includes/DatabasePostgres.php

   1 <?php
   2
   3 /**
   4  * This is PostgreSQL database abstraction layer.
   5  *
   6  * As it includes more generic version for DB functions,
   7  * than MySQL ones, some of them should be moved to parent
   8  * Database class.
   9  *
  10  * @package MediaWiki
  11  */
  12
  13 /**
  14  * Depends on database
  15  */
  16 require_once( 'Database.php' );
  17
  18 class DatabasePostgres extends Database {
  19         var $mInsertId = NULL;
  20         var $mLastResult = NULL;
  21
  22         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  23                 $failFunction = false, $flags = 0 )
  24         {
  25
  26                 global $wgOut, $wgDBprefix, $wgCommandLineMode;
  27                 # Can't get a reference if it hasn't been set yet
  28                 if ( !isset( $wgOut ) ) {
  29                         $wgOut = NULL;
  30                 }
  31                 $this->mOut =& $wgOut;
  32                 $this->mFailFunction = $failFunction;
  33                 $this->mCascadingDeletes = true;
  34                 $this->mCleanupTriggers = true;
  35                 $this->mFlags = $flags;
  36                 $this->open( $server, $user, $password, $dbName);
  37
  38         }
  39
  40         static function newFromParams( $server = false, $user = false, $password = false, $dbName = false,
  41                 $failFunction = false, $flags = 0)
  42         {
  43                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
  44         }
  45
  46         /**
  47          * Usually aborts on failure
  48          * If the failFunction is set to a non-zero integer, returns success
  49          */
  50         function open( $server, $user, $password, $dbName ) {
  51                 # Test for PostgreSQL support, to avoid suppressed fatal error
  52                 if ( !function_exists( 'pg_connect' ) ) {
  53                         throw new DBConnectionError( $this, "PostgreSQL functions missing, have you compiled PHP with the --with-pgsql option?\n" );
  54                 }
  55
  56
  57                 global $wgDBport;
  58
  59                 $this->close();
  60                 $this->mServer = $server;
  61                 $port = $wgDBport;
  62                 $this->mUser = $user;
  63                 $this->mPassword = $password;
  64                 $this->mDBname = $dbName;
  65
  66                 $success = false;
  67                 $hstring="";
  68                 if ($server!=false && $server!="") {
  69                         $hstring="host=$server ";
  70                 }
  71                 if ($port!=false && $port!="") {
  72                         $hstring .= "port=$port ";
  73                 }
  74
  75                 if (!strlen($user)) { ## e.g. the class is being loaded
  76                         return;
  77                 }
  78
  79                 error_reporting( E_ALL );
  80                 @$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
  81
  82                 if ( $this->mConn == false ) {
  83                         wfDebug( "DB connection error\n" );
  84                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
  85                         wfDebug( $this->lastError()."\n" );
  86                         return false;
  87                 }
  88
  89                 $this->mOpened = true;
  90                 ## If this is the initial connection, setup the schema stuff and possibly create the user
  91                 if (defined('MEDIAWIKI_INSTALL')) {
  92                         global $wgDBname, $wgDBuser, $wgDBpass, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
  93                         print "OK</li>\n";
  94
  95                         $safeuser = $this->quote_ident($wgDBuser);
  96                         ## Are we connecting as a superuser for the first time?
  97                         if ($wgDBsuperuser) {
  98                                 ## Are we really a superuser? Check out our rights
  99                                 $SQL = "SELECT
 100                                                 CASE WHEN usesuper IS TRUE THEN
 101                                                         CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 102                                                         ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 103                         END AS rights
 104                                                 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 105                                 $rows = $this->numRows($res = $this->doQuery($SQL));
 106                                 if (!$rows) {
 107                                         print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 108                                         dieout('</ul>');
 109                                 }
 110                                 $perms = pg_fetch_result($res, 0, 0);
 111
 112                                 $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 113                                 $rows = $this->numRows($this->doQuery($SQL));
 114                                 if ($rows) {
 115                                         print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 116                                 }
 117                                 else {
 118                                         if ($perms != 1 and $perms != 3) {
 119                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 120                                                 print 'Please use a different Postgres user.</li>';
 121                                                 dieout('</ul>');
 122                                         }
 123                                         print "<li>Creating user <b>$wgDBuser</b>...";
 124                                         $safepass = $this->addQuotes($wgDBpass);
 125                                         $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 126                                         $this->doQuery($SQL);
 127                                         print "OK</li>\n";
 128                                 }
 129                                 ## User now exists, check out the database
 130                                 if ($dbName != $wgDBname) {
 131                                         $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 132                                         $rows = $this->numRows($this->doQuery($SQL));
 133                                         if ($rows) {
 134                                                 print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 135                                         }
 136                                         else {
 137                                                 if ($perms < 2) {
 138                                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 139                                                         print 'Please use a different Postgres user.</li>';
 140                                                         dieout('</ul>');
 141                                                 }
 142                                                 print "<li>Creating database <b>$wgDBname</b>...";
 143                                                 $safename = $this->quote_ident($wgDBname);
 144                                                 $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 145                                                 $this->doQuery($SQL);
 146                                                 print "OK</li>\n";
 147                                                 ## Hopefully tsearch2 and plpgsql are in template1...
 148                                         }
 149
 150                                         ## Reconnect to check out tsearch2 rights for this user
 151                                         print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 152                                         @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$user password=$password");
 153                                         if ( $this->mConn == false ) {
 154                                                 print "<b>FAILED TO CONNECT!</b></li>";
 155                                                 dieout("</uL>");
 156                                         }
 157                                         print "OK</li>\n";
 158                                 }
 159
 160                                 ## Tsearch2 checks
 161                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 162                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 163                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 164                                         print "Please see 'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 165                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 166                                         dieout("</ul>");
 167                                 }
 168                                 print "OK</li>\n";
 169                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 170                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 171                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 172                                         $this->doQuery($SQL);
 173                                 }
 174                                 print "OK</li>\n";
 175
 176
 177                                 ## Setup the schema for this user if needed
 178                                 $result = $this->schemaExists($wgDBmwschema);
 179                                 if (!$result) {
 180                                         print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 181                                         $safeschema = $this->quote_ident($wgDBmwschema);
 182                                         $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 183                                         if (!$result) {
 184                                                 print "<b>FAILED</b>.</li>\n";
 185                                                 dieout("</ul>");
 186                                         }
 187                                         print "OK</li>\n";
 188                                 }
 189
 190                                 $wgDBsuperuser = '';
 191                                 return true; ## Reconnect as regular user
 192                         }
 193
 194                 if (!defined('POSTGRES_SEARCHPATH')) {
 195
 196                         ## Do we have the basic tsearch2 table?
 197                         print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 198                         if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 199                                 print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 200                                 print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 201                                 print " for instructions.</li>\n";
 202                                 dieout("</ul>");
 203                         }
 204                         print "OK</li>\n";
 205
 206                         ## Does this user have the rights to the tsearch2 tables?
 207                         print "<li>Checking tsearch2 permissions...";
 208                         $SQL = "SELECT 1 FROM $wgDBts2schema.pg_ts_cfg";
 209                         error_reporting( 0 );
 210                         $res = $this->doQuery($SQL);
 211                         error_reporting( E_ALL );
 212                         if (!$res) {
 213                                 print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" has SELECT access to the tsearch2 tables</li>\n";
 214                                 dieout("</uL>");
 215                         }
 216                         print "OK</li>";
 217
 218                         ## Do we have plpgsql installed?
 219                         print "<li>Checking for Pl/Pgsql ...";
 220                         $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 221                         $rows = $this->numRows($this->doQuery($SQL));
 222                         if ($rows < 1) {
 223                                 print "<b>FAILED</b>. Make sure the language plpgsql is installed for the database <tt>$wgDBname</tt></li>";
 224                                 dieout("</ul>");
 225                         }
 226                         print "OK</li>\n";
 227
 228                         ## Does the schema already exist? Who owns it?
 229                         $result = $this->schemaExists($wgDBmwschema);
 230                         if (!$result) {
 231                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 232                                 $result = $this->doQuery("CREATE SCHEMA $wgDBmwschema");
 233                                 if (!$result) {
 234                                         print "<b>FAILED</b>.</li>\n";
 235                                         dieout("</ul>");
 236                                 }
 237                                 print "OK</li>\n";
 238                         }
 239                         else if ($result != $user) {
 240                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$user\". Not ideal.</li>\n";
 241                         }
 242                         else {
 243                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$user\". Excellent.</li>\n";
 244                         }
 245
 246                         ## Fix up the search paths if needed
 247                         print "<li>Setting the search path for user \"$user\" ...";
 248                         $path = $this->quote_ident($wgDBmwschema);
 249                         if ($wgDBts2schema !== $wgDBmwschema)
 250                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 251                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 252                                 $path .= ", public";
 253                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 254                         $result = pg_query($this->mConn, $SQL);
 255                         if (!$result) {
 256                                 print "<b>FAILED</b>.</li>\n";
 257                                 dieout("</ul>");
 258                         }
 259                         print "OK</li>\n";
 260                         ## Set for the rest of this session
 261                         $SQL = "SET search_path = $path";
 262                         $result = pg_query($this->mConn, $SQL);
 263                         if (!$result) {
 264                                 print "<li>Failed to set search_path</li>\n";
 265                                 dieout("</ul>");
 266                         }
 267                         define( "POSTGRES_SEARCHPATH", $path );
 268                 }}
 269
 270                 return $this->mConn;
 271         }
 272
 273         /**
 274          * Closes a database connection, if it is open
 275          * Returns success, true if already closed
 276          */
 277         function close() {
 278                 $this->mOpened = false;
 279                 if ( $this->mConn ) {
 280                         return pg_close( $this->mConn );
 281                 } else {
 282                         return true;
 283                 }
 284         }
 285
 286         function doQuery( $sql ) {
 287                 return $this->mLastResult=pg_query( $this->mConn , $sql);
 288         }
 289
 290         function queryIgnore( $sql, $fname = '' ) {
 291                 return $this->query( $sql, $fname, true );
 292         }
 293
 294         function freeResult( $res ) {
 295                 if ( !@pg_free_result( $res ) ) {
 296                         throw new DBUnexpectedError($this,  "Unable to free PostgreSQL result\n" );
 297                 }
 298         }
 299
 300         function fetchObject( $res ) {
 301                 @$row = pg_fetch_object( $res );
 302                 # FIXME: HACK HACK HACK HACK debug
 303
 304                 # TODO:
 305                 # hashar : not sure if the following test really trigger if the object
 306                 #          fetching failled.
 307                 if( pg_last_error($this->mConn) ) {
 308                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 309                 }
 310                 return $row;
 311         }
 312
 313         function fetchRow( $res ) {
 314                 @$row = pg_fetch_array( $res );
 315                 if( pg_last_error($this->mConn) ) {
 316                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 317                 }
 318                 return $row;
 319         }
 320
 321         function numRows( $res ) {
 322                 @$n = pg_num_rows( $res );
 323                 if( pg_last_error($this->mConn) ) {
 324                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 325                 }
 326                 return $n;
 327         }
 328         function numFields( $res ) { return pg_num_fields( $res ); }
 329         function fieldName( $res, $n ) { return pg_field_name( $res, $n ); }
 330
 331         /**
 332          * This must be called after nextSequenceVal
 333          */
 334         function insertId() {
 335                 return $this->mInsertId;
 336         }
 337
 338         function dataSeek( $res, $row ) { return pg_result_seek( $res, $row ); }
 339         function lastError() {
 340                 if ( $this->mConn ) {
 341                         return pg_last_error();
 342                 }
 343                 else {
 344                         return "No database connection";
 345                 }
 346         }
 347         function lastErrno() {
 348                 return pg_last_error() ? 1 : 0;
 349         }
 350
 351         function affectedRows() {
 352                 return pg_affected_rows( $this->mLastResult );
 353         }
 354
 355         /**
 356          * Returns information about an index
 357          * If errors are explicitly ignored, returns NULL on failure
 358          */
 359         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 360                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 361                 $res = $this->query( $sql, $fname );
 362                 if ( !$res ) {
 363                         return NULL;
 364                 }
 365
 366                 while ( $row = $this->fetchObject( $res ) ) {
 367                         if ( $row->indexname == $index ) {
 368                                 return $row;
 369                         }
 370                 }
 371                 return false;
 372         }
 373
 374         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 375                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 376                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 377                 $res = $this->query( $sql, $fname );
 378                 if ( !$res )
 379                         return NULL;
 380                 while ($row = $this->fetchObject( $res ))
 381                         return true;
 382                 return false;
 383
 384         }
 385
 386         function insert( $table, $a, $fname = 'Database::insert', $options = array() ) {
 387                 # PostgreSQL doesn't support options
 388                 # We have a go at faking one of them
 389                 # TODO: DELAYED, LOW_PRIORITY
 390
 391                 if ( !is_array($options))
 392                         $options = array($options);
 393
 394                 if ( in_array( 'IGNORE', $options ) )
 395                         $oldIgnore = $this->ignoreErrors( true );
 396
 397                 # IGNORE is performed using single-row inserts, ignoring errors in each
 398                 # FIXME: need some way to distiguish between key collision and other types of error
 399                 $oldIgnore = $this->ignoreErrors( true );
 400                 if ( !is_array( reset( $a ) ) ) {
 401                         $a = array( $a );
 402                 }
 403                 foreach ( $a as $row ) {
 404                         parent::insert( $table, $row, $fname, array() );
 405                 }
 406                 $this->ignoreErrors( $oldIgnore );
 407                 $retVal = true;
 408
 409                 if ( in_array( 'IGNORE', $options ) )
 410                         $this->ignoreErrors( $oldIgnore );
 411
 412                 return $retVal;
 413         }
 414
 415         function tableName( $name ) {
 416                 # Replace reserved words with better ones
 417                 switch( $name ) {
 418                         case 'user':
 419                                 return 'mwuser';
 420                         case 'text':
 421                                 return 'pagecontent';
 422                         default:
 423                                 return $name;
 424                 }
 425         }
 426
 427         /**
 428          * Return the next in a sequence, save the value for retrieval via insertId()
 429          */
 430         function nextSequenceValue( $seqName ) {
 431                 $safeseq = preg_replace( "/'/", "''", $seqName );
 432                 $res = $this->query( "SELECT nextval('$safeseq')" );
 433                 $row = $this->fetchRow( $res );
 434                 $this->mInsertId = $row[0];
 435                 $this->freeResult( $res );
 436                 return $this->mInsertId;
 437         }
 438
 439         /**
 440          * USE INDEX clause
 441          * PostgreSQL doesn't have them and returns ""
 442          */
 443         function useIndexClause( $index ) {
 444                 return '';
 445         }
 446
 447         # REPLACE query wrapper
 448         # PostgreSQL simulates this with a DELETE followed by INSERT
 449         # $row is the row to insert, an associative array
 450         # $uniqueIndexes is an array of indexes. Each element may be either a
 451         # field name or an array of field names
 452         #
 453         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 454         # However if you do this, you run the risk of encountering errors which wouldn't have
 455         # occurred in MySQL
 456         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 457                 $table = $this->tableName( $table );
 458
 459                 if (count($rows)==0) {
 460                         return;
 461                 }
 462
 463                 # Single row case
 464                 if ( !is_array( reset( $rows ) ) ) {
 465                         $rows = array( $rows );
 466                 }
 467
 468                 foreach( $rows as $row ) {
 469                         # Delete rows which collide
 470                         if ( $uniqueIndexes ) {
 471                                 $sql = "DELETE FROM $table WHERE ";
 472                                 $first = true;
 473                                 foreach ( $uniqueIndexes as $index ) {
 474                                         if ( $first ) {
 475                                                 $first = false;
 476                                                 $sql .= "(";
 477                                         } else {
 478                                                 $sql .= ') OR (';
 479                                         }
 480                                         if ( is_array( $index ) ) {
 481                                                 $first2 = true;
 482                                                 foreach ( $index as $col ) {
 483                                                         if ( $first2 ) {
 484                                                                 $first2 = false;
 485                                                         } else {
 486                                                                 $sql .= ' AND ';
 487                                                         }
 488                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 489                                                 }
 490                                         } else {
 491                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 492                                         }
 493                                 }
 494                                 $sql .= ')';
 495                                 $this->query( $sql, $fname );
 496                         }
 497
 498                         # Now insert the row
 499                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 500                                 $this->makeList( $row, LIST_COMMA ) . ')';
 501                         $this->query( $sql, $fname );
 502                 }
 503         }
 504
 505         # DELETE where the condition is a join
 506         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 507                 if ( !$conds ) {
 508                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 509                 }
 510
 511                 $delTable = $this->tableName( $delTable );
 512                 $joinTable = $this->tableName( $joinTable );
 513                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 514                 if ( $conds != '*' ) {
 515                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 516                 }
 517                 $sql .= ')';
 518
 519                 $this->query( $sql, $fname );
 520         }
 521
 522         # Returns the size of a text field, or -1 for "unlimited"
 523         function textFieldSize( $table, $field ) {
 524                 $table = $this->tableName( $table );
 525                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 526                         FROM pg_class c, pg_attribute a, pg_type t
 527                         WHERE relname='$table' AND a.attrelid=c.oid AND
 528                                 a.atttypid=t.oid and a.attname='$field'";
 529                 $res =$this->query($sql);
 530                 $row=$this->fetchObject($res);
 531                 if ($row->ftype=="varchar") {
 532                         $size=$row->size-4;
 533                 } else {
 534                         $size=$row->size;
 535                 }
 536                 $this->freeResult( $res );
 537                 return $size;
 538         }
 539
 540         function lowPriorityOption() {
 541                 return '';
 542         }
 543
 544         function limitResult($sql, $limit,$offset) {
 545                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 546         }
 547
 548         /**
 549          * Returns an SQL expression for a simple conditional.
 550          * Uses CASE on PostgreSQL.
 551          *
 552          * @param string $cond SQL expression which will result in a boolean value
 553          * @param string $trueVal SQL expression to return if true
 554          * @param string $falseVal SQL expression to return if false
 555          * @return string SQL fragment
 556          */
 557         function conditional( $cond, $trueVal, $falseVal ) {
 558                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
 559         }
 560
 561         # FIXME: actually detecting deadlocks might be nice
 562         function wasDeadlock() {
 563                 return false;
 564         }
 565
 566         function timestamp( $ts=0 ) {
 567                 return wfTimestamp(TS_POSTGRES,$ts);
 568         }
 569
 570         /**
 571          * Return aggregated value function call
 572          */
 573         function aggregateValue ($valuedata,$valuename='value') {
 574                 return $valuedata;
 575         }
 576
 577
 578         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 579                 $message = "A database error has occurred\n" .
 580                         "Query: $sql\n" .
 581                         "Function: $fname\n" .
 582                         "Error: $errno $error\n";
 583                 throw new DBUnexpectedError($this, $message);
 584         }
 585
 586         /**
 587          * @return string wikitext of a link to the server software's web site
 588          */
 589         function getSoftwareLink() {
 590                 return "[http://www.postgresql.org/ PostgreSQL]";
 591         }
 592
 593         /**
 594          * @return string Version information from the database
 595          */
 596         function getServerVersion() {
 597                 $res = $this->query( "SELECT version()" );
 598                 $row = $this->fetchRow( $res );
 599                 $version = $row[0];
 600                 $this->freeResult( $res );
 601                 return $version;
 602         }
 603
 604
 605         /**
 606          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 607          */
 608         function tableExists( $table, $schema = false ) {
 609                 global $wgDBmwschema;
 610                 if (! $schema )
 611                         $schema = $wgDBmwschema;
 612                 $etable = preg_replace("/'/", "''", $table);
 613                 $eschema = preg_replace("/'/", "''", $schema);
 614                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
 615                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema'";
 616                 $res = $this->query( $SQL );
 617                 $count = $res ? pg_num_rows($res) : 0;
 618                 if ($res)
 619                         $this->freeResult( $res );
 620                 return $count;
 621         }
 622
 623
 624         /**
 625          * Query whether a given schema exists. Returns the name of the owner
 626          */
 627         function schemaExists( $schema ) {
 628                 $eschema = preg_replace("/'/", "''", $schema);
 629                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
 630                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
 631                 $res = $this->query( $SQL );
 632                 $owner = $res ? pg_num_rows($res) ? pg_fetch_result($res, 0, 0) : false : false;
 633                 if ($res)
 634                         $this->freeResult($res);
 635                 return $owner;
 636         }
 637
 638         /**
 639          * Query whether a given column exists in the mediawiki schema
 640          */
 641         function fieldExists( $table, $field ) {
 642                 global $wgDBmwschema;
 643                 $etable = preg_replace("/'/", "''", $table);
 644                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
 645                 $ecol = preg_replace("/'/", "''", $field);
 646                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
 647                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
 648                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
 649                 $res = $this->query( $SQL );
 650                 $count = $res ? pg_num_rows($res) : 0;
 651                 if ($res)
 652                         $this->freeResult( $res );
 653                 return $count;
 654         }
 655
 656         function fieldInfo( $table, $field ) {
 657                 $res = $this->query( "SELECT $field FROM $table LIMIT 1" );
 658                 $type = pg_field_type( $res, 0 );
 659                 return $type;
 660         }
 661
 662         function begin( $fname = 'DatabasePostgrs::begin' ) {
 663                 $this->query( 'BEGIN', $fname );
 664                 $this->mTrxLevel = 1;
 665         }
 666         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
 667                 return true;
 668         }
 669         function commit( $fname = 'DatabasePostgres::commit' ) {
 670                 $this->query( 'COMMIT', $fname );
 671                 $this->mTrxLevel = 0;
 672         }
 673
 674         /* Not even sure why this is used in the main codebase... */
 675         function limitResultForUpdate($sql, $num) {
 676                 return $sql;
 677         }
 678
 679         function setup_database() {
 680                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport;
 681
 682                 dbsource( "../maintenance/postgres/tables.sql", $this);
 683
 684                 ## Update version information
 685                 $mwv = $this->addQuotes($wgVersion);
 686                 $pgv = $this->addQuotes($this->getServerVersion());
 687                 $pgu = $this->addQuotes($this->mUser);
 688                 $mws = $this->addQuotes($wgDBmwschema);
 689                 $tss = $this->addQuotes($wgDBts2schema);
 690                 $pgp = $this->addQuotes($wgDBport);
 691                 $dbn = $this->addQuotes($this->mDBname);
 692
 693                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
 694                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn ".
 695                                 "WHERE type = 'Creation'";
 696                 $this->query($SQL);
 697
 698                 ## Avoid the non-standard "REPLACE INTO" syntax
 699                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
 700                 if ($f == false ) {
 701                         dieout( "<li>Could not find the interwiki.sql file");
 702                 }
 703                 ## We simply assume it is already empty as we have just created it
 704                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
 705                 while ( ! feof( $f ) ) {
 706                         $line = fgets($f,1024);
 707                         if (!preg_match("/^\s*(\(.+?),(\d)\)/", $line, $matches)) {
 708                                 continue;
 709                         }
 710                         $yesno = $matches[2]; ## ? "'true'" : "'false'";
 711                         $this->query("$SQL $matches[1],$matches[2])");
 712                 }
 713                 print " (table interwiki successfully populated)...\n";
 714         }
 715
 716         function encodeBlob($b) {
 717                 return array('bytea',pg_escape_bytea($b));
 718         }
 719         function decodeBlob($b) {
 720                 return pg_unescape_bytea( $b );
 721         }
 722
 723         function strencode( $s ) { ## Should not be called by us
 724                 return pg_escape_string( $s );
 725         }
 726
 727         function addQuotes( $s ) {
 728                 if ( is_null( $s ) ) {
 729                         return 'NULL';
 730                 } else if (is_array( $s )) { ## Assume it is bytea data
 731                         return "E'$s[1]'";
 732                 }
 733                 return "'" . pg_escape_string($s) . "'";
 734                 return "E'" . pg_escape_string($s) . "'";
 735         }
 736
 737         function quote_ident( $s ) {
 738                 return '"' . preg_replace( '/"/', '""', $s) . '"';
 739         }
 740
 741 }
 742
 743 ?>