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Cleanest way to build an SQL string in Java
...he other thing that can be done is to keep all queries in properties file. For example
in a queries.properties file can place the above query:
update_query=UPDATE user_table SET name=? WHERE id=?
Then with the help of a simple utility class:
public class Queries {
private static final Strin...
Transferring ownership of an iPhone app on the app store
...an now be transferred from one developer to another within iTunes Connect, for example after an acquisition or when a distribution deal expires. Transferring the ownership of an app does not affect the app’s availability on the App Store. All ratings and reviews will be transferred and your custom...
How to remove a column from an existing table?
...o figure out what to do with other tables/columns. One option is to remove foreign keys and keep referenced data in other tables.
Another option is to find all referencing columns and remove them as well if they are not needed any longer.
In such cases the real challenge is finding all foreign ke...
Understanding the Rails Authenticity Token
...
What happens
When the user views a form to create, update, or destroy a resource, the Rails app creates a random authenticity_token, stores this token in the session, and places it in a hidden field in the form. When the user submits the form, Rails looks for ...
Inline SVG in CSS
...//jsfiddle.net/6WAtQ/
(Note that the SVG content needs to be url-escaped for this to work, e.g. # gets replaced with %23.)
This works in IE 9 (which supports SVG). Data-URLs work in older versions of IE too (with limitations), but they don’t natively support SVG.
...
Maven: How to include jars, which are not available in reps into a J2EE project?
...le to the local repository. If you create a script with a Maven invocation for each file and keep it alongside the jars, you (and anyone else with access) can easily install the jars (and associated pom files) to their local repository.
For example:
mvn install:install-file -Dfile=/usr/jars/foo.ja...
What's an elegant way to conditionally add a class to an HTML element in a view?
...ur variable:
<div class="<%= 'ok' if @success %>">
A second form using the ternary ?: operator is useful if you want to choose between two classes:
<div class="<%= @success ? 'good' : 'bad' %>">
Finally, you can use Rail's record tag helpers such as div_for, which will ...
Javascript set img src
... what you should be doing. You can still use the image constructor, and perform the second action in the onload handler of your searchPic. This ensures the image is loaded before you set the src on the real img object.
Like so:
function LoadImages() {
searchPic = new Image();
searchPic.onl...
Django Forms: if not valid, show form with error message
I Django forms, it can check whether the form is valid:
7 Answers
7
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What do the plus and minus signs mean in Objective-C next to a method?
...
+ is for a class method and - is for an instance method.
E.g.
// Not actually Apple's code.
@interface NSArray : NSObject {
}
+ (NSArray *)array;
- (id)objectAtIndex:(NSUInteger)index;
@end
// somewhere else:
id myArray = [NSA...