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How to map calculated properties with JPA and Hibernate
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JPA doesn't offer any support for derived property so you'll have to use a provider specific extension. As you mentioned, @Formula is perfect for this when using Hibernate. You can use an SQL fragment:
@Formula("PRICE*1.155")
private float finalPrice;
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Handling optional parameters in javascript
...: function(){ alert('hi'); }
} );
Benefits:
you don't have to account for argument order
you don't have to do type checking
it's easier to define default values because no type checking is necessary
less headaches. imagine if you added a fourth argument, you'd have to update your type checking ...
Why use the INCLUDE clause when creating an index?
While studying for the 70-433 exam I noticed you can create a covering index in one of the following two ways.
8 Answers
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Spring MVC: How to return image in @ResponseBody?
... can specify "produces" in @RequestMapping annotation. Example below works for me out of box. No need of register converter or anything else if you have web mvc enabled (@EnableWebMvc).
@ResponseBody
@RequestMapping(value = "/photo2", method = RequestMethod.GET, produces = MediaType.IMAGE_JPEG_VALU...
How do I find which transaction is causing a “Waiting for table metadata lock” state?
I am trying to perform some DDL on a table and SHOW PROCESSLIST results in a " Waiting for table metadata lock " message.
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How to add a button to PreferenceScreen
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There is another solution for customizing the appearance of the preferences.
Design a normal XML layout with buttons or whatever you want to add to the standard preferences. Include a ListView in your layout and give it the ID @android:id/list.
Let'...
How to get a complete list of ticker symbols from Yahoo Finance? [closed]
I've googled endlessly for a method of getting a complete (and daily updated) list of all Yahoo ticker symbols available through http://finance.yahoo.com
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Make header and footer files to be included in multiple html pages
...e location as index.html
<a href="http://www.google.com">click here for google</a>
Now, when you visit index.html, you should be able to click the link tags.
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How to determine if Javascript array contains an object with an attribute that equals a given value?
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2018 edit: This answer is from 2011, before browsers had widely supported array filtering methods and arrow functions. Have a look at CAFxX's answer.
There is no "magic" way to check for something in an array without a loop. Even if you use some function, the fun...
conditional unique constraint
I have a situation where i need to enforce a unique constraint on a set of columns, but only for one value of a column.
6 A...