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UPDATE multiple tables in MySQL using LEFT JOIN
...ble that is liked by a second table.
UPDATE t1
LEFT JOIN
t2
ON
t2.some_id = t1.some_id
LEFT JOIN
t3
ON
t2.t3_id = t3.id
SET
t1.new_column = t3.column;
This would be useful in a case where you had users and groups, and you wanted a user to be able to add their own variation of the group n...
How to create a new java.io.File in memory?
...xt
Files.write(hello, ImmutableList.of("hello world"), StandardCharsets.UTF_8);
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Table Naming Dilemma: Singular vs. Plural Names [closed]
... crazy with table names and specificity, but perhaps something like "Widget_Users" (where "Widget" is the name of your application or website) would be more appropriate.
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Idiomatic way to convert an InputStream to a String in Scala
...eamReader)
Iterator continually bufferedReader.readLine takeWhile (_ != null) mkString
}
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How to loop through a HashMap in JSP?
... answered Oct 3 '19 at 5:53
tk_tk_
11.9k55 gold badges6969 silver badges7878 bronze badges
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cannot convert data (type interface {}) to type string: need type assertion
...]i to its value type, we have to do it individually:
// var items []i
for _, item := range items {
value, ok := item.(T)
dosomethingWith(value)
}
Performance
As for performance, it can be slower than direct access to the actual value as show in this stackoverflow answer.
...
Add a background image to shape in XML Android
...t;/shape>
</item>
<item android:drawable="@drawable/image_name_here" />
</layer-list>
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What does $(function() {} ); do?
...thand for $(document).ready(), as in: $(document).ready(function() {
YOUR_CODE_HERE
});. Sometimes you have to use it because your function is running before the DOM finishes loading.
Everything is explained here: http://docs.jquery.com/Tutorials:Introducing_$(document).ready()
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How do I negate a test with regular expressions in a bash script?
Using GNU bash (version 4.0.35(1)-release (x86_64-suse-linux-gnu), I would like to negate a test with Regular Expressions. For example, I would like to conditionally add a path to the PATH variable, if the path is not already there, as in:
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How to emulate C array initialization “int arr[] = { e1, e2, e3, … }” behaviour with std::array?
...
Best I can think of is:
template<class T, class... Tail>
auto make_array(T head, Tail... tail) -> std::array<T, 1 + sizeof...(Tail)>
{
std::array<T, 1 + sizeof...(Tail)> a = { head, tail ... };
return a;
}
auto a = make_array(1, 2, 3);
However, this requires the ...