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MDL-33330 Remap all instances of an external file to a single record in files_reference

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This commit is contained in:
David Mudrak
2012-06-05 14:07:24 +02:00
parent dccba8bcc9
commit 8f47a60e4e
2 changed files with 27 additions and 1 deletions
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lib/db/upgrade.php
+26
View File
@@ -792,5 +792,31 @@ function xmldb_main_upgrade($oldversion) {
upgrade_main_savepoint(true, 2012060100.02);
}
if ($oldversion < 2012060100.03) {
// Merge duplicate records in files_reference that were created during the development
// phase at 2.3dev sites. This is needed so we can create the unique index over
// (repositoryid, referencehash) fields.
$sql = "SELECT repositoryid, referencehash, MIN(id) AS minid
FROM {files_reference}
GROUP BY repositoryid, referencehash
HAVING COUNT(*) > 1;";
$duprs = $DB->get_recordset_sql($sql);
foreach ($duprs as $duprec) {
// get the list of all ids in {files_reference} that need to be remapped
$dupids = $DB->get_records_select('files_reference', "repositoryid = ? AND referencehash = ? AND id > ?",
array($duprec->repositoryid, $duprec->referencehash, $duprec->minid), '', 'id');
$dupids = array_keys($dupids);
// relink records in {files} that are now referring to a duplicate record
// in {files_reference} to refer to the first one
list($subsql, $subparams) = $DB->get_in_or_equal($dupids);
$DB->set_field_select('files', 'referencefileid', $duprec->minid, "referencefileid $subsql", $subparams);
// and finally remove all orphaned records from {files_reference}
$DB->delete_records_list('files_reference', 'id', $dupids);
}
$duprs->close();
upgrade_main_savepoint(true, 2012060100.03);
}
return true;
}
version.php
+1 -1
View File
@@ -30,7 +30,7 @@
defined('MOODLE_INTERNAL') || die();
$version = 2012060100.02; // YYYYMMDD = weekly release date of this DEV branch
$version = 2012060100.03; // YYYYMMDD = weekly release date of this DEV branch
// RR = release increments - 00 in DEV branches
// .XX = incremental changes