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MDL-44191 hack around MySQL 5.6 inability to lower auto_increment

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This commit is contained in:
Petr Škoda
2014-03-14 11:31:43 +08:00
parent c0e88129d1
commit 5d4c82560b
2 changed files with 62 additions and 1 deletions
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lib/testing/classes/util.php
+60
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@@ -570,7 +570,67 @@ abstract class testing_util {
$empties = self::guess_unmodified_empty_tables();
$borkedmysql = false;
if ($DB->get_dbfamily() === 'mysql') {
$version = $DB->get_server_info();
if (version_compare($version['version'], '5.6.0') == 1 and version_compare($version['version'], '5.6.16') == -1) {
// Everything that comes from Oracle is evil!
//
// See http://dev.mysql.com/doc/refman/5.6/en/alter-table.html
// You cannot reset the counter to a value less than or equal to to the value that is currently in use.
//
// From 5.6.16 release notes:
// InnoDB: The ALTER TABLE INPLACE algorithm would fail to decrease the auto-increment value.
// (Bug #17250787, Bug #69882)
$borkedmysql = true;
} else if (version_compare($version['version'], '10.0.0') == 1) {
// And MariaDB is no better!
// Let's hope they pick the patch sometime later...
$borkedmysql = true;
}
}
if ($borkedmysql) {
$mysqlsequences = array();
$prefix = $DB->get_prefix();
$rs = $DB->get_recordset_sql("SHOW TABLE STATUS LIKE ?", array($prefix.'%'));
foreach ($rs as $info) {
$table = strtolower($info->name);
if (strpos($table, $prefix) !== 0) {
// Incorrect table match caused by _ char.
continue;
}
if (!is_null($info->auto_increment)) {
$table = preg_replace('/^'.preg_quote($prefix, '/').'/', '', $table);
$mysqlsequences[$table] = $info->auto_increment;
}
}
}
foreach ($data as $table => $records) {
if ($borkedmysql) {
if (empty($records) and isset($empties[$table])) {
continue;
}
if (isset($structure[$table]['id']) and $structure[$table]['id']->auto_increment) {
$current = $DB->get_records($table, array(), 'id ASC');
if ($current == $records) {
if (isset($mysqlsequences[$table]) and $mysqlsequences[$table] == $structure[$table]['id']->auto_increment) {
continue;
}
}
}
// Use TRUNCATE as a workaround and reinsert everything.
$DB->delete_records($table, null);
foreach ($records as $record) {
$DB->import_record($table, $record, false, true);
}
continue;
}
if (empty($records)) {
if (isset($empties[$table])) {
// table was not modified and is empty