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MDL-27982 add unsigned removal for mysql

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Petr Skoda 2012-02-29 10:27:41 +01:00 committed by Eloy Lafuente (stronk7)
parent e9e4a4a672
commit 7385cc000e
1 changed files with 52 additions and 0 deletions
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52
lib/db/upgradelib.php
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@ -31,3 +31,55 @@
defined('MOODLE_INTERNAL') || die();
/**
* Remove all signed numbers from current database - mysql only.
*/
function upgrade_mysql_fix_unsigned_columns() {
// we are not using standard API for changes of column
// because everything 'signed'-related will be removed soon
// if anybody already has numbers higher than signed limit the execution stops
// and tables must be fixed manually before continuing upgrade
global $DB;
if ($DB->get_dbfamily() !== 'mysql') {
return;
}
$pbar = new progress_bar('mysqlconvertunsigned', 500, true);
$prefix = $DB->get_prefix();
$tables = $DB->get_tables();
$tablecount = count($tables);
$i = 0;
foreach ($tables as $table) {
$i++;
// set appropriate timeout - 5 minutes per milion of records should be enough, min 60 minutes just in case
$count = $DB->count_records($table, array());
$timeout = ($count/1000000)*5*60;
$timeout = ($timeout < 60*60) ? 60*60 : (int)$timeout;
$sql = "SHOW COLUMNS FROM `{{$table}}`";
$rs = $DB->get_recordset_sql($sql);
foreach ($rs as $column) {
upgrade_set_timeout($timeout);
$column = (object)array_change_key_case((array)$column, CASE_LOWER);
if (stripos($column->type, 'unsigned') !== false) {
$type = preg_replace('/unsigned/i', 'signed', $column->type);
$notnull = ($column->null === 'NO') ? 'NOT NULL' : 'NULL';
$default = !is_null($column->default) ? "DEFAULT '$column->default'" : '';
$autoinc = (stripos($column->extra, 'auto_increment') !== false) ? 'AUTO_INCREMENT' : '';
// primary and unique not necessary here, change_database_structure does not add prefix
$sql = "ALTER TABLE `{$prefix}$table` MODIFY COLUMN `$column->field` $type $notnull $default $autoinc";
$DB->change_database_structure($sql);
}
}
$rs->close();
$pbar->update($i, $tablecount, "Converted unsigned columns in MySQL database - $i/$tablecount.");
}
}