What method may be overwritten on the data entity staging table to update fields data before it is inserted into the staging table?
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I have the same question (0)You didn't tell us whether you mean import (putting data to staging from external sources) or export (putting data to staging from the entity).
Assuming that you mean import, it's actually the SSIS package, not the entity class, who inserts data to the staging table. In general, you shouldn't interfere with that; you should deal with business logic in the step between staging and the actual data entity. Exceptions exist, though, and you can create a static postGetStagingData() method on your entity to manipulate data inserted in the given group. Look at ExchangeRateEntity.postGetStagingData(), for example.