Throughout this article you have seen that there is more than one way to map object schemas to data schemas – there are four ways to map inheritance structures , two ways to map a one-to-one relationship (depending on where you put the foreign key), and four ways to map class-scope properties . Because you have mapping choices, and because each mapping choice has its advantages and disadvantages, there are opportunities to improve the data access performance of your application by changing your choice of mapping. Perhaps you implemented the one table per class approach to mapping inheritance only to discover that it’s too slow, motivating you to refactor it to use the one table per hierarchy approach.
Then, at fourteen, I spent a semester at a ski program in Switzerland. I found myself gazing at the Alps wondering what possessed Hannibal to attempt them with his herd of elephant! This country with four official languages, had 450 different varieties of Swiss cheese, with further “variety within the varieties”, which the locals told me was a combination of vegetation and techniques passed from one generation to the next. We studied European history, and Swiss Mountain Guides taught us how to read snow and avalanche conditions. We watched weather to predict whether we would be skiing ice or powder from the way the crystals set up on our jackets. By then, I was a reader but reading comprehension alone could not have guaranteed success in these places. Thanks to my dyslexia, I had the foundation to employ multiple paths of engagement, which helped me draw as much meaning out of these experiences as possible.
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