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Definition of “downstream” and “upstream”
...ct.
The DVCS (Distributed Version Control System) twist is: you have no idea what downstream actually is, beside your own repo relative to the remote repos you have declared.
you know what upstream is (the repos you are pulling from or pushing to)
you don't know what downstream is made of (the ...
What's so bad about Template Haskell?
...l, on the other hand, is just macros. It's not abstraction at the level of ideas, but abstraction at the level of ASTs, which is better, but only modestly, than abstraction at the level of plain text.*
It ties you to GHC. In theory another compiler could implement it, but in practice I doubt this wi...
How to use sessions in an ASP.NET MVC 4 application?
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Thanks Jobert! u gave me an idea! just wondering though.., it's is possible to add user variables to a session during login? and also will i have access to session variables (created only once) across different controllers in my application?
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How do you do Impersonation in .NET?
...ccess to that user account via a username and password, although these two ideas pair together frequently. I will describe them both, and then explain how to use my SimpleImpersonation library, which uses them internally.
Impersonation
The APIs for impersonation are provided in .NET via the Syste...
C state-machine design [closed]
...t that it never occurred to me to introduce 'wildcard' states. Interesting idea! However, iterating the array of transitions might become expensive if you have a lot of states (which was the case for me since the C code was automatically generated). In such situations, it would be more efficient to ...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...pd.id, followed by a bare INSERT INTO testtable SELECT * FROM newvals? My idea with this: instead of filtering twice in INSERT (for the JOIN/WHERE and for the unique constraint), reuse the existence check results from the UPDATE, which are in RAM already, and may be much smaller. This may be a win ...
Difference between DTO, VO, POJO, JavaBeans?
... introduced with EJB. Instead of performing many remote calls on EJBs, the idea was to encapsulate data in a value object that could be transfered over the network: a Data Transfer Object. Wikipedia has a decent definition of Data Transfer Object:
Data transfer object (DTO), formerly known as va...
Database development mistakes made by application developers [closed]
...egation (ie the GROUP BY clause) can be compared to joins.
To give you an idea of how widespread this is, I've written on this topic several times here and been downvoted a lot for it. For example:
From SQL statement - “join” vs “group by and having”:
First query:
SELECT userid
FROM ...
What does a Ajax call response like 'for (;;); { json data }' mean? [duplicate]
...tion with an attack on Gmail that was published by Jeremiah Grossman.
The idea is as simple as beautiful: A lot of users tend to be logged in permanently in Gmail or Facebook. So what you do is you set up a site and in your malicious site's Javascript you override the object or array constructor:
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In Django, how does one filter a QuerySet with dynamic field lookups?
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-1 calling eval() on user import is a bad idea, even if you trust your users completely. A JSON field would be a better idea here.
– John Carter
Sep 20 '17 at 2:59
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