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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** @license For full copyright and license information, please see the LICENSE.md file. */ |
| 6 | |
| 7 | namespace App\Core\Engine\Infrastructure\Schema; |
| 8 | |
| 9 | defined('AMMONLY_APP') || exit('Direct script access is forbidden.'); |
| 10 | |
| 11 | use PDO; |
| 12 | |
| 13 | /** |
| 14 | * SqlTableSchemaHelper. |
| 15 | * |
| 16 | * Provides high-performance cached schema introspection for physical database tables. |
| 17 | * |
| 18 | * @package App\Core\Engine\Infrastructure\Schema |
| 19 | */ |
| 20 | final class SqlTableSchemaHelper |
| 21 | { |
| 22 | /** @var array<string, array<string, array{name: string, type: string, is_nullable: bool, default: mixed}>> */ |
| 23 | private static array $schemaCache = []; |
| 24 | |
| 25 | /** |
| 26 | * Inspects and caches columns metadata for a physical database table. |
| 27 | * |
| 28 | * @param PDO $pdo Database connection. |
| 29 | * @param string $tableName Table name. |
| 30 | * @return array<string, array{name: string, type: string, is_nullable: bool, default: mixed}> Columns metadata. |
| 31 | */ |
| 32 | public static function getTableColumns(PDO $pdo, string $tableName): array |
| 33 | { |
| 34 | $cacheKey = spl_object_id($pdo) . ':' . $tableName; |
| 35 | if (isset(self::$schemaCache[$cacheKey])) { |
| 36 | return self::$schemaCache[$cacheKey]; |
| 37 | } |
| 38 | |
| 39 | $columns = []; |
| 40 | try { |
| 41 | $driver = (string) $pdo->getAttribute(PDO::ATTR_DRIVER_NAME); |
| 42 | if ($driver === 'sqlite') { |
| 43 | $columns = self::fetchSqliteColumns($pdo, $tableName); |
| 44 | } else { |
| 45 | $columns = self::fetchMysqlColumns($pdo, $tableName); |
| 46 | } |
| 47 | } catch (\Throwable) { |
| 48 | // Return empty array on missing table or unexpected error |
| 49 | } |
| 50 | |
| 51 | self::$schemaCache[$cacheKey] = $columns; |
| 52 | return $columns; |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Checks if a column exists in a given table. |
| 57 | * |
| 58 | * @param PDO $pdo Database connection. |
| 59 | * @param string $tableName Table name. |
| 60 | * @param string $columnName Column name to verify. |
| 61 | * @return bool True if column exists. |
| 62 | */ |
| 63 | public static function hasColumn(PDO $pdo, string $tableName, string $columnName): bool |
| 64 | { |
| 65 | $cols = self::getTableColumns($pdo, $tableName); |
| 66 | if (isset($cols[$columnName])) { |
| 67 | return true; |
| 68 | } |
| 69 | |
| 70 | if (empty($cols)) { |
| 71 | return self::hasColumnFallback($pdo, $tableName, $columnName); |
| 72 | } |
| 73 | |
| 74 | return false; |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Resets schema cache (for unit tests). |
| 79 | */ |
| 80 | public static function resetCache(): void |
| 81 | { |
| 82 | self::$schemaCache = []; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Introspects columns for SQLite tables using PRAGMA table_info. |
| 87 | * |
| 88 | * @return array<string, array{name: string, type: string, is_nullable: bool, default: mixed}> |
| 89 | */ |
| 90 | private static function fetchSqliteColumns(PDO $pdo, string $tableName): array |
| 91 | { |
| 92 | $columns = []; |
| 93 | $escaped = str_replace('`', '``', $tableName); |
| 94 | $stmt = $pdo->query("PRAGMA table_info(`{$escaped}`)"); |
| 95 | if ($stmt !== false) { |
| 96 | /** @var array<int, array<string, mixed>> $rows */ |
| 97 | $rows = $stmt->fetchAll(PDO::FETCH_ASSOC); |
| 98 | foreach ($rows as $row) { |
| 99 | $fieldName = (string) ($row['name'] ?? ''); |
| 100 | if ($fieldName === '') { |
| 101 | continue; |
| 102 | } |
| 103 | $columns[$fieldName] = [ |
| 104 | 'name' => $fieldName, |
| 105 | 'type' => (string) ($row['type'] ?? ''), |
| 106 | 'is_nullable' => ((int) ($row['notnull'] ?? 0)) === 0, |
| 107 | 'default' => $row['dflt_value'] ?? null, |
| 108 | ]; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | return $columns; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Introspects columns for MySQL tables using SHOW COLUMNS. |
| 117 | * |
| 118 | * @return array<string, array{name: string, type: string, is_nullable: bool, default: mixed}> |
| 119 | */ |
| 120 | private static function fetchMysqlColumns(PDO $pdo, string $tableName): array |
| 121 | { |
| 122 | $columns = []; |
| 123 | $escaped = str_replace('`', '``', $tableName); |
| 124 | $stmt = $pdo->query("SHOW COLUMNS FROM `{$escaped}`"); |
| 125 | if ($stmt !== false) { |
| 126 | /** @var array<int, array{Field: string, Type: string, Null: string, Default: mixed}> $rows */ |
| 127 | $rows = $stmt->fetchAll(PDO::FETCH_ASSOC); |
| 128 | foreach ($rows as $row) { |
| 129 | $fieldName = (string) $row['Field']; |
| 130 | $columns[$fieldName] = [ |
| 131 | 'name' => $fieldName, |
| 132 | 'type' => (string) $row['Type'], |
| 133 | 'is_nullable' => (string) $row['Null'] === 'YES', |
| 134 | 'default' => $row['Default'], |
| 135 | ]; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | return $columns; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Fallback verification when table metadata cannot be introspected. |
| 144 | */ |
| 145 | private static function hasColumnFallback(PDO $pdo, string $tableName, string $columnName): bool |
| 146 | { |
| 147 | try { |
| 148 | $stmt = $pdo->prepare("SELECT `{$columnName}` FROM `{$tableName}` LIMIT 0"); |
| 149 | $stmt->execute(); |
| 150 | |
| 151 | return true; |
| 152 | } catch (\Throwable) { |
| 153 | return false; |
| 154 | } |
| 155 | } |
| 156 | } |