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When and why JPA entities should implement Serializable interface?
The question is in the title. Below I just described some of my thoughts and findings.
14 Answers
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Can I use a function for a default value in MySql?
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This isn't quite the same as having a DEFAULT value. How would one change this answer to only set the key if the value was NULL?
– ToolmakerSteve
Apr 1 '15 at 17:38
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Filtering for empty or NULL names in a queryset
...and empty strings, the preferred way to do so is to chain together the conditions like so:
Name.objects.exclude(alias__isnull=True).exclude(alias__exact='')
Chaining these methods together basically checks each condition independently: in the above example, we exclude rows where alias is either n...
Format XML string to print friendly XML string
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Use XmlTextWriter...
public static string PrintXML(string xml)
{
string result = "";
MemoryStream mStream = new MemoryStream();
XmlTextWriter writer = new XmlTextWriter(mStream, Encoding.Unicode);
XmlDocument document = ...
Can overridden methods differ in return type?
...rn type is assignable to the return type of the method you are overriding, it's allowed.
For example:
class ShapeBuilder {
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public Shape build() {
....
}
class CircleBuilder extends ShapeBuilder{
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@Override
public Circle build() {
....
}
This is specified in se...
Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?
Several times I've been criticized for having suggested the use of the following methods:
9 Answers
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json_decode to array
...follow
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edited Apr 23 '14 at 17:29
Francisco Corrales Morales
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Rails 4 Authenticity Token
...king on a new Rails 4 app (on Ruby 2.0.0-p0) when I ran into some authenticity token problems.
13 Answers
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Callback functions in Java
... class can be used as well.
public class Main {
public interface Visitor{
int doJob(int a, int b);
}
public static void main(String[] args) {
Visitor adder = new Visitor(){
public int doJob(int a, int b) {
return a + b;
}
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In Javascript, how to conditionally add a member to an object?
I would like to create an object with a member added conditionally.
The simple approach is:
22 Answers
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