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