encode_backup_temp_info() and decode_backup_temp_info() have been
introduced to keep the info field encoding in one place.
Many locations used get_backup_ids_record() to obtain info, that
makes lots of calls to get_backup_ids_record() which can be slow.
We now complete all those inline by adding the info field to the query.
To reduce memory usage, all queries of that nature have been changed
to use get_recordset_*. gzcompress was introduced if available to minimize
traffic to/from the database and to decrease the memory required for caching.
The compression time is saved by the benefits in other places of having smaller data.
This patch fixes:
* missing enrolment methods after 1.9 backup restore - defaults are added
* enrolment methods are restored only when users option is enabled
* manual enrolment override option is disabled if users not available
This patch includes following changes and new features:
* Group sync in enrol_cohort plugin.
* Option for editing of role in existing cohort sync instance.
* Group memberships are now restored after enrolments.
* New enrol method for restore of protected group membership.
* New component callback 'restore_group_member' for restore of general plugin group membership.
* New component callback 'restore_role_assignment' for restore of general plugin role assignments.
* Implemented group membership protection in enrolment UI.
* Other minor fixes and cleanup.
Notes:
* The YUI base enrolment page is not reimplemented yet - see MDL-35618.
Includes option to convert all enrolments to enrol_manual instances, support for mapping of custom fields and fixes for several other problems. This does not include support for custom enrol tables, it will be addressed in another issue.
An activity module might want to use question_usages in different ways.
We should suppport this, because it lets people make interesting
activities.
At the moment, the backup and restore code does not support this,
because it uses fixed element names for the question_usage element and
its children. This fix changes things so that a prefix can be appended
to all the element names.
* Fixed up database installation and upgrade code
* Reverted some whitespace optimisations to minimise conflicts
* Optimised commits made by Mark to reduce complexity and add tracker issue numbers
