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Correct way to use StringBuilder in SQL
...the majority of cases, it will have to do a reallocation. It's easier to read, though. Note that this is not true of a series of concatenations. So for instance, this uses one StringBuilder:
return "prefix " + variable1 + " middle " + variable2 + " end";
It roughly translates to:
StringBuilder t...
Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?
...unning JavaScript code. Which is better, in terms of functionality, page load speed, validation purposes, etc.?
54 Answers
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Java - JPA - @Version annotation
....
}
On update, the field annotated with @Version will be incremented and added to the WHERE clause, something like this:
UPDATE MYENTITY SET ..., VERSION = VERSION + 1 WHERE ((ID = ?) AND (VERSION = ?))
If the WHERE clause fails to match a record (because the same entity has already been update...
Rails: FATAL - Peer authentication failed for user (PG::Error)
...host definitely tell that app where to find its database.
development:
adapter: postgresql
encoding: unicode
database: kickrstack_development
host: localhost
pool: 5
username: kickrstack
password: secret
Make sure your user credentials are set correctly by creating a database and a...
LINQ to Entities only supports casting EDM primitive or enumeration types with IEntity interface
...
I was able to resolve this by adding the class generic type constraint to the extension method. I'm not sure why it works, though.
public static T GetById<T>(this IQueryable<T> collection, Guid id)
where T : class, IEntity
{
//...
}
...
When should one use final for method parameters and local variables?
...ublication of fields and can avoid the need for synchronization on later reads. (Note that for an object reference, only the field reference is immutable - things that object reference refers to can still change and that affects the immutability.)
Final static fields - Although I use enums now for ...
Change MySQL default character set to UTF-8 in my.cnf?
...
To set the default to UTF-8, you want to add the following to my.cnf
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8
[mysqld]
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8
If you want to cha...
Spring @PostConstruct vs. init-method attribute
...y on spring framework has been reduced to a certain extent.
But i have to admit that addition of these things increase the readability of code.So there are pros and cons both approaches.
share
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im...
git: Apply changes introduced by commit in one repo to another repo
...-verify <commit>)
is here to translate <commit> (for example HEAD, or v0.2, or master~2, which are values in the second repository you copy from) into SHA-1 identifier of commit. If you know SHA-1 of a change you want to pick, it is not necessary.
NOTE however that Git can skip copying...
Fast way of counting non-zero bits in positive integer
...rs, bin(n).count("1") is the fastest I could find in pure Python.
I tried adapting Óscar's and Adam's solutions to process the integer in 64-bit and 32-bit chunks, respectively. Both were at least ten times slower than bin(n).count("1") (the 32-bit version took about half again as much time).
On ...