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> ORMs make porting queries to another project that needs to use the same database difficult.

Wouldn't you have written a shared library through which both projects access the same database?

I know SQL pretty well (20+ years experience), but still use ORMs with nary a reason to hand-code any SQL any more. As a small-business-focused consultant using Microsoft technologies I do realise this puts me in a different bracket than others using larger-scale datasets and so forth, however for me using an ORM makes my life easier, makes me more productive, and with a little attention to detail doesn't result in performance issues for clients.

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