flutter Using FireBase
I just wanna check if my master password == key
Any help??
<a href="https://i.stack.imgur.com/PlFJo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PlFJo.png" alt="enter image description here" /></a>

How to Get a Single Data Form Firebase With out Using strembuilder or futurebuilder In Flutter

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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我怎么才能得到这个单一的数据“密钥”没有使用strembuilder或futurebuilder...In flutter使用FireBase我只想检查一下我的主密码==密钥有任何帮助吗？​​

问如何在Flutter中不使用strembuilder或futurebuilder从Firebase中获取单个数据
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问如何在Flutter中不使用strembuilder或futurebuilder从Firebase中获取单个数据EN