大约有 44,000 项符合查询结果（耗时：0.0722秒） [XML]
Java Try Catch Finally blocks without Catch
...lock only. Since the catch block is excluded, how does the try block work if it encounters an exception or anything throwable? Does it just go directly to the finally block?
...
How to properly override clone method?
...one is broken.
Josh Bloch on Design - Copy Constructor versus Cloning
If you've read the item about cloning in my book, especially if you read between the lines, you will know that I think clone is deeply broken. [...] It's a shame that Cloneable is broken, but it happens.
You may read more d...
twig: IF with multiple conditions
It seem I have problem with a twig if statement.
1 Answer
1
...
Do I have to guard against SQL injection if I used a dropdown?
...ou expect.
$possibleOptions = array('All', 'Large', 'Medium', 'Small');
if(in_array($_POST['size'], $possibleOptions)) {
// Expected
} else {
// Not Expected
}
Then use mysqli_* if you are using a version of php >= 5.3.0 which you should be, to save your result. If used correctly thi...
How to use index in select statement?
...
If you want to test the index to see if it works, here is the syntax:
SELECT *
FROM Table WITH(INDEX(Index_Name))
The WITH statement will force the index to be used.
...
Fast Linux File Count for a large number of files
...
By default ls sorts the names, which can take a while if there are a lot of them. Also there will be no output until all of the names are read and sorted. Use the ls -f option to turn off sorting.
ls -f | wc -l
Note that this will also enable -a, so ., .., and other files s...
Pointer vs. Reference
...
My rule of thumb is:
Use pointers if you want to do pointer arithmetic with them (e.g. incrementing the pointer address to step through an array) or if you ever have to pass a NULL-pointer.
Use references otherwise.
...
Hashing a dictionary?
...
If your dictionary is not nested, you could make a frozenset with the dict's items and use hash():
hash(frozenset(my_dict.items()))
This is much less computationally intensive than generating the JSON string or representat...
How to dump a table to console?
...on: how do I go about installing an extension like pl.pretty? It's be nice if I could just do something like a gem install without futzing with unrolling tar balls and finding the ideal spot on my HD to situate things. Is there a quick/painless "do-it-this-way"?
– Cliff
...
Definition of a Balanced Tree
I am just wondering if someone might be able to clarify the definition of a balanced tree for me. I have that "a tree is balanced if each sub-tree is balanced and the height of the two sub-trees differ by at most one.
...