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how to change directory using Windows command line
...ironment variable, for example cd %temp%. In case if current drive differs from temp folder drive cd %temp% do nothing. cd /d %temp% should be used as @Stephan said
– oleksa
Nov 17 '15 at 11:26
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Specifying an Index (Non-Unique Key) Using JPA
...u like living on the edge, you can get the latest snapshot for eclipselink from their maven repository (groupId:org.eclipse.persistence, artifactId:eclipselink, version:2.5.0-SNAPSHOT). For just the JPA annotations (which should work with any provider once they support 2.1) use artifactID:javax.pers...
Can we have functions inside functions in C++?
...h, that's neat! I didn't think of it. This is much better than my idea, +1 from me.
– sbi
Dec 1 '10 at 13:32
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Comment out text in R Markdown (Rmd file)
...```{r}
# x = pi
# ```
---
Note however that this does not prevent knitr from evaluating inline r code.
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Find the closest ancestor element that has a specific class
...hod when you need to get a parent container which might be up a few levels from the given element, like finding the containing <form> of a clicked <button>. Looks through the parents until the matching selector is found, or until it reaches the <body>. Returns either the matching e...
What are database normal forms and can you give examples? [closed]
...self. A casual user should be able to read your answer and get some value from it without having to click the blog link. The answer should be self-contained, in other words.
– Robert Harvey
Oct 22 '12 at 23:03
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What is the use of the %n format specifier in C?
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From here we see that it stores the number of characters printed so far.
n The argument shall be a pointer to an integer into which is written the number of bytes written to the output so far by this call to one of the ...
URL encode sees “&” (ampersand) as “&” HTML entity
...ing to encodeURIComponent(), which is the correct method to use, is coming from the result of accessing the innerHTML property. The solution is to get the innerText/textContent property value instead:
var str,
el = document.getElementById("myUrl");
if ("textContent" in el)
str = encodeUR...
How do I configure Maven for offline development?
...at the -o option doesn't work properly and that the go-offline goal is far from sufficient to allow a full offline build: See the solution I found here: stackoverflow.com/q/43661755/1767316
– user1767316
Apr 28 '17 at 7:19
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Does a UNIQUE constraint automatically create an INDEX on the field(s)?
...ike a regular index with added checking for uniqueness. Using SHOW INDEXES FROM customer you can see your unique keys are in fact B-tree type indexes.
A composite index on (email, user_id) is enough, you don't need a separate index on email only - MySQL can use leftmost parts of a composite index. ...