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How important is the order of columns in indexes?
... 3, the optimizer wouldn't even use the index, because it's not helpful at all in narrowing down the result sets. Anytime you're in a query, narrowing down the number of results to deal with before the next step means better performance.
Since the index is also stored this way, there's no backtrac...
Why is “except: pass” a bad programming practice?
...y to avoid passing in except blocks. Unless explicitly desired, this is usually not a good sign.
But let’s go into detail:
Don’t catch any error
When using a try block, you usually do this because you know that there is a chance of an exception being thrown. As such, you also already have an...
Are std::vector elements guaranteed to be contiguous?
...e in the middle take linear time. Storage
management is handled automatically, though hints can be given to improve efficiency. The elements of a
vector are stored contiguously, meaning that if v is a vector where T is some type other
than bool, then it obeys the identity &v[n] == &v[0...
Design Pattern for Undo Engine
...this. Every user-action that's undoable gets its own command instance with all the information to execute the action and roll it back. You can then maintain a list of all the commands that have been executed and you can roll them back one by one.
...
In mocha testing while calling asynchronous function how to avoid the timeout Error: timeout of 2000
In my node application I'm using mocha to test my code. While calling many asynchronous functions using mocha, I'm getting timeout error ( Error: timeout of 2000ms exceeded. ). How can I resolve this?
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How to install PostgreSQL's pg gem on Ubuntu?
I'm trying to install PostgreSQL's pg gem for Ruby.
19 Answers
19
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What XML parser should I use in C++? [closed]
... process XML. Not toy XML, real XML. You need to be able to read and write all of the XML specification, not just the low-lying, easy-to-parse bits. You need Namespaces, DocTypes, entity substitution, the works. The W3C XML Specification, in its entirety.
The next question is: Does your API need to ...
Cannot generate iOS App archive in xcode
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Check Build Settings:
Skip install is NO for the main project target
Skip install is YES for framework (sub-projects) targets
In Build Phases for sub-projects, Copy Headers needs to be in Project, not Public (does not apply if building static library)
Inst...
Java: How to Indent XML Generated by Transformer
... out the resulting XML. The problem is that it isn't indenting the text at all despite having set the parameter "indent" explicitly.
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Apache POI Excel - how to configure columns to be expanded?
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After you have added all your data to the sheet, you can call autoSizeColumn(int column) on your sheet to autofit the columns to the proper size
Here is a link to the API.
See this post for more reference
Problem in fitting the excel cell size ...