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Hibernate lazy-load application design
...osing session context in my own application caches. Typical case:
object foo is loaded and put into a map;
another thread takes this object from the map and calls foo.getBar() (something that was never called before and is lazy evaluated);
boom!
So, to address this we have a number of rules:
w...
how to check the jdk version used to compile a .class file [duplicate]
...the ".class" in the command otherwise I got a message, "Error: Cannot find foo.class". So doing, "javap -verbose foo | grep "major"" worked. Just a heads up. stackoverflow.com/questions/13356811/…
– Kyle Bridenstine
Dec 1 '15 at 19:21
...
SQLite - UPSERT *not* INSERT or REPLACE
...D=1:
INSERT OR REPLACE INTO Employee (id, name, role)
VALUES (1, 'John Foo', 'CEO');
BAD: This will insert or replace 2 of the columns... the NAME column will be set to NULL or the default value:
INSERT OR REPLACE INTO Employee (id, role)
VALUES (1, 'code monkey');
GOOD: Use SQLite O...
how perform grep operation on all files in a directory
... to do multiple commands, you could use:
for I in `ls *.sql`
do
grep "foo" $I >> foo.log
grep "bar" $I >> bar.log
done
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find -exec cmd {} + vs | xargs
... etc. This can be a security vulnerability as if there is a filename like "foo -o index.html" then -o will be treated as an option. Try in empty directory: "touch -- foo\ -o\ index.html; find . | xargs cat". You'll get: "cat: invalid option -- 'o'"
– Tometzky
M...
Why does Google prepend while(1); to their JSON responses?
...bject, when not enclosed by anything, is not valid in Javascript:
eval('{"foo":"bar"}')
// SyntaxError: Unexpected token :
This is however valid JSON:
JSON.parse('{"foo":"bar"}')
// Object {foo: "bar"}
So, make sure you always return an Object at the top level of the response makes sure that t...
Python list sort in descending order
...d %H:%M:%S')[0:6], reverse=True)
Passing a function to list.sort:
def foo(x):
return time.strptime(x, '%Y-%m-%d %H:%M:%S')[0:6]
timestamp.sort(key=foo, reverse=True)
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How to exclude file only from root folder in Git
...ash at the ends limits the match to folders only. If you had a file named 'foo' in the root directory, /foo/ would not ignore it, but /foo would.
– tehDorf
Jun 20 '17 at 0:19
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Private setters in Json.Net
...e a constructor that has a parameter matching your property:
public class Foo
{
public string Bar { get; }
public Foo(string bar)
{
Bar = bar;
}
}
Now this works:
string json = "{ \"bar\": \"Stack Overflow\" }";
var deserialized = JsonConvert.DeserializeObject<Foo>...
Function overloading by return type?
...rred overloads would be an improvement. Among other things, suppose types Foo and Bar support bidirectional conversion, and a method uses type Foo internally but returns type Bar. If such method is called by code which will immediately coerce the result to type Foo, using the Bar return type might...