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How to generate a simple popup using jQuery
I am designing a web page. When we click the content of div named mail, how can I show a popup window containing a label email and text box?
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How to check if a database exists in SQL Server?
What is the ideal way to check if a database exists on a SQL Server using TSQL? It seems multiple approaches to implement this.
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Find rows with multiple duplicate fields with Active Record, Rails & Postgres
What is the best way to find records with duplicate values across multiple columns using Postgres, and Activerecord?
5 Answ...
Can someone explain the “debounce” function in Javascript
I am interested in the "debouncing" function in javascript, written here : http://davidwalsh.name/javascript-debounce-function
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What is an example of the simplest possible Socket.io example?
So, I have been trying to understand Socket.io lately, but I am not a supergreat programmer, and almost every example I can find on the web (believe me I have looked for hours and hours), has extra stuff that complicates things. A lot of the examples do a bunch of things that confuse me, or connect ...
Comments in Android Layout xml
I would like to enter some comments into the layout XML files, how would I do that?
12 Answers
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How to implement LIMIT with SQL Server?
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Starting SQL SERVER 2005, you can do this...
USE AdventureWorks;
GO
WITH OrderedOrders AS
(
SELECT SalesOrderID, OrderDate,
ROW_NUMBER() OVER (ORDER BY OrderDate) AS 'RowNumber'
FROM Sales.SalesOrderHeader
)
SELECT ...
Rails 4 multiple image or file upload using carrierwave
How can I upload multiple images from a file selection window using Rails 4 and CarrierWave? I have a post_controller and post_attachments model. How can I do this?
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Is there a builtin identity function in python?
I'd like to point to a function that does nothing:
8 Answers
8
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JPA: How to have one-to-many relation of the same Entity type
...on each end of the relationship is the same. The general case is detailed in Section 2.10.2 of the JPA 2.0 spec.
Here's a worked example. First, the entity class A:
@Entity
public class A implements Serializable {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
...