includes/db/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
  24 /**
  25  * Database abstraction object for PHP extension mysql.
  26  *
  27  * @ingroup Database
  28  * @see Database
  29  */
  30 class DatabaseMysql extends DatabaseMysqlBase {
  31         /**
  32          * @param string $sql
  33          * @return resource False on error
  34          */
  35         protected function doQuery( $sql ) {
  36                 $conn = $this->getBindingHandle();
  37
  38                 if ( $this->bufferResults() ) {
  39                         $ret = mysql_query( $sql, $conn );
  40                 } else {
  41                         $ret = mysql_unbuffered_query( $sql, $conn );
  42                 }
  43
  44                 return $ret;
  45         }
  46
  47         /**
  48          * @param string $realServer
  49          * @return bool|resource MySQL Database connection or false on failure to connect
  50          * @throws DBConnectionError
  51          */
  52         protected function mysqlConnect( $realServer ) {
  53                 # Avoid a suppressed fatal error, which is very hard to track down
  54                 if ( !extension_loaded( 'mysql' ) ) {
  55                         throw new DBConnectionError(
  56                                 $this,
  57                                 "MySQL functions missing, have you compiled PHP with the --with-mysql option?\n"
  58                         );
  59                 }
  60
  61                 $connFlags = 0;
  62                 if ( $this->mFlags & DBO_SSL ) {
  63                         $connFlags |= MYSQL_CLIENT_SSL;
  64                 }
  65                 if ( $this->mFlags & DBO_COMPRESS ) {
  66                         $connFlags |= MYSQL_CLIENT_COMPRESS;
  67                 }
  68
  69                 if ( ini_get( 'mysql.connect_timeout' ) <= 3 ) {
  70                         $numAttempts = 2;
  71                 } else {
  72                         $numAttempts = 1;
  73                 }
  74
  75                 $conn = false;
  76
  77                 # The kernel's default SYN retransmission period is far too slow for us,
  78                 # so we use a short timeout plus a manual retry. Retrying means that a small
  79                 # but finite rate of SYN packet loss won't cause user-visible errors.
  80                 for ( $i = 0; $i < $numAttempts && !$conn; $i++ ) {
  81                         if ( $i > 1 ) {
  82                                 usleep( 1000 );
  83                         }
  84                         if ( $this->mFlags & DBO_PERSISTENT ) {
  85                                 $conn = mysql_pconnect( $realServer, $this->mUser, $this->mPassword, $connFlags );
  86                         } else {
  87                                 # Create a new connection...
  88                                 $conn = mysql_connect( $realServer, $this->mUser, $this->mPassword, true, $connFlags );
  89                         }
  90                 }
  91
  92                 return $conn;
  93         }
  94
  95         /**
  96          * @param string $charset
  97          * @return bool
  98          */
  99         protected function mysqlSetCharset( $charset ) {
 100                 $conn = $this->getBindingHandle();
 101
 102                 if ( function_exists( 'mysql_set_charset' ) ) {
 103                         return mysql_set_charset( $charset, $conn );
 104                 } else {
 105                         return $this->query( 'SET NAMES ' . $charset, __METHOD__ );
 106                 }
 107         }
 108
 109         /**
 110          * @return bool
 111          */
 112         protected function closeConnection() {
 113                 $conn = $this->getBindingHandle();
 114
 115                 return mysql_close( $conn );
 116         }
 117
 118         /**
 119          * @return int
 120          */
 121         function insertId() {
 122                 $conn = $this->getBindingHandle();
 123
 124                 return mysql_insert_id( $conn );
 125         }
 126
 127         /**
 128          * @return int
 129          */
 130         function lastErrno() {
 131                 if ( $this->mConn ) {
 132                         return mysql_errno( $this->mConn );
 133                 } else {
 134                         return mysql_errno();
 135                 }
 136         }
 137
 138         /**
 139          * @return int
 140          */
 141         function affectedRows() {
 142                 $conn = $this->getBindingHandle();
 143
 144                 return mysql_affected_rows( $conn );
 145         }
 146
 147         /**
 148          * @param string $db
 149          * @return bool
 150          */
 151         function selectDB( $db ) {
 152                 $conn = $this->getBindingHandle();
 153
 154                 $this->mDBname = $db;
 155
 156                 return mysql_select_db( $db, $conn );
 157         }
 158
 159         protected function mysqlFreeResult( $res ) {
 160                 return mysql_free_result( $res );
 161         }
 162
 163         protected function mysqlFetchObject( $res ) {
 164                 return mysql_fetch_object( $res );
 165         }
 166
 167         protected function mysqlFetchArray( $res ) {
 168                 return mysql_fetch_array( $res );
 169         }
 170
 171         protected function mysqlNumRows( $res ) {
 172                 return mysql_num_rows( $res );
 173         }
 174
 175         protected function mysqlNumFields( $res ) {
 176                 return mysql_num_fields( $res );
 177         }
 178
 179         protected function mysqlFetchField( $res, $n ) {
 180                 return mysql_fetch_field( $res, $n );
 181         }
 182
 183         protected function mysqlFieldName( $res, $n ) {
 184                 return mysql_field_name( $res, $n );
 185         }
 186
 187         protected function mysqlFieldType( $res, $n ) {
 188                 return mysql_field_type( $res, $n );
 189         }
 190
 191         protected function mysqlDataSeek( $res, $row ) {
 192                 return mysql_data_seek( $res, $row );
 193         }
 194
 195         protected function mysqlError( $conn = null ) {
 196                 return ( $conn !== null ) ? mysql_error( $conn ) : mysql_error(); // avoid warning
 197         }
 198
 199         protected function mysqlRealEscapeString( $s ) {
 200                 $conn = $this->getBindingHandle();
 201
 202                 return mysql_real_escape_string( $s, $conn );
 203         }
 204
 205         protected function mysqlPing() {
 206                 $conn = $this->getBindingHandle();
 207
 208                 return mysql_ping( $conn );
 209         }
 210 }