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| 1 | <?php |
| 2 | /** |
| 3 | * This file contains database access object related constants. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | * |
| 20 | * @file |
| 21 | * @ingroup Database |
| 22 | */ |
| 23 | |
| 24 | namespace Wikimedia\Rdbms; |
| 25 | |
| 26 | use InvalidArgumentException; |
| 27 | |
| 28 | /** |
| 29 | * Helper class for DAO classes |
| 30 | * |
| 31 | * @since 1.26 |
| 32 | */ |
| 33 | class DBAccessObjectUtils implements IDBAccessObject { |
| 34 | /** |
| 35 | * @param int $bitfield |
| 36 | * @param int $flags IDBAccessObject::READ_* constant |
| 37 | * @return bool Bitfield has flag $flag set |
| 38 | */ |
| 39 | public static function hasFlags( $bitfield, $flags ) { |
| 40 | return ( $bitfield & $flags ) == $flags; |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Get an appropriate DB index and options |
| 45 | * |
| 46 | * @deprecated since 1.43 |
| 47 | * @param int $bitfield Bitfield of IDBAccessObject::READ_* constants |
| 48 | * @return array List of DB indexes and options in this order: |
| 49 | * - DB_PRIMARY or DB_REPLICA constant for the initial query |
| 50 | * - SELECT options array for the initial query |
| 51 | */ |
| 52 | public static function getDBOptions( $bitfield ) { |
| 53 | wfDeprecated( __METHOD__, '1.43' ); |
| 54 | if ( self::hasFlags( $bitfield, IDBAccessObject::READ_LATEST_IMMUTABLE ) ) { |
| 55 | $index = DB_REPLICA; // override READ_LATEST if set |
| 56 | } elseif ( self::hasFlags( $bitfield, IDBAccessObject::READ_LATEST ) ) { |
| 57 | $index = DB_PRIMARY; |
| 58 | } else { |
| 59 | $index = DB_REPLICA; |
| 60 | } |
| 61 | |
| 62 | $lockingOptions = []; |
| 63 | if ( self::hasFlags( $bitfield, IDBAccessObject::READ_EXCLUSIVE ) ) { |
| 64 | $lockingOptions[] = 'FOR UPDATE'; |
| 65 | } elseif ( self::hasFlags( $bitfield, IDBAccessObject::READ_LOCKING ) ) { |
| 66 | $lockingOptions[] = 'LOCK IN SHARE MODE'; |
| 67 | } |
| 68 | |
| 69 | return [ $index, $lockingOptions ]; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Takes $index from ::getDBOptions() and return proper Database object |
| 74 | * |
| 75 | * @deprecated since 1.42 |
| 76 | * |
| 77 | * @param IConnectionProvider $dbProvider |
| 78 | * @param int $index either DB_REPLICA or DB_PRIMARY |
| 79 | * @return IReadableDatabase |
| 80 | */ |
| 81 | public static function getDBFromIndex( IConnectionProvider $dbProvider, int $index ): IReadableDatabase { |
| 82 | wfDeprecated( __METHOD__, '1.42' ); |
| 83 | if ( $index === DB_PRIMARY ) { |
| 84 | return $dbProvider->getPrimaryDatabase(); |
| 85 | } elseif ( $index === DB_REPLICA ) { |
| 86 | return $dbProvider->getReplicaDatabase(); |
| 87 | } else { |
| 88 | throw new InvalidArgumentException( '$index must be either DB_REPLICA or DB_PRIMARY' ); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @param IConnectionProvider $dbProvider |
| 94 | * @param int $recency IDBAccessObject::READ_* constant |
| 95 | * @return IReadableDatabase |
| 96 | * @since 1.42 |
| 97 | */ |
| 98 | public static function getDBFromRecency( IConnectionProvider $dbProvider, int $recency ): IReadableDatabase { |
| 99 | if ( self::hasFlags( $recency, IDBAccessObject::READ_LATEST ) ) { |
| 100 | return $dbProvider->getPrimaryDatabase(); |
| 101 | } |
| 102 | return $dbProvider->getReplicaDatabase(); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | /** @deprecated class alias since 1.43 */ |
| 107 | class_alias( DBAccessObjectUtils::class, 'DBAccessObjectUtils' ); |