add rant
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@ -15,16 +15,34 @@ This is called _bottom up_ mapping.
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// ."Legacy" data
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====
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Developers often refer to a pre-existing relational database as "legacy" data.
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That's perhaps a bad word to use, conjuring images of bad old "legacy apps" written in COBOL or something.
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But it's not "legacy" data—it's just your data.
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And it's valuable.
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So learning to work with "legacy" data is important.
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This tends to conjure images of bad old "legacy apps" written in COBOL or something.
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But legacy data is valuable, and learning to work with it is important.
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====
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Especially when mapping bottom up, we often need to customize the inferred object/relational mappings.
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This is a somewhat tedious topic, and so we don't want to spend too many words on it.
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Instead, we'll quickly skim the most important mapping annotations.
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[[case-convention]]
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.Hibernate SQL case convention
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****
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Computers have had lowercase letters for rather a long time now.
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Most developers learned long ago that text written in MixedCase, camelCase, or even snake_case is easier to read than text written in SHOUTYCASE.
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This is just as true of SQL as it is of any other language.
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Therefore, for over twenty years, the convention on the Hibernate project has been that:
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- query language identifiers are written in `lowercase`,
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- table names are written in `MixedCase`, and
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- column names are written in `camelCase`.
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That is to say, we simply adopted Java's excellent conventions and applied them to SQL.
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Now, there's no way we can force you to follow this convention, even if we wished to.
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Hell, you can easily write a `PhysicalNamingStrategy` which makes table and column names ALL UGLY AND SHOUTY LIKE THIS IF YOU PREFER.
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But, _by default_, that's what Hibernate does, and it's frankly a pretty sane thing to do.
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****
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[[mapping-inheritance]]
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=== Mapping entity inheritance hierarchies
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