baybatu

Shell command that gives running processes associated with each open port.

netstat -tulpn

baybatu

jar tf my-jar-file.jar

baybatu

I ran into similar problem, where I was trying to save an object where his id was a primitive field (long), and at the time of create the object, the id was set to 0 by default, and Hibernate assumed I wanted to update the row with id = 0 (which obviously doesn't exist). My solution was change the id field to Long (wrapper), and that way, when I create a new instance the id is set to null, and Hibernate understands I am inserting a new element to the database. I hope it helps. Thanks.

Source: http://stackoverflow.com/a/30492460

baybatu

SELECT
  MIN(NVL(t.column, 0))
FROM TABLE t
WHERE t.OTHERTABLE_ID = 1234
      AND t.Condition = 1;

Eğer Condition koşulunu sağlayan herhangi bir satır bulunamazsa bu durumda MIN fonksiyonu null döner. Bunu engellemek için MIN'i NVL ile sarmak faydalı olabilir.

baybatu

If you want to use a variable value as key of your map, then you should wrap your key with parenthesis. It makes key to be considered as expression instead of String literal.

String keyVar = "mykey"

def map0 = [keyVar : 12]
assert map0.keyVar == 12
assert !map0.mykey

baybatu

// 'delete' is a process example
public void deleteOldFiles(File path) {
  long startOfDay = new Date().clearTime().time
  path.eachFile { file ->
    if (file.lastModified() < startOfDay) {
      file.delete()
    }
  }
}

baybatu

Grails'de render metoduna (1) adresindeki file ve fileName parametrelerini vererek kullanıcının istediğimiz dosyayı indirmesini sağlayabiliriz. Fakat eğer tarayıcı "dosya bulunamadı" hatası veriyorsa bu durumda Grails'deki Config.groovy dosyasında bulunan grails.mime.types listesini kontrol etmek gerekir. Eğer indirmek istediğimiz dosya türü için gerekli mime türü bu listede yoksa hata alırız. Örneğin zip dosyası indirtmek istiyorsak bu durumda listeye zip:'application/zip' kaydını girmek gerekir.

(1): http://docs.grails.org/2.4.4/ref/Controllers/render.html

Kaynak: http://mrhaki.blogspot.com.tr/2013/09/grails-goodness-render-binary-output.html

baybatu

/** 
 * Simple build metadata from system.
 * 
 * To populate application version, just give following parameter while generation WAR package on grails CLI.
 * 
 * $ grails "set-version 1.4" "clean" "war myproject.war"
 * 
 * '1.4' is just an example for build version. If you want to auto generate it by your CI such as Jenkins, then
 * create an environment variable and pass it to CLI command.
 * 

baybatu

class MyController {

  /**
  * Normally, String type method name in except part of beforeInterceptor is legal. For example:
  * 
  * def beforeInterceptor = [action: this.&intercept, except: ['index', 'hede', 'hodo']]
  * 
  * But this is not safe for future naming refactorings. Instead, using closure-maker 
  * ampersand operator(.&) before method name and then getting 'method' property to get 
  * method name as String is better for future safe changes.

baybatu

find . -name '*.pyc' -delete