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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | namespace Wikimedia\Rdbms\Platform; |
| 21 | |
| 22 | use InvalidArgumentException; |
| 23 | use Psr\Log\LoggerInterface; |
| 24 | use Psr\Log\NullLogger; |
| 25 | use RuntimeException; |
| 26 | use Throwable; |
| 27 | use Wikimedia\Assert\Assert; |
| 28 | use Wikimedia\Rdbms\Database\DbQuoter; |
| 29 | use Wikimedia\Rdbms\DatabaseDomain; |
| 30 | use Wikimedia\Rdbms\DBLanguageError; |
| 31 | use Wikimedia\Rdbms\IExpression; |
| 32 | use Wikimedia\Rdbms\LikeMatch; |
| 33 | use Wikimedia\Rdbms\LikeValue; |
| 34 | use Wikimedia\Rdbms\Query; |
| 35 | use Wikimedia\Rdbms\QueryBuilderFromRawSql; |
| 36 | use Wikimedia\Rdbms\Subquery; |
| 37 | use Wikimedia\Timestamp\ConvertibleTimestamp; |
| 38 | |
| 39 | /** |
| 40 | * Sql abstraction object. |
| 41 | * This class nor any of its subclasses shouldn't create a db connection. |
| 42 | * It also should not become stateful. The constructor should only rely on addQuotes() method in Database. |
| 43 | * Later that should be replaced with an implementation that doesn't use db connections. |
| 44 | * @since 1.39 |
| 45 | */ |
| 46 | class SQLPlatform implements ISQLPlatform { |
| 47 | /** @var array[] Current map of (table => (dbname, schema, prefix) map) */ |
| 48 | protected $tableAliases = []; |
| 49 | /** @var string[] Current map of (index alias => index) */ |
| 50 | protected $indexAliases = []; |
| 51 | /** @var DatabaseDomain|null */ |
| 52 | protected $currentDomain; |
| 53 | /** @var array|null Current variables use for schema element placeholders */ |
| 54 | protected $schemaVars; |
| 55 | /** @var DbQuoter */ |
| 56 | protected $quoter; |
| 57 | /** @var LoggerInterface */ |
| 58 | protected $logger; |
| 59 | /** @var callable Error logging callback */ |
| 60 | protected $errorLogger; |
| 61 | |
| 62 | public function __construct( |
| 63 | DbQuoter $quoter, |
| 64 | LoggerInterface $logger = null, |
| 65 | DatabaseDomain $currentDomain = null, |
| 66 | $errorLogger = null |
| 67 | |
| 68 | ) { |
| 69 | $this->quoter = $quoter; |
| 70 | $this->logger = $logger ?? new NullLogger(); |
| 71 | $this->currentDomain = $currentDomain ?: DatabaseDomain::newUnspecified(); |
| 72 | $this->errorLogger = $errorLogger ?? static function ( Throwable $e ) { |
| 73 | trigger_error( get_class( $e ) . ': ' . $e->getMessage(), E_USER_WARNING ); |
| 74 | }; |
| 75 | } |
| 76 | |
| 77 | public function bitNot( $field ) { |
| 78 | return "(~$field)"; |
| 79 | } |
| 80 | |
| 81 | public function bitAnd( $fieldLeft, $fieldRight ) { |
| 82 | return "($fieldLeft & $fieldRight)"; |
| 83 | } |
| 84 | |
| 85 | public function bitOr( $fieldLeft, $fieldRight ) { |
| 86 | return "($fieldLeft | $fieldRight)"; |
| 87 | } |
| 88 | |
| 89 | public function addIdentifierQuotes( $s ) { |
| 90 | if ( strcspn( $s, "\0\"`'." ) !== strlen( $s ) ) { |
| 91 | throw new DBLanguageError( |
| 92 | "Identifier must not contain quote, dot or null characters" |
| 93 | ); |
| 94 | } |
| 95 | $quoteChar = $this->getIdentifierQuoteChar(); |
| 96 | return $quoteChar . $s . $quoteChar; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Get the character used for identifier quoting |
| 101 | * @return string |
| 102 | */ |
| 103 | protected function getIdentifierQuoteChar() { |
| 104 | return '"'; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * @inheritDoc |
| 109 | */ |
| 110 | public function buildGreatest( $fields, $values ) { |
| 111 | return $this->buildSuperlative( 'GREATEST', $fields, $values ); |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * @inheritDoc |
| 116 | */ |
| 117 | public function buildLeast( $fields, $values ) { |
| 118 | return $this->buildSuperlative( 'LEAST', $fields, $values ); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Build a superlative function statement comparing columns/values |
| 123 | * |
| 124 | * Integer and float values in $values will not be quoted |
| 125 | * |
| 126 | * If $fields is an array, then each value with a string key is treated as an expression |
| 127 | * (which must be manually quoted); such string keys do not appear in the SQL and are only |
| 128 | * descriptive aliases. |
| 129 | * |
| 130 | * @param string $sqlfunc Name of a SQL function |
| 131 | * @param string|string[] $fields Name(s) of column(s) with values to compare |
| 132 | * @param string|int|float|string[]|int[]|float[] $values Values to compare |
| 133 | * @return string |
| 134 | */ |
| 135 | protected function buildSuperlative( $sqlfunc, $fields, $values ) { |
| 136 | $fields = is_array( $fields ) ? $fields : [ $fields ]; |
| 137 | $values = is_array( $values ) ? $values : [ $values ]; |
| 138 | |
| 139 | $encValues = []; |
| 140 | foreach ( $fields as $alias => $field ) { |
| 141 | if ( is_int( $alias ) ) { |
| 142 | $encValues[] = $this->addIdentifierQuotes( $field ); |
| 143 | } else { |
| 144 | $encValues[] = $field; // expression |
| 145 | } |
| 146 | } |
| 147 | foreach ( $values as $value ) { |
| 148 | if ( is_int( $value ) || is_float( $value ) ) { |
| 149 | $encValues[] = $value; |
| 150 | } elseif ( is_string( $value ) ) { |
| 151 | $encValues[] = $this->quoter->addQuotes( $value ); |
| 152 | } elseif ( $value === null ) { |
| 153 | throw new DBLanguageError( 'Null value in superlative' ); |
| 154 | } else { |
| 155 | throw new DBLanguageError( 'Unexpected value type in superlative' ); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | return $sqlfunc . '(' . implode( ',', $encValues ) . ')'; |
| 160 | } |
| 161 | |
| 162 | public function buildComparison( string $op, array $conds ): string { |
| 163 | if ( !in_array( $op, [ '>', '>=', '<', '<=' ] ) ) { |
| 164 | throw new InvalidArgumentException( "Comparison operator must be one of '>', '>=', '<', '<='" ); |
| 165 | } |
| 166 | if ( count( $conds ) === 0 ) { |
| 167 | throw new InvalidArgumentException( "Empty input" ); |
| 168 | } |
| 169 | |
| 170 | // Construct a condition string by starting with the least significant part of the index, and |
| 171 | // adding more significant parts progressively to the left of the string. |
| 172 | // |
| 173 | // For example, given $conds = [ 'a' => 4, 'b' => 7, 'c' => 1 ], this will generate a condition |
| 174 | // like this: |
| 175 | // |
| 176 | // WHERE a > 4 |
| 177 | // OR (a = 4 AND (b > 7 |
| 178 | // OR (b = 7 AND (c > 1)))) |
| 179 | // |
| 180 | // …which is equivalent to the following, which might be easier to understand: |
| 181 | // |
| 182 | // WHERE a > 4 |
| 183 | // OR a = 4 AND b > 7 |
| 184 | // OR a = 4 AND b = 7 AND c > 1 |
| 185 | // |
| 186 | // …and also equivalent to the following, using tuple comparison syntax, which is most intuitive |
| 187 | // but apparently performs worse: |
| 188 | // |
| 189 | // WHERE (a, b, c) > (4, 7, 1) |
| 190 | |
| 191 | $sql = ''; |
| 192 | foreach ( array_reverse( $conds ) as $field => $value ) { |
| 193 | if ( is_int( $field ) ) { |
| 194 | throw new InvalidArgumentException( |
| 195 | 'Non-associative array passed to buildComparison() (typo?)' |
| 196 | ); |
| 197 | } |
| 198 | $encValue = $this->quoter->addQuotes( $value ); |
| 199 | if ( $sql === '' ) { |
| 200 | $sql = "$field $op $encValue"; |
| 201 | // Change '>=' to '>' etc. for remaining fields, as the equality is handled separately |
| 202 | $op = rtrim( $op, '=' ); |
| 203 | } else { |
| 204 | $sql = "$field $op $encValue OR ($field = $encValue AND ($sql))"; |
| 205 | } |
| 206 | } |
| 207 | return $sql; |
| 208 | } |
| 209 | |
| 210 | public function makeList( array $a, $mode = self::LIST_COMMA ) { |
| 211 | $first = true; |
| 212 | $list = ''; |
| 213 | |
| 214 | foreach ( $a as $field => $value ) { |
| 215 | if ( $first ) { |
| 216 | $first = false; |
| 217 | } else { |
| 218 | if ( $mode == self::LIST_AND ) { |
| 219 | $list .= ' AND '; |
| 220 | } elseif ( $mode == self::LIST_OR ) { |
| 221 | $list .= ' OR '; |
| 222 | } else { |
| 223 | $list .= ','; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | if ( ( $mode == self::LIST_AND || $mode == self::LIST_OR ) && is_numeric( $field ) ) { |
| 228 | if ( $value instanceof IExpression ) { |
| 229 | $list .= "(" . $value->toSql( $this->quoter ) . ")"; |
| 230 | } else { |
| 231 | $list .= "($value)"; |
| 232 | } |
| 233 | } elseif ( $mode == self::LIST_SET && is_numeric( $field ) ) { |
| 234 | $list .= "$value"; |
| 235 | } elseif ( |
| 236 | ( $mode == self::LIST_AND || $mode == self::LIST_OR ) && is_array( $value ) |
| 237 | ) { |
| 238 | // Remove null from array to be handled separately if found |
| 239 | $includeNull = false; |
| 240 | foreach ( array_keys( $value, null, true ) as $nullKey ) { |
| 241 | $includeNull = true; |
| 242 | unset( $value[$nullKey] ); |
| 243 | } |
| 244 | if ( count( $value ) == 0 && !$includeNull ) { |
| 245 | throw new InvalidArgumentException( |
| 246 | __METHOD__ . ": empty input for field $field" ); |
| 247 | } elseif ( count( $value ) == 0 ) { |
| 248 | // only check if $field is null |
| 249 | $list .= "$field IS NULL"; |
| 250 | } else { |
| 251 | // IN clause contains at least one valid element |
| 252 | if ( $includeNull ) { |
| 253 | // Group subconditions to ensure correct precedence |
| 254 | $list .= '('; |
| 255 | } |
| 256 | if ( count( $value ) == 1 ) { |
| 257 | // Special-case single values, as IN isn't terribly efficient |
| 258 | // Don't necessarily assume the single key is 0; we don't |
| 259 | // enforce linear numeric ordering on other arrays here. |
| 260 | $value = array_values( $value )[0]; |
| 261 | $list .= $field . " = " . $this->quoter->addQuotes( $value ); |
| 262 | } else { |
| 263 | $list .= $field . " IN (" . $this->makeList( $value ) . ") "; |
| 264 | } |
| 265 | // if null present in array, append IS NULL |
| 266 | if ( $includeNull ) { |
| 267 | $list .= " OR $field IS NULL)"; |
| 268 | } |
| 269 | } |
| 270 | } elseif ( $value === null ) { |
| 271 | if ( $mode == self::LIST_AND || $mode == self::LIST_OR ) { |
| 272 | $list .= "$field IS "; |
| 273 | } elseif ( $mode == self::LIST_SET ) { |
| 274 | $list .= "$field = "; |
| 275 | } |
| 276 | $list .= 'NULL'; |
| 277 | } else { |
| 278 | if ( |
| 279 | $mode == self::LIST_AND || $mode == self::LIST_OR || $mode == self::LIST_SET |
| 280 | ) { |
| 281 | $list .= "$field = "; |
| 282 | } |
| 283 | $list .= $mode == self::LIST_NAMES ? $value : $this->quoter->addQuotes( $value ); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | return $list; |
| 288 | } |
| 289 | |
| 290 | public function makeWhereFrom2d( $data, $baseKey, $subKey ) { |
| 291 | $conds = []; |
| 292 | foreach ( $data as $base => $sub ) { |
| 293 | if ( count( $sub ) ) { |
| 294 | $conds[] = $this->makeList( |
| 295 | [ $baseKey => $base, $subKey => array_map( 'strval', array_keys( $sub ) ) ], |
| 296 | self::LIST_AND |
| 297 | ); |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | if ( !$conds ) { |
| 302 | throw new InvalidArgumentException( "Data for $baseKey and $subKey must be non-empty" ); |
| 303 | } |
| 304 | |
| 305 | return $this->makeList( $conds, self::LIST_OR ); |
| 306 | } |
| 307 | |
| 308 | public function factorConds( $condsArray ) { |
| 309 | if ( count( $condsArray ) === 0 ) { |
| 310 | throw new InvalidArgumentException( |
| 311 | __METHOD__ . ": empty condition array" ); |
| 312 | } |
| 313 | $condsByFieldSet = []; |
| 314 | foreach ( $condsArray as $conds ) { |
| 315 | if ( !count( $conds ) ) { |
| 316 | throw new InvalidArgumentException( |
| 317 | __METHOD__ . ": empty condition subarray" ); |
| 318 | } |
| 319 | $fieldKey = implode( ',', array_keys( $conds ) ); |
| 320 | $condsByFieldSet[$fieldKey][] = $conds; |
| 321 | } |
| 322 | $result = ''; |
| 323 | foreach ( $condsByFieldSet as $conds ) { |
| 324 | if ( $result !== '' ) { |
| 325 | $result .= ' OR '; |
| 326 | } |
| 327 | $result .= $this->factorCondsWithCommonFields( $conds ); |
| 328 | } |
| 329 | return $result; |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * Same as factorConds() but with each element in the array having the same |
| 334 | * set of array keys. Validation is done by the caller. |
| 335 | * |
| 336 | * @param array $condsArray |
| 337 | * @return string |
| 338 | */ |
| 339 | private function factorCondsWithCommonFields( $condsArray ) { |
| 340 | $first = $condsArray[array_key_first( $condsArray )]; |
| 341 | if ( count( $first ) === 1 ) { |
| 342 | // IN clause |
| 343 | $field = array_key_first( $first ); |
| 344 | $values = []; |
| 345 | foreach ( $condsArray as $conds ) { |
| 346 | $values[] = $conds[$field]; |
| 347 | } |
| 348 | return $this->makeList( [ $field => $values ], self::LIST_AND ); |
| 349 | } |
| 350 | |
| 351 | $field1 = array_key_first( $first ); |
| 352 | $nullExpressions = []; |
| 353 | $expressionsByField1 = []; |
| 354 | foreach ( $condsArray as $conds ) { |
| 355 | $value1 = $conds[$field1]; |
| 356 | unset( $conds[$field1] ); |
| 357 | if ( $value1 === null ) { |
| 358 | $nullExpressions[] = $conds; |
| 359 | } else { |
| 360 | $expressionsByField1[$value1][] = $conds; |
| 361 | } |
| 362 | |
| 363 | } |
| 364 | $wrap = false; |
| 365 | $result = ''; |
| 366 | foreach ( $expressionsByField1 as $value1 => $expressions ) { |
| 367 | if ( $result !== '' ) { |
| 368 | $result .= ' OR '; |
| 369 | $wrap = true; |
| 370 | } |
| 371 | $factored = $this->factorCondsWithCommonFields( $expressions ); |
| 372 | $result .= "($field1 = " . $this->quoter->addQuotes( $value1 ) . |
| 373 | " AND $factored)"; |
| 374 | } |
| 375 | if ( count( $nullExpressions ) ) { |
| 376 | $factored = $this->factorCondsWithCommonFields( $nullExpressions ); |
| 377 | if ( $result !== '' ) { |
| 378 | $result .= ' OR '; |
| 379 | $wrap = true; |
| 380 | } |
| 381 | $result .= "($field1 IS NULL AND $factored)"; |
| 382 | } |
| 383 | if ( $wrap ) { |
| 384 | return "($result)"; |
| 385 | } else { |
| 386 | return $result; |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * @inheritDoc |
| 392 | * @stable to override |
| 393 | */ |
| 394 | public function buildConcat( $stringList ) { |
| 395 | return 'CONCAT(' . implode( ',', $stringList ) . ')'; |
| 396 | } |
| 397 | |
| 398 | public function limitResult( $sql, $limit, $offset = false ) { |
| 399 | if ( !is_numeric( $limit ) ) { |
| 400 | throw new DBLanguageError( |
| 401 | "Invalid non-numeric limit passed to " . __METHOD__ |
| 402 | ); |
| 403 | } |
| 404 | // This version works in MySQL and SQLite. It will very likely need to be |
| 405 | // overridden for most other RDBMS subclasses. |
| 406 | return "$sql LIMIT " |
| 407 | . ( ( is_numeric( $offset ) && $offset != 0 ) ? "{$offset}," : "" ) |
| 408 | . "{$limit} "; |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * @stable to override |
| 413 | * @param string $s |
| 414 | * @param string $escapeChar |
| 415 | * @return string |
| 416 | */ |
| 417 | public function escapeLikeInternal( $s, $escapeChar = '`' ) { |
| 418 | return str_replace( |
| 419 | [ $escapeChar, '%', '_' ], |
| 420 | [ "{$escapeChar}{$escapeChar}", "{$escapeChar}%", "{$escapeChar}_" ], |
| 421 | $s |
| 422 | ); |
| 423 | } |
| 424 | |
| 425 | public function buildLike( $param, ...$params ) { |
| 426 | if ( is_array( $param ) ) { |
| 427 | $params = $param; |
| 428 | } else { |
| 429 | $params = func_get_args(); |
| 430 | } |
| 431 | // @phan-suppress-next-line PhanParamTooFewUnpack |
| 432 | $likeValue = new LikeValue( ...$params ); |
| 433 | |
| 434 | return ' LIKE ' . $likeValue->toSql( $this->quoter ); |
| 435 | } |
| 436 | |
| 437 | public function anyChar() { |
| 438 | return new LikeMatch( '_' ); |
| 439 | } |
| 440 | |
| 441 | public function anyString() { |
| 442 | return new LikeMatch( '%' ); |
| 443 | } |
| 444 | |
| 445 | /** |
| 446 | * @inheritDoc |
| 447 | * @stable to override |
| 448 | */ |
| 449 | public function unionSupportsOrderAndLimit() { |
| 450 | return true; // True for almost every DB supported |
| 451 | } |
| 452 | |
| 453 | public function unionQueries( $sqls, $all, $options = [] ) { |
| 454 | $glue = $all ? ') UNION ALL (' : ') UNION ('; |
| 455 | |
| 456 | $sql = '(' . implode( $glue, $sqls ) . ')'; |
| 457 | if ( !$this->unionSupportsOrderAndLimit() ) { |
| 458 | return $sql; |
| 459 | } |
| 460 | $sql .= $this->makeOrderBy( $options ); |
| 461 | $limit = $options['LIMIT'] ?? null; |
| 462 | $offset = $options['OFFSET'] ?? false; |
| 463 | if ( $limit !== null ) { |
| 464 | $sql = $this->limitResult( $sql, $limit, $offset ); |
| 465 | } |
| 466 | |
| 467 | return $sql; |
| 468 | } |
| 469 | |
| 470 | public function conditional( $cond, $caseTrueExpression, $caseFalseExpression ) { |
| 471 | if ( is_array( $cond ) ) { |
| 472 | $cond = $this->makeList( $cond, self::LIST_AND ); |
| 473 | } |
| 474 | if ( $cond instanceof IExpression ) { |
| 475 | $cond = $cond->toSql( $this->quoter ); |
| 476 | } |
| 477 | |
| 478 | return "(CASE WHEN $cond THEN $caseTrueExpression ELSE $caseFalseExpression END)"; |
| 479 | } |
| 480 | |
| 481 | public function strreplace( $orig, $old, $new ) { |
| 482 | return "REPLACE({$orig}, {$old}, {$new})"; |
| 483 | } |
| 484 | |
| 485 | public function timestamp( $ts = 0 ) { |
| 486 | $t = new ConvertibleTimestamp( $ts ); |
| 487 | // Let errors bubble up to avoid putting garbage in the DB |
| 488 | return $t->getTimestamp( TS_MW ); |
| 489 | } |
| 490 | |
| 491 | public function timestampOrNull( $ts = null ) { |
| 492 | if ( $ts === null ) { |
| 493 | return null; |
| 494 | } else { |
| 495 | return $this->timestamp( $ts ); |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | public function getInfinity() { |
| 500 | return 'infinity'; |
| 501 | } |
| 502 | |
| 503 | public function encodeExpiry( $expiry ) { |
| 504 | return ( $expiry == '' || $expiry == 'infinity' || $expiry == $this->getInfinity() ) |
| 505 | ? $this->getInfinity() |
| 506 | : $this->timestamp( $expiry ); |
| 507 | } |
| 508 | |
| 509 | public function decodeExpiry( $expiry, $format = TS_MW ) { |
| 510 | if ( $expiry == '' || $expiry == 'infinity' || $expiry == $this->getInfinity() ) { |
| 511 | return 'infinity'; |
| 512 | } |
| 513 | |
| 514 | return ConvertibleTimestamp::convert( $format, $expiry ); |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * @inheritDoc |
| 519 | * @stable to override |
| 520 | */ |
| 521 | public function buildSubstring( $input, $startPosition, $length = null ) { |
| 522 | $this->assertBuildSubstringParams( $startPosition, $length ); |
| 523 | $functionBody = "$input FROM $startPosition"; |
| 524 | if ( $length !== null ) { |
| 525 | $functionBody .= " FOR $length"; |
| 526 | } |
| 527 | return 'SUBSTRING(' . $functionBody . ')'; |
| 528 | } |
| 529 | |
| 530 | /** |
| 531 | * Check type and bounds for parameters to self::buildSubstring() |
| 532 | * |
| 533 | * All supported databases have substring functions that behave the same for |
| 534 | * positive $startPosition and non-negative $length, but behaviors differ when |
| 535 | * given negative $startPosition or negative $length. The simplest |
| 536 | * solution to that is to just forbid those values. |
| 537 | * |
| 538 | * @param int $startPosition |
| 539 | * @param int|null $length |
| 540 | * @since 1.31 in Database, moved to SQLPlatform in 1.39 |
| 541 | */ |
| 542 | protected function assertBuildSubstringParams( $startPosition, $length ) { |
| 543 | if ( $startPosition === 0 ) { |
| 544 | // The DBMSs we support use 1-based indexing here. |
| 545 | throw new InvalidArgumentException( 'Use 1 as $startPosition for the beginning of the string' ); |
| 546 | } |
| 547 | if ( !is_int( $startPosition ) || $startPosition < 0 ) { |
| 548 | throw new InvalidArgumentException( |
| 549 | '$startPosition must be a positive integer' |
| 550 | ); |
| 551 | } |
| 552 | if ( !( ( is_int( $length ) && $length >= 0 ) || $length === null ) ) { |
| 553 | throw new InvalidArgumentException( |
| 554 | '$length must be null or an integer greater than or equal to 0' |
| 555 | ); |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | public function buildStringCast( $field ) { |
| 560 | // In theory this should work for any standards-compliant |
| 561 | // SQL implementation, although it may not be the best way to do it. |
| 562 | return "CAST( $field AS CHARACTER )"; |
| 563 | } |
| 564 | |
| 565 | public function buildIntegerCast( $field ) { |
| 566 | return 'CAST( ' . $field . ' AS INTEGER )'; |
| 567 | } |
| 568 | |
| 569 | public function implicitOrderby() { |
| 570 | return true; |
| 571 | } |
| 572 | |
| 573 | /** |
| 574 | * Allows for index remapping in queries where this is not consistent across DBMS |
| 575 | * |
| 576 | * TODO: Make it protected once all the code is moved over. |
| 577 | * |
| 578 | * @param string $index |
| 579 | * @return string |
| 580 | */ |
| 581 | public function indexName( $index ) { |
| 582 | return $this->indexAliases[$index] ?? $index; |
| 583 | } |
| 584 | |
| 585 | public function setTableAliases( array $aliases ) { |
| 586 | $this->tableAliases = $aliases; |
| 587 | } |
| 588 | |
| 589 | public function setIndexAliases( array $aliases ) { |
| 590 | $this->indexAliases = $aliases; |
| 591 | } |
| 592 | |
| 593 | /** |
| 594 | * @return array[] |
| 595 | */ |
| 596 | public function getTableAliases() { |
| 597 | return $this->tableAliases; |
| 598 | } |
| 599 | |
| 600 | public function setPrefix( $prefix ) { |
| 601 | $this->currentDomain = new DatabaseDomain( |
| 602 | $this->currentDomain->getDatabase(), |
| 603 | $this->currentDomain->getSchema(), |
| 604 | $prefix |
| 605 | ); |
| 606 | } |
| 607 | |
| 608 | public function setCurrentDomain( DatabaseDomain $currentDomain ) { |
| 609 | $this->currentDomain = $currentDomain; |
| 610 | } |
| 611 | |
| 612 | public function selectSQLText( |
| 613 | $table, $vars, $conds = '', $fname = __METHOD__, $options = [], $join_conds = [] |
| 614 | ) { |
| 615 | if ( is_array( $table ) ) { |
| 616 | $tables = $table; |
| 617 | } elseif ( $table === '' || $table === null || $table === false ) { |
| 618 | $tables = []; |
| 619 | } elseif ( is_string( $table ) ) { |
| 620 | $tables = [ $table ]; |
| 621 | } else { |
| 622 | throw new DBLanguageError( __METHOD__ . ' called with incorrect table parameter' ); |
| 623 | } |
| 624 | |
| 625 | if ( is_array( $vars ) ) { |
| 626 | $fields = implode( ',', $this->fieldNamesWithAlias( $vars ) ); |
| 627 | } else { |
| 628 | $fields = $vars; |
| 629 | } |
| 630 | |
| 631 | $options = (array)$options; |
| 632 | |
| 633 | $useIndexByTable = $options['USE INDEX'] ?? []; |
| 634 | if ( !is_array( $useIndexByTable ) ) { |
| 635 | if ( count( $tables ) <= 1 ) { |
| 636 | $useIndexByTable = [ reset( $tables ) => $useIndexByTable ]; |
| 637 | } else { |
| 638 | $e = new DBLanguageError( __METHOD__ . " got ambiguous USE INDEX ($fname)" ); |
| 639 | ( $this->errorLogger )( $e ); |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | $ignoreIndexByTable = $options['IGNORE INDEX'] ?? []; |
| 644 | if ( !is_array( $ignoreIndexByTable ) ) { |
| 645 | if ( count( $tables ) <= 1 ) { |
| 646 | $ignoreIndexByTable = [ reset( $tables ) => $ignoreIndexByTable ]; |
| 647 | } else { |
| 648 | $e = new DBLanguageError( __METHOD__ . " got ambiguous IGNORE INDEX ($fname)" ); |
| 649 | ( $this->errorLogger )( $e ); |
| 650 | } |
| 651 | } |
| 652 | |
| 653 | if ( |
| 654 | $this->selectOptionsIncludeLocking( $options ) && |
| 655 | $this->selectFieldsOrOptionsAggregate( $vars, $options ) |
| 656 | ) { |
| 657 | // Some DB types (e.g. postgres) disallow FOR UPDATE with aggregate |
| 658 | // functions. Discourage use of such queries to encourage compatibility. |
| 659 | $this->logger->warning( |
| 660 | __METHOD__ . ": aggregation used with a locking SELECT ($fname)" |
| 661 | ); |
| 662 | } |
| 663 | |
| 664 | if ( count( $tables ) ) { |
| 665 | $from = ' FROM ' . $this->tableNamesWithIndexClauseOrJOIN( |
| 666 | $tables, |
| 667 | $useIndexByTable, |
| 668 | $ignoreIndexByTable, |
| 669 | $join_conds |
| 670 | ); |
| 671 | } else { |
| 672 | $from = ''; |
| 673 | } |
| 674 | |
| 675 | [ $startOpts, $preLimitTail, $postLimitTail ] = $this->makeSelectOptions( $options ); |
| 676 | |
| 677 | if ( is_array( $conds ) ) { |
| 678 | $where = $this->makeList( $conds, self::LIST_AND ); |
| 679 | } elseif ( $conds instanceof IExpression ) { |
| 680 | $where = $conds->toSql( $this->quoter ); |
| 681 | } elseif ( $conds === null || $conds === false ) { |
| 682 | $where = ''; |
| 683 | $this->logger->warning( |
| 684 | __METHOD__ |
| 685 | . ' called from ' |
| 686 | . $fname |
| 687 | . ' with incorrect parameters: $conds must be a string or an array', |
| 688 | [ 'db_log_category' => 'sql' ] |
| 689 | ); |
| 690 | } elseif ( is_string( $conds ) ) { |
| 691 | $where = $conds; |
| 692 | } else { |
| 693 | throw new DBLanguageError( __METHOD__ . ' called with incorrect parameters' ); |
| 694 | } |
| 695 | |
| 696 | // Keep historical extra spaces after FROM to avoid testing failures |
| 697 | if ( $where === '' || $where === '*' ) { |
| 698 | $sql = "SELECT $startOpts $fields $from $preLimitTail"; |
| 699 | } else { |
| 700 | $sql = "SELECT $startOpts $fields $from WHERE $where $preLimitTail"; |
| 701 | } |
| 702 | |
| 703 | if ( isset( $options['LIMIT'] ) ) { |
| 704 | $sql = $this->limitResult( $sql, $options['LIMIT'], $options['OFFSET'] ?? false ); |
| 705 | } |
| 706 | $sql = "$sql $postLimitTail"; |
| 707 | |
| 708 | if ( isset( $options['EXPLAIN'] ) ) { |
| 709 | $sql = 'EXPLAIN ' . $sql; |
| 710 | } |
| 711 | |
| 712 | return $sql; |
| 713 | } |
| 714 | |
| 715 | /** |
| 716 | * @param string|array $options |
| 717 | * @return bool |
| 718 | */ |
| 719 | private function selectOptionsIncludeLocking( $options ) { |
| 720 | $options = (array)$options; |
| 721 | foreach ( [ 'FOR UPDATE', 'LOCK IN SHARE MODE' ] as $lock ) { |
| 722 | if ( in_array( $lock, $options, true ) ) { |
| 723 | return true; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | return false; |
| 728 | } |
| 729 | |
| 730 | /** |
| 731 | * @param array|string $fields |
| 732 | * @param array|string $options |
| 733 | * @return bool |
| 734 | */ |
| 735 | private function selectFieldsOrOptionsAggregate( $fields, $options ) { |
| 736 | foreach ( (array)$options as $key => $value ) { |
| 737 | if ( is_string( $key ) ) { |
| 738 | if ( preg_match( '/^(?:GROUP BY|HAVING)$/i', $key ) ) { |
| 739 | return true; |
| 740 | } |
| 741 | } elseif ( is_string( $value ) ) { |
| 742 | if ( preg_match( '/^(?:DISTINCT|DISTINCTROW)$/i', $value ) ) { |
| 743 | return true; |
| 744 | } |
| 745 | } |
| 746 | } |
| 747 | |
| 748 | $regex = '/^(?:COUNT|MIN|MAX|SUM|GROUP_CONCAT|LISTAGG|ARRAY_AGG)\s*\\(/i'; |
| 749 | foreach ( (array)$fields as $field ) { |
| 750 | if ( is_string( $field ) && preg_match( $regex, $field ) ) { |
| 751 | return true; |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | return false; |
| 756 | } |
| 757 | |
| 758 | /** |
| 759 | * Gets an array of aliased field names |
| 760 | * |
| 761 | * @param array $fields [ [alias] => field ] |
| 762 | * @return string[] See fieldNameWithAlias() |
| 763 | */ |
| 764 | protected function fieldNamesWithAlias( $fields ) { |
| 765 | $retval = []; |
| 766 | foreach ( $fields as $alias => $field ) { |
| 767 | if ( is_numeric( $alias ) ) { |
| 768 | $alias = $field; |
| 769 | } |
| 770 | $retval[] = $this->fieldNameWithAlias( $field, $alias ); |
| 771 | } |
| 772 | |
| 773 | return $retval; |
| 774 | } |
| 775 | |
| 776 | /** |
| 777 | * Get an aliased field name |
| 778 | * e.g. fieldName AS newFieldName |
| 779 | * |
| 780 | * @stable to override |
| 781 | * @param string $name Field name |
| 782 | * @param string|false $alias Alias (optional) |
| 783 | * @return string SQL name for aliased field. Will not alias a field to its own name |
| 784 | */ |
| 785 | public function fieldNameWithAlias( $name, $alias = false ) { |
| 786 | if ( !$alias || (string)$alias === (string)$name ) { |
| 787 | return $name; |
| 788 | } else { |
| 789 | return $name . ' AS ' . $this->addIdentifierQuotes( $alias ); // PostgreSQL needs AS |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | /** |
| 794 | * Get the aliased table name clause for a FROM clause |
| 795 | * which might have a JOIN and/or USE INDEX or IGNORE INDEX clause |
| 796 | * |
| 797 | * @param array $tables ( [alias] => table ) |
| 798 | * @param array $use_index Same as for select() |
| 799 | * @param array $ignore_index Same as for select() |
| 800 | * @param array $join_conds Same as for select() |
| 801 | * @return string |
| 802 | */ |
| 803 | protected function tableNamesWithIndexClauseOrJOIN( |
| 804 | $tables, |
| 805 | $use_index = [], |
| 806 | $ignore_index = [], |
| 807 | $join_conds = [] |
| 808 | ) { |
| 809 | $ret = []; |
| 810 | $retJOIN = []; |
| 811 | $use_index = (array)$use_index; |
| 812 | $ignore_index = (array)$ignore_index; |
| 813 | $join_conds = (array)$join_conds; |
| 814 | |
| 815 | foreach ( $tables as $alias => $table ) { |
| 816 | if ( !is_string( $alias ) ) { |
| 817 | // No alias? Set it equal to the table name |
| 818 | $alias = $table; |
| 819 | } |
| 820 | |
| 821 | if ( is_array( $table ) ) { |
| 822 | // A parenthesized group |
| 823 | if ( count( $table ) > 1 ) { |
| 824 | $joinedTable = '(' . |
| 825 | $this->tableNamesWithIndexClauseOrJOIN( |
| 826 | $table, $use_index, $ignore_index, $join_conds ) . ')'; |
| 827 | } else { |
| 828 | // Degenerate case |
| 829 | $innerTable = reset( $table ); |
| 830 | $innerAlias = key( $table ); |
| 831 | $joinedTable = $this->tableNameWithAlias( |
| 832 | $innerTable, |
| 833 | is_string( $innerAlias ) ? $innerAlias : $innerTable |
| 834 | ); |
| 835 | } |
| 836 | } else { |
| 837 | $joinedTable = $this->tableNameWithAlias( $table, $alias ); |
| 838 | } |
| 839 | |
| 840 | // Is there a JOIN clause for this table? |
| 841 | if ( isset( $join_conds[$alias] ) ) { |
| 842 | Assert::parameterType( 'array', $join_conds[$alias], "join_conds[$alias]" ); |
| 843 | [ $joinType, $conds ] = $join_conds[$alias]; |
| 844 | $tableClause = $this->normalizeJoinType( $joinType ); |
| 845 | $tableClause .= ' ' . $joinedTable; |
| 846 | if ( isset( $use_index[$alias] ) ) { // has USE INDEX? |
| 847 | $use = $this->useIndexClause( implode( ',', (array)$use_index[$alias] ) ); |
| 848 | if ( $use != '' ) { |
| 849 | $tableClause .= ' ' . $use; |
| 850 | } |
| 851 | } |
| 852 | if ( isset( $ignore_index[$alias] ) ) { // has IGNORE INDEX? |
| 853 | $ignore = $this->ignoreIndexClause( |
| 854 | implode( ',', (array)$ignore_index[$alias] ) ); |
| 855 | if ( $ignore != '' ) { |
| 856 | $tableClause .= ' ' . $ignore; |
| 857 | } |
| 858 | } |
| 859 | $on = $this->makeList( (array)$conds, self::LIST_AND ); |
| 860 | if ( $on != '' ) { |
| 861 | $tableClause .= ' ON (' . $on . ')'; |
| 862 | } |
| 863 | |
| 864 | $retJOIN[] = $tableClause; |
| 865 | } elseif ( isset( $use_index[$alias] ) ) { |
| 866 | // Is there an INDEX clause for this table? |
| 867 | $tableClause = $joinedTable; |
| 868 | $tableClause .= ' ' . $this->useIndexClause( |
| 869 | implode( ',', (array)$use_index[$alias] ) |
| 870 | ); |
| 871 | |
| 872 | $ret[] = $tableClause; |
| 873 | } elseif ( isset( $ignore_index[$alias] ) ) { |
| 874 | // Is there an INDEX clause for this table? |
| 875 | $tableClause = $joinedTable; |
| 876 | $tableClause .= ' ' . $this->ignoreIndexClause( |
| 877 | implode( ',', (array)$ignore_index[$alias] ) |
| 878 | ); |
| 879 | |
| 880 | $ret[] = $tableClause; |
| 881 | } else { |
| 882 | $tableClause = $joinedTable; |
| 883 | |
| 884 | $ret[] = $tableClause; |
| 885 | } |
| 886 | } |
| 887 | |
| 888 | // We can't separate explicit JOIN clauses with ',', use ' ' for those |
| 889 | $implicitJoins = implode( ',', $ret ); |
| 890 | $explicitJoins = implode( ' ', $retJOIN ); |
| 891 | |
| 892 | // Compile our final table clause |
| 893 | return implode( ' ', [ $implicitJoins, $explicitJoins ] ); |
| 894 | } |
| 895 | |
| 896 | /** |
| 897 | * Validate and normalize a join type |
| 898 | * |
| 899 | * Subclasses may override this to add supported join types. |
| 900 | * |
| 901 | * @param string $joinType |
| 902 | * @return string |
| 903 | */ |
| 904 | protected function normalizeJoinType( string $joinType ) { |
| 905 | switch ( strtoupper( $joinType ) ) { |
| 906 | case 'JOIN': |
| 907 | case 'INNER JOIN': |
| 908 | return 'JOIN'; |
| 909 | |
| 910 | case 'LEFT JOIN': |
| 911 | return 'LEFT JOIN'; |
| 912 | |
| 913 | case 'STRAIGHT_JOIN': |
| 914 | case 'STRAIGHT JOIN': |
| 915 | // MySQL only |
| 916 | return 'JOIN'; |
| 917 | |
| 918 | default: |
| 919 | return $joinType; |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | /** |
| 924 | * Get an aliased table name |
| 925 | * |
| 926 | * This returns strings like "tableName AS newTableName" for aliased tables |
| 927 | * and "(SELECT * from tableA) newTablename" for subqueries (e.g. derived tables) |
| 928 | * |
| 929 | * @see Database::tableName() |
| 930 | * @param string|Subquery $table Table name or object with a 'sql' field |
| 931 | * @param string|false $alias Table alias (optional) |
| 932 | * @return string SQL name for aliased table. Will not alias a table to its own name |
| 933 | */ |
| 934 | protected function tableNameWithAlias( $table, $alias = false ) { |
| 935 | if ( is_string( $table ) ) { |
| 936 | $quotedTable = $this->tableName( $table ); |
| 937 | } elseif ( $table instanceof Subquery ) { |
| 938 | $quotedTable = (string)$table; |
| 939 | } else { |
| 940 | throw new InvalidArgumentException( "Table must be a string or Subquery" ); |
| 941 | } |
| 942 | |
| 943 | if ( $alias === false || $alias === $table ) { |
| 944 | if ( $table instanceof Subquery ) { |
| 945 | throw new InvalidArgumentException( "Subquery table missing alias" ); |
| 946 | } |
| 947 | |
| 948 | return $quotedTable; |
| 949 | } else { |
| 950 | return $quotedTable . ' ' . $this->addIdentifierQuotes( $alias ); |
| 951 | } |
| 952 | } |
| 953 | |
| 954 | public function tableName( string $name, $format = 'quoted' ) { |
| 955 | // Extract necessary database, schema, table identifiers and quote them as needed |
| 956 | $formattedComponents = []; |
| 957 | foreach ( $this->qualifiedTableComponents( $name ) as $component ) { |
| 958 | if ( $format === 'quoted' ) { |
| 959 | $formattedComponents[] = $this->addIdentifierQuotes( $component ); |
| 960 | } else { |
| 961 | $formattedComponents[] = $component; |
| 962 | } |
| 963 | } |
| 964 | |
| 965 | return implode( '.', $formattedComponents ); |
| 966 | } |
| 967 | |
| 968 | /** |
| 969 | * Get the table components needed for a query given the currently selected database/schema |
| 970 | * |
| 971 | * The resulting array will take one of the follow forms: |
| 972 | * - <table identifier> |
| 973 | * - <database identifier>.<table identifier> (e.g. non-Postgres) |
| 974 | * - <schema identifier>.<table identifier> (e.g. Postgres-only) |
| 975 | * - <database identifier>.<schema identifier>.<table identifier> (e.g. Postgres-only) |
| 976 | * |
| 977 | * If the provided table name only consists of an unquoted table identifier that has an |
| 978 | * entry in ({@link getTableAliases()}), then, the resulting components will be determined |
| 979 | * from the alias configuration. If such alias configuration does not specify the table |
| 980 | * prefix, then the current DB domain prefix will be prepended to the table identifier. |
| 981 | * |
| 982 | * In all other cases where the provided table name only consists of an unquoted table |
| 983 | * identifier, the current DB domain prefix will be prepended to the table identifier. |
| 984 | * |
| 985 | * Empty database/schema identifiers are omitted from the resulting array. |
| 986 | * |
| 987 | * @param string $name Table name as database.schema.table, database.table, or table |
| 988 | * @return string[] Non-empty list of unquoted identifiers that form the qualified table name |
| 989 | */ |
| 990 | public function qualifiedTableComponents( $name ) { |
| 991 | $identifiers = $this->extractTableNameComponents( $name ); |
| 992 | if ( count( $identifiers ) > 3 ) { |
| 993 | throw new DBLanguageError( "Too many components in table name '$name'" ); |
| 994 | } |
| 995 | // Table alias config and prefixes only apply to unquoted single-identifier names |
| 996 | if ( count( $identifiers ) == 1 && !$this->isQuotedIdentifier( $identifiers[0] ) ) { |
| 997 | [ $table ] = $identifiers; |
| 998 | if ( isset( $this->tableAliases[$table] ) ) { |
| 999 | // This is an "alias" table that uses a different db/schema/prefix scheme |
| 1000 | $database = $this->tableAliases[$table]['dbname']; |
| 1001 | $schema = is_string( $this->tableAliases[$table]['schema'] ) |
| 1002 | ? $this->tableAliases[$table]['schema'] |
| 1003 | : $this->relationSchemaQualifier(); |
| 1004 | $prefix = is_string( $this->tableAliases[$table]['prefix'] ) |
| 1005 | ? $this->tableAliases[$table]['prefix'] |
| 1006 | : $this->currentDomain->getTablePrefix(); |
| 1007 | } else { |
| 1008 | // Use the current database domain to resolve the schema and prefix |
| 1009 | $database = ''; |
| 1010 | $schema = $this->relationSchemaQualifier(); |
| 1011 | $prefix = $this->currentDomain->getTablePrefix(); |
| 1012 | } |
| 1013 | $qualifierIdentifiers = [ $database, $schema ]; |
| 1014 | $tableIdentifier = $prefix . $table; |
| 1015 | } else { |
| 1016 | $qualifierIdentifiers = array_slice( $identifiers, 0, -1 ); |
| 1017 | $tableIdentifier = end( $identifiers ); |
| 1018 | } |
| 1019 | |
| 1020 | $components = []; |
| 1021 | foreach ( $qualifierIdentifiers as $identifier ) { |
| 1022 | if ( $identifier !== null && $identifier !== '' ) { |
| 1023 | $components[] = $this->isQuotedIdentifier( $identifier ) |
| 1024 | ? substr( $identifier, 1, -1 ) |
| 1025 | : $identifier; |
| 1026 | } |
| 1027 | } |
| 1028 | $components[] = $this->isQuotedIdentifier( $tableIdentifier ) |
| 1029 | ? substr( $tableIdentifier, 1, -1 ) |
| 1030 | : $tableIdentifier; |
| 1031 | |
| 1032 | return $components; |
| 1033 | } |
| 1034 | |
| 1035 | /** |
| 1036 | * Extract the dot-separated components of a table name, preserving identifier quotation |
| 1037 | * |
| 1038 | * @param string $name Table name, possible qualified with db or db+schema |
| 1039 | * @return string[] Non-empty list of the identifiers included in the provided table name |
| 1040 | */ |
| 1041 | public function extractTableNameComponents( string $name ) { |
| 1042 | $quoteChar = $this->getIdentifierQuoteChar(); |
| 1043 | $components = []; |
| 1044 | foreach ( explode( '.', $name ) as $component ) { |
| 1045 | if ( $this->isQuotedIdentifier( $component ) ) { |
| 1046 | $unquotedComponent = substr( $component, 1, -1 ); |
| 1047 | } else { |
| 1048 | $unquotedComponent = $component; |
| 1049 | } |
| 1050 | if ( str_contains( $unquotedComponent, $quoteChar ) ) { |
| 1051 | throw new DBLanguageError( |
| 1052 | 'Table name component contains unexpected quote or dot character' ); |
| 1053 | } |
| 1054 | $components[] = $component; |
| 1055 | } |
| 1056 | return $components; |
| 1057 | } |
| 1058 | |
| 1059 | /** |
| 1060 | * @stable to override |
| 1061 | * @return string|null Schema to use to qualify relations in queries |
| 1062 | */ |
| 1063 | protected function relationSchemaQualifier() { |
| 1064 | return $this->currentDomain->getSchema(); |
| 1065 | } |
| 1066 | |
| 1067 | public function tableNames( ...$tables ) { |
| 1068 | wfDeprecated( '1.39' ); |
| 1069 | |
| 1070 | $retVal = []; |
| 1071 | |
| 1072 | foreach ( $tables as $name ) { |
| 1073 | $retVal[$name] = $this->tableName( $name ); |
| 1074 | } |
| 1075 | |
| 1076 | return $retVal; |
| 1077 | } |
| 1078 | |
| 1079 | public function tableNamesN( ...$tables ) { |
| 1080 | $retVal = []; |
| 1081 | |
| 1082 | foreach ( $tables as $name ) { |
| 1083 | $retVal[] = $this->tableName( $name ); |
| 1084 | } |
| 1085 | |
| 1086 | return $retVal; |
| 1087 | } |
| 1088 | |
| 1089 | /** |
| 1090 | * Returns if the given identifier looks quoted or not according to |
| 1091 | * the database convention for quoting identifiers |
| 1092 | * |
| 1093 | * @note Do not use this to determine if untrusted input is safe. |
| 1094 | * A malicious user can trick this function. |
| 1095 | * @param string $name |
| 1096 | * @return bool |
| 1097 | */ |
| 1098 | public function isQuotedIdentifier( $name ) { |
| 1099 | $quoteChar = $this->getIdentifierQuoteChar(); |
| 1100 | return strlen( $name ) > 1 && $name[0] === $quoteChar && $name[-1] === $quoteChar; |
| 1101 | } |
| 1102 | |
| 1103 | /** |
| 1104 | * USE INDEX clause. |
| 1105 | * |
| 1106 | * This can be used as optimisation in queries that affect tables with multiple |
| 1107 | * indexes if the database does not pick the most optimal one by default. |
| 1108 | * The "right" index might vary between database backends and versions thereof, |
| 1109 | * as such in practice this is biased toward specifically improving performance |
| 1110 | * of large wiki farms that use MySQL or MariaDB (like Wikipedia). |
| 1111 | * |
| 1112 | * @stable to override |
| 1113 | * @param string $index |
| 1114 | * @return string |
| 1115 | */ |
| 1116 | public function useIndexClause( $index ) { |
| 1117 | return ''; |
| 1118 | } |
| 1119 | |
| 1120 | /** |
| 1121 | * IGNORE INDEX clause. |
| 1122 | * |
| 1123 | * The inverse of Database::useIndexClause. |
| 1124 | * |
| 1125 | * @param string $index |
| 1126 | * @return string |
| 1127 | */ |
| 1128 | public function ignoreIndexClause( $index ) { |
| 1129 | return ''; |
| 1130 | } |
| 1131 | |
| 1132 | /** |
| 1133 | * Returns an optional USE INDEX clause to go after the table, and a |
| 1134 | * string to go at the end of the query. |
| 1135 | * |
| 1136 | * @see Database::select() |
| 1137 | * |
| 1138 | * @stable to override |
| 1139 | * @param array $options Associative array of options to be turned into |
| 1140 | * an SQL query, valid keys are listed in the function. |
| 1141 | * @return string[] (START OPTIONS, PRE-LIMIT TAIL, POST-LIMIT TAIL) |
| 1142 | */ |
| 1143 | protected function makeSelectOptions( array $options ) { |
| 1144 | $preLimitTail = $postLimitTail = ''; |
| 1145 | $startOpts = ''; |
| 1146 | |
| 1147 | $noKeyOptions = []; |
| 1148 | |
| 1149 | foreach ( $options as $key => $option ) { |
| 1150 | if ( is_numeric( $key ) ) { |
| 1151 | $noKeyOptions[$option] = true; |
| 1152 | } |
| 1153 | } |
| 1154 | |
| 1155 | $preLimitTail .= $this->makeGroupByWithHaving( $options ); |
| 1156 | |
| 1157 | $preLimitTail .= $this->makeOrderBy( $options ); |
| 1158 | |
| 1159 | if ( isset( $noKeyOptions['FOR UPDATE'] ) ) { |
| 1160 | $postLimitTail .= ' FOR UPDATE'; |
| 1161 | } |
| 1162 | |
| 1163 | if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) { |
| 1164 | $postLimitTail .= ' LOCK IN SHARE MODE'; |
| 1165 | } |
| 1166 | |
| 1167 | if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) { |
| 1168 | $startOpts .= 'DISTINCT'; |
| 1169 | } |
| 1170 | |
| 1171 | # Various MySQL extensions |
| 1172 | if ( isset( $noKeyOptions['STRAIGHT_JOIN'] ) ) { |
| 1173 | $startOpts .= ' /*! STRAIGHT_JOIN */'; |
| 1174 | } |
| 1175 | |
| 1176 | if ( isset( $noKeyOptions['SQL_BIG_RESULT'] ) ) { |
| 1177 | $startOpts .= ' SQL_BIG_RESULT'; |
| 1178 | } |
| 1179 | |
| 1180 | if ( isset( $noKeyOptions['SQL_BUFFER_RESULT'] ) ) { |
| 1181 | $startOpts .= ' SQL_BUFFER_RESULT'; |
| 1182 | } |
| 1183 | |
| 1184 | if ( isset( $noKeyOptions['SQL_SMALL_RESULT'] ) ) { |
| 1185 | $startOpts .= ' SQL_SMALL_RESULT'; |
| 1186 | } |
| 1187 | |
| 1188 | if ( isset( $noKeyOptions['SQL_CALC_FOUND_ROWS'] ) ) { |
| 1189 | $startOpts .= ' SQL_CALC_FOUND_ROWS'; |
| 1190 | } |
| 1191 | |
| 1192 | return [ $startOpts, $preLimitTail, $postLimitTail ]; |
| 1193 | } |
| 1194 | |
| 1195 | /** |
| 1196 | * Returns an optional GROUP BY with an optional HAVING |
| 1197 | * |
| 1198 | * @param array $options Associative array of options |
| 1199 | * @return string |
| 1200 | * @see Database::select() |
| 1201 | * @since 1.21 |
| 1202 | */ |
| 1203 | protected function makeGroupByWithHaving( $options ) { |
| 1204 | $sql = ''; |
| 1205 | if ( isset( $options['GROUP BY'] ) ) { |
| 1206 | $gb = is_array( $options['GROUP BY'] ) |
| 1207 | ? implode( ',', $options['GROUP BY'] ) |
| 1208 | : $options['GROUP BY']; |
| 1209 | $sql .= ' GROUP BY ' . $gb; |
| 1210 | } |
| 1211 | if ( isset( $options['HAVING'] ) ) { |
| 1212 | $having = is_array( $options['HAVING'] ) |
| 1213 | ? $this->makeList( $options['HAVING'], self::LIST_AND ) |
| 1214 | : $options['HAVING']; |
| 1215 | $sql .= ' HAVING ' . $having; |
| 1216 | } |
| 1217 | |
| 1218 | return $sql; |
| 1219 | } |
| 1220 | |
| 1221 | /** |
| 1222 | * Returns an optional ORDER BY |
| 1223 | * |
| 1224 | * @param array $options Associative array of options |
| 1225 | * @return string |
| 1226 | * @see Database::select() |
| 1227 | * @since 1.21 |
| 1228 | */ |
| 1229 | protected function makeOrderBy( $options ) { |
| 1230 | if ( isset( $options['ORDER BY'] ) ) { |
| 1231 | $ob = is_array( $options['ORDER BY'] ) |
| 1232 | ? implode( ',', $options['ORDER BY'] ) |
| 1233 | : $options['ORDER BY']; |
| 1234 | |
| 1235 | return ' ORDER BY ' . $ob; |
| 1236 | } |
| 1237 | |
| 1238 | return ''; |
| 1239 | } |
| 1240 | |
| 1241 | public function buildGroupConcatField( |
| 1242 | $delim, $table, $field, $conds = '', $join_conds = [] |
| 1243 | ) { |
| 1244 | $fld = "GROUP_CONCAT($field SEPARATOR " . $this->quoter->addQuotes( $delim ) . ')'; |
| 1245 | |
| 1246 | return '(' . $this->selectSQLText( $table, $fld, $conds, __METHOD__, [], $join_conds ) . ')'; |
| 1247 | } |
| 1248 | |
| 1249 | public function buildSelectSubquery( |
| 1250 | $table, $vars, $conds = '', $fname = __METHOD__, |
| 1251 | $options = [], $join_conds = [] |
| 1252 | ) { |
| 1253 | return new Subquery( |
| 1254 | $this->selectSQLText( $table, $vars, $conds, $fname, $options, $join_conds ) |
| 1255 | ); |
| 1256 | } |
| 1257 | |
| 1258 | public function insertSqlText( $table, array $rows ) { |
| 1259 | $encTable = $this->tableName( $table ); |
| 1260 | [ $sqlColumns, $sqlTuples ] = $this->makeInsertLists( $rows ); |
| 1261 | |
| 1262 | return [ |
| 1263 | "INSERT INTO $encTable ($sqlColumns) VALUES $sqlTuples", |
| 1264 | "INSERT INTO $encTable ($sqlColumns) VALUES '?'" |
| 1265 | ]; |
| 1266 | } |
| 1267 | |
| 1268 | /** |
| 1269 | * Make SQL lists of columns, row tuples, and column aliases for INSERT/VALUES expressions |
| 1270 | * |
| 1271 | * The tuple column order is that of the columns of the first provided row. |
| 1272 | * The provided rows must have exactly the same keys and ordering thereof. |
| 1273 | * |
| 1274 | * @param array[] $rows Non-empty list of (column => value) maps |
| 1275 | * @param string $aliasPrefix Optional prefix to prepend to the magic alias names |
| 1276 | * @param string[] $typeByColumn Optional map of (column => data type) |
| 1277 | * @return array (comma-separated columns, comma-separated tuples, comma-separated aliases) |
| 1278 | * @since 1.35 |
| 1279 | */ |
| 1280 | public function makeInsertLists( array $rows, $aliasPrefix = '', array $typeByColumn = [] ) { |
| 1281 | $firstRow = $rows[0]; |
| 1282 | if ( !is_array( $firstRow ) || !$firstRow ) { |
| 1283 | throw new DBLanguageError( 'Got an empty row list or empty row' ); |
| 1284 | } |
| 1285 | // List of columns that define the value tuple ordering |
| 1286 | $tupleColumns = array_keys( $firstRow ); |
| 1287 | |
| 1288 | $valueTuples = []; |
| 1289 | foreach ( $rows as $row ) { |
| 1290 | $rowColumns = array_keys( $row ); |
| 1291 | // VALUES(...) requires a uniform correspondence of (column => value) |
| 1292 | if ( $rowColumns !== $tupleColumns ) { |
| 1293 | throw new DBLanguageError( |
| 1294 | 'Got row columns (' . implode( ', ', $rowColumns ) . ') ' . |
| 1295 | 'instead of expected (' . implode( ', ', $tupleColumns ) . ')' |
| 1296 | ); |
| 1297 | } |
| 1298 | // Make the value tuple that defines this row |
| 1299 | $valueTuples[] = '(' . $this->makeList( $row, self::LIST_COMMA ) . ')'; |
| 1300 | } |
| 1301 | |
| 1302 | $magicAliasFields = []; |
| 1303 | foreach ( $tupleColumns as $column ) { |
| 1304 | $magicAliasFields[] = $aliasPrefix . $column; |
| 1305 | } |
| 1306 | |
| 1307 | return [ |
| 1308 | $this->makeList( $tupleColumns, self::LIST_NAMES ), |
| 1309 | implode( ',', $valueTuples ), |
| 1310 | $this->makeList( $magicAliasFields, self::LIST_NAMES ) |
| 1311 | ]; |
| 1312 | } |
| 1313 | |
| 1314 | public function insertNonConflictingSqlText( $table, array $rows ) { |
| 1315 | $encTable = $this->tableName( $table ); |
| 1316 | [ $sqlColumns, $sqlTuples ] = $this->makeInsertLists( $rows ); |
| 1317 | [ $sqlVerb, $sqlOpts ] = $this->makeInsertNonConflictingVerbAndOptions(); |
| 1318 | |
| 1319 | return [ |
| 1320 | rtrim( "$sqlVerb $encTable ($sqlColumns) VALUES $sqlTuples $sqlOpts" ), |
| 1321 | rtrim( "$sqlVerb $encTable ($sqlColumns) VALUES '?' $sqlOpts" ) |
| 1322 | ]; |
| 1323 | } |
| 1324 | |
| 1325 | /** |
| 1326 | * @stable to override |
| 1327 | * @return string[] ("INSERT"-style SQL verb, "ON CONFLICT"-style clause or "") |
| 1328 | * @since 1.35 |
| 1329 | */ |
| 1330 | protected function makeInsertNonConflictingVerbAndOptions() { |
| 1331 | return [ 'INSERT IGNORE INTO', '' ]; |
| 1332 | } |
| 1333 | |
| 1334 | public function insertSelectNativeSqlText( |
| 1335 | $destTable, |
| 1336 | $srcTable, |
| 1337 | array $varMap, |
| 1338 | $conds, |
| 1339 | $fname, |
| 1340 | array $insertOptions, |
| 1341 | array $selectOptions, |
| 1342 | $selectJoinConds |
| 1343 | ) { |
| 1344 | [ $sqlVerb, $sqlOpts ] = $this->isFlagInOptions( 'IGNORE', $insertOptions ) |
| 1345 | ? $this->makeInsertNonConflictingVerbAndOptions() |
| 1346 | : [ 'INSERT INTO', '' ]; |
| 1347 | $encDstTable = $this->tableName( $destTable ); |
| 1348 | $sqlDstColumns = implode( ',', array_keys( $varMap ) ); |
| 1349 | $selectSql = $this->selectSQLText( |
| 1350 | $srcTable, |
| 1351 | array_values( $varMap ), |
| 1352 | $conds, |
| 1353 | $fname, |
| 1354 | $selectOptions, |
| 1355 | $selectJoinConds |
| 1356 | ); |
| 1357 | |
| 1358 | return rtrim( "$sqlVerb $encDstTable ($sqlDstColumns) $selectSql $sqlOpts" ); |
| 1359 | } |
| 1360 | |
| 1361 | /** |
| 1362 | * @param string $option Query option flag (e.g. "IGNORE" or "FOR UPDATE") |
| 1363 | * @param array $options Combination option/value map and boolean option list |
| 1364 | * @return bool Whether the option appears as an integer-keyed value in the options |
| 1365 | * @since 1.35 |
| 1366 | */ |
| 1367 | public function isFlagInOptions( $option, array $options ) { |
| 1368 | foreach ( array_keys( $options, $option, true ) as $k ) { |
| 1369 | if ( is_int( $k ) ) { |
| 1370 | return true; |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | return false; |
| 1375 | } |
| 1376 | |
| 1377 | /** |
| 1378 | * Build an SQL condition to find rows with matching key values to those in $rows. |
| 1379 | * |
| 1380 | * @param array[] $rows Non-empty list of rows |
| 1381 | * @param string[] $uniqueKey List of columns that define a single unique index |
| 1382 | * @return string |
| 1383 | */ |
| 1384 | public function makeKeyCollisionCondition( array $rows, array $uniqueKey ) { |
| 1385 | if ( !$rows ) { |
| 1386 | throw new DBLanguageError( "Empty row array" ); |
| 1387 | } elseif ( !$uniqueKey ) { |
| 1388 | throw new DBLanguageError( "Empty unique key array" ); |
| 1389 | } |
| 1390 | |
| 1391 | if ( count( $uniqueKey ) == 1 ) { |
| 1392 | // Use a simple IN(...) clause |
| 1393 | $column = reset( $uniqueKey ); |
| 1394 | $values = array_column( $rows, $column ); |
| 1395 | if ( count( $values ) !== count( $rows ) ) { |
| 1396 | throw new DBLanguageError( "Missing values for unique key ($column)" ); |
| 1397 | } |
| 1398 | |
| 1399 | return $this->makeList( [ $column => $values ], self::LIST_AND ); |
| 1400 | } |
| 1401 | |
| 1402 | $nullByUniqueKeyColumn = array_fill_keys( $uniqueKey, null ); |
| 1403 | |
| 1404 | $orConds = []; |
| 1405 | foreach ( $rows as $row ) { |
| 1406 | $rowKeyMap = array_intersect_key( $row, $nullByUniqueKeyColumn ); |
| 1407 | if ( count( $rowKeyMap ) != count( $uniqueKey ) ) { |
| 1408 | throw new DBLanguageError( |
| 1409 | "Missing values for unique key (" . implode( ',', $uniqueKey ) . ")" |
| 1410 | ); |
| 1411 | } |
| 1412 | $orConds[] = $this->makeList( $rowKeyMap, self::LIST_AND ); |
| 1413 | } |
| 1414 | |
| 1415 | return count( $orConds ) > 1 |
| 1416 | ? $this->makeList( $orConds, self::LIST_OR ) |
| 1417 | : $orConds[0]; |
| 1418 | } |
| 1419 | |
| 1420 | public function deleteJoinSqlText( $delTable, $joinTable, $delVar, $joinVar, $conds ) { |
| 1421 | if ( !$conds ) { |
| 1422 | throw new DBLanguageError( __METHOD__ . ' called with empty $conds' ); |
| 1423 | } |
| 1424 | |
| 1425 | $delTable = $this->tableName( $delTable ); |
| 1426 | $joinTable = $this->tableName( $joinTable ); |
| 1427 | $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable "; |
| 1428 | if ( $conds != '*' ) { |
| 1429 | $sql .= 'WHERE ' . $this->makeList( $conds, self::LIST_AND ); |
| 1430 | } |
| 1431 | $sql .= ')'; |
| 1432 | |
| 1433 | return $sql; |
| 1434 | } |
| 1435 | |
| 1436 | /** |
| 1437 | * @param string $table |
| 1438 | * @param string|array $conds |
| 1439 | * @return Query |
| 1440 | */ |
| 1441 | public function deleteSqlText( $table, $conds ) { |
| 1442 | $isCondValid = ( is_string( $conds ) || is_array( $conds ) ) && $conds; |
| 1443 | if ( !$isCondValid ) { |
| 1444 | throw new DBLanguageError( __METHOD__ . ' called with empty conditions' ); |
| 1445 | } |
| 1446 | |
| 1447 | $encTable = $this->tableName( $table ); |
| 1448 | $sql = "DELETE FROM $encTable"; |
| 1449 | |
| 1450 | $condsSql = ''; |
| 1451 | $cleanCondsSql = ''; |
| 1452 | if ( $conds !== self::ALL_ROWS && $conds !== [ self::ALL_ROWS ] ) { |
| 1453 | $cleanCondsSql = ' WHERE ' . $this->scrubArray( $conds ); |
| 1454 | if ( is_array( $conds ) ) { |
| 1455 | $conds = $this->makeList( $conds, self::LIST_AND ); |
| 1456 | } |
| 1457 | $condsSql .= ' WHERE ' . $conds; |
| 1458 | } |
| 1459 | return new Query( |
| 1460 | $sql . $condsSql, |
| 1461 | self::QUERY_CHANGE_ROWS, |
| 1462 | 'DELETE', |
| 1463 | $table, |
| 1464 | $sql . $cleanCondsSql |
| 1465 | ); |
| 1466 | } |
| 1467 | |
| 1468 | private function scrubArray( $array, $listType = self::LIST_AND ) { |
| 1469 | if ( is_array( $array ) ) { |
| 1470 | $scrubbedArray = []; |
| 1471 | foreach ( $array as $key => $value ) { |
| 1472 | if ( $value instanceof IExpression ) { |
| 1473 | $scrubbedArray[$key] = $value->toGeneralizedSql(); |
| 1474 | } else { |
| 1475 | $scrubbedArray[$key] = '?'; |
| 1476 | } |
| 1477 | } |
| 1478 | return $this->makeList( $scrubbedArray, $listType ); |
| 1479 | } |
| 1480 | return '?'; |
| 1481 | } |
| 1482 | |
| 1483 | public function updateSqlText( $table, $set, $conds, $options ) { |
| 1484 | $isCondValid = ( is_string( $conds ) || is_array( $conds ) ) && $conds; |
| 1485 | if ( !$isCondValid ) { |
| 1486 | throw new DBLanguageError( __METHOD__ . ' called with empty conditions' ); |
| 1487 | } |
| 1488 | $encTable = $this->tableName( $table ); |
| 1489 | $opts = $this->makeUpdateOptions( $options ); |
| 1490 | $sql = "UPDATE $opts $encTable"; |
| 1491 | $condsSql = " SET " . $this->makeList( $set, self::LIST_SET ); |
| 1492 | $cleanCondsSql = " SET " . $this->scrubArray( $set, self::LIST_SET ); |
| 1493 | |
| 1494 | if ( $conds && $conds !== self::ALL_ROWS && $conds !== [ self::ALL_ROWS ] ) { |
| 1495 | $cleanCondsSql .= ' WHERE ' . $this->scrubArray( $conds ); |
| 1496 | if ( is_array( $conds ) ) { |
| 1497 | $conds = $this->makeList( $conds, self::LIST_AND ); |
| 1498 | } |
| 1499 | $condsSql .= ' WHERE ' . $conds; |
| 1500 | } |
| 1501 | return new Query( |
| 1502 | $sql . $condsSql, |
| 1503 | self::QUERY_CHANGE_ROWS, |
| 1504 | 'UPDATE', |
| 1505 | $table, |
| 1506 | $sql . $cleanCondsSql |
| 1507 | ); |
| 1508 | } |
| 1509 | |
| 1510 | /** |
| 1511 | * Make UPDATE options for the Database::update function |
| 1512 | * |
| 1513 | * @param array $options The options passed to Database::update |
| 1514 | * @return string |
| 1515 | */ |
| 1516 | protected function makeUpdateOptions( $options ) { |
| 1517 | $opts = $this->makeUpdateOptionsArray( $options ); |
| 1518 | |
| 1519 | return implode( ' ', $opts ); |
| 1520 | } |
| 1521 | |
| 1522 | /** |
| 1523 | * Make UPDATE options array for Database::makeUpdateOptions |
| 1524 | * |
| 1525 | * @stable to override |
| 1526 | * @param array $options |
| 1527 | * @return array |
| 1528 | */ |
| 1529 | protected function makeUpdateOptionsArray( $options ) { |
| 1530 | $options = $this->normalizeOptions( $options ); |
| 1531 | |
| 1532 | $opts = []; |
| 1533 | |
| 1534 | if ( in_array( 'IGNORE', $options ) ) { |
| 1535 | $opts[] = 'IGNORE'; |
| 1536 | } |
| 1537 | |
| 1538 | return $opts; |
| 1539 | } |
| 1540 | |
| 1541 | /** |
| 1542 | * @param string|array $options |
| 1543 | * @return array Combination option/value map and boolean option list |
| 1544 | * @since 1.35, moved to SQLPlatform in 1.39 |
| 1545 | */ |
| 1546 | final public function normalizeOptions( $options ) { |
| 1547 | if ( is_array( $options ) ) { |
| 1548 | return $options; |
| 1549 | } elseif ( is_string( $options ) ) { |
| 1550 | return ( $options === '' ) ? [] : [ $options ]; |
| 1551 | } else { |
| 1552 | throw new DBLanguageError( __METHOD__ . ': expected string or array' ); |
| 1553 | } |
| 1554 | } |
| 1555 | |
| 1556 | public function dropTableSqlText( $table ) { |
| 1557 | // https://mariadb.com/kb/en/drop-table/ |
| 1558 | // https://dev.mysql.com/doc/refman/8.0/en/drop-table.html |
| 1559 | // https://www.postgresql.org/docs/9.2/sql-truncate.html |
| 1560 | return "DROP TABLE " . $this->tableName( $table ) . " CASCADE"; |
| 1561 | } |
| 1562 | |
| 1563 | /** |
| 1564 | * @param string $sql SQL query |
| 1565 | * @return string|null |
| 1566 | * @deprecated Since 1.42 |
| 1567 | */ |
| 1568 | public function getQueryVerb( $sql ) { |
| 1569 | wfDeprecated( __METHOD__, '1.42' ); |
| 1570 | return QueryBuilderFromRawSql::buildQuery( $sql, 0 )->getVerb(); |
| 1571 | } |
| 1572 | |
| 1573 | /** |
| 1574 | * Determine whether a SQL statement is sensitive to isolation level. |
| 1575 | * |
| 1576 | * A SQL statement is considered transactable if its result could vary |
| 1577 | * depending on the transaction isolation level. Operational commands |
| 1578 | * such as 'SET' and 'SHOW' are not considered to be transactable. |
| 1579 | * |
| 1580 | * Main purpose: Used by query() to decide whether to begin a transaction |
| 1581 | * before the current query (in DBO_TRX mode, on by default). |
| 1582 | * |
| 1583 | * @return bool |
| 1584 | */ |
| 1585 | public function isTransactableQuery( Query $sql ) { |
| 1586 | return !in_array( |
| 1587 | $sql->getVerb(), |
| 1588 | [ |
| 1589 | 'BEGIN', |
| 1590 | 'ROLLBACK', |
| 1591 | 'ROLLBACK TO SAVEPOINT', |
| 1592 | 'COMMIT', |
| 1593 | 'SET', |
| 1594 | 'SHOW', |
| 1595 | 'CREATE', |
| 1596 | 'ALTER', |
| 1597 | 'USE', |
| 1598 | 'SHOW' |
| 1599 | ], |
| 1600 | true |
| 1601 | ); |
| 1602 | } |
| 1603 | |
| 1604 | public function buildExcludedValue( $column ) { |
| 1605 | /* @see Database::upsert() */ |
| 1606 | // This can be treated like a single value since __VALS is a single row table |
| 1607 | return "(SELECT __$column FROM __VALS)"; |
| 1608 | } |
| 1609 | |
| 1610 | public function savepointSqlText( $identifier ) { |
| 1611 | return 'SAVEPOINT ' . $this->addIdentifierQuotes( $identifier ); |
| 1612 | } |
| 1613 | |
| 1614 | public function releaseSavepointSqlText( $identifier ) { |
| 1615 | return 'RELEASE SAVEPOINT ' . $this->addIdentifierQuotes( $identifier ); |
| 1616 | } |
| 1617 | |
| 1618 | public function rollbackToSavepointSqlText( $identifier ) { |
| 1619 | return 'ROLLBACK TO SAVEPOINT ' . $this->addIdentifierQuotes( $identifier ); |
| 1620 | } |
| 1621 | |
| 1622 | public function rollbackSqlText() { |
| 1623 | return 'ROLLBACK'; |
| 1624 | } |
| 1625 | |
| 1626 | public function dispatchingInsertSqlText( $table, $rows, $options ) { |
| 1627 | $rows = $this->normalizeRowArray( $rows ); |
| 1628 | if ( !$rows ) { |
| 1629 | return false; |
| 1630 | } |
| 1631 | |
| 1632 | $options = $this->normalizeOptions( $options ); |
| 1633 | if ( $this->isFlagInOptions( 'IGNORE', $options ) ) { |
| 1634 | [ $sql, $cleanSql ] = $this->insertNonConflictingSqlText( $table, $rows ); |
| 1635 | } else { |
| 1636 | [ $sql, $cleanSql ] = $this->insertSqlText( $table, $rows ); |
| 1637 | } |
| 1638 | return new Query( $sql, self::QUERY_CHANGE_ROWS, 'INSERT', $table, $cleanSql ); |
| 1639 | } |
| 1640 | |
| 1641 | /** |
| 1642 | * @param array $rowOrRows A single (field => value) map or a list of such maps |
| 1643 | * @return array[] List of (field => value) maps |
| 1644 | * @since 1.35 |
| 1645 | */ |
| 1646 | final protected function normalizeRowArray( array $rowOrRows ) { |
| 1647 | if ( !$rowOrRows ) { |
| 1648 | $rows = []; |
| 1649 | } elseif ( isset( $rowOrRows[0] ) ) { |
| 1650 | $rows = $rowOrRows; |
| 1651 | } else { |
| 1652 | $rows = [ $rowOrRows ]; |
| 1653 | } |
| 1654 | |
| 1655 | foreach ( $rows as $row ) { |
| 1656 | if ( !is_array( $row ) ) { |
| 1657 | throw new DBLanguageError( "Got non-array in row array" ); |
| 1658 | } elseif ( !$row ) { |
| 1659 | throw new DBLanguageError( "Got empty array in row array" ); |
| 1660 | } |
| 1661 | } |
| 1662 | |
| 1663 | return $rows; |
| 1664 | } |
| 1665 | |
| 1666 | /** |
| 1667 | * Validate and normalize parameters to upsert() or replace() |
| 1668 | * |
| 1669 | * @param string|string[]|string[][] $uniqueKeys Unique indexes (only one is allowed) |
| 1670 | * @param array[] &$rows The row array, which will be replaced with a normalized version. |
| 1671 | * @return string[] List of columns that defines a single unique index |
| 1672 | * @since 1.35 |
| 1673 | */ |
| 1674 | final public function normalizeUpsertParams( $uniqueKeys, &$rows ) { |
| 1675 | $rows = $this->normalizeRowArray( $rows ); |
| 1676 | if ( !$uniqueKeys ) { |
| 1677 | throw new DBLanguageError( 'No unique key specified for upsert/replace' ); |
| 1678 | } |
| 1679 | $uniqueKey = $this->normalizeUpsertKeys( $uniqueKeys ); |
| 1680 | $this->assertValidUpsertRowArray( $rows, $uniqueKey ); |
| 1681 | |
| 1682 | return $uniqueKey; |
| 1683 | } |
| 1684 | |
| 1685 | /** |
| 1686 | * @param array|string $conds |
| 1687 | * @param string $fname |
| 1688 | * @return array |
| 1689 | * @since 1.31 |
| 1690 | */ |
| 1691 | final public function normalizeConditions( $conds, $fname ) { |
| 1692 | if ( $conds === null || $conds === false ) { |
| 1693 | $this->logger->warning( |
| 1694 | __METHOD__ |
| 1695 | . ' called from ' |
| 1696 | . $fname |
| 1697 | . ' with incorrect parameters: $conds must be a string or an array', |
| 1698 | [ 'db_log_category' => 'sql' ] |
| 1699 | ); |
| 1700 | return []; |
| 1701 | } elseif ( $conds === '' ) { |
| 1702 | return []; |
| 1703 | } |
| 1704 | |
| 1705 | return is_array( $conds ) ? $conds : [ $conds ]; |
| 1706 | } |
| 1707 | |
| 1708 | /** |
| 1709 | * @param string|string[]|string[][] $uniqueKeys Unique indexes (only one is allowed) |
| 1710 | * @return string[] List of columns that defines a single unique index |
| 1711 | * @since 1.35 |
| 1712 | */ |
| 1713 | private function normalizeUpsertKeys( $uniqueKeys ) { |
| 1714 | if ( is_string( $uniqueKeys ) ) { |
| 1715 | return [ $uniqueKeys ]; |
| 1716 | } elseif ( !is_array( $uniqueKeys ) ) { |
| 1717 | throw new DBLanguageError( 'Invalid unique key array' ); |
| 1718 | } else { |
| 1719 | if ( count( $uniqueKeys ) !== 1 || !isset( $uniqueKeys[0] ) ) { |
| 1720 | throw new DBLanguageError( |
| 1721 | "The unique key array should contain a single unique index" ); |
| 1722 | } |
| 1723 | |
| 1724 | $uniqueKey = $uniqueKeys[0]; |
| 1725 | if ( is_string( $uniqueKey ) ) { |
| 1726 | // Passing a list of strings for single-column unique keys is too |
| 1727 | // easily confused with passing the columns of composite unique key |
| 1728 | $this->logger->warning( __METHOD__ . |
| 1729 | " called with deprecated parameter style: " . |
| 1730 | "the unique key array should be a string or array of string arrays", |
| 1731 | [ |
| 1732 | 'exception' => new RuntimeException(), |
| 1733 | 'db_log_category' => 'sql', |
| 1734 | ] ); |
| 1735 | return $uniqueKeys; |
| 1736 | } elseif ( is_array( $uniqueKey ) ) { |
| 1737 | return $uniqueKey; |
| 1738 | } else { |
| 1739 | throw new DBLanguageError( 'Invalid unique key array entry' ); |
| 1740 | } |
| 1741 | } |
| 1742 | } |
| 1743 | |
| 1744 | /** |
| 1745 | * @param array<int,array> $rows Normalized list of rows to insert |
| 1746 | * @param string[] $uniqueKey Columns of the unique key to UPSERT upon |
| 1747 | * @since 1.37 |
| 1748 | */ |
| 1749 | final protected function assertValidUpsertRowArray( array $rows, array $uniqueKey ) { |
| 1750 | foreach ( $rows as $row ) { |
| 1751 | foreach ( $uniqueKey as $column ) { |
| 1752 | if ( !isset( $row[$column] ) ) { |
| 1753 | throw new DBLanguageError( |
| 1754 | "NULL/absent values for unique key (" . implode( ',', $uniqueKey ) . ")" |
| 1755 | ); |
| 1756 | } |
| 1757 | } |
| 1758 | } |
| 1759 | } |
| 1760 | |
| 1761 | /** |
| 1762 | * @param array $set Combined column/literal assignment map and SQL assignment list |
| 1763 | * @param string[] $uniqueKey Columns of the unique key to UPSERT upon |
| 1764 | * @param array<int,array> $rows List of rows to upsert |
| 1765 | * @since 1.37 |
| 1766 | */ |
| 1767 | final public function assertValidUpsertSetArray( |
| 1768 | array $set, |
| 1769 | array $uniqueKey, |
| 1770 | array $rows |
| 1771 | ) { |
| 1772 | if ( !$set ) { |
| 1773 | throw new DBLanguageError( "Update assignment list can't be empty for upsert" ); |
| 1774 | } |
| 1775 | |
| 1776 | // Sloppy callers might construct the SET array using the ROW array, leaving redundant |
| 1777 | // column definitions for unique key columns. Detect this for backwards compatibility. |
| 1778 | $soleRow = ( count( $rows ) == 1 ) ? reset( $rows ) : null; |
| 1779 | // Disallow value changes for any columns in the unique key. This avoids additional |
| 1780 | // insertion order dependencies that are unwieldy and difficult to implement efficiently |
| 1781 | // in PostgreSQL. |
| 1782 | foreach ( $set as $k => $v ) { |
| 1783 | if ( is_string( $k ) ) { |
| 1784 | // Key is a column name and value is a literal (e.g. string, int, null, ...) |
| 1785 | if ( in_array( $k, $uniqueKey, true ) ) { |
| 1786 | if ( $soleRow && array_key_exists( $k, $soleRow ) && $soleRow[$k] === $v ) { |
| 1787 | $this->logger->warning( |
| 1788 | __METHOD__ . " called with redundant assignment to column '$k'", |
| 1789 | [ |
| 1790 | 'exception' => new RuntimeException(), |
| 1791 | 'db_log_category' => 'sql', |
| 1792 | ] |
| 1793 | ); |
| 1794 | } else { |
| 1795 | throw new DBLanguageError( |
| 1796 | "Cannot reassign column '$k' since it belongs to the provided unique key" |
| 1797 | ); |
| 1798 | } |
| 1799 | } |
| 1800 | } elseif ( preg_match( '/^([a-zA-Z0-9_]+)\s*=/', $v, $m ) ) { |
| 1801 | // Value is of the form "<unquoted alphanumeric column> = <SQL expression>" |
| 1802 | if ( in_array( $m[1], $uniqueKey, true ) ) { |
| 1803 | throw new DBLanguageError( |
| 1804 | "Cannot reassign column '{$m[1]}' since it belongs to the provided unique key" |
| 1805 | ); |
| 1806 | } |
| 1807 | } |
| 1808 | } |
| 1809 | } |
| 1810 | |
| 1811 | /** |
| 1812 | * @param array|string $var Field parameter in the style of select() |
| 1813 | * @return string|null Column name or null; ignores aliases |
| 1814 | */ |
| 1815 | final public function extractSingleFieldFromList( $var ) { |
| 1816 | if ( is_array( $var ) ) { |
| 1817 | if ( !$var ) { |
| 1818 | $column = null; |
| 1819 | } elseif ( count( $var ) == 1 ) { |
| 1820 | $column = $var[0] ?? reset( $var ); |
| 1821 | } else { |
| 1822 | throw new DBLanguageError( __METHOD__ . ': got multiple columns' ); |
| 1823 | } |
| 1824 | } else { |
| 1825 | $column = $var; |
| 1826 | } |
| 1827 | |
| 1828 | return $column; |
| 1829 | } |
| 1830 | |
| 1831 | public function setSchemaVars( $vars ) { |
| 1832 | $this->schemaVars = is_array( $vars ) ? $vars : null; |
| 1833 | } |
| 1834 | |
| 1835 | /** |
| 1836 | * Get schema variables. If none have been set via setSchemaVars(), then |
| 1837 | * use some defaults from the current object. |
| 1838 | * |
| 1839 | * @return array |
| 1840 | */ |
| 1841 | protected function getSchemaVars() { |
| 1842 | return $this->schemaVars ?? $this->getDefaultSchemaVars(); |
| 1843 | } |
| 1844 | |
| 1845 | /** |
| 1846 | * Get schema variables to use if none have been set via setSchemaVars(). |
| 1847 | * |
| 1848 | * Override this in derived classes to provide variables for tables.sql |
| 1849 | * and SQL patch files. |
| 1850 | * |
| 1851 | * @stable to override |
| 1852 | * @return array |
| 1853 | */ |
| 1854 | protected function getDefaultSchemaVars() { |
| 1855 | return []; |
| 1856 | } |
| 1857 | |
| 1858 | /** |
| 1859 | * Database-independent variable replacement. Replaces a set of variables |
| 1860 | * in an SQL statement with their contents as given by $this->getSchemaVars(). |
| 1861 | * |
| 1862 | * Supports '{$var}' `{$var}` and / *$var* / (without the spaces) style variables. |
| 1863 | * |
| 1864 | * - '{$var}' should be used for text and is passed through the database's |
| 1865 | * addQuotes method. |
| 1866 | * - `{$var}` should be used for identifiers (e.g. table and database names). |
| 1867 | * It is passed through the database's addIdentifierQuotes method which |
| 1868 | * can be overridden if the database uses something other than backticks. |
| 1869 | * - / *_* / or / *$wgDBprefix* / passes the name that follows through the |
| 1870 | * database's tableName method. |
| 1871 | * - / *i* / passes the name that follows through the database's indexName method. |
| 1872 | * - In all other cases, / *$var* / is left unencoded. Except for table options, |
| 1873 | * its use should be avoided. In 1.24 and older, string encoding was applied. |
| 1874 | * |
| 1875 | * @param string $ins SQL statement to replace variables in |
| 1876 | * @return string The new SQL statement with variables replaced |
| 1877 | */ |
| 1878 | public function replaceVars( $ins ) { |
| 1879 | $vars = $this->getSchemaVars(); |
| 1880 | return preg_replace_callback( |
| 1881 | '! |
| 1882 | /\* (\$wgDBprefix|[_i]) \*/ (\w*) | # 1-2. tableName, indexName |
| 1883 | \'\{\$ (\w+) }\' | # 3. addQuotes |
| 1884 | `\{\$ (\w+) }` | # 4. addIdentifierQuotes |
| 1885 | /\*\$ (\w+) \*/ # 5. leave unencoded |
| 1886 | !x', |
| 1887 | function ( $m ) use ( $vars ) { |
| 1888 | // Note: Because of <https://bugs.php.net/bug.php?id=51881>, |
| 1889 | // check for both nonexistent keys *and* the empty string. |
| 1890 | if ( isset( $m[1] ) && $m[1] !== '' ) { |
| 1891 | if ( $m[1] === 'i' ) { |
| 1892 | return $this->indexName( $m[2] ); |
| 1893 | } else { |
| 1894 | return $this->tableName( $m[2] ); |
| 1895 | } |
| 1896 | } elseif ( isset( $m[3] ) && $m[3] !== '' && array_key_exists( $m[3], $vars ) ) { |
| 1897 | return $this->quoter->addQuotes( $vars[$m[3]] ); |
| 1898 | } elseif ( isset( $m[4] ) && $m[4] !== '' && array_key_exists( $m[4], $vars ) ) { |
| 1899 | return $this->addIdentifierQuotes( $vars[$m[4]] ); |
| 1900 | } elseif ( isset( $m[5] ) && $m[5] !== '' && array_key_exists( $m[5], $vars ) ) { |
| 1901 | return $vars[$m[5]]; |
| 1902 | } else { |
| 1903 | return $m[0]; |
| 1904 | } |
| 1905 | }, |
| 1906 | $ins |
| 1907 | ); |
| 1908 | } |
| 1909 | |
| 1910 | public function lockSQLText( $lockName, $timeout ) { |
| 1911 | throw new RuntimeException( 'locking must be implemented in subclasses' ); |
| 1912 | } |
| 1913 | |
| 1914 | public function lockIsFreeSQLText( $lockName ) { |
| 1915 | throw new RuntimeException( 'locking must be implemented in subclasses' ); |
| 1916 | } |
| 1917 | |
| 1918 | public function unlockSQLText( $lockName ) { |
| 1919 | throw new RuntimeException( 'locking must be implemented in subclasses' ); |
| 1920 | } |
| 1921 | } |