This sample demonstrates usage of the following features of TDatabase
[list:efro7qp8]1. Using constructor Create()
2. Appending multiple rows of data with single call to :Append()
3. Setting default value for some fields
4. Setting Readonly flag for some fields
5. Using :bValidRow to ensure writing correct data despite mistakes in UI
6. Using Triggers to autocalculate some fields.
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[code=fw:efro7qp8][/code:efro7qp8]
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