phpBB2/db/mssql.php

   1 <?php
   2 /***************************************************************************
   3  *                                 mssql.php
   4  *                            -------------------
   5  *   begin                : Saturday, Feb 13, 2001
   6  *   copyright            : (C) 2001 The phpBB Group
   7  *   email                : supportphpbb.com
   8  *
   9  *   $Id: mssql.php,v 1.22.2.4 2006/03/09 19:57:37 grahamje Exp $
  10  *
  11  ***************************************************************************/
  12
  13 /***************************************************************************
  14  *
  15  *   This program is free software; you can redistribute it and/or modify
  16  *   it under the terms of the GNU General Public License as published by
  17  *   the Free Software Foundation; either version 2 of the License, or
  18  *   (at your option) any later version.
  19  *
  20  ***************************************************************************/
  21
  22 if(!defined("SQL_LAYER"))
  23 {
  24
  25 define("SQL_LAYER","mssql");
  26
  27 class sql_db
  28 {
  29
  30         var $db_connect_id;
  31         var $result;
  32
  33         var $next_id;
  34         var $in_transaction = 0;
  35
  36         var $row = array();
  37         var $rowset = array();
  38         var $limit_offset;
  39         var $query_limit_success;
  40
  41         var $num_queries = 0;
  42
  43         //
  44         // Constructor
  45         //
  46         function sql_db($sqlserver, $sqluser, $sqlpassword, $database, $persistency = true)
  47         {
  48                 $this->persistency = $persistency;
  49                 $this->user = $sqluser;
  50                 $this->password = $sqlpassword;
  51                 $this->server = $sqlserver;
  52                 $this->dbname = $database;
  53
  54                 $this->db_connect_id = ( $this->persistency ) ? @mssql_pconnect($this->server, $this->user, $this->password) : @mssql_connect($this->server, $this->user, $this->password);
  55
  56                 if( $this->db_connect_id && $this->dbname != "" )
  57                 {
  58                         if( !mssql_select_db($this->dbname, $this->db_connect_id) )
  59                         {
  60                                 mssql_close($this->db_connect_id);
  61                                 return false;
  62                         }
  63                 }
  64
  65                 return $this->db_connect_id;
  66         }
  67
  68         //
  69         // Other base methods
  70         //
  71         function sql_close()
  72         {
  73                 if($this->db_connect_id)
  74                 {
  75                         //
  76                         // Commit any remaining transactions
  77                         //
  78                         if( $this->in_transaction )
  79                         {
  80                                 @mssql_query("COMMIT", $this->db_connect_id);
  81                         }
  82
  83                         return @mssql_close($this->db_connect_id);
  84                 }
  85                 else
  86                 {
  87                         return false;
  88                 }
  89         }
  90
  91
  92         //
  93         // Query method
  94         //
  95         function sql_query($query = '', $transaction = FALSE)
  96         {
  97                 //
  98                 // Remove any pre-existing queries
  99                 //
 100                 unset($this->result);
 101                 unset($this->row);
 102
 103                 if ( $query != '' )
 104                 {
 105                         $this->num_queries++;
 106
 107                         if ( $transaction == BEGIN_TRANSACTION && !$this->in_transaction )
 108                         {
 109                                 if ( !@mssql_query('BEGIN TRANSACTION', $this->db_connect_id) )
 110                                 {
 111                                         return false;
 112                                 }
 113                                 $this->in_transaction = TRUE;
 114                         }
 115
 116                         //
 117                         // Does query contain any LIMIT code? If so pull out relevant start and num_results
 118                         // This isn't terribly easy with MSSQL, whatever you do will potentially impact
 119                         // performance compared to an 'in-built' limit
 120                         //
 121                         // Another issue is the 'lack' of a returned true value when a query is valid but has
 122                         // no result set (as with all the other DB interfaces). It seems though that it's
 123                         // 'fair' to say that if a query returns a false result (ie. no resource id) then the
 124                         // SQL was valid but had no result set. If the query returns nothing but the rowcount
 125                         // returns something then there's a problem. This may well be a false assumption though
 126                         // ... needs checking under Windows itself.
 127                         //
 128                         if( preg_match('#^SELECT(.*?)(LIMIT ([0-9]+)[, ]*([0-9]+)*)?$#s', $query, $limits) )
 129                         {
 130                                 $query = $limits[1];
 131
 132                                 if( !empty($limits[2]) )
 133                                 {
 134                                         $row_offset = ( $limits[4] ) ? $limits[3] : "";
 135                                         $num_rows = ( $limits[4] ) ? $limits[4] : $limits[3];
 136
 137                                         $query = 'TOP ' . ( $row_offset + $num_rows ) . $query;
 138                                 }
 139
 140                                 $this->result = @mssql_query("SELECT $query", $this->db_connect_id);
 141
 142                                 if( $this->result )
 143                                 {
 144                                         $this->limit_offset[$this->result] = ( !empty($row_offset) ) ? $row_offset : 0;
 145
 146                                         if( $row_offset > 0 )
 147                                         {
 148                                                 @mssql_data_seek($this->result, $row_offset);
 149                                         }
 150                                 }
 151                         }
 152                         else if( preg_match('#^INSERT #i', $query) )
 153                         {
 154                                 if( @mssql_query($query, $this->db_connect_id) )
 155                                 {
 156                                         $this->result = time() + microtime();
 157
 158                                         $result_id = @mssql_query('SELECT @@IDENTITY AS id, @@ROWCOUNT as affected', $this->db_connect_id);
 159                                         if( $result_id )
 160                                         {
 161                                                 if( $row = @mssql_fetch_array($result_id) )
 162                                                 {
 163                                                         $this->next_id[$this->db_connect_id] = $row['id'];
 164                                                         $this->affected_rows[$this->db_connect_id] = $row['affected'];
 165                                                 }
 166                                         }
 167                                 }
 168                         }
 169                         else
 170                         {
 171                                 if( @mssql_query($query, $this->db_connect_id) )
 172                                 {
 173                                         $this->result = time() + microtime();
 174
 175                                         $result_id = @mssql_query('SELECT @@ROWCOUNT as affected', $this->db_connect_id);
 176                                         if( $result_id )
 177                                         {
 178                                                 if( $row = @mssql_fetch_array($result_id) )
 179                                                 {
 180                                                         $this->affected_rows[$this->db_connect_id] = $row['affected'];
 181                                                 }
 182                                         }
 183                                 }
 184                         }
 185
 186                         if( !$this->result )
 187                         {
 188                                 if( $this->in_transaction )
 189                                 {
 190                                         @mssql_query('ROLLBACK', $this->db_connect_id);
 191                                         $this->in_transaction = FALSE;
 192                                 }
 193
 194                                 return false;
 195                         }
 196
 197                         if( $transaction == END_TRANSACTION && $this->in_transaction )
 198                         {
 199                                 $this->in_transaction = FALSE;
 200
 201                                 if( !@mssql_query('COMMIT', $this->db_connect_id) )
 202                                 {
 203                                         @mssql_query("ROLLBACK", $this->db_connect_id);
 204                                         return false;
 205                                 }
 206                         }
 207
 208                         return $this->result;
 209                 }
 210                 else
 211                 {
 212                         if( $transaction == END_TRANSACTION && $this->in_transaction  )
 213                         {
 214                                 $this->in_transaction = FALSE;
 215
 216                                 if( !@mssql_query('COMMIT', $this->db_connect_id) )
 217                                 {
 218                                         @mssql_query('ROLLBACK', $this->db_connect_id);
 219                                         return false;
 220                                 }
 221                         }
 222
 223                         return true;
 224                 }
 225         }
 226
 227         //
 228         // Other query methods
 229         //
 230         function sql_numrows($query_id = 0)
 231         {
 232                 if( !$query_id )
 233                 {
 234                         $query_id = $this->result;
 235                 }
 236
 237                 if( $query_id )
 238                 {
 239                         return ( !empty($this->limit_offset[$query_id]) ) ? @mssql_num_rows($query_id) - $this->limit_offset[$query_id] : @mssql_num_rows($query_id);
 240                 }
 241                 else
 242                 {
 243                         return false;
 244                 }
 245         }
 246
 247         function sql_numfields($query_id = 0)
 248         {
 249                 if( !$query_id )
 250                 {
 251                         $query_id = $this->result;
 252                 }
 253
 254                 return ( $query_id ) ? @mssql_num_fields($query_id) : false;
 255         }
 256
 257         function sql_fieldname($offset, $query_id = 0)
 258         {
 259                 if( !$query_id )
 260                 {
 261                         $query_id = $this->result;
 262                 }
 263
 264                 return ( $query_id ) ? @mssql_field_name($query_id, $offset) : false;
 265         }
 266
 267         function sql_fieldtype($offset, $query_id = 0)
 268         {
 269                 if(!$query_id)
 270                 {
 271                         $query_id = $this->result;
 272                 }
 273
 274                 return ( $query_id ) ? @mssql_field_type($query_id, $offset) : false;
 275         }
 276
 277         function sql_fetchrow($query_id = 0)
 278         {
 279                 if( !$query_id )
 280                 {
 281                         $query_id = $this->result;
 282                 }
 283
 284                 if( $query_id )
 285                 {
 286                         empty($row);
 287
 288                         $row = @mssql_fetch_array($query_id);
 289
 290                         while( list($key, $value) = @each($row) )
 291                         {
 292                                 $row[$key] = ($value === ' ') ? '' : stripslashes($value);
 293                         }
 294                         @reset($row);
 295
 296                         return $row;
 297                 }
 298                 else
 299                 {
 300                         return false;
 301                 }
 302         }
 303
 304         function sql_fetchrowset($query_id = 0)
 305         {
 306                 if( !$query_id )
 307                 {
 308                         $query_id = $this->result;
 309                 }
 310
 311                 if( $query_id )
 312                 {
 313                         $i = 0;
 314                         empty($rowset);
 315
 316                         while( $row = @mssql_fetch_array($query_id))
 317                         {
 318                                 while( list($key, $value) = @each($row) )
 319                                 {
 320                                         $rowset[$i][$key] = ($value === ' ') ? '' : stripslashes($value);
 321                                 }
 322                                 $i++;
 323                         }
 324                         @reset($rowset);
 325
 326                         return $rowset;
 327                 }
 328                 else
 329                 {
 330                         return false;
 331                 }
 332         }
 333
 334         function sql_fetchfield($field, $row = -1, $query_id)
 335         {
 336                 if( !$query_id )
 337                 {
 338                         $query_id = $this->result;
 339                 }
 340
 341                 if( $query_id )
 342                 {
 343                         if( $row != -1 )
 344                         {
 345                                 if( $this->limit_offset[$query_id] > 0 )
 346                                 {
 347                                         $result = ( !empty($this->limit_offset[$query_id]) ) ? @mssql_result($this->result, ($this->limit_offset[$query_id] + $row), $field) : false;
 348                                 }
 349                                 else
 350                                 {
 351                                         $result = @mssql_result($this->result, $row, $field);
 352                                 }
 353                         }
 354                         else
 355                         {
 356                                 if( empty($this->row[$query_id]) )
 357                                 {
 358                                         $this->row[$query_id] = @mssql_fetch_array($query_id);
 359                                         $result = ($this->row[$query_id][$field] === ' ') ? '' : stripslashes($this->row[$query_id][$field]);
 360                                 }
 361                         }
 362
 363                         return $result;
 364                 }
 365                 else
 366                 {
 367                         return false;
 368                 }
 369         }
 370
 371         function sql_rowseek($rownum, $query_id = 0)
 372         {
 373                 if( !$query_id )
 374                 {
 375                         $query_id = $this->result;
 376                 }
 377
 378                 if( $query_id )
 379                 {
 380                         return ( !empty($this->limit_offset[$query_id]) ) ? @mssql_data_seek($query_id, ($this->limit_offset[$query_id] + $rownum)) : @mssql_data_seek($query_id, $rownum);
 381                 }
 382                 else
 383                 {
 384                         return false;
 385                 }
 386         }
 387
 388         function sql_nextid()
 389         {
 390                 return ( $this->next_id[$this->db_connect_id] ) ? $this->next_id[$this->db_connect_id] : false;
 391         }
 392
 393         function sql_affectedrows()
 394         {
 395                 return ( $this->affected_rows[$this->db_connect_id] ) ? $this->affected_rows[$this->db_connect_id] : false;
 396         }
 397
 398         function sql_freeresult($query_id = 0)
 399         {
 400                 if( !$query_id )
 401                 {
 402                         $query_id = $this->result;
 403                 }
 404
 405                 return ( $query_id ) ? @mssql_free_result($query_id) : false;
 406         }
 407
 408         function sql_error($query_id = 0)
 409         {
 410                 $result['message'] = @mssql_get_last_message();
 411                 return $result;
 412         }
 413
 414 } // class sql_db
 415
 416 } // if ... define
 417
 418 ?>