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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* MySQL collation conversion tool.
*
* @package core
* @copyright 2012 Petr Skoda (http://skodak.org)
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
define('CLI_SCRIPT', true);
require(__DIR__.'/../../config.php');
require_once($CFG->libdir.'/clilib.php'); // cli only functions
if ($DB->get_dbfamily() !== 'mysql') {
cli_error('This function is designed for MySQL databases only!');
}
// now get cli options
list($options, $unrecognized) = cli_get_params(array('help'=>false, 'list'=>false, 'collation'=>false, 'available'=>false),
array('h'=>'help', 'l'=>'list', 'a'=>'available'));
if ($unrecognized) {
$unrecognized = implode("\n ", $unrecognized);
cli_error(get_string('cliunknowoption', 'admin', $unrecognized));
}
$help =
"MySQL collation conversions script.
It is strongly recommended to stop the web server before the conversion.
This script may be executed before the main upgrade - 1.9.x data for example.
Options:
--collation=COLLATION Convert MySQL tables to different collation
-l, --list Show table and column information
-a, --available Show list of available collations
-h, --help Print out this help
Example:
\$ sudo -u www-data /usr/bin/php admin/cli/mysql_collation.php --collation=utf8mb4_unicode_ci
";
if (!empty($options['collation'])) {
$collations = mysql_get_collations();
$collation = clean_param($options['collation'], PARAM_ALPHANUMEXT);
$collation = strtolower($collation);
if (!isset($collations[$collation])) {
cli_error("Error: collation '$collation' is not available on this server!");
}
$collationinfo = explode('_', $collation);
$charset = reset($collationinfo);
$engine = strtolower($DB->get_dbengine());
// Do checks for utf8mb4.
if (strpos($collation, 'utf8mb4') === 0) {
// Do we have the right engine?
if ($engine !== 'innodb' && $engine !== 'xtradb') {
cli_error("Error: '$collation' requires InnoDB or XtraDB set as the engine.");
}
// Are we using Barracuda?
if ($DB->get_row_format() != 'Barracuda') {
// Try setting it here.
try {
$DB->execute("SET GLOBAL innodb_file_format=Barracuda");
} catch (dml_exception $e) {
cli_error("Error: '$collation' requires the file format to be set to Barracuda.
An attempt was made to change the format, but it failed. Please try doing this manually.");
}
echo "GLOBAL SETTING: innodb_file_format changed to Barracuda\n";
}
// Is one file per table being used?
if (!$DB->is_file_per_table_enabled()) {
try {
$DB->execute("SET GLOBAL innodb_file_per_table=1");
} catch (dml_exception $e) {
cli_error("Error: '$collation' requires the setting 'innodb_file_per_table' be set to 'ON'.
An attempt was made to change the format, but it failed. Please try doing this manually.");
}
echo "GLOBAL SETTING: innodb_file_per_table changed to 1\n";
}
// Is large prefix set?
if (!$DB->is_large_prefix_enabled()) {
try {
$DB->execute("SET GLOBAL innodb_large_prefix=1");
} catch (dml_exception $e) {
cli_error("Error: '$collation' requires the setting 'innodb_large_prefix' be set to 'ON'.
An attempt was made to change the format, but it failed. Please try doing this manually.");
}
echo "GLOBAL SETTING: innodb_large_prefix changed to 1\n";
}
}
$sql = "SHOW VARIABLES LIKE 'collation_database'";
if (!$dbcollation = $DB->get_record_sql($sql)) {
cli_error("Error: Could not access collation information on the database.");
}
$sql = "SHOW VARIABLES LIKE 'character_set_database'";
if (!$dbcharset = $DB->get_record_sql($sql)) {
cli_error("Error: Could not access character set information on the database.");
}
if ($dbcollation->value !== $collation || $dbcharset->value !== $charset) {
// Try to convert the DB.
echo "Converting database to '$collation' for $CFG->wwwroot:\n";
$sql = "ALTER DATABASE $CFG->dbname DEFAULT CHARACTER SET $charset DEFAULT COLLATE = $collation";
try {
$DB->change_database_structure($sql);
} catch (exception $e) {
cli_error("Error: Tried to alter the database with no success. Please try manually changing the database
to the new collation and character set and then run this script again.");
}
echo "DATABASE CONVERTED\n";
}
echo "Converting tables and columns to '$collation' for $CFG->wwwroot:\n";
$prefix = $DB->get_prefix();
$prefix = str_replace('_', '\\_', $prefix);
$sql = "SHOW TABLE STATUS WHERE Name LIKE BINARY '$prefix%'";
$rs = $DB->get_recordset_sql($sql);
$converted = 0;
$skipped = 0;
$errors = 0;
foreach ($rs as $table) {
echo str_pad($table->name, 40). " - ";
if ($table->collation === $collation) {
echo "NO CHANGE\n";
$skipped++;
} else {
try {
$DB->change_database_structure("ALTER TABLE $table->name CONVERT TO CHARACTER SET $charset COLLATE $collation");
echo "CONVERTED\n";
$converted++;
} catch (ddl_exception $e) {
$result = mysql_set_row_format($table->name, $charset, $collation, $engine);
if ($result) {
echo "CONVERTED\n";
$converted++;
} else {
// We don't know what the problem is. Stop the conversion.
cli_error("Error: Tried to convert $table->name, but there was a problem. Please check the details of this
table and try again.");
die();
}
}
}
$sql = "SHOW FULL COLUMNS FROM $table->name WHERE collation IS NOT NULL";
$rs2 = $DB->get_recordset_sql($sql);
foreach ($rs2 as $column) {
$column = (object)array_change_key_case((array)$column, CASE_LOWER);
echo ' '.str_pad($column->field, 36). " - ";
if ($column->collation === $collation) {
echo "NO CHANGE\n";
$skipped++;
continue;
}
// Check for utf8mb4 collation.
$rowformat = $DB->get_row_format_sql($engine, $collation);
if ($column->type === 'tinytext' or $column->type === 'mediumtext' or $column->type === 'text' or $column->type === 'longtext') {
$notnull = ($column->null === 'NO') ? 'NOT NULL' : 'NULL';
$default = (!is_null($column->default) and $column->default !== '') ? "DEFAULT '$column->default'" : '';
// primary, unique and inc are not supported for texts
$sql = "ALTER TABLE $table->name
MODIFY COLUMN $column->field $column->type
CHARACTER SET $charset
COLLATE $collation $notnull $default";
$DB->change_database_structure($sql);
} else if (strpos($column->type, 'varchar') === 0) {
$notnull = ($column->null === 'NO') ? 'NOT NULL' : 'NULL';
$default = !is_null($column->default) ? "DEFAULT '$column->default'" : '';
if ($rowformat != '') {
$sql = "ALTER TABLE $table->name $rowformat";
$DB->change_database_structure($sql);
}
$sql = "ALTER TABLE $table->name
MODIFY COLUMN $column->field $column->type
CHARACTER SET $charset
COLLATE $collation $notnull $default";
$DB->change_database_structure($sql);
} else {
echo "ERROR (unknown column type: $column->type)\n";
$errors++;
continue;
}
echo "CONVERTED\n";
$converted++;
}
$rs2->close();
}
$rs->close();
echo "Converted: $converted, skipped: $skipped, errors: $errors\n";
exit(0); // success
} else if (!empty($options['list'])) {
echo "List of tables for $CFG->wwwroot:\n";
$prefix = $DB->get_prefix();
$prefix = str_replace('_', '\\_', $prefix);
$sql = "SHOW TABLE STATUS WHERE Name LIKE BINARY '$prefix%'";
$rs = $DB->get_recordset_sql($sql);
$counts = array();
foreach ($rs as $table) {
if (isset($counts[$table->collation])) {
$counts[$table->collation]++;
} else {
$counts[$table->collation] = 1;
}
echo str_pad($table->name, 40);
echo $table->collation. "\n";
$collations = mysql_get_column_collations($table->name);
foreach ($collations as $columname=>$collation) {
if (isset($counts[$collation])) {
$counts[$collation]++;
} else {
$counts[$collation] = 1;
}
echo ' ';
echo str_pad($columname, 36);
echo $collation. "\n";
}
}
$rs->close();
echo "\n";
echo "Table collations summary for $CFG->wwwroot:\n";
foreach ($counts as $collation => $count) {
echo "$collation: $count\n";
}
exit(0); // success
} else if (!empty($options['available'])) {
echo "List of available MySQL collations for $CFG->wwwroot:\n";
$collations = mysql_get_collations();
foreach ($collations as $collation) {
echo " $collation\n";
}
die;
} else {
echo $help;
die;
}
// ========== Some functions ==============
function mysql_get_collations() {
global $DB;
$collations = array();
$sql = "SHOW COLLATION
WHERE Collation LIKE 'utf8\_%' AND Charset = 'utf8'
OR Collation LIKE 'utf8mb4\_%' AND Charset = 'utf8mb4'";
$rs = $DB->get_recordset_sql($sql);
foreach ($rs as $collation) {
$collations[$collation->collation] = $collation->collation;
}
$rs->close();
$collation = $DB->get_dbcollation();
if (isset($collations[$collation])) {
$collations[$collation] .= ' (default)';
}
return $collations;
}
function mysql_get_column_collations($tablename) {
global $DB;
$collations = array();
$sql = "SELECT column_name, collation_name
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_schema = DATABASE() AND table_name = ? AND collation_name IS NOT NULL";
$rs = $DB->get_recordset_sql($sql, array($tablename));
foreach($rs as $record) {
$collations[$record->column_name] = $record->collation_name;
}
$rs->close();
return $collations;
}
function mysql_set_row_format($tablename, $charset, $collation, $engine) {
global $DB;
$sql = "SELECT row_format
FROM INFORMATION_SCHEMA.TABLES
WHERE table_schema = DATABASE() AND table_name = ?";
$rs = $DB->get_record_sql($sql, array($tablename));
if ($rs) {
if ($rs->row_format == 'Compact' || $rs->row_format == 'Redundant') {
$rowformat = $DB->get_row_format_sql($engine, $collation);
// Try to convert to compressed format and then try updating the collation again.
$DB->change_database_structure("ALTER TABLE $tablename $rowformat");
$DB->change_database_structure("ALTER TABLE $tablename CONVERT TO CHARACTER SET $charset COLLATE $collation");
} else {
// Row format may not be the problem. Can not diagnose problem. Send fail reply.
return false;
}
} else {
return false;
}
return true;
}