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Transactions in .net
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Again Marc, another excellent explanation. When you say 'expected nesting is supported' is that for transaction blocks defined within the methods (CallAMethodThatDoesSomeWork() for example) themselves? Or with the transactionscope defined outsid...
Groovy: what's the purpose of “def” in “def x = 0”?
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Ted's answer is excellent for scripts; Ben's answer is standard for classes.
As Ben says, think of it as "Object" -- but it is much cooler in that it does not constrain you to the Object methods. This has neat implications with respect to ...
Django: How to completely uninstall a Django app?
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Excellent answer, just one addition that I'd make: pip uninstall package-name is your friend, much nicer than trawling around your PYTHONPATH.
– DaveJ
Jul 26 '10 at 12:23
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SQL query return data from multiple tables
...use a union query
Left and Right Outer Joins (this stackOverflow answer is excellent to describe types of joins)
Intersect queries (and how to reproduce them if your database doesn't support them) - this is a function of SQL-Server (see info) and part of the reason I wrote this whole thing in the fi...
Why can't I forward-declare a class in a namespace using double colons?
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There's a lot of excellent answers about the rationale involved in disallowing it. I just want to provide the boring standardese clause the specifically prohibits it. This holds true for C++17 (n4659).
The paragraph in question is [class.nam...
PDO's query vs execute
...only one function instead of two. The parameter binding operation provides excellent protection, but it might be expensive and possibly avoided if unnecessary.
Given a couple rare conditions:
If you can't reuse a prepared statement because it's not supported by the Microsoft ODBC driver.
If you'r...
Best ways to teach a beginner to program? [closed]
...rate loops, variables, functions, conditionals, etc. This page provides an excellent tutorial.
After Logo, move to Python or Ruby. I recommend Python, as it's based on ABC, which was invented for the purpose of teaching programming.
When teaching programming, I must second EHaskins's suggestion ...
How does a Java HashMap handle different objects with the same hash code?
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You can find excellent information at http://javarevisited.blogspot.com/2011/02/how-hashmap-works-in-java.html
To Summarize:
HashMap works on the principle of hashing
put(key, value): HashMap stores both key and value object as Map.En...
Is there a generator version of `string.split()` in Python?
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Excellent! I had forgotten about finditer. If one were interested in doing something like splitlines, I would suggest using this RE: '(.*\n|.+$)' str.splitlines chops off the trainling newline though (something that I don't r...
Simultaneously merge multiple data.frames in a list
...the ... argument
reshape::merge_all(list_of_dataframes, ...)
Here is an excellent resource on different methods to merge data frames.
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