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Viewing changes to lib/lp/services/database/doc/db-policy.txt

  • Committer: Curtis Hovey
  • Date: 2011-12-24 17:49:30 UTC
  • mto: This revision was merged to the branch mainline in revision 14602.
  • Revision ID: curtis.hovey@canonical.com-20111224174930-xk1d5cvhyxq46ctf
Moved webapp to lp.services.

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lib/lp/services/database/doc/db-policy.txt
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To alter this behavior, you can install a different database policy.
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    >>> from canonical.launchpad.webapp.dbpolicy import SlaveDatabasePolicy
 
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    >>> from lp.services.webapp.dbpolicy import SlaveDatabasePolicy
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    >>> with SlaveDatabasePolicy():
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    ...     default_janitor = IStore(Person).find(
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    ...         Person, Person.name == 'janitor').one()
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raise an exception if an attempt is made to access master database
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resources.
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    >>> from canonical.launchpad.webapp.dbpolicy import (
 
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    >>> from lp.services.webapp.dbpolicy import (
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    ...     SlaveOnlyDatabasePolicy)
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    >>> with SlaveOnlyDatabasePolicy():
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    ...     whoops = IMasterStore(Person).find(
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the database at all starting a new and potentially long running
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database transaction.
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    >>> from canonical.launchpad.webapp.dbpolicy import DatabaseBlockedPolicy
 
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    >>> from lp.services.webapp.dbpolicy import DatabaseBlockedPolicy
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    >>> with DatabaseBlockedPolicy():
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    ...     whoops = IStore(Person).find(
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    ...         Person, Person.name == 'janitor').one()
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IStoreSelector utility for cases where the 'with' syntax cannot
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be used.
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    >>> from canonical.launchpad.webapp.interfaces import IStoreSelector
 
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    >>> from lp.services.webapp.interfaces import IStoreSelector
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    >>> getUtility(IStoreSelector).push(SlaveDatabasePolicy())
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    >>> try:
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    ...     default_janitor = IStore(Person).find(
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for a master store fail and the default store is always the slave.
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    >>> from lp.services.database.tests.readonly import read_only_mode
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    >>> from canonical.launchpad.webapp.dbpolicy import MasterDatabasePolicy
 
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    >>> from lp.services.webapp.dbpolicy import MasterDatabasePolicy
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    >>> from contextlib import nested
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    >>> with nested(read_only_mode(), MasterDatabasePolicy()):