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<?php
namespace Doctrine\DBAL\Platforms;
use Doctrine\DBAL\Types\JsonType;
use function sprintf;
/**
* Provides the behavior, features and SQL dialect of the MariaDB 10.4 (10.4.6 GA) database platform.
*
* Extend deprecated MariaDb1027Platform to ensure correct functions used in MySQLSchemaManager which
* tests for MariaDb1027Platform not MariaDBPlatform.
*
* @deprecated This class will be merged with {@see MariaDBPlatform} in 4.0 because support for MariaDB
* releases prior to 10.4.3 will be dropped.
*/
class MariaDb1043Platform extends MariaDb1027Platform
{
/**
* Use JSON rather than LONGTEXT for json columns. Since it is not a true native type, do not override
* hasNativeJsonType() so the DC2Type comment will still be set.
*
* {@inheritDoc}
*/
public function getJsonTypeDeclarationSQL(array $column): string
{
return 'JSON';
}
/**
* {@inheritDoc}
*
* From version 10.4.3, MariaDb aliases JSON to LONGTEXT and adds a constraint CHECK (json_valid). Reverse
* this process when introspecting tables.
*
* @see https://mariadb.com/kb/en/information-schema-check_constraints-table/
* @see https://mariadb.com/kb/en/json-data-type/
* @see https://jira.mariadb.org/browse/MDEV-13916
*/
public function getListTableColumnsSQL($table, $database = null): string
{
[$columnTypeSQL, $joinCheckConstraintSQL] = $this->getColumnTypeSQLSnippets();
return sprintf(
<<<SQL
SELECT c.COLUMN_NAME AS Field,
$columnTypeSQL AS Type,
c.IS_NULLABLE AS `Null`,
c.COLUMN_KEY AS `Key`,
c.COLUMN_DEFAULT AS `Default`,
c.EXTRA AS Extra,
c.COLUMN_COMMENT AS Comment,
c.CHARACTER_SET_NAME AS CharacterSet,
c.COLLATION_NAME AS Collation
FROM information_schema.COLUMNS c
$joinCheckConstraintSQL
WHERE c.TABLE_SCHEMA = %s
AND c.TABLE_NAME = %s
ORDER BY ORDINAL_POSITION ASC;
SQL
,
$this->getDatabaseNameSQL($database),
$this->quoteStringLiteral($table),
);
}
/**
* Generate SQL snippets to reverse the aliasing of JSON to LONGTEXT.
*
* MariaDb aliases columns specified as JSON to LONGTEXT and sets a CHECK constraint to ensure the column
* is valid json. This function generates the SQL snippets which reverse this aliasing i.e. report a column
* as JSON where it was originally specified as such instead of LONGTEXT.
*
* The CHECK constraints are stored in information_schema.CHECK_CONSTRAINTS so JOIN that table.
*
* @return array{string, string}
*/
public function getColumnTypeSQLSnippets(string $tableAlias = 'c'): array
{
if ($this->getJsonTypeDeclarationSQL([]) !== 'JSON') {
return parent::getColumnTypeSQLSnippets($tableAlias);
}
$columnTypeSQL = <<<SQL
IF(
x.CHECK_CLAUSE IS NOT NULL AND $tableAlias.COLUMN_TYPE = 'longtext',
'json',
$tableAlias.COLUMN_TYPE
)
SQL;
$joinCheckConstraintSQL = <<<SQL
LEFT JOIN information_schema.CHECK_CONSTRAINTS x
ON (
$tableAlias.TABLE_SCHEMA = x.CONSTRAINT_SCHEMA
AND $tableAlias.TABLE_NAME = x.TABLE_NAME
AND x.CHECK_CLAUSE = CONCAT('json_valid(`', $tableAlias.COLUMN_NAME , '`)')
)
SQL;
return [$columnTypeSQL, $joinCheckConstraintSQL];
}
/** {@inheritDoc} */
public function getColumnDeclarationSQL($name, array $column)
{
// MariaDb forces column collation to utf8mb4_bin where the column was declared as JSON so ignore
// collation and character set for json columns as attempting to set them can cause an error.
if ($this->getJsonTypeDeclarationSQL([]) === 'JSON' && ($column['type'] ?? null) instanceof JsonType) {
unset($column['collation']);
unset($column['charset']);
}
return parent::getColumnDeclarationSQL($name, $column);
}
}