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                 if ( $this->bufferResults() ) {
  37                         $ret = mysql_query( $sql, $this->mConn );
  38                 } else {
  39                         $ret = mysql_unbuffered_query( $sql, $this->mConn );
  40                 }
  41
  42                 return $ret;
  43         }
  44
  45         /**
  46          * @param string $realServer
  47          * @return bool|resource MySQL Database connection or false on failure to connect
  48          * @throws DBConnectionError
  49          */
  50         protected function mysqlConnect( $realServer ) {
  51                 # Fail now
  52                 # Otherwise we get a suppressed fatal error, which is very hard to track down
  53                 if ( !extension_loaded( 'mysql' ) ) {
  54                         throw new DBConnectionError(
  55                                 $this,
  56                                 "MySQL functions missing, have you compiled PHP with the --with-mysql option?\n"
  57                         );
  58                 }
  59
  60                 $connFlags = 0;
  61                 if ( $this->mFlags & DBO_SSL ) {
  62                         $connFlags |= MYSQL_CLIENT_SSL;
  63                 }
  64                 if ( $this->mFlags & DBO_COMPRESS ) {
  65                         $connFlags |= MYSQL_CLIENT_COMPRESS;
  66                 }
  67
  68                 if ( ini_get( 'mysql.connect_timeout' ) <= 3 ) {
  69                         $numAttempts = 2;
  70                 } else {
  71                         $numAttempts = 1;
  72                 }
  73
  74                 $conn = false;
  75
  76                 for ( $i = 0; $i < $numAttempts && !$conn; $i++ ) {
  77                         if ( $i > 1 ) {
  78                                 usleep( 1000 );
  79                         }
  80                         if ( $this->mFlags & DBO_PERSISTENT ) {
  81                                 $conn = mysql_pconnect( $realServer, $this->mUser, $this->mPassword, $connFlags );
  82                         } else {
  83                                 # Create a new connection...
  84                                 $conn = mysql_connect( $realServer, $this->mUser, $this->mPassword, true, $connFlags );
  85                         }
  86                 }
  87
  88                 return $conn;
  89         }
  90
  91         /**
  92          * @param string $charset
  93          * @return bool
  94          */
  95         protected function mysqlSetCharset( $charset ) {
  96                 if ( function_exists( 'mysql_set_charset' ) ) {
  97                         return mysql_set_charset( $charset, $this->mConn );
  98                 } else {
  99                         return $this->query( 'SET NAMES ' . $charset, __METHOD__ );
 100                 }
 101         }
 102
 103         /**
 104          * @return bool
 105          */
 106         protected function closeConnection() {
 107                 return mysql_close( $this->mConn );
 108         }
 109
 110         /**
 111          * @return int
 112          */
 113         function insertId() {
 114                 return mysql_insert_id( $this->mConn );
 115         }
 116
 117         /**
 118          * @return int
 119          */
 120         function lastErrno() {
 121                 if ( $this->mConn ) {
 122                         return mysql_errno( $this->mConn );
 123                 } else {
 124                         return mysql_errno();
 125                 }
 126         }
 127
 128         /**
 129          * @return int
 130          */
 131         function affectedRows() {
 132                 return mysql_affected_rows( $this->mConn );
 133         }
 134
 135         /**
 136          * @param string $db
 137          * @return bool
 138          */
 139         function selectDB( $db ) {
 140                 $this->mDBname = $db;
 141
 142                 return mysql_select_db( $db, $this->mConn );
 143         }
 144
 145         protected function mysqlFreeResult( $res ) {
 146                 return mysql_free_result( $res );
 147         }
 148
 149         protected function mysqlFetchObject( $res ) {
 150                 return mysql_fetch_object( $res );
 151         }
 152
 153         protected function mysqlFetchArray( $res ) {
 154                 return mysql_fetch_array( $res );
 155         }
 156
 157         protected function mysqlNumRows( $res ) {
 158                 return mysql_num_rows( $res );
 159         }
 160
 161         protected function mysqlNumFields( $res ) {
 162                 return mysql_num_fields( $res );
 163         }
 164
 165         protected function mysqlFetchField( $res, $n ) {
 166                 return mysql_fetch_field( $res, $n );
 167         }
 168
 169         protected function mysqlFieldName( $res, $n ) {
 170                 return mysql_field_name( $res, $n );
 171         }
 172
 173         protected function mysqlFieldType( $res, $n ) {
 174                 return mysql_field_type( $res, $n );
 175         }
 176
 177         protected function mysqlDataSeek( $res, $row ) {
 178                 return mysql_data_seek( $res, $row );
 179         }
 180
 181         protected function mysqlError( $conn = null ) {
 182                 return ( $conn !== null ) ? mysql_error( $conn ) : mysql_error(); // avoid warning
 183         }
 184
 185         protected function mysqlRealEscapeString( $s ) {
 186                 return mysql_real_escape_string( $s, $this->mConn );
 187         }
 188
 189         protected function mysqlPing() {
 190                 return mysql_ping( $this->mConn );
 191         }
 192 }