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MDL-66864 upgrade: Delete non-mutual contacts in chunks.

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This commit is contained in:
Mikhail Golenkov
2019-10-07 16:28:16 +11:00
parent 8b89ab5798
commit bf61d3f2b7
1 changed files with 12 additions and 10 deletions
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lib/db/upgrade.php
+12 -10
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@@ -2028,16 +2028,18 @@ function xmldb_main_upgrade($oldversion) {
if ($oldversion < 2018092800.02) {
// Delete any contacts that are not mutual (meaning they both haven't added each other).
$sql = "SELECT c1.id
FROM {message_contacts} c1
LEFT JOIN {message_contacts} c2
ON c1.userid = c2.contactid
AND c1.contactid = c2.userid
WHERE c2.id IS NULL";
if ($contacts = $DB->get_records_sql($sql)) {
list($insql, $inparams) = $DB->get_in_or_equal(array_keys($contacts));
$DB->delete_records_select('message_contacts', "id $insql", $inparams);
}
do {
$sql = "SELECT c1.id
FROM {message_contacts} c1
LEFT JOIN {message_contacts} c2
ON c1.userid = c2.contactid
AND c1.contactid = c2.userid
WHERE c2.id IS NULL";
if ($contacts = $DB->get_records_sql($sql, null, 0, 1000)) {
list($insql, $inparams) = $DB->get_in_or_equal(array_keys($contacts));
$DB->delete_records_select('message_contacts', "id $insql", $inparams);
}
} while ($contacts);
upgrade_main_savepoint(true, 2018092800.02);
}