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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Extra info for Beginning Hibernate: Third Edition
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.