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<?php
/**
* @link https://www.humhub.org/
* @copyright Copyright (c) 2020 HumHub GmbH & Co. KG
* @license https://www.humhub.com/licences
*/
namespace humhub\components\db;
use PDOException;
use yii\db\mysql\Schema;
/**
* Class MysqlSchema
*
* This class is a hotfix for Yii2 bug #18207 and will be removed with HumHub 1.7+.
*
* @see https://github.com/yiisoft/yii2/issues/18207
* @expectedDeprecation 1.7
* @package humhub\components\db
*/
class MysqlSchema extends Schema
{
/**
* Collects the foreign key column details for the given table.
* @param TableSchema $table the table metadata
* @throws \Exception
*/
protected function findConstraints($table)
{
$sql = <<<'SQL'
SELECT
`kcu`.`CONSTRAINT_NAME` AS `constraint_name`,
`kcu`.`COLUMN_NAME` AS `column_name`,
`kcu`.`REFERENCED_TABLE_NAME` AS `referenced_table_name`,
`kcu`.`REFERENCED_COLUMN_NAME` AS `referenced_column_name`
FROM `information_schema`.`REFERENTIAL_CONSTRAINTS` AS `rc`
JOIN `information_schema`.`KEY_COLUMN_USAGE` AS `kcu` ON
(
`kcu`.`CONSTRAINT_CATALOG` = `rc`.`CONSTRAINT_CATALOG` OR
(`kcu`.`CONSTRAINT_CATALOG` IS NULL AND `rc`.`CONSTRAINT_CATALOG` IS NULL)
) AND
`kcu`.`CONSTRAINT_SCHEMA` = `rc`.`CONSTRAINT_SCHEMA` AND
`kcu`.`CONSTRAINT_NAME` = `rc`.`CONSTRAINT_NAME`
WHERE `rc`.`CONSTRAINT_SCHEMA` = database() AND `kcu`.`TABLE_SCHEMA` = database()
AND `rc`.`TABLE_NAME` = :tableName AND `kcu`.`TABLE_NAME` = :tableName1
SQL;
try {
$rows = $this->db->createCommand($sql, [':tableName' => $table->name, ':tableName1' => $table->name])->queryAll();
$constraints = [];
foreach ($rows as $row) {
$constraints[$row['constraint_name']]['referenced_table_name'] = $row['referenced_table_name'];
$constraints[$row['constraint_name']]['columns'][$row['column_name']] = $row['referenced_column_name'];
}
$table->foreignKeys = [];
foreach ($constraints as $name => $constraint) {
$table->foreignKeys[$name] = array_merge(
[$constraint['referenced_table_name']],
$constraint['columns']
);
}
} catch (\Exception $e) {
$previous = $e->getPrevious();
if (!$previous instanceof PDOException || strpos($previous->getMessage(), 'SQLSTATE[42S02') === false) {
throw $e;
}
// table does not exist, try to determine the foreign keys using the table creation sql
$sql = $this->getCreateTableSql($table);
$regexp = '/FOREIGN KEY\s+\(([^\)]+)\)\s+REFERENCES\s+([^\(^\s]+)\s*\(([^\)]+)\)/mi';
if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
foreach ($matches as $match) {
$fks = array_map('trim', explode(',', str_replace('`', '', $match[1])));
$pks = array_map('trim', explode(',', str_replace('`', '', $match[3])));
$constraint = [str_replace('`', '', $match[2])];
foreach ($fks as $k => $name) {
$constraint[$name] = $pks[$k];
}
$table->foreignKeys[md5(serialize($constraint))] = $constraint;
}
$table->foreignKeys = array_values($table->foreignKeys);
}
}
}
}
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