大约有 48,000 项符合查询结果（耗时：0.0557秒） [XML]
PreparedStatement IN clause alternatives?
...
An analysis of the various options available, and the pros and cons of each is available here.
The suggested options are:
Prepare SELECT my_column FROM my_table WHERE search_column = ?, execute it for each value and UNION the results client-side. Requires only one pre...
Calculate the median of a billion numbers
If you have one billion numbers and one hundred computers, what is the best way to locate the median of these numbers?
25 A...
In what order do static/instance initializer blocks in Java run?
...
See section 12.4 and 12.5 of the JLS version 8, they go into gory detail about all of this (12.4 for static and 12.5 for instance variables).
For static initialization (section 12.4):
A class or interface type T will be initialized immediat...
Concept behind these four lines of tricky C code
...- -------- --------
+ shows the position of the sign; ^ of the exponent, and - of the mantissa (i.e. the value without the exponent).
Since the representation uses binary exponent and mantissa, doubling the number increments the exponent by one. Your program does it precisely 771 times, so the ex...
Callback functions in C++
In C++, when and how do you use a callback function?
10 Answers
10
...
What do ellipsis […] mean in a list?
...inside itself, which can not be printed. p contains p which contains p ... and so on. The [...] notation is a way to let you know this, and to inform that it can't be represented! Take a look at @6502's answer to see a nice picture showing what's happening.
Now, regarding the three new items after ...
How to export all data from table to an insertable sql format?
... in a database (call it A_db ) in Microsoft SQL Server Management Studio, and there are 10 rows.
6 Answers
...
How do I add more members to my ENUM-type column in MySQL?
...
Most ALTER TABLE commands will completely rewrite the whole table. Is mysql clever enough to not do that with enum ?
– John
Oct 9 '18 at 22:10
...
How to find and return a duplicate value in array
...s isn't very elegant answer, but I love it. It's beautiful one liner code. And works perfectly fine unless you need to process huge data set.
Looking for faster solution? Here you go!
def find_one_using_hash_map(array)
map = {}
dup = nil
array.each do |v|
map[v] = (map[v] || 0 ) + 1
...
How do RVM and rbenv actually work?
I am interested in how RVM and rbenv actually work.
5 Answers
5
...