Let me respond with another question: How important is SQL for a JPA developer?
Mappers eliminate the boring and error-prone stuff like "execute SELECT", "read fields", "call setters" etc. They can automatically perform conversions, apply optimizations, etc etc etc. Mappers do not remove the need of a developer to think about that what (s)he's coding. IMO mappers help and make life easier. Period. Means: you should always know what the "thing" does to read/write your data. Practically not down to the details - but the concepts and pitfalls should be known. If you don't you will get into trouble - sooner or later. Robert PS: I avoid the abbreviation ORM - it includes the term "relational" ;) Am 22.07.2014 um 22:00 schrieb jcllings <jclli...@gmail.com>: > OK to clarify, I don't mean as an Administrator but an application developer. > If you use an ORM how important is CQL3? The object being to eliminate any > *QL from Java code. > Perhaps this technology isn't as mature as I thought. > > Jim C. > > On 07/22/2014 12:42 PM, DuyHai Doan wrote: >> "What kinds of things would it be good to know for an interview?" >> >> The underlying storage engine and how CQL3 maps to it. It's more than >> important, it's crucial. Knowing what you do and what you can't with CQL3 is >> not sufficient. >> >> >> >> >> On Tue, Jul 22, 2014 at 9:20 PM, jcllings <jclli...@gmail.com> wrote: >> So It seems that: >> >> 1. There are indeed a few (3-4) mapping schemes. >> 2. CQL isn't very hard and represents a subset of (ANSI?) SQ92. >> >> Both of these are validated based on further research and list guidance. >> >> It appears that learning Cassandra from an application developers >> perspective essentially means learning what you can't do at all and >> learning what you can't do directly that you could do with an RDMBS. >> This and keys and maybe a thing or two about replication strategies and >> you should be good to go. Does this seem accurate? >> >> What kinds of things would it be good to know for an interview? >> >> Jim C. >> >> >
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