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How does a public key verify a signature?
... add a digital signature to a document using his/her private key to essentially obtain a hash of the document, but what I do not understand is how the public key can be used to verify that signature.
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Select first row in each GROUP BY group?
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On Oracle 9.2+ (not 8i+ as originally stated), SQL Server 2005+, PostgreSQL 8.4+, DB2, Firebird 3.0+, Teradata, Sybase, Vertica:
WITH summary AS (
SELECT p.id,
p.customer,
p.total,
ROW_NUMBER() OVER(PARTITION BY p.cus...
Most efficient way to check for DBNull and then assign to a variable?
This question comes up occasionally, but I haven't seen a satisfactory answer.
15 Answers
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Disable XML validation in Eclipse
...o have changed in newer versions of Eclipse - at least my Eclipse Mars installation doesn't have an "XML Schema Validator" entry. Instead, the context menu of the project lists every validation under "validation", as described in the answer of kevinarpe.
– Stephan Rauh
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Case insensitive 'in'
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Prefer to lower all keys when building the dict, for performance reasons.
– Ryan
May 1 '13 at 6:27
1
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Eclipse count lines of code
I've tried the Metrics plugin and although it's nice and all, it's not what my boss is looking for. It counts a line with just one } as a line and he doesn't want that to count as "its not a line, its a style choice". I also need to generate some form of report about the metrics provided. Are th...
How do I make my GUI behave well when Windows font scaling is greater than 100%
...vides caveats and cautions against assuming DPI-awareness is easy.
I generally avoid DPI-aware scaling with TForm.Scaled = True. DPI awareness is only important to me when it becomes important to customers who call me and are willing to pay for it. The technical reason behind that point of view i...
Force update of an Android app when a new version is available
...n forceUpgrade
boolean recommendUpgrade
When your app starts, you could call this API that pass in the current app version, and check the response of the versioning API call.
If forceUpgrade is true, show a popup dialog with options to either let user quit the app, or go to Google Play Store to ...
Is JavaScript an untyped language?
I've found that some people call JavaScript a "dynamically, weakly typed" language, but some even say "untyped"? Which is it really?
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How do browser cookie domains work?
...e's domain attribute is set,
the cookie is applicable to that domain and all its subdomains;
the cookie's domain must be the same as, or a parent of, the origin domain
the cookie's domain must not be a TLD, a public suffix, or a parent of a public suffix.
It can be derived that a cookie is alwa...