大约有 13,000 项符合查询结果（耗时：0.0158秒） [XML]
For loop example in MySQL
...+1;
end while;
commit;
end #
delimiter ;
call load_foo_test_data();
select * from foo order by id;
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Why .NET String is immutable? [duplicate]
... before StringBuilder becomes more efficient than the equivalent series of concatenations, with their inherent construction).
It would be a disadvantage if mutability was part of the purpose of an object (who'd want to be modeled by an Employee object whose salary could never ever change) though so...
Convert array of integers to comma-separated string
...= new int[5] {1,2,3,4,5};
You can use Linq for it
String arrTostr = arr.Select(a => a.ToString()).Aggregate((i, j) => i + "," + j);
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Max or Default?
...d, you can get around this limitation by casting to a nullable within your select. My VB is a little rusty, but I think it'd go something like this:
Dim x = (From y In context.MyTable _
Where y.MyField = value _
Select CType(y.MyCounter, Integer?)).Max
Or in C#:
var x = (from y...
Adding two Java 8 streams, or an extra element to a stream
...
If you add static imports for Stream.concat and Stream.of, the first example could be written as follows:
Stream<Foo> stream = concat(stream1, concat(stream2, of(element)));
Importing static methods with generic names can result in code that becomes dif...
FIND_IN_SET() vs IN()
...
SELECT name
FROM orders,company
WHERE orderID = 1
AND companyID IN (attachedCompanyIDs)
attachedCompanyIDs is a scalar value which is cast into INT (type of companyID).
The cast only returns numbers up to the...
Getting request payload from POST request in Java servlet
... This is interesting, but looks quite inefficient in terms of string concatenation! Any way this can be improved?
– davidfrancis
Aug 15 '16 at 15:47
11
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Concatenate two string literals
...erated C++ by Koenig. He writes that "the new idea is that we can use + to concatenate a string and a string literal - or, for that matter, two strings (but not two string literals).
...
How do I check if an index exists on a table field in MySQL?
...
Try:
SELECT * FROM information_schema.statistics
WHERE table_schema = [DATABASE NAME]
AND table_name = [TABLE NAME] AND column_name = [COLUMN NAME]
It will tell you if there is an index of any kind on a certain column wi...
Using Gulp to Concatenate and Uglify files
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It turns out that I needed to use gulp-rename and also output the concatenated file first before 'uglification'. Here's the code:
var gulp = require('gulp'),
gp_concat = require('gulp-concat'),
gp_rename = require('gulp-rename'),
gp_uglify = require('gulp-uglify');
gulp.task(...