| 摘要 |
A method of updating a database, including data records, to accord with an updated schema. The method includes obtaining, at a portable electronic device, the updated schema associated with the database. If a field is deleted in the updated schema, t he data records are updated by deleting the field from each of the data records. An update command is transmitted from the portable electronic device for updating the database schema for a corresponding backup database at a server.
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