大约有 40,000 项符合查询结果（耗时：0.0339秒） [XML]
Proper way to use **kwargs in Python
...e a default value. kwargs is nice because you can submit your args in any order you choose. Positional arguments don't give you that freedom.
– Kekoa
Jul 8 '09 at 14:57
95
...
What is a serialVersionUID and why should I use it?
...I wouldn't expect it to say you need one - but it may be suggesting one in order to help you serialize exceptions correctly. If you're not going to serialize them, you really don't need the constant.
– Jon Skeet
Jun 15 '14 at 18:43
...
Do htmlspecialchars and mysql_real_escape_string keep my PHP code safe from injection?
...It is not a magic bullet. All it will do is escape dangerous characters in order that they can be safe to use in a single query string. However, if you do not sanitise your inputs beforehand, then you will be vulnerable to certain attack vectors.
Imagine the following SQL:
$result = "SELECT fields...
NumPy array initialization (fill with identical values)
...Rolf Bartstra.)
a=np.empty(n); a.fill(5) is fastest.
In descending speed order:
%timeit a=np.empty(1e4); a.fill(5)
100000 loops, best of 3: 5.85 us per loop
%timeit a=np.empty(1e4); a[:]=5
100000 loops, best of 3: 7.15 us per loop
%timeit a=np.ones(1e4)*5
10000 loops, best of 3: 22.9 us per lo...
Does bit-shift depend on endianness?
... new value is stored back in memory, which is where the little endian byte order comes into effect again.
Update, thanks to @jww: On PowerPC the vector shifts and rotates are endian sensitive. You can have a value in a vector register and a shift will produce different results on little-endian and...
Get record counts for all tables in MySQL database
...
add "select * from (" at beginning and ") as output order by exact_row_count desc" at the end of generated query after removing last UNION to get order by table count desc
– Raghavendra
Jun 22 '18 at 5:42
...
Operation on every pair of element in a list
...,1 3,2 3,3 3,4
4,1 4,2 4,3 4,4
permutations() generates all unique orderings of each unique pair of elements, eliminating the x,x duplicates:
. 1,2 1,3 1,4
2,1 . 2,3 2,4
3,1 3,2 . 3,4
4,1 4,2 4,3 .
Finally, combinations() only generates each unique pair of elements, in ...
What is the easiest way to ignore a JPA field during persistence?
...
This answer comes a little late, but it completes the response.
In order to avoid a field from an entity to be persisted in DB one can use one of the two mechanisms:
@Transient - the JPA annotation marking a field as not persistable
transient keyword in java. Beware - using this keyword, w...
Unique Key constraints for multiple columns in Entity Framework
...et; }
The second parameter in the attribute is where you can specify the order of the columns in the index.
More information: MSDN
share
|
improve this answer
|
follow
...
IntelliJ IDEA with Junit 4.7 “!!! JUnit version 3.8 or later expected:”
...xample.intellijgradletest.MainActivityTest"
– Heath Borders
Feb 4 '14 at 15:38
7
In IDEA 14.0.3 f...