Migration to convert database, table and column charset to utf8mb4 (for Emoji support)

Version20141205212145.php

<?php

namespace HeyUpdate\Application\Migrations;

use Doctrine\DBAL\Migrations\AbstractMigration;
use Doctrine\DBAL\Schema\Schema;

class Version20141205212145 extends AbstractMigration
{
    public function up(Schema $schema)
    {
        $platform = $this->connection->getDatabasePlatform();

        $this->addSql(sprintf('ALTER DATABASE %s CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci', $this->connection->getDatabase()));

        foreach ($schema->getTables() as $table) {
            if ($table->getName() === 'migration_versions') {
                // Ignore the migrations table
                continue;
            }

            $this->addSql(sprintf('ALTER TABLE %s CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci', $table->getName()));

            foreach ($table->getColumns() as $column) {
                if (in_array($column->getType()->getName(), array('string', 'text'))) {
                    $this->addSql(sprintf('ALTER TABLE %s CHANGE %s %s %s CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci',
                        $table->getName(),
                        $column->getName(),
                        $column->getName(),
                        $column->getType()->getSQLDeclaration(array(
                            'length' => $column->getLength()
                        ), $platform)
                    ));
                }
            }

            $this->addSql(sprintf('REPAIR TABLE %s', $table->getName()));
            $this->addSql(sprintf('OPTIMIZE TABLE %s', $table->getName()));
        }
    }

    public function down(Schema $schema)
    {
    }
}