includes/libs/rdbms/database/DatabaseMysql.php

   1 <?php
   2 /**
   3  * This is the MySQL database abstraction layer.
   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 namespace Wikimedia\Rdbms;
  24
  25 use DBConnectionError;
  26
  27 /**
  28  * Database abstraction object for PHP extension mysql.
  29  *
  30  * @ingroup Database
  31  * @see Database
  32  */
  33 class DatabaseMysql extends DatabaseMysqlBase {
  34         /**
  35          * @param string $sql
  36          * @return resource False on error
  37          */
  38         protected function doQuery( $sql ) {
  39                 $conn = $this->getBindingHandle();
  40
  41                 if ( $this->bufferResults() ) {
  42                         $ret = mysql_query( $sql, $conn );
  43                 } else {
  44                         $ret = mysql_unbuffered_query( $sql, $conn );
  45                 }
  46
  47                 return $ret;
  48         }
  49
  50         /**
  51          * @param string $realServer
  52          * @return bool|resource MySQL Database connection or false on failure to connect
  53          * @throws DBConnectionError
  54          */
  55         protected function mysqlConnect( $realServer ) {
  56                 # Avoid a suppressed fatal error, which is very hard to track down
  57                 if ( !extension_loaded( 'mysql' ) ) {
  58                         throw new DBConnectionError(
  59                                 $this,
  60                                 "MySQL functions missing, have you compiled PHP with the --with-mysql option?\n"
  61                         );
  62                 }
  63
  64                 $connFlags = 0;
  65                 if ( $this->mFlags & self::DBO_SSL ) {
  66                         $connFlags |= MYSQL_CLIENT_SSL;
  67                 }
  68                 if ( $this->mFlags & self::DBO_COMPRESS ) {
  69                         $connFlags |= MYSQL_CLIENT_COMPRESS;
  70                 }
  71
  72                 if ( ini_get( 'mysql.connect_timeout' ) <= 3 ) {
  73                         $numAttempts = 2;
  74                 } else {
  75                         $numAttempts = 1;
  76                 }
  77
  78                 $conn = false;
  79
  80                 # The kernel's default SYN retransmission period is far too slow for us,
  81                 # so we use a short timeout plus a manual retry. Retrying means that a small
  82                 # but finite rate of SYN packet loss won't cause user-visible errors.
  83                 for ( $i = 0; $i < $numAttempts && !$conn; $i++ ) {
  84                         if ( $i > 1 ) {
  85                                 usleep( 1000 );
  86                         }
  87                         if ( $this->mFlags & self::DBO_PERSISTENT ) {
  88                                 $conn = mysql_pconnect( $realServer, $this->mUser, $this->mPassword, $connFlags );
  89                         } else {
  90                                 # Create a new connection...
  91                                 $conn = mysql_connect( $realServer, $this->mUser, $this->mPassword, true, $connFlags );
  92                         }
  93                 }
  94
  95                 return $conn;
  96         }
  97
  98         /**
  99          * @param string $charset
 100          * @return bool
 101          */
 102         protected function mysqlSetCharset( $charset ) {
 103                 $conn = $this->getBindingHandle();
 104
 105                 if ( function_exists( 'mysql_set_charset' ) ) {
 106                         return mysql_set_charset( $charset, $conn );
 107                 } else {
 108                         return $this->query( 'SET NAMES ' . $charset, __METHOD__ );
 109                 }
 110         }
 111
 112         /**
 113          * @return bool
 114          */
 115         protected function closeConnection() {
 116                 $conn = $this->getBindingHandle();
 117
 118                 return mysql_close( $conn );
 119         }
 120
 121         /**
 122          * @return int
 123          */
 124         function insertId() {
 125                 $conn = $this->getBindingHandle();
 126
 127                 return mysql_insert_id( $conn );
 128         }
 129
 130         /**
 131          * @return int
 132          */
 133         function lastErrno() {
 134                 if ( $this->mConn ) {
 135                         return mysql_errno( $this->mConn );
 136                 } else {
 137                         return mysql_errno();
 138                 }
 139         }
 140
 141         /**
 142          * @return int
 143          */
 144         function affectedRows() {
 145                 $conn = $this->getBindingHandle();
 146
 147                 return mysql_affected_rows( $conn );
 148         }
 149
 150         /**
 151          * @param string $db
 152          * @return bool
 153          */
 154         function selectDB( $db ) {
 155                 $conn = $this->getBindingHandle();
 156
 157                 $this->mDBname = $db;
 158
 159                 return mysql_select_db( $db, $conn );
 160         }
 161
 162         protected function mysqlFreeResult( $res ) {
 163                 return mysql_free_result( $res );
 164         }
 165
 166         protected function mysqlFetchObject( $res ) {
 167                 return mysql_fetch_object( $res );
 168         }
 169
 170         protected function mysqlFetchArray( $res ) {
 171                 return mysql_fetch_array( $res );
 172         }
 173
 174         protected function mysqlNumRows( $res ) {
 175                 return mysql_num_rows( $res );
 176         }
 177
 178         protected function mysqlNumFields( $res ) {
 179                 return mysql_num_fields( $res );
 180         }
 181
 182         protected function mysqlFetchField( $res, $n ) {
 183                 return mysql_fetch_field( $res, $n );
 184         }
 185
 186         protected function mysqlFieldName( $res, $n ) {
 187                 return mysql_field_name( $res, $n );
 188         }
 189
 190         protected function mysqlFieldType( $res, $n ) {
 191                 return mysql_field_type( $res, $n );
 192         }
 193
 194         protected function mysqlDataSeek( $res, $row ) {
 195                 return mysql_data_seek( $res, $row );
 196         }
 197
 198         protected function mysqlError( $conn = null ) {
 199                 return ( $conn !== null ) ? mysql_error( $conn ) : mysql_error(); // avoid warning
 200         }
 201
 202         protected function mysqlRealEscapeString( $s ) {
 203                 $conn = $this->getBindingHandle();
 204
 205                 return mysql_real_escape_string( $s, $conn );
 206         }
 207 }
 208
 209 class_alias( DatabaseMysql::class, 'DatabaseMysql' );