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removing duplicate entries in grade_grades prior to adding unique key

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toyomoyo 2007-11-14 05:07:33 +00:00
parent cccade627d
commit 5e900da1ce
1 changed files with 26 additions and 0 deletions
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26
lib/db/upgrade.php
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@ -2587,6 +2587,32 @@ function xmldb_main_upgrade($oldversion=0) {
if ($result && $oldversion < 2007101502) {
/// try to remove duplicate entries
$SQL = "SELECT id, userid, itemid
FROM {$CFG->prefix}grade_grades
GROUP BY userid, itemid
HAVING COUNT( * ) >1";
// duplicates found
if ($dups = get_records_sql($SQL)) {
// for each set of userid, itemid
foreach ($dups as $dup) {
if ($thisdups = get_records_sql("SELECT id,id FROM {$CFG->prefix}grade_grades
WHERE itemid = $dup->itemid AND userid = $dup->userid
ORDER BY timemodified DESC")) {
$processed = 0; // keep the first one
foreach ($thisdups as $thisdup) {
if ($processed) {
// remove the duplicates
delete_records('grade_grades', 'id', $thisdup->id);
}
$processed++;
}
}
}
}
/// Define key userid-itemid (unique) to be added to grade_grades
$table = new XMLDBTable('grade_grades');
$key = new XMLDBKey('userid-itemid');