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