大约有 30,000 项符合查询结果（耗时：0.0281秒） [XML]
“Keep Me Logged In” - the best approach
...ll, let's do some math here. We're generating a 128 bit random token. That means that there are:
possibilities = 2^128
possibilities = 3.4 * 10^38
Now, to show how absurdly large that number is, let's imagine every server on the internet (let's say 50,000,000 today) trying to brute-force that num...
Is there a way to access the “previous row” value in a SELECT statement?
...ilt in notion of order, so you need to order by some column for this to be meaningful. Something like this:
select t1.value - t2.value from table t1, table t2
where t1.primaryKey = t2.primaryKey - 1
If you know how to order things but not how to get the previous value given the current one (EG, ...
Unsigned keyword in C++
...ese type modifiers is used by itself, a data type of int is assumed
This means that you can assume the author is using ints.
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Java Naming Convention with Acronyms [closed]
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Another good example is HTTPSID - did I mean HTTP SID or HTTPS ID... Therefore it should be written HttpSid or HttpsId respectively to better explain the meaning.
– Oz Edri
Feb 17 '16 at 8:33
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How do you perform a left outer join using linq extension methods
... old answer and was working at that time. Which Framework are you using? I mean .NET version?
– hajirazin
Oct 12 '16 at 5:25
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Python str vs unicode types
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unicode is meant to handle text. Text is a sequence of code points which may be bigger than a single byte. Text can be encoded in a specific encoding to represent the text as raw bytes(e.g. utf-8, latin-1...).
Note that unicode is not ...
MySQL, better to insert NULL or empty string?
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@Quassnoi ah sorry... I meant, why is it a bad practice to set driving number licence as unique...?
– cedbeu
Jun 3 '16 at 11:20
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Which Java Collection should I use?
...dList uses more memory per element...ArrayList never releases memory. That means that if you have a list that sometimes grows to a huge size but usually is small then an ArrayList will give worse memory performance. The memory overhead of the List itself is usually (although not always) small compar...
Is there a JSON equivalent of XQuery/XPath?
...I can used to find an item in [0].objects where id = 3?
I'll assume this means: find all JSON objects under the specified key with id == 3, no matter where the object may be. A corresponding jq query would be:
.[0].objects | .. | objects | select(.id==3)
where "|" is the pipe-operator (as in c...
mongodb/mongoose findMany - find all documents with IDs listed in array
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The find function in mongoose is a full query to mongoDB. This means you can use the handy mongoDB $in clause, which works just like the SQL version of the same.
model.find({
'_id': { $in: [
mongoose.Types.ObjectId('4ed3ede8844f0f351100000c'),
mongoose.Types.ObjectId...