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How can I remove specific rules from iptables?
... executed the same command, but with -D instead of -I. But i get BAD RULE (does a matching rule exists)...
– Ben
Feb 27 '15 at 11:33
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What is the difference between Unidirectional and Bidirectional JPA and Hibernate associations?
...ation 5 (on page 42). Unfortunately the example given in the specification does not give more details, so it does not give an idea of the level of complexity.
When not using a second level cache it is usually not a problem to do not have the relationship methods correctly implemented because the in...
Get real path from URI, Android KitKat new storage access framework [duplicate]
...It will also fail for any Uri that is from some other ContentProvider that does not happen to support the _data pattern (e.g., FileProvider). A Uri is an opaque handle; treat it as such, using ContentResolver to get at the content identified by the Uri.
– CommonsWare
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Why don't self-closing script elements work?
...ther the HTML or XML parser looks inside the document, and the HTML parser does not understand <script />.
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Can I write a CSS selector selecting elements NOT having a certain class or attribute?
...ostic aspects of CSS is often the same across media types — if a browser doesn't support :not() on the screen, it won't support it in print either.
– BoltClock♦
Feb 2 '12 at 10:10
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Testing two JSON objects for equality ignoring child order in Java
...n which my quick read of their ObjectNode.equals() implementation suggests does the set membership comparison that you want:
public boolean equals(Object o)
{
if (o == this) return true;
if (o == null) return false;
if (o.getClass() != getClass()) {
return false;
}
Objec...
Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
In Rails we can do the following in case a value doesn't exist to avoid an error:
12 Answers
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MySQL “WITH” clause
.../
Below is my earlier answer, which I originally wrote in 2008.
MySQL 5.x does not support queries using the WITH syntax defined in SQL-99, also called Common Table Expressions.
This has been a feature request for MySQL since January 2006: http://bugs.mysql.com/bug.php?id=16244
Other RDBMS products...
HashMap to return default value for non-found keys?
...all Map#getOrDefault(...).
[Original]
There's no Map implementation that does this exactly but it would be trivial to implement your own by extending HashMap:
public class DefaultHashMap<K,V> extends HashMap<K,V> {
protected V defaultValue;
public DefaultHashMap(V defaultValue) {
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What is the difference between _tmain() and main() in C++?
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_tmain does not exist in C++. main does.
_tmain is a Microsoft extension.
main is, according to the C++ standard, the program's entry point.
It has one of these two signatures:
int main();
int main(int argc, char* argv[]);
Micr...