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| 1 | <?php |
| 2 | /** |
| 3 | * SQL_Generator file. |
| 4 | * |
| 5 | * @package wpcomsh |
| 6 | */ |
| 7 | |
| 8 | namespace Imports; |
| 9 | |
| 10 | use WP_Error; |
| 11 | |
| 12 | /** |
| 13 | * Generate a SQL file from metadata. |
| 14 | */ |
| 15 | class SQL_Generator { |
| 16 | const OUTPUT_TYPE_FILE = 0; |
| 17 | const OUTPUT_TYPE_STRING = 1; |
| 18 | const OUTPUT_TYPE_STDOUT = 2; |
| 19 | |
| 20 | const DEFAULT_CHARSET = 'utf8mb4'; |
| 21 | const DEFAULT_COLLATION = 'utf8mb4_unicode_520_ci'; |
| 22 | |
| 23 | /** |
| 24 | * The output type. |
| 25 | * |
| 26 | * @var int |
| 27 | */ |
| 28 | private int $output_mode = self::OUTPUT_TYPE_STRING; |
| 29 | |
| 30 | /** |
| 31 | * The output file. |
| 32 | * |
| 33 | * @var string|resource|null |
| 34 | */ |
| 35 | private $output_handle = ''; |
| 36 | |
| 37 | /** |
| 38 | * The current table. |
| 39 | * |
| 40 | * @var ?string |
| 41 | */ |
| 42 | private $current_table = null; |
| 43 | |
| 44 | /** |
| 45 | * The current insert index. |
| 46 | * |
| 47 | * @var int |
| 48 | */ |
| 49 | private $current_insert_index = 0; |
| 50 | |
| 51 | /** |
| 52 | * Whether the dump has started. |
| 53 | * |
| 54 | * @var bool |
| 55 | */ |
| 56 | private $started = false; |
| 57 | |
| 58 | /** |
| 59 | * Whether to use transactions. |
| 60 | * |
| 61 | * @var bool |
| 62 | */ |
| 63 | private $transaction = true; |
| 64 | |
| 65 | /** |
| 66 | * The collation. |
| 67 | * |
| 68 | * @var ?string |
| 69 | */ |
| 70 | private $collation = null; |
| 71 | |
| 72 | /** |
| 73 | * The collation. |
| 74 | * |
| 75 | * @var string |
| 76 | */ |
| 77 | private $charset = self::DEFAULT_CHARSET; |
| 78 | |
| 79 | /** |
| 80 | * SQL_Generator destructor. |
| 81 | */ |
| 82 | public function __destruct() { |
| 83 | $this->reset(); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * MySQL `--` comment. |
| 88 | * |
| 89 | * @param string $comment The comment. |
| 90 | * |
| 91 | * @return void |
| 92 | */ |
| 93 | public function comment( string $comment ) { |
| 94 | $this->output( "-- {$comment}" ); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * An empty line. |
| 99 | * |
| 100 | * @return void |
| 101 | */ |
| 102 | public function nl() { |
| 103 | $this->output(); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * An SQL query. |
| 108 | * |
| 109 | * @param string $query The query. |
| 110 | * @param bool $nl Whether to add a new line at the end. |
| 111 | * |
| 112 | * @return void |
| 113 | */ |
| 114 | public function output( string $query = '', $nl = true ) { |
| 115 | if ( $nl ) { |
| 116 | $query .= "\n"; |
| 117 | } |
| 118 | |
| 119 | if ( $this->output_mode === self::OUTPUT_TYPE_STDOUT ) { |
| 120 | // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped |
| 121 | echo $query; |
| 122 | } elseif ( $this->output_mode === self::OUTPUT_TYPE_STRING ) { |
| 123 | $this->output_handle .= $query; |
| 124 | } elseif ( $this->output_mode === self::OUTPUT_TYPE_FILE ) { |
| 125 | // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 126 | fwrite( $this->output_handle, $query ); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * A variable assignment. |
| 132 | * |
| 133 | * @param string $variable The variable name. |
| 134 | * @param string $value The variable value. |
| 135 | * @param int $version The MySQL version when the variable was introduced. |
| 136 | * |
| 137 | * @return void |
| 138 | * |
| 139 | * @see https://dev.mysql.com/doc/refman/8.2/en/set-variable.html |
| 140 | */ |
| 141 | public function var_assignment( string $variable, string $value, int $version = 40101 ) { |
| 142 | $this->output( "/*!{$version} SET {$variable}={$value} */;" ); |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * A SET statement. |
| 147 | * |
| 148 | * @param string $content The SET statement content. |
| 149 | * @param int $version The MySQL version when the statement was introduced. |
| 150 | * |
| 151 | * @see https://dev.mysql.com/doc/refman/8.2/en/set-statement.html |
| 152 | */ |
| 153 | public function var( string $content, int $version = 40101 ) { |
| 154 | $this->output( "/*!{$version} {$content} */;" ); |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * A three-line comment header. |
| 159 | * |
| 160 | * @param string $title The title. |
| 161 | * |
| 162 | * @return void |
| 163 | */ |
| 164 | public function header( $title ) { |
| 165 | $this->comment( '' ); |
| 166 | $this->comment( $title ); |
| 167 | $this->comment( '' ); |
| 168 | $this->nl(); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Start the dump. This should be called before any other methods. |
| 173 | * |
| 174 | * @param array $options The options. |
| 175 | * |
| 176 | * @return bool|WP_Error |
| 177 | */ |
| 178 | public function start( $options = array() ) { |
| 179 | $defaults = array( |
| 180 | 'charset' => self::DEFAULT_CHARSET, |
| 181 | 'collation' => null, |
| 182 | 'output_file' => null, |
| 183 | 'output_mode' => self::OUTPUT_TYPE_STRING, |
| 184 | 'transaction' => true, |
| 185 | ); |
| 186 | |
| 187 | $options = wp_parse_args( $options, $defaults ); |
| 188 | |
| 189 | // Reset the output. |
| 190 | $this->reset(); |
| 191 | |
| 192 | $this->output_mode = $options['output_mode']; |
| 193 | |
| 194 | if ( $this->output_mode === self::OUTPUT_TYPE_STDOUT ) { |
| 195 | $this->output_handle = null; |
| 196 | } elseif ( $this->output_mode === self::OUTPUT_TYPE_STRING ) { |
| 197 | $this->output_handle = ''; |
| 198 | } elseif ( $this->output_mode === self::OUTPUT_TYPE_FILE ) { |
| 199 | if ( is_dir( $options['output_file'] ) ) { |
| 200 | return new WP_Error( 'output-open-error', 'Output file is a directory.' ); |
| 201 | } |
| 202 | |
| 203 | // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fopen |
| 204 | $file_handle = fopen( $options['output_file'], 'a' ); |
| 205 | |
| 206 | if ( $file_handle === false ) { |
| 207 | return new WP_Error( 'output-open-error', 'Error opening output file.' ); |
| 208 | } |
| 209 | |
| 210 | $this->output_handle = $file_handle; |
| 211 | } |
| 212 | |
| 213 | $this->started = true; |
| 214 | $this->transaction = $options['transaction']; |
| 215 | $this->collation = $options['collation']; |
| 216 | $this->charset = $options['charset']; |
| 217 | |
| 218 | // Start the dump header. |
| 219 | $this->header( 'Playground SQLite MySQL dump' ); |
| 220 | |
| 221 | $this->output( 'SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";' ); |
| 222 | |
| 223 | if ( $this->transaction ) { |
| 224 | $this->output( 'START TRANSACTION;' ); |
| 225 | } |
| 226 | |
| 227 | $this->output( 'SET time_zone = "+00:00";' ); |
| 228 | $this->nl(); |
| 229 | |
| 230 | // Various MySQL settings. |
| 231 | $this->var_assignment( '@OLD_CHARACTER_SET_CLIENT', '@@CHARACTER_SET_CLIENT' ); |
| 232 | $this->var_assignment( '@OLD_CHARACTER_SET_RESULTS', '@@CHARACTER_SET_RESULTS' ); |
| 233 | $this->var_assignment( '@OLD_COLLATION_CONNECTION', '@@COLLATION_CONNECTION ' ); |
| 234 | $this->var( 'SET NAMES ' . $this->charset ); |
| 235 | $this->var_assignment( '@OLD_TIME_ZONE', '@@TIME_ZONE', 40103 ); |
| 236 | $this->var_assignment( 'TIME_ZONE', '\'+00:00\'', 40103 ); |
| 237 | $this->var_assignment( '@OLD_UNIQUE_CHECKS', '@@UNIQUE_CHECKS, UNIQUE_CHECKS=0', 40014 ); |
| 238 | $this->var_assignment( '@OLD_FOREIGN_KEY_CHECKS', '@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0', 40014 ); |
| 239 | $this->var_assignment( '@OLD_SQL_MODE', '@@SQL_MODE, SQL_MODE=\'NO_AUTO_VALUE_ON_ZERO\'' ); |
| 240 | $this->var_assignment( '@OLD_SQL_NOTES', '@@SQL_NOTES, SQL_NOTES=0', 40111 ); |
| 241 | $this->nl(); |
| 242 | |
| 243 | return true; |
| 244 | } |
| 245 | |
| 246 | /** |
| 247 | * End the dump. This should be called after all other methods. |
| 248 | */ |
| 249 | public function end() { |
| 250 | // Not started, return. |
| 251 | if ( ! $this->started ) { |
| 252 | return; |
| 253 | } |
| 254 | |
| 255 | if ( $this->transaction ) { |
| 256 | // End transaction. |
| 257 | $this->output( 'COMMIT;' ); |
| 258 | } |
| 259 | |
| 260 | // Various MySQL settings. |
| 261 | $this->var_assignment( 'TIME_ZONE', '@OLD_TIME_ZONE', 40103 ); |
| 262 | $this->var_assignment( 'SQL_MODE', '@OLD_SQL_MODE' ); |
| 263 | $this->var_assignment( 'FOREIGN_KEY_CHECKS', '@OLD_FOREIGN_KEY_CHECKS', 40014 ); |
| 264 | $this->var_assignment( 'UNIQUE_CHECKS', '@OLD_UNIQUE_CHECKS', 40014 ); |
| 265 | $this->var_assignment( 'CHARACTER_SET_CLIENT', '@OLD_CHARACTER_SET_CLIENT' ); |
| 266 | $this->var_assignment( 'CHARACTER_SET_RESULTS', '@OLD_CHARACTER_SET_RESULTS' ); |
| 267 | $this->var_assignment( 'COLLATION_CONNECTION', '@OLD_COLLATION_CONNECTION' ); |
| 268 | $this->var_assignment( 'SQL_NOTES', '@OLD_SQL_NOTES', 40111 ); |
| 269 | $this->nl(); |
| 270 | $this->comment( 'Dump completed on ' . gmdate( 'Y-m-d H:i:s' ) ); |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * Create a table. |
| 275 | * |
| 276 | * @param string $table_name The table name. |
| 277 | * @param array $types_map The types map. |
| 278 | * @param int $auto_increment The auto increment value. |
| 279 | * @param bool $add_drop Whether to add a DROP TABLE statement. |
| 280 | * |
| 281 | * @return void |
| 282 | */ |
| 283 | public function start_table( string $table_name, array $types_map, int $auto_increment, bool $add_drop = true ) { |
| 284 | $this->start_table_creation( $table_name, $add_drop ); |
| 285 | |
| 286 | $indexes = array(); |
| 287 | $columns = array(); |
| 288 | $primary_keys = array(); |
| 289 | |
| 290 | // Output the columns. |
| 291 | foreach ( $types_map as $column ) { |
| 292 | if ( $column['type'] === 'UNIQUE' || $column['type'] === 'KEY' ) { |
| 293 | $indexes[] = $column; |
| 294 | |
| 295 | continue; |
| 296 | } |
| 297 | |
| 298 | $columns[] = $this->get_column( $column['name'], $column ); |
| 299 | |
| 300 | // Save up the PRIMARY column for later. |
| 301 | if ( $column['primary'] ) { |
| 302 | $primary_keys[] = '`' . $column['name'] . '`'; |
| 303 | continue; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | if ( count( $primary_keys ) ) { |
| 308 | // Add the PRIMARY KEY |
| 309 | $columns[] = 'PRIMARY KEY (' . implode( ',', $primary_keys ) . ')'; |
| 310 | } |
| 311 | |
| 312 | foreach ( $indexes as $index ) { |
| 313 | $index_list = $index['columns']; |
| 314 | $key_type = $index['type'] === 'UNIQUE' ? 'UNIQUE KEY' : 'KEY'; |
| 315 | |
| 316 | // Output the keys. |
| 317 | $columns[] = "{$key_type} `{$index['name']}` {$index_list}"; |
| 318 | } |
| 319 | |
| 320 | if ( count( $columns ) > 0 ) { |
| 321 | $columns[0] = ' ' . $columns[0]; |
| 322 | $this->output( implode( ",\n ", $columns ) ); |
| 323 | } |
| 324 | |
| 325 | $this->end_table_creation( $table_name, $auto_increment ); |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * Start table inserts. Disable keys. |
| 330 | * |
| 331 | * @return void |
| 332 | */ |
| 333 | public function start_table_inserts() { |
| 334 | if ( ! $this->current_table ) { |
| 335 | return; |
| 336 | } |
| 337 | |
| 338 | $this->header( "Dumping data for table `{$this->current_table}`" ); |
| 339 | $this->output( "LOCK TABLES `{$this->current_table}` WRITE;" ); |
| 340 | $this->var( "ALTER TABLE `{$this->current_table}` DISABLE KEYS", 40000 ); |
| 341 | |
| 342 | $this->current_insert_index = 0; |
| 343 | } |
| 344 | |
| 345 | /** |
| 346 | * Generate an INSERT statement. |
| 347 | * |
| 348 | * @param string $field_names The field names. |
| 349 | * @param string $data The data. |
| 350 | * |
| 351 | * @return void |
| 352 | */ |
| 353 | public function table_insert( string $field_names, string $data ) { |
| 354 | if ( ! $this->current_table ) { |
| 355 | return; |
| 356 | } |
| 357 | |
| 358 | if ( $this->current_insert_index === 0 ) { |
| 359 | $this->output( "INSERT INTO `{$this->current_table}` {$field_names} VALUES" ); |
| 360 | } else { |
| 361 | $this->output( ',' ); |
| 362 | } |
| 363 | |
| 364 | $this->output( $data, false ); |
| 365 | |
| 366 | ++$this->current_insert_index; |
| 367 | } |
| 368 | |
| 369 | /** |
| 370 | * End table inserts. Enable keys. |
| 371 | * |
| 372 | * @return void |
| 373 | */ |
| 374 | public function end_table_inserts() { |
| 375 | if ( ! $this->current_table ) { |
| 376 | return; |
| 377 | } |
| 378 | |
| 379 | if ( $this->current_insert_index > 0 ) { |
| 380 | $this->output( ';' ); |
| 381 | } |
| 382 | |
| 383 | $this->var( "ALTER TABLE `{$this->current_table}` ENABLE KEYS", 40000 ); |
| 384 | $this->output( 'UNLOCK TABLES;' ); |
| 385 | $this->nl(); |
| 386 | |
| 387 | $this->current_insert_index = 0; |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * Get the real index name, from the SQLite index name. |
| 392 | * |
| 393 | * @param string $index_name The index name. |
| 394 | * |
| 395 | * @return string |
| 396 | */ |
| 397 | public static function get_index_name( string $index_name ): string { |
| 398 | if ( strlen( $index_name ) < 4 ) { |
| 399 | return ''; |
| 400 | } |
| 401 | |
| 402 | $real_names = explode( '__', $index_name ); |
| 403 | |
| 404 | if ( count( $real_names ) === 2 ) { |
| 405 | return $real_names[1]; |
| 406 | } |
| 407 | |
| 408 | return ''; |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * Get a column definition for the CREATE statement. |
| 413 | * |
| 414 | * @param string $name The column name. |
| 415 | * @param array $column The column definition. |
| 416 | * |
| 417 | * @return string |
| 418 | */ |
| 419 | public function get_column( string $name, array $column ): string { |
| 420 | if ( $name === '' || ! array_key_exists( 'type', $column ) || ! array_key_exists( 'sqlite_type', $column ) ) { |
| 421 | return ''; |
| 422 | } |
| 423 | |
| 424 | $ret = "`{$name}` {$column['type']}"; |
| 425 | |
| 426 | if ( null !== $this->collation && $column['sqlite_type'] === 'text' && $column['type'] !== 'datetime' ) { |
| 427 | $ret .= ' COLLATE ' . $this->collation; |
| 428 | } |
| 429 | |
| 430 | if ( array_key_exists( 'not_null', $column ) && $column['not_null'] ) { |
| 431 | $ret .= ' NOT NULL'; |
| 432 | } |
| 433 | |
| 434 | $is_auto_increment = array_key_exists( 'auto_increment', $column ) && $column['auto_increment']; |
| 435 | |
| 436 | if ( $is_auto_increment ) { |
| 437 | $ret .= ' AUTO_INCREMENT'; |
| 438 | } |
| 439 | |
| 440 | if ( ! $is_auto_increment && array_key_exists( 'default', $column ) && $column['default'] !== null ) { |
| 441 | $default = $column['default']; |
| 442 | |
| 443 | if ( $column['sqlite_type'] === 'integer' ) { |
| 444 | // Force an integer. The default value is a string. |
| 445 | $default = (int) $default; |
| 446 | } |
| 447 | |
| 448 | $ret .= ' DEFAULT ' . $default; |
| 449 | } |
| 450 | |
| 451 | return $ret; |
| 452 | } |
| 453 | |
| 454 | /** |
| 455 | * Get the dump. |
| 456 | * |
| 457 | * @return string |
| 458 | */ |
| 459 | public function get_dump(): string { |
| 460 | if ( $this->output_mode === self::OUTPUT_TYPE_STRING ) { |
| 461 | return $this->output_handle; |
| 462 | } |
| 463 | |
| 464 | return ''; |
| 465 | } |
| 466 | |
| 467 | /** |
| 468 | * Get current table. |
| 469 | * |
| 470 | * @return string|null |
| 471 | */ |
| 472 | public function get_current_table(): ?string { |
| 473 | return $this->current_table; |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * Start a table. |
| 478 | * |
| 479 | * @param string $table_name The table name. |
| 480 | * @param bool $add_drop Whether to add a DROP TABLE statement. |
| 481 | * |
| 482 | * @return void |
| 483 | */ |
| 484 | private function start_table_creation( string $table_name, bool $add_drop = true ) { |
| 485 | $this->current_table = $table_name; |
| 486 | $this->header( "Table structure for table `{$table_name}`" ); |
| 487 | |
| 488 | if ( $add_drop ) { |
| 489 | $this->output( "DROP TABLE IF EXISTS `{$table_name}`;" ); |
| 490 | } |
| 491 | |
| 492 | $this->var_assignment( '@saved_cs_client', '@@character_set_client' ); |
| 493 | $this->var_assignment( 'character_set_client', 'utf8' ); |
| 494 | $this->output( "CREATE TABLE `{$table_name}` (" ); |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * End table creation. |
| 499 | * |
| 500 | * @param string $table_name The table name. |
| 501 | * @param int $auto_increment The auto increment value. |
| 502 | * |
| 503 | * @return void |
| 504 | */ |
| 505 | private function end_table_creation( string $table_name, int $auto_increment ) { |
| 506 | $end = ') ENGINE=InnoDB'; |
| 507 | |
| 508 | if ( $auto_increment ) { |
| 509 | $end .= ' AUTO_INCREMENT=' . ( $auto_increment + 1 ); |
| 510 | } |
| 511 | |
| 512 | $end .= ' CHARSET=' . $this->charset; |
| 513 | |
| 514 | if ( null !== $this->collation ) { |
| 515 | $end .= ' COLLATE=' . $this->collation; |
| 516 | } |
| 517 | |
| 518 | $this->output( $end . ';' ); |
| 519 | |
| 520 | $this->var_assignment( 'character_set_client', '@saved_cs_client' ); |
| 521 | $this->nl(); |
| 522 | |
| 523 | $this->start_table_inserts(); |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * Reset the generator. |
| 528 | */ |
| 529 | private function reset() { |
| 530 | if ( $this->output_mode === self::OUTPUT_TYPE_FILE && $this->output_handle ) { |
| 531 | // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fclose |
| 532 | fclose( $this->output_handle ); |
| 533 | } |
| 534 | |
| 535 | $this->charset = self::DEFAULT_CHARSET; |
| 536 | $this->collation = null; |
| 537 | $this->current_insert_index = 0; |
| 538 | $this->current_table = null; |
| 539 | $this->output_handle = ''; |
| 540 | $this->output_mode = self::OUTPUT_TYPE_STRING; |
| 541 | $this->started = false; |
| 542 | $this->transaction = true; |
| 543 | } |
| 544 | } |