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@UniqueConstraint annotation in Java
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@Entity
@Table(uniqueConstraints={@UniqueConstraint(columnNames = {"id_1" , "id_2"})})
public class class_name {
@Id
@GeneratedValue
public Long id;
@NotNull
public Long id_1;
@NotNull
public Long id_2;
}
Hope it helped.
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JSTL in JSF2 Facelets… makes sense?
...and create/manipulate its children using Java code in a backing bean with new SomeComponent() and what not, then you should immediately stop and consider using JSTL instead. As JSTL is also XML based, the code needed to dynamically create JSF components will become so much better readable and maint...
using href links inside tag
...he page (eg., sort order.) These can be implemented either by AJAX to load new content into the page, or, in older implementations, by triggering new page loads, which is essentially a page link.
IMHO these are valid uses of a form control.
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Detect Click into Iframe using JavaScript
...unds as is the more popular answer on this thread.
– newms87
Mar 8 '19 at 16:59
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Bring element to front using CSS
...index placed on a container farther up in the hierarchy basically starts a new "layer"
Incep[inception]tion
Here's a fiddle to play around:
https://jsfiddle.net/orkLx6o8/
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Do HTML5 custom data attributes “work” in IE 6?
...getAttribute("data-geoff") will work everywhere.
In the very near future, new versions of Firefox and Safari will start to support the data attributes, but given that there's a perfectly good way of accessessing it that works in all browsers, then there's really no reason to be using the HTML5 meth...
Rails: How can I set default values in ActiveRecord?
...o go for the following reasons:
default_scope will initialize values for new models, but then that will become the scope on which you find the model. If you just want to initialize some numbers to 0 then this is not what you want.
Defining defaults in your migration also works part of the time... ...
Fragment onCreateView and onActivityCreated called twice
... Works perfectly with "previous ref. TabListener" Android sample - tnx. Newest Android "TabListener ref. sample" [as on 4 ix 2013] is really, really wrong.
– Grzegorz Dev
Sep 4 '13 at 8:07
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Differences between fork and exec
...mplifies the spirit of UNIX in that it provides a very simple way to start new processes.
The fork call basically makes a duplicate of the current process, identical in almost every way. Not everything is copied over (for example, resource limits in some implementations) but the idea is to create a...
How can I get a resource content from a static context?
...f your <application> tag in the AndroidManifest.xml to point to your new class, e.g. android:name=".App"
In the onCreate() method of your app instance, save your context (e.g. this) to a static field named mContext and create a static method that returns this field, e.g. getContext():
This i...