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Why do some frameworks (like CakePHP, Kohana, Zend, Django, less – Rails) create some kind of SQL abstractions instead of a raw SQL database access? E.g. why do we need to make some perversions instead of a usual queries?
UPD: are there any SQL-injection reasons of this purpose?
Basically a good abstraction layer makes it easier for the developer to use a database, and not care what what and which kind of database he is connecting to, thus speeding up the development process.
Check out http://en.wikipedia.org/wiki/Database_abstraction_layer, the most common pros and cons are listed here.