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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Quma; |
| 6 | |
| 7 | use Celema\Quma\Exception\UnexpectedResultCount; |
| 8 | use Celema\Quma\Hydration\Hydrator; |
| 9 | use Closure; |
| 10 | use Generator; |
| 11 | use InvalidArgumentException; |
| 12 | use JsonException; |
| 13 | use PDO; |
| 14 | use PDOException; |
| 15 | use PDOStatement; |
| 16 | |
| 17 | /** @api */ |
| 18 | class Query |
| 19 | { |
| 20 | // Matches multi line single and double quotes and handles \' \" escapes |
| 21 | public const string PATTERN_STRING = '/([\'"])(?:\\\1|[\s\S])*?\1/'; |
| 22 | |
| 23 | // PostgreSQL blocks delimited with $$ |
| 24 | public const string PATTERN_BLOCK = '/(\$\$)[\s\S]*?\1/'; |
| 25 | |
| 26 | // Multi line comments /* */ |
| 27 | public const string PATTERN_COMMENT_MULTI = '/\/\*([\s\S]*?)\*\//'; |
| 28 | |
| 29 | // Single line comments -- |
| 30 | public const string PATTERN_COMMENT_SINGLE = '/--.*$/m'; |
| 31 | |
| 32 | protected PDOStatement $stmt; |
| 33 | protected bool $executed = false; |
| 34 | protected ?Hydrator $hydrator = null; |
| 35 | |
| 36 | /** The connection the statement was prepared on. */ |
| 37 | private PDO $pdo; |
| 38 | |
| 39 | public function __construct( |
| 40 | protected Database $db, |
| 41 | protected string $query, |
| 42 | protected Args $args, |
| 43 | protected ?string $sourcePath = null, |
| 44 | ) { |
| 45 | $this->prepare($this->db->getConn()); |
| 46 | |
| 47 | if ($this->db->debug) { |
| 48 | Debug::query($this->db, $this->query, $this->args, $this->sourcePath); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | public function __toString(): string |
| 53 | { |
| 54 | return $this->interpolate(); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * @template T of object |
| 59 | * |
| 60 | * @param class-string<T>|Closure(array<string, mixed>):class-string<T>|null $map |
| 61 | * @return ($map is null ? array<array-key, mixed> : T) |
| 62 | */ |
| 63 | public function one(string|Closure|null $map = null, ?int $fetchMode = null): array|object |
| 64 | { |
| 65 | $fetchMode = $this->terminalOptions($map, $fetchMode); |
| 66 | $this->executeFresh(); |
| 67 | |
| 68 | try { |
| 69 | $record = $this->fetchArrayRecord($fetchMode); |
| 70 | |
| 71 | if ($record === null) { |
| 72 | throw UnexpectedResultCount::none(); |
| 73 | } |
| 74 | |
| 75 | if ($this->fetchArrayRecord($fetchMode) !== null) { |
| 76 | throw UnexpectedResultCount::multiple(); |
| 77 | } |
| 78 | |
| 79 | return $this->hydrateRecord($record, $map); |
| 80 | } finally { |
| 81 | $this->stmt->closeCursor(); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * @template T of object |
| 87 | * |
| 88 | * @param class-string<T>|Closure(array<string, mixed>):class-string<T>|null $map |
| 89 | * @return ($map is null ? array<array-key, mixed>|null : T|null) |
| 90 | */ |
| 91 | public function first(string|Closure|null $map = null, ?int $fetchMode = null): array|object|null |
| 92 | { |
| 93 | $fetchMode = $this->terminalOptions($map, $fetchMode); |
| 94 | $this->executeFresh(); |
| 95 | |
| 96 | try { |
| 97 | $record = $this->fetchArrayRecord($fetchMode); |
| 98 | |
| 99 | return $record === null ? null : $this->hydrateRecord($record, $map); |
| 100 | } finally { |
| 101 | $this->stmt->closeCursor(); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * @template T of object |
| 107 | * |
| 108 | * @param class-string<T>|Closure(array<string, mixed>):class-string<T>|null $map |
| 109 | * @return ($map is null ? array<array-key, mixed>|null : T|null) |
| 110 | */ |
| 111 | public function fetch(string|Closure|null $map = null, ?int $fetchMode = null): array|object|null |
| 112 | { |
| 113 | $fetchMode = $this->terminalOptions($map, $fetchMode); |
| 114 | $this->executeForFetch(); |
| 115 | |
| 116 | $record = $this->fetchArrayRecord($fetchMode); |
| 117 | |
| 118 | return $record === null ? null : $this->hydrateRecord($record, $map); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * @template T of object |
| 123 | * |
| 124 | * @param class-string<T>|Closure(array<string, mixed>):class-string<T>|null $map |
| 125 | * @return ($map is null ? list<array<array-key, mixed>> : list<T>) |
| 126 | */ |
| 127 | public function all(string|Closure|null $map = null, ?int $fetchMode = null): array |
| 128 | { |
| 129 | $fetchMode = $this->terminalOptions($map, $fetchMode); |
| 130 | $this->executeFresh(); |
| 131 | |
| 132 | try { |
| 133 | $records = $this->fetchAllRecords($fetchMode); |
| 134 | |
| 135 | if ($map === null) { |
| 136 | return $records; |
| 137 | } |
| 138 | |
| 139 | $result = []; |
| 140 | |
| 141 | foreach ($records as $record) { |
| 142 | $result[] = $this->hydrator()->hydrate($record, $map, $this->sourcePath); |
| 143 | } |
| 144 | |
| 145 | return $result; |
| 146 | } finally { |
| 147 | $this->stmt->closeCursor(); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * @template T of object |
| 153 | * |
| 154 | * @param class-string<T>|Closure(array<string, mixed>):class-string<T>|null $map |
| 155 | * @return ($map is null |
| 156 | * ? Generator<int, array<array-key, mixed>, mixed, void> |
| 157 | * : Generator<int, T, mixed, void>) |
| 158 | */ |
| 159 | public function lazy(string|Closure|null $map = null, ?int $fetchMode = null): Generator |
| 160 | { |
| 161 | $fetchMode = $this->terminalOptions($map, $fetchMode); |
| 162 | $this->executeFresh(); |
| 163 | |
| 164 | try { |
| 165 | while (($record = $this->fetchArrayRecord($fetchMode)) !== null) { |
| 166 | if ($map === null) { |
| 167 | yield $record; |
| 168 | |
| 169 | continue; |
| 170 | } |
| 171 | |
| 172 | yield $this->hydrator()->hydrate($record, $map, $this->sourcePath); |
| 173 | } |
| 174 | } finally { |
| 175 | $this->stmt->closeCursor(); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | private function terminalOptions(string|Closure|null $map, ?int $fetchMode): int |
| 180 | { |
| 181 | $mode = $fetchMode ?? ($map === null ? $this->db->getFetchMode() : PDO::FETCH_ASSOC); |
| 182 | |
| 183 | if ($map !== null && $mode !== PDO::FETCH_ASSOC) { |
| 184 | throw new InvalidArgumentException('Hydration requires PDO::FETCH_ASSOC.'); |
| 185 | } |
| 186 | |
| 187 | if (!in_array($mode, [PDO::FETCH_ASSOC, PDO::FETCH_NUM, PDO::FETCH_BOTH, PDO::FETCH_NAMED], true)) { |
| 188 | throw new InvalidArgumentException( |
| 189 | 'Unsupported fetch mode. Use PDO::FETCH_ASSOC, PDO::FETCH_NUM, PDO::FETCH_BOTH, or PDO::FETCH_NAMED.', |
| 190 | ); |
| 191 | } |
| 192 | |
| 193 | return $mode; |
| 194 | } |
| 195 | |
| 196 | private function executeFresh(): void |
| 197 | { |
| 198 | $this->executeStatement(); |
| 199 | $this->executed = false; |
| 200 | } |
| 201 | |
| 202 | private function executeForFetch(): void |
| 203 | { |
| 204 | if (!$this->executed) { |
| 205 | $this->executeStatement(); |
| 206 | $this->executed = true; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | private function executeStatement(): bool |
| 211 | { |
| 212 | $this->useCurrentConnection(); |
| 213 | |
| 214 | try { |
| 215 | $this->stmt->closeCursor(); |
| 216 | |
| 217 | return $this->stmt->execute(); |
| 218 | } catch (PDOException $e) { |
| 219 | $this->fail($this->pdo, $e); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Lets the database verify the connection before it is reused, as the |
| 225 | * failure may mean that the connection was lost. The failed operation |
| 226 | * itself is never retried. |
| 227 | */ |
| 228 | private function fail(PDO $pdo, PDOException $e): never |
| 229 | { |
| 230 | $this->db->markSuspect($pdo); |
| 231 | |
| 232 | throw $e; |
| 233 | } |
| 234 | |
| 235 | /** |
| 236 | * @template T of object |
| 237 | * |
| 238 | * @param array<array-key, mixed> $record |
| 239 | * @param class-string<T>|Closure(array<string, mixed>):class-string<T>|null $map |
| 240 | * @return ($map is null ? array<array-key, mixed> : T) |
| 241 | */ |
| 242 | private function hydrateRecord(array $record, string|Closure|null $map): array|object |
| 243 | { |
| 244 | if ($map === null) { |
| 245 | return $record; |
| 246 | } |
| 247 | |
| 248 | return $this->hydrator()->hydrate($record, $map, $this->sourcePath); |
| 249 | } |
| 250 | |
| 251 | private function hydrator(): Hydrator |
| 252 | { |
| 253 | return $this->hydrator ??= Hydrator::default(); |
| 254 | } |
| 255 | |
| 256 | public function run(): bool |
| 257 | { |
| 258 | $this->executed = false; |
| 259 | |
| 260 | return $this->executeStatement(); |
| 261 | } |
| 262 | |
| 263 | public function len(): int |
| 264 | { |
| 265 | $this->executeFresh(); |
| 266 | |
| 267 | try { |
| 268 | return $this->stmt->rowCount(); |
| 269 | } finally { |
| 270 | $this->stmt->closeCursor(); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * For debugging purposes only. |
| 276 | * |
| 277 | * Replaces any parameter placeholders in a query with the |
| 278 | * value of that parameter and returns the query as string. |
| 279 | * |
| 280 | * Covers most of the cases but is not perfect. |
| 281 | */ |
| 282 | public function interpolate(): string |
| 283 | { |
| 284 | return Debug::interpolate($this->query, $this->args); |
| 285 | } |
| 286 | |
| 287 | private function prepare(PDO $pdo): void |
| 288 | { |
| 289 | try { |
| 290 | $stmt = $pdo->prepare($this->query); |
| 291 | } catch (PDOException $e) { |
| 292 | $this->fail($pdo, $e); |
| 293 | } |
| 294 | |
| 295 | // Only a prepared statement switches the query to the connection; |
| 296 | // otherwise its next execution would not prepare it again. |
| 297 | $this->pdo = $pdo; |
| 298 | $this->stmt = $stmt; |
| 299 | |
| 300 | if ($this->args->count() > 0) { |
| 301 | $this->bindArgs($this->args->get(), $this->args->type()); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /** |
| 306 | * Before an execution, prepares the statement again if the database |
| 307 | * replaced its connection since, for example after the maximum age. The |
| 308 | * statement would otherwise still run on the old connection, outside a |
| 309 | * transaction begun on the new one. |
| 310 | */ |
| 311 | private function useCurrentConnection(): void |
| 312 | { |
| 313 | $pdo = $this->db->getConn(); |
| 314 | |
| 315 | if ($pdo !== $this->pdo) { |
| 316 | $this->prepare($pdo); |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | /** @param array<array-key, mixed> $args */ |
| 321 | protected function bindArgs(array $args, ArgType $argType): void |
| 322 | { |
| 323 | array_walk( |
| 324 | $args, |
| 325 | function (mixed $value, int|string $index) use ($argType): void { |
| 326 | if ($argType === ArgType::Named) { |
| 327 | $arg = ':' . $index; |
| 328 | } else { |
| 329 | $arg = (int) $index + 1; // question mark placeholders are 1-indexed |
| 330 | } |
| 331 | |
| 332 | $this->bindValue($arg, $value); |
| 333 | }, |
| 334 | ); |
| 335 | } |
| 336 | |
| 337 | protected function bindValue(string|int $arg, mixed $value): void |
| 338 | { |
| 339 | switch (gettype($value)) { |
| 340 | case 'boolean': |
| 341 | $this->stmt->bindValue($arg, $value, PDO::PARAM_BOOL); |
| 342 | |
| 343 | break; |
| 344 | |
| 345 | case 'integer': |
| 346 | $this->stmt->bindValue($arg, $value, PDO::PARAM_INT); |
| 347 | |
| 348 | break; |
| 349 | |
| 350 | case 'string': |
| 351 | $this->stmt->bindValue($arg, $value, PDO::PARAM_STR); |
| 352 | |
| 353 | break; |
| 354 | |
| 355 | case 'NULL': |
| 356 | $this->stmt->bindValue($arg, $value, PDO::PARAM_NULL); |
| 357 | |
| 358 | break; |
| 359 | |
| 360 | case 'array': |
| 361 | try { |
| 362 | $json = json_encode($value, JSON_THROW_ON_ERROR); |
| 363 | } catch (JsonException $e) { |
| 364 | throw new InvalidArgumentException( |
| 365 | 'Array parameters must be JSON-encodable.', |
| 366 | previous: $e, |
| 367 | ); |
| 368 | } |
| 369 | |
| 370 | $this->stmt->bindValue($arg, $json, PDO::PARAM_STR); |
| 371 | |
| 372 | break; |
| 373 | |
| 374 | default: |
| 375 | throw new InvalidArgumentException( |
| 376 | 'Only the types bool, int, string, null and array are supported', |
| 377 | ); |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | /** @return array<array-key, mixed>|null */ |
| 382 | protected function fetchArrayRecord(int $fetchMode): ?array |
| 383 | { |
| 384 | try { |
| 385 | return $this->nullIfNot($this->stmt->fetch($fetchMode)); |
| 386 | } catch (PDOException $e) { |
| 387 | $this->fail($this->pdo, $e); |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | /** @return list<array<array-key, mixed>> */ |
| 392 | private function fetchAllRecords(int $fetchMode): array |
| 393 | { |
| 394 | try { |
| 395 | /** |
| 396 | * @mago-expect lint:inline-variable-return Psalm makes this necessary |
| 397 | * @var list<array<array-key, mixed>> $records |
| 398 | */ |
| 399 | $records = $this->stmt->fetchAll($fetchMode); |
| 400 | |
| 401 | return $records; |
| 402 | } catch (PDOException $e) { |
| 403 | $this->fail($this->pdo, $e); |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | /** @return array<array-key, mixed>|null */ |
| 408 | protected function nullIfNot(mixed $value): ?array |
| 409 | { |
| 410 | if (is_array($value)) { |
| 411 | return $value; |
| 412 | } |
| 413 | |
| 414 | return null; |
| 415 | } |
| 416 | } |