大约有 30,000 项符合查询结果（耗时：0.0494秒） [XML]
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
...
It is also possible to add COLLATE utf8_unicode_ci to string constants: SET @EMAIL = 'abc@def.com' COLLATE utf8_unicode_ci;. It is especially useful if you are running a script from a console, where the console default encoding applies to your string constants' collation.
...
Jackson JSON custom serialization for certain fields
...plement a custom serializer as follows:
public class Person {
public String name;
public int age;
@JsonSerialize(using = IntToStringSerializer.class, as=String.class)
public int favoriteNumber:
}
public class IntToStringSerializer extends JsonSerializer<Integer> {
@Ove...
usr/bin/ld: cannot find -l
... not be appropriate to change the Makefile with the -Loption. I had put my extra library in /opt/lib so I did:
$ export LIBRARY_PATH=/opt/lib/
and then ran make for successful compilation and linking.
To run the program with a shared library define:
$ export LD_LIBRARY_PATH=/opt/lib/
before ...
sqlite database default time value 'now'
...sary.
Using unix epoch saves storage space - 4 bytes integer vs. 24 bytes string when stored as ISO8601 string, see datatypes. If 4 bytes is not enough that can be increased to 6 or 8 bytes.
Saving timestamp on UTC timezone makes it convenient to show a reasonable value on multiple timezones.
SQL...
How to find the kth largest element in an unsorted array of length n in O(n)?
...not very good.
Everything you need is in these powerpoint slides. Just to extract the basic algorithm of the O(n) worst-case algorithm (introselect):
Select(A,n,i):
Divide input into ⌈n/5⌉ groups of size 5.
/* Partition on median-of-medians */
medians = array of each group’s med...
How to get TimeZone from android mobile?
...ran , Iran in winter and "4.5" (4:30') for summer .
I also needed it as a string so I could post it to a server so you may not need the last line.
for getting currect time zone :
TimeZone tz = TimeZone.getDefault();
Date now = new Date();
//Import part : x.0 for double number
double offsetFromUtc...
Why do you need explicitly have the “self” argument in a Python method?
... It forces to put self as first param in every method, just extra text that doesn't make much sense as for me. Other languages work just fine with this.
– Vedmant
Jul 28 '15 at 13:29
...
How to disable a particular checkstyle rule for a particular line of code?
...e of comments in your code. E.g.
//CHECKSTYLE:OFF
public void someMethod(String arg1, String arg2, String arg3, String arg4) {
//CHECKSTYLE:ON
Or even better, use this more tweaked version:
<module name="SuppressionCommentFilter">
<property name="offCommentFormat" value="CHECKSTYLE...
Facebook Architecture [closed]
...e either. However, it's a clever idea much like HipHop to squeeze out some extra performance.
– Tom
Mar 12 '14 at 21:26
...
Time complexity of Euclid's Algorithm
... The base is the golden ratio obviously. Why? Because it takes exactly one extra step to compute nod(13,8) vs nod(8,5). For a fixed x if y<x the worst case performance is x=fib(n+1), y=fib(n). Here y depends on x, so we can look at x only.
– Stepan
Jul 27 '1...