Module upgrade
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Stuff dealing with the upgrade of the database schema.
From software version 0.8.2 on, there is a dc.metastore table with a
key schemaversion. Each change in the central schema increases the value
(interpreted as an integer) by one, and this module will contain a
corresponding upgrader.
An upgrader inherits form the Upgrader class. See there for more
details.
This module contains the current schemaversion expected by the
software; gavo upgrade does everything required to bring the what's in
the database in sync with the code (or so I hope).
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relationExists(tableName,
connection)
returns True if tableName (as schema.name) exists, False otherwise. |
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showProgress(msg)
outputs msg to stdout without lf "immediately". |
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dumpExtensionUpdater(conn)
prints SQL to bring [db]managedExtensions up to date. |
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iterStatements(startVersion,
endVersion=20,
upgraders=None)
yields all upgraders from startVersion to endVersion in sequence. |
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upgrade(forceDBVersion=None)
runs all updates necessary to bring a database to the
CURRENT_SCHEMAVERSION. |
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CURRENT_SCHEMAVERSION = 20
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__package__ = 'gavo.user' |
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returns (normalised) column names for tableId.
(tableId is something like //tap#tables)
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returns the schemaversion given in the database.
This will return -1 if no schemaversion is declared.
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runs all updates necessary to bring a database to the
CURRENT_SCHEMAVERSION.
Unless catastrophic things go on, each upgrade is a transaction of its
own; the first failed transaction stops the upgrade at the version last
successfully upgraded to.
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