Completed
Pull Request — master (#4246)
by Axel
05:47 queued 01:11
created

CharsetRecodeHelper::isRequired()   A

Complexity

Conditions 1
Paths 1

Size

Total Lines 6
Code Lines 2

Duplication

Lines 0
Ratio 0 %

Importance

Changes 1
Bugs 0 Features 0
Metric Value
cc 1
eloc 2
c 1
b 0
f 0
nc 1
nop 0
dl 0
loc 6
rs 10
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<?php
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declare(strict_types=1);
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/*
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 * This file is part of the Zikula package.
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 *
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 * Copyright Zikula - https://ziku.la/
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace Zikula\Bundle\CoreBundle\Doctrine\Helper;
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use Doctrine\DBAL\Connection;
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use Doctrine\DBAL\Driver\AbstractMySQLDriver;
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class CharsetRecodeHelper
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{
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    /**
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     * @var Connection
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     */
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    private $conn;
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    public function __construct(
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        Connection $connection
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    ) {
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        $this->conn = $connection;
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    }
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    private function isRequired(): bool
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    {
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        $driver = $this->conn->getDriver();
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        // recoding utf8 to utf8mb4 is only required for mysql
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        return $driver instanceof AbstractMySQLDriver;
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    }
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    public function getCommands(): array
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    {
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        if (!$this->isRequired()) {
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            return [];
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        }
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        // the following is based on
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        // https://dba.stackexchange.com/questions/8239/how-to-easily-convert-utf8-tables-to-utf8mb4-in-mysql-5-5#answer-104866
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        $dbName = $this->conn->getDatabase();
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        $tableFilter = 'table_schema LIKE "' . $dbName . '"';
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        $commands = [];
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        $this->conn->executeQuery('use information_schema;');
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        // database level
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        $rows = $this->retrieveCommands('
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            SELECT CONCAT("ALTER DATABASE `",table_schema,"` CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;") AS _sql 
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            FROM `TABLES`
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            WHERE ' . $tableFilter . '
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            GROUP BY table_schema;
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        ');
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        $commands = array_merge($commands, $rows);
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        // table level
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        $rows = $this->retrieveCommands('
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            SELECT CONCAT("ALTER TABLE `",table_schema,"`.`",table_name,"` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;") AS _sql  
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            FROM `TABLES`
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            WHERE ' . $tableFilter . '
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            GROUP BY table_schema, table_name;
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        ');
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        $commands = array_merge($commands, $rows);
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        // column level
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        $rows = $this->retrieveCommands('
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            SELECT CONCAT("ALTER TABLE `",table_schema,"`.`",table_name, "` CHANGE `",column_name,"` `",column_name,"` ",data_type,"(",character_maximum_length,") CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci",IF(is_nullable="YES"," NULL"," NOT NULL"),";") AS _sql 
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            FROM `COLUMNS`
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            WHERE ' . $tableFilter . '
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            AND data_type IN (\'varchar\', \'char\');
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        ');
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        $commands = array_merge($commands, $rows);
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        $rows = $this->retrieveCommands('
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            SELECT CONCAT("ALTER TABLE `",table_schema,"`.`",table_name, "` CHANGE `",column_name,"` `",column_name,"` ",data_type," CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci",IF(is_nullable="YES"," NULL"," NOT NULL"),";") AS _sql 
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            FROM `COLUMNS`
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            WHERE ' . $tableFilter . '
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            AND data_type IN (\'text\', \'tinytext\', \'mediumtext\', \'longtext\');
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        ');
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        $commands = array_merge($commands, $rows);
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        $this->conn->executeQuery('use ' . $dbName . ';');
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        return $commands;
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    }
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    private function retrieveCommands(string $sql): array
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    {
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        $result = [];
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        $stmt = $this->conn->executeQuery($sql);
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        while ($row = $stmt->fetch()) {
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            $result[] = $row['_sql'];
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        }
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        return $result;
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    }
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}
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