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What is the difference between synchronous and asynchronous programming (in node.js)
...m will block in the first line. The next line (console.log) will have to wait.
In the second example, the console.log will be executed WHILE the query is being processed. That is, the query will be processed in the background, while your program is doing other things, and once the query data is rea...
UPDATE multiple tables in MySQL using LEFT JOIN
...
SET t1.col1 = newvalue
WHERE t2.id IS NULL
Note that for a SELECT it would be more efficient to use NOT IN / NOT EXISTS syntax:
SELECT t1.*
FROM t1
WHERE t1.id NOT IN
(
SELECT id
FROM t2
)
See the article in my blog for performance details:
Fin...
How do I verify that an Android apk is signed with a release certificate?
How can I check that an Android apk is signed with a release and not debug cert?
5 Answers
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Difference between Visual Basic 6.0 and VBA
...tain and execute your project. You'll also not be able to create COM DLLs with VBA.
Apart from that, there is a difference in the IDE - the VB 6.0 IDE is more powerful in comparison. On the other hand, you have tight integration of the host application in VBA. Application-global objects (like "Acti...
image.onload event and browser cache
...follow
|
edited May 23 '17 at 11:47
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answered Sep 10 '12 at ...
Automating “enter” keypresses for bash script generating ssh keys
...o create script, which simply runs ssh-keygen -t rsa . But how to pass to it 3 times enter?
5 Answers
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Do you need to use path.join in node.js?
as everyone knows Windows does paths with backslashes where Unix does paths with forward slashes. node.js provides path.join() to always use the correct slash. So for example instead of writing the Unix only 'a/b/c' you would do path.join('a','b','c') instead.
...
Using reflect, how do you set the value of a struct field?
having a rough time working with struct fields using reflect package. in particular, have not figured out how to set the field value.
...
Yes/No message box using QMessageBox
How do I show a message box with Yes/No buttons in Qt, and how do I check which of them was pressed?
6 Answers
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How to change the color of an svg element?
...or of an image that way. If you load SVG as an image, you can't change how it is displayed using CSS or Javascript in the browser.
If you want to change your SVG image, you have to load it using <object>, <iframe> or using <svg> inline.
If you want to use the techniques in the pa...