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What's the difference between JPA and Spring Data JPA?
...pecification (these implementations are usually referred to as Providers). By using Hibernate you tie yourself to that provider restricting your freedom to switch to another option when required (for example, you want to use EclipseLink or ObjectDB instead because Hibernate has a bug that halts your...
How many GCC optimization levels are there?
...iption format described in the internals documentation and translated to C by opth-gen.awk and optc-gen.awk.
It contains the following interesting lines:
O
Common JoinedOrMissing Optimization
-O<number> Set optimization level to <number>
Os
Common Optimization
Optimize for space rather...
How can I determine what font a browser is actually using to render some text?
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"Starting in Firefox 47, the Fonts view is disabled by default. We're working on a more fully-featured replacement. For the time being, if you want to see the Fonts view, visit about:config, find the preference devtools.fontinspector.enabled, and set it to true." See develop...
How to convert java.util.Date to java.sql.Date?
...date-time classes bundled with early versions of Java have been supplanted by the new java.time package. See Oracle Tutorial. Much of the functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP.
A SQL data type DATE is meant to be date-...
How to achieve code folding effects in Emacs?
...support imenu. M-ximenu will let you jump to a function definition (etc.) by name. You can also bind it to a mouse click to get a menu of functions (or add it to the menubar; see the Info page for more detail). It provides data for which-function-mode, which will let you see which function you ar...
How can I loop through a C++ map of maps?
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@TannerSummers because accessing by value would add the inefficiency of copying each element; additionally if you wanted to modify the contents, you'd need to access the elements by references (or pointers) rather than by value.
– Riot
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Can I create more than one repository for github pages?
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You can have one site published to https://<username>.github.io by publishing to the master branch of a repository named “username.github.io” (substituting your actual username).
You can also have an additional site per GitHub project published to https://<username>.github.io/&...
Memoization in Haskell?
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We can do this very efficiently by making a structure that we can index in sub-linear time.
But first,
{-# LANGUAGE BangPatterns #-}
import Data.Function (fix)
Let's define f, but make it use 'open recursion' rather than call itself directly.
f :: (In...
MySQL error: key specification without a key length
...or BLOB column, try to use VARCHAR type and place a limit of length on it. By default, VARCHAR is limited to a maximum of 255 characters and its limit must be specified implicitly within a bracket right after its declaration, i.e VARCHAR(200) will limit it to 200 characters long only.
Sometimes, ev...
d3 axis labeling
...'t built-in to D3's axis component, but you can add labels yourself simply by adding an SVG text element. A good example of this is my recreation of Gapminder’s animated bubble chart, The Wealth & Health of Nations. The x-axis label looks like this:
svg.append("text")
.attr("class", "x la...