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When does static class initialization happen?
When are static fields initialized? If I never instantiate a class, but I access a static field, are ALL the static blocks and private static methods used to instantiate private static fields called (in order) at that instant?
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HTTPS and SSL3_GET_SERVER_CERTIFICATE:certificate verify failed, CA is OK
...but no longer bundles ANY CA certs. So by default it'll reject all SSL certificates as unverifiable.
You'll have to get your CA's cert and point curl at it. More details at cURLS's Details on Server SSL Certificates.
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Windows batch: call more than one command in a FOR loop?
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@jww && will fail if the first command fails, & will execute the second command regardless.
– yyny
Mar 14 '16 at 21:27
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Ruby get object keys as array
I am new to Ruby, if I have an object like this
4 Answers
4
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Cannot drop database because it is currently in use
...tabase and then, to drop it:
Try
SP_WHO to see who connected
and KILL if needed
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Changing the maximum length of a varchar column?
...olumn <<new_datatype>> [NULL | NOT NULL]
But remember to specify NOT NULL explicitly if desired.
ALTER TABLE YourTable ALTER COLUMN YourColumn VARCHAR (500) NOT NULL;
If you leave it unspecified as below...
ALTER TABLE YourTable ALTER COLUMN YourColumn VARCHAR (500);
Then the co...
Selecting element by data attribute
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$('*[data-customerID="22"]');
You should be able to omit the *, but if I recall correctly, depending on which jQuery version you’re using, this might give faulty results.
Note that for compatibility with the Selectors API (document.querySelector{,all}), the quotes around the attribute valu...
Bash script absolute path with OS X
...1" || echo "$PWD/${1#./}"
}
realpath "$0"
This prints the path verbatim if it begins with a /. If not it must be a relative path, so it prepends $PWD to the front. The #./ part strips off ./ from the front of $1.
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How to convert byte array to string and vice versa?
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Your byte array must have some encoding. The encoding cannot be ASCII if you've got negative values. Once you figure that out, you can convert a set of bytes to a String using:
byte[] bytes = {...}
String str = new String(bytes, "UTF-8"); // for UTF-8 encoding
There are a bunch of encodings ...
Rename multiple files by replacing a particular pattern in the filenames using a shell script [dupli
...he file) is the output of the sed command that replaces IMG with VACATION.
If your filenames include whitespace pay careful attention to the "$f" notation. You need the double-quotes to preserve the whitespace.
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