Download Beginning Hibernate: Third Edition by Joseph B. Ottinger, Dave Minter, Jeff Linwood (auth.) PDF

By Joseph B. Ottinger, Dave Minter, Jeff Linwood (auth.)

Starting Hibernate, 3rd version is perfect if you’re 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 program improvement framework.

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S. ) That may be good enough for a natural identifier, although privacy advocates would rightfully complain; also, note that “several generations” might not be enough. Programmers were absolutely sure that nobody would still have data with two-digit years in them ... until Y2K, which took a lot of manhours to fix. 2 43 Chapter 4 ■ The Persistence Life Cycle There are five different generation possibilities: identity, sequence, table, auto, and none. Identity generation relies on a natural table sequencing.

Save(ranking); } This leaves our getRankingFor() method unimplemented; however, just as addRanking() was lifted nearly complete from RankingTest, we can copy the code for getAverage() and change how the Session is acquired, as shown in Listing 3-18. Listing 3-18. println(r); } return count == 0 ? 0 : sum / count; } Just as with the addRanking() method, the publicly visible method allocates a session and then delegates to an internal method, and it’s for the same reason: we may want to calculate the average in an existing session.

C. Smell, as observed by Drew Lombardo, about Mule, with a skill level of 8. It’d be easy to confuse the parameters; we’ll have to be sure to name them clearly, but even with clear names there’s a possibility for confusion. Likewise, we can say that getRankingFor() fairly clearly retrieves a ranking for J. C. Smell’s skill at Mule. Again, the possibility lurks for type confusion; the compiler wouldn’t be able to tell us offhand if we called getRankingFor("Mule", "J. C. 7 It’s fair to say that this aspect of the API is clear enough and easily tested; let’s get to writing some code.

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