Should the data validation be in the application/business layer or should it part of the data access layer-acting as a gateway to what goes into the data store?
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It depends:
- Always validate and/or sanitize user-input.
- Validation in the data access layers facilitates multiple applications without redundant validation code.
- In client/server communications, client-side pre-validation can save a round-trip (when the data is invalid).
EthanB
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