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What's a concise way to check that environment variables are set in a Unix shell script?
...st variant (using just ?) requires STATE to be set, but STATE="" (an empty string) is OK — not exactly what you want, but the alternative and older notation.
The second variant (using :?) requires DEST to be set and non-empty.
If you supply no message, the shell provides a default message.
The ${v...
How to call base.base.method()?
...yword in the children methods though.
public class SuperBase
{
public string Speak() { return "Blah in SuperBase"; }
}
public class Base : SuperBase
{
public new string Speak() { return "Blah in Base"; }
}
public class Child : Base
{
public new string Speak() { return "Blah in Child";...
Ways to iterate over a list in Java
...
So for lists of immutable types like Integer and String it would not be possible to change the contents using for-each or Iterator methods -- would have to manipulate the list object itself to replace to elements. Is that right?
– jacobq
...
CSS Pseudo-classes with inline styles
...nk of inline styles as the styles applied to some anonymous super-specific ID selector: those styles only apply to that one very element with the style attribute. (They take precedence over an ID selector in a stylesheet too, if that element has that ID.) Technically it doesn't work like that; this ...
Super-simple example of C# observer/observable with delegates
...***************/
class Program
{
static void Main(string[] args)
{
Parent p = new Parent();
}
}
////////////////////////////////////////////
public delegate void DelegateName(string data);
class Child...
How to find current transaction level?
...D AS TRANSACTION_ISOLATION_LEVEL
FROM sys.dm_exec_sessions
where session_id = @@SPID
docs.microsoft.com reference for the constant values.
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Filter by property
...lter. filtering after the query has been done is exactly what i want to avoid.
– schneck
Jul 30 '09 at 9:26
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Turning Sonar off for certain code
...'m not sure if Sonar correctly interprets @SuppressFBWarnings (added to avoid clashes with java.lang.SuppressWarnings) and also ignores it.
– Marcel Stör
Jul 17 '13 at 6:39
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Update statement with inner join on Oracle
...
That syntax isn't valid in Oracle. You can do this:
UPDATE table1 SET table1.value = (SELECT table2.CODE
FROM table2
WHERE table1.value = table2.DESC)
WHERE table1.UPDATETYPE=...
Long-lasting FB access-token for server to pull FB page info
...hat does not expire (with help from @Igy), here is a clear, step-by-step quide for all those looking to the same:
Make sure you are the admin of the FB page you wish to pull info from
Create a FB App (should be with the same user account that is the page admin)
Head over to the Facebook Graph API ...