Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>That is an incorrect characterization of dependency injection. It is not that you have one implementation of a particular interface that changes over time; rather, it is possible that there will be many different implementations of an interface all at once, and which implementation will be used can vary over multiple different runs of the program. For example, in your actual program, you might want to use one implementation, while during unit testing, you might want to "mock out" that implementation with an alternative version that is easier to test. In this case, refactoring is not a solution, because you need to be able to test all the time without interrupting the rest of the development process.</p> <p>It should also be noted that dependency injection is usually used as a solution to the Singleton anti-pattern; it allows one to have a singleton object that can be easily mocked out during testing. And, if later it turns out that the singleton assumption really is incorrect, that singleton can be replaced with various implementations.</p> <p>Some resources which you may find helpful in better understanding the topic:</p> <ul> <li><a href="http://www.youtube.com/watch?v=8RGhT-YySDY" rel="nofollow noreferrer">Java on Guice: Dependency Injection the Java Way</a></li> <li><a href="http://www.youtube.com/watch?v=hBVJbzAagfs" rel="nofollow noreferrer">Big Modular Java with Google Guice</a></li> <li><a href="http://misko.hevery.com/2008/08/17/singletons-are-pathological-liars/" rel="nofollow noreferrer">Singletons are Pathological Liars</a></li> <li><a href="http://blogs.msdn.com/scottdensmore/archive/2004/05/25/140827.aspx" rel="nofollow noreferrer">Why Singletons are Evil</a></li> <li><a href="http://misko.hevery.com/2008/08/25/root-cause-of-singletons/" rel="nofollow noreferrer">Root Cause of Singletons</a></li> <li><a href="http://misko.hevery.com/2008/10/21/dependency-injection-myth-reference-passing/" rel="nofollow noreferrer">Dependency Injection Myth: Reference Passing</a></li> </ul>
    singulars
    1. This table or related slice is empty.
    1. PODependency Injection: What's wrong with good old-fashioned refactoring?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USMichael Aaron Safyan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PODependency Injection: What's wrong with good old-fashioned refactoring?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COAlso: A class that needs a dependency does not need to worry about to construct that dependency. That can be left up to the writer of the implementation.
      singulars
      1. PO
      1. USJeremy
    2. COGood explanation. Thanks.
      singulars
      1. PO
      1. USChuck
    3. COThanks for the resources. I wish I can up-vote twice!
      singulars
      1. PO
      1. USEnno Shioji
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload