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To implement a schema level update, two steps must be taken:
The new numeric schema level must be specified in the plugin’s descriptor file.
The actual schema update must be implemented.
Define new schema level in plugin descriptor
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There are several helper methods available to accomplish common tasks like adding or altering columns or executing custom SQL statements:
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Please keep in mind that a database schema update cannot be undone automatically! Have a fresh backup at hand to be able to rollback the database if needed. |