By Joseph Ottinger, Jeff Linwood, Dave Minter
Starting Hibernate, third version is perfect if you are skilled in Java with databases (the conventional, or "connected," approach), yet new to open-source, light-weight Hibernate, a number one object-relational mapping and database-oriented software improvement framework. This booklet packs in information regarding the discharge of the Hibernate 4.x patience layer and offers a transparent creation to the present normal for object-relational endurance in Java. and because the booklet retains its specialise in Hibernate with no losing time on nonessential third-party instruments, you can still instantly begin construction transaction-based engines and purposes.
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Additional info for Beginning Hibernate, 3rd Edition
Put(lastSkillName, sum/count); } return results; } The internal findRankingsFor() method (as with all of our methods that calculate averages) is really not very attractive. 9 One possibility for checking for side effects might be clearing the entire dataset (as we did in the RankingTest code, by closing the SessionFactory down every test), then clearing the data we expected to write and looking for any extraneous data. There are certainly other possibilities, but all of these are out of our scope here.
2 Updating Data What if we want to change data? Suppose that Gene Showrama, who in our example code ranked J. C. Smell as a 6 in Java, realizes that he has changed his opinion? Let’s see what we have to do to update data. First, let’s take our Ranking average calculation routine and refactor it into a reusable method. ) Next, we’ll write our test to update the data, and then recalculate the average, testing it to make sure our data is persisted correctly. See Listing 3-11. Listing 3-11. setString("subject", "J.
Update a Ranking Next, we handle the (not very likely) situation of updating a Ranking. This is potentially very simple, but we need to think about what happens if a pre-existing Ranking doesn’t exist. Imagine Drew Lombardo trying to change J. C. Smell’s mastery of Mule to 8, when he’s not bothered to offer any other Ranking yet. We probably don’t need to think about it too much, because in this situation it’s likely that we’d just add the Ranking, but other more mission-critical applications may want the extra time spent in thought.