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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | namespace Wikimedia\Rdbms\Platform; |
| 7 | |
| 8 | use Wikimedia\Rdbms\DBLanguageError; |
| 9 | use Wikimedia\Rdbms\Query; |
| 10 | |
| 11 | /** |
| 12 | * @since 1.39 |
| 13 | * @see ISQLPlatform |
| 14 | */ |
| 15 | class MySQLPlatform extends SQLPlatform { |
| 16 | /** @inheritDoc */ |
| 17 | protected function getIdentifierQuoteChar() { |
| 18 | return '`'; |
| 19 | } |
| 20 | |
| 21 | /** @inheritDoc */ |
| 22 | public function buildStringCast( $field ) { |
| 23 | return "CAST( $field AS BINARY )"; |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * @param string $field Field or column to cast |
| 28 | * @return string |
| 29 | */ |
| 30 | public function buildIntegerCast( $field ) { |
| 31 | return 'CAST( ' . $field . ' AS SIGNED )'; |
| 32 | } |
| 33 | |
| 34 | /** @inheritDoc */ |
| 35 | protected function normalizeJoinType( string $joinType ) { |
| 36 | switch ( strtoupper( $joinType ) ) { |
| 37 | case 'STRAIGHT_JOIN': |
| 38 | case 'STRAIGHT JOIN': |
| 39 | return 'STRAIGHT_JOIN'; |
| 40 | |
| 41 | default: |
| 42 | return parent::normalizeJoinType( $joinType ); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * @param string $index |
| 48 | * @return string |
| 49 | */ |
| 50 | public function useIndexClause( $index ) { |
| 51 | return "FORCE INDEX (" . $index . ")"; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * @param string $index |
| 56 | * @return string |
| 57 | */ |
| 58 | public function ignoreIndexClause( $index ) { |
| 59 | return "IGNORE INDEX (" . $index . ")"; |
| 60 | } |
| 61 | |
| 62 | /** @inheritDoc */ |
| 63 | public function deleteJoinSqlText( $delTable, $joinTable, $delVar, $joinVar, $conds ) { |
| 64 | if ( !$conds ) { |
| 65 | throw new DBLanguageError( __METHOD__ . ' called with empty $conds' ); |
| 66 | } |
| 67 | |
| 68 | $delTable = $this->tableName( $delTable ); |
| 69 | $joinTable = $this->tableName( $joinTable ); |
| 70 | $sql = "DELETE $delTable FROM $delTable, $joinTable WHERE $delVar=$joinVar "; |
| 71 | |
| 72 | if ( $conds != '*' ) { |
| 73 | $sql .= ' AND ' . $this->makeList( $conds, self::LIST_AND ); |
| 74 | } |
| 75 | |
| 76 | return $sql; |
| 77 | } |
| 78 | |
| 79 | /** @inheritDoc */ |
| 80 | public function isTransactableQuery( Query $sql ) { |
| 81 | return parent::isTransactableQuery( $sql ) && |
| 82 | // TODO: Use query verb |
| 83 | !preg_match( '/^SELECT\s+(GET|RELEASE|IS_FREE)_LOCK\(/', $sql->getSQL() ); |
| 84 | } |
| 85 | |
| 86 | /** @inheritDoc */ |
| 87 | public function buildExcludedValue( $column ) { |
| 88 | /* @see DatabaseMySQL::upsert() */ |
| 89 | // Within "INSERT INTO ON DUPLICATE KEY UPDATE" statements: |
| 90 | // - MySQL>= 8.0.20 supports and prefers "VALUES ... AS". |
| 91 | // - MariaDB >= 10.3.3 supports and prefers VALUE(). |
| 92 | // - Both support the old VALUES() function |
| 93 | // https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html |
| 94 | // https://mariadb.com/kb/en/insert-on-duplicate-key-update/ |
| 95 | return "VALUES($column)"; |
| 96 | } |
| 97 | |
| 98 | /** @inheritDoc */ |
| 99 | public function lockSQLText( $lockName, $timeout ) { |
| 100 | $encName = $this->quoter->addQuotes( $this->makeLockName( $lockName ) ); |
| 101 | // Unlike NOW(), SYSDATE() gets the time at invocation rather than query start. |
| 102 | // The precision argument is silently ignored for MySQL < 5.6 and MariaDB < 5.3. |
| 103 | // https://dev.mysql.com/doc/refman/5.6/en/date-and-time-functions.html#function_sysdate |
| 104 | // https://dev.mysql.com/doc/refman/5.6/en/fractional-seconds.html |
| 105 | return "SELECT IF(GET_LOCK($encName,$timeout),UNIX_TIMESTAMP(SYSDATE(6)),NULL) AS acquired"; |
| 106 | } |
| 107 | |
| 108 | /** @inheritDoc */ |
| 109 | public function unlockSQLText( $lockName ) { |
| 110 | $encName = $this->quoter->addQuotes( $this->makeLockName( $lockName ) ); |
| 111 | return "SELECT RELEASE_LOCK($encName) AS released"; |
| 112 | } |
| 113 | |
| 114 | /** @inheritDoc */ |
| 115 | public function makeLockName( $lockName ) { |
| 116 | // https://dev.mysql.com/doc/refman/5.7/en/locking-functions.html#function_get-lock |
| 117 | // MySQL 5.7+ enforces a 64 char length limit. |
| 118 | return ( strlen( $lockName ) > 64 ) ? sha1( $lockName ) : $lockName; |
| 119 | } |
| 120 | } |