includes/db/DatabasePostgres.php

   1 <?php
   2 /**
   3  * This is the Postgres database abstraction layer.
   4  *
   5  * @file
   6  * @ingroup Database
   7  */
   8
   9 class PostgresField {
  10         private $name, $tablename, $type, $nullable, $max_length, $deferred, $deferrable, $conname;
  11
  12         static function fromText($db, $table, $field) {
  13         global $wgDBmwschema;
  14
  15                 $q = <<<SQL
  16 SELECT
  17  attnotnull, attlen, COALESCE(conname, '') AS conname,
  18  COALESCE(condeferred, 'f') AS deferred,
  19  COALESCE(condeferrable, 'f') AS deferrable,
  20  CASE WHEN typname = 'int2' THEN 'smallint'
  21   WHEN typname = 'int4' THEN 'integer'
  22   WHEN typname = 'int8' THEN 'bigint'
  23   WHEN typname = 'bpchar' THEN 'char'
  24  ELSE typname END AS typname
  25 FROM pg_class c
  26 JOIN pg_namespace n ON (n.oid = c.relnamespace)
  27 JOIN pg_attribute a ON (a.attrelid = c.oid)
  28 JOIN pg_type t ON (t.oid = a.atttypid)
  29 LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
  30 WHERE relkind = 'r'
  31 AND nspname=%s
  32 AND relname=%s
  33 AND attname=%s;
  34 SQL;
  35
  36                 $table = $db->tableName( $table );
  37                 $res = $db->query(sprintf($q,
  38                                 $db->addQuotes($wgDBmwschema),
  39                                 $db->addQuotes($table),
  40                                 $db->addQuotes($field)));
  41                 $row = $db->fetchObject($res);
  42                 if (!$row)
  43                         return null;
  44                 $n = new PostgresField;
  45                 $n->type = $row->typname;
  46                 $n->nullable = ($row->attnotnull == 'f');
  47                 $n->name = $field;
  48                 $n->tablename = $table;
  49                 $n->max_length = $row->attlen;
  50                 $n->deferrable = ($row->deferrable == 't');
  51                 $n->deferred = ($row->deferred == 't');
  52                 $n->conname = $row->conname;
  53                 return $n;
  54         }
  55
  56         function name() {
  57                 return $this->name;
  58         }
  59
  60         function tableName() {
  61                 return $this->tablename;
  62         }
  63
  64         function type() {
  65                 return $this->type;
  66         }
  67
  68         function nullable() {
  69                 return $this->nullable;
  70         }
  71
  72         function maxLength() {
  73                 return $this->max_length;
  74         }
  75
  76         function is_deferrable() {
  77                 return $this->deferrable;
  78         }
  79
  80         function is_deferred() {
  81                 return $this->deferred;
  82         }
  83
  84         function conname() {
  85                 return $this->conname;
  86         }
  87
  88 }
  89
  90 /**
  91  * @ingroup Database
  92  */
  93 class DatabasePostgres extends DatabaseBase {
  94         var $mInsertId = null;
  95         var $mLastResult = null;
  96         var $numeric_version = null;
  97         var $mAffectedRows = null;
  98
  99         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
 100                 $flags = 0 )
 101         {
 102                 $this->mFlags = $flags;
 103                 $this->open( $server, $user, $password, $dbName);
 104         }
 105
 106         function getType() {
 107                 return 'postgres';
 108         }
 109
 110         function cascadingDeletes() {
 111                 return true;
 112         }
 113         function cleanupTriggers() {
 114                 return true;
 115         }
 116         function strictIPs() {
 117                 return true;
 118         }
 119         function realTimestamps() {
 120                 return true;
 121         }
 122         function implicitGroupby() {
 123                 return false;
 124         }
 125         function implicitOrderby() {
 126                 return false;
 127         }
 128         function searchableIPs() {
 129                 return true;
 130         }
 131         function functionalIndexes() {
 132                 return true;
 133         }
 134
 135         function hasConstraint( $name ) {
 136                 global $wgDBmwschema;
 137                 $SQL = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n WHERE c.connamespace = n.oid AND conname = '" . pg_escape_string( $name ) . "' AND n.nspname = '" . pg_escape_string($wgDBmwschema) ."'";
 138                 return $this->numRows($res = $this->doQuery($SQL));
 139         }
 140
 141         static function newFromParams( $server, $user, $password, $dbName, $flags = 0) {
 142                 return new DatabasePostgres( $server, $user, $password, $dbName, $flags );
 143         }
 144
 145         /**
 146          * Usually aborts on failure
 147          */
 148         function open( $server, $user, $password, $dbName ) {
 149                 # Test for Postgres support, to avoid suppressed fatal error
 150                 if ( !function_exists( 'pg_connect' ) ) {
 151                         throw new DBConnectionError( $this, "Postgres functions missing, have you compiled PHP with the --with-pgsql option?\n (Note: if you recently installed PHP, you may need to restart your webserver and database)\n" );
 152                 }
 153
 154                 global $wgDBport;
 155
 156                 if (!strlen($user)) { ## e.g. the class is being loaded
 157                         return;
 158                 }
 159                 $this->close();
 160                 $this->mServer = $server;
 161                 $this->mPort = $port = $wgDBport;
 162                 $this->mUser = $user;
 163                 $this->mPassword = $password;
 164                 $this->mDBname = $dbName;
 165
 166                 $connectVars = array(
 167                         'dbname' => $dbName,
 168                         'user' => $user,
 169                         'password' => $password );
 170                 if ($server!=false && $server!="") {
 171                         $connectVars['host'] = $server;
 172                 }
 173                 if ($port!=false && $port!="") {
 174                         $connectVars['port'] = $port;
 175                 }
 176                 $connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
 177
 178                 $this->installErrorHandler();
 179                 $this->mConn = pg_connect( $connectString );
 180                 $phpError = $this->restoreErrorHandler();
 181
 182                 if ( !$this->mConn ) {
 183                         wfDebug( "DB connection error\n" );
 184                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 185                         wfDebug( $this->lastError()."\n" );
 186                         return false;
 187                 }
 188
 189                 $this->mOpened = true;
 190
 191                 global $wgCommandLineMode;
 192                 ## If called from the command-line (e.g. importDump), only show errors
 193                 if ($wgCommandLineMode) {
 194                         $this->doQuery( "SET client_min_messages = 'ERROR'" );
 195                 }
 196
 197                 $this->doQuery( "SET client_encoding='UTF8'" );
 198
 199                 global $wgDBmwschema, $wgDBts2schema;
 200                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 201                         && $wgDBmwschema !== 'mediawiki'
 202                         && preg_match( '/^\w+$/', $wgDBmwschema )
 203                         && preg_match( '/^\w+$/', $wgDBts2schema )
 204                 ) {
 205                         $safeschema = $this->quote_ident($wgDBmwschema);
 206                         $safeschema2 = $this->quote_ident($wgDBts2schema);
 207                         $this->doQuery( "SET search_path = $safeschema, $wgDBts2schema, public" );
 208                 }
 209
 210                 return $this->mConn;
 211         }
 212
 213         function makeConnectionString( $vars ) {
 214                 $s = '';
 215                 foreach ( $vars as $name => $value ) {
 216                         $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
 217                 }
 218                 return $s;
 219         }
 220
 221
 222         function initial_setup($superuser, $password, $dbName) {
 223                 // If this is the initial connection, setup the schema stuff and possibly create the user
 224                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBmwschema, $wgDBts2schema;
 225
 226                 print "<li>Checking the version of Postgres...";
 227                 $version = $this->getServerVersion();
 228                 $PGMINVER = '8.1';
 229                 if ($version < $PGMINVER) {
 230                         print "<b>FAILED</b>. Required version is $PGMINVER. You have " . htmlspecialchars( $version ) . "</li>\n";
 231                         dieout("</ul>");
 232                 }
 233                 print "version " . htmlspecialchars( $this->numeric_version ) . " is OK.</li>\n";
 234
 235                 $safeuser = $this->quote_ident($wgDBuser);
 236                 // Are we connecting as a superuser for the first time?
 237                 if ($superuser) {
 238                         // Are we really a superuser? Check out our rights
 239                         $SQL = "SELECT
 240                       CASE WHEN usesuper IS TRUE THEN
 241                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 242                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 243                     END AS rights
 244                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($superuser);
 245                         $rows = $this->numRows($res = $this->doQuery($SQL));
 246                         if (!$rows) {
 247                                 print "<li>ERROR: Could not read permissions for user \"" . htmlspecialchars( $superuser ) . "\"</li>\n";
 248                                 dieout('</ul>');
 249                         }
 250                         $perms = pg_fetch_result($res, 0, 0);
 251
 252                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 253                         $rows = $this->numRows($this->doQuery($SQL));
 254                         if ($rows) {
 255                                 print "<li>User \"" . htmlspecialchars( $wgDBuser ) . "\" already exists, skipping account creation.</li>";
 256                         }
 257                         else {
 258                                 if ($perms != 1 and $perms != 3) {
 259                                         print "<li>ERROR: the user \"" . htmlspecialchars( $superuser ) . "\" cannot create other users. ";
 260                                         print 'Please use a different Postgres user.</li>';
 261                                         dieout('</ul>');
 262                                 }
 263                                 print "<li>Creating user <b>" . htmlspecialchars( $wgDBuser ) . "</b>...";
 264                                 $safepass = $this->addQuotes($wgDBpassword);
 265                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 266                                 $this->doQuery($SQL);
 267                                 print "OK</li>\n";
 268                         }
 269                         // User now exists, check out the database
 270                         if ($dbName != $wgDBname) {
 271                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 272                                 $rows = $this->numRows($this->doQuery($SQL));
 273                                 if ($rows) {
 274                                         print "<li>Database \"" . htmlspecialchars( $wgDBname ) . "\" already exists, skipping database creation.</li>";
 275                                 }
 276                                 else {
 277                                         if ($perms < 1) {
 278                                                 print "<li>ERROR: the user \"" . htmlspecialchars( $superuser ) . "\" cannot create databases. ";
 279                                                 print 'Please use a different Postgres user.</li>';
 280                                                 dieout('</ul>');
 281                                         }
 282                                         print "<li>Creating database <b>" . htmlspecialchars( $wgDBname ) . "</b>...";
 283                                         $safename = $this->quote_ident($wgDBname);
 284                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 285                                         $this->doQuery($SQL);
 286                                         print "OK</li>\n";
 287                                         // Hopefully tsearch2 and plpgsql are in template1...
 288                                 }
 289
 290                                 // Reconnect to check out tsearch2 rights for this user
 291                                 print "<li>Connecting to \"" . htmlspecialchars( $wgDBname ) . "\" as superuser \"" .
 292                                         htmlspecialchars( $superuser ) . "\" to check rights...";
 293
 294                                 $connectVars = array();
 295                                 if ($this->mServer!=false && $this->mServer!="") {
 296                                         $connectVars['host'] = $this->mServer;
 297                                 }
 298                                 if ($this->mPort!=false && $this->mPort!="") {
 299                                         $connectVars['port'] = $this->mPort;
 300                                 }
 301                                 $connectVars['dbname'] = $wgDBname;
 302                                 $connectVars['user'] = $superuser;
 303                                 $connectVars['password'] = $password;
 304
 305                                 @$this->mConn = pg_connect( $this->makeConnectionString( $connectVars ) );
 306                                 if ( !$this->mConn ) {
 307                                         print "<b>FAILED TO CONNECT!</b></li>";
 308                                         dieout("</ul>");
 309                                 }
 310                                 print "OK</li>\n";
 311                         }
 312
 313                         if ($this->numeric_version < 8.3) {
 314                                 // Tsearch2 checks
 315                                 print "<li>Checking that tsearch2 is installed in the database \"" .
 316                                         htmlspecialchars( $wgDBname ) . "\"...";
 317                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 318                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"" .
 319                                                 htmlspecialchars( $wgDBname ) . "\".";
 320                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 321                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 322                                         dieout("</ul>");
 323                                 }
 324                                 print "OK</li>\n";
 325                                 print "<li>Ensuring that user \"" . htmlspecialchars( $wgDBuser ) .
 326                                         "\" has select rights on the tsearch2 tables...";
 327                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 328                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 329                                         $this->doQuery($SQL);
 330                                 }
 331                                 print "OK</li>\n";
 332                         }
 333
 334                         // Setup the schema for this user if needed
 335                         $result = $this->schemaExists($wgDBmwschema);
 336                         $safeschema = $this->quote_ident($wgDBmwschema);
 337                         if (!$result) {
 338                                 print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
 339                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 340                                 if (!$result) {
 341                                         print "<b>FAILED</b>.</li>\n";
 342                                         dieout("</ul>");
 343                                 }
 344                                 print "OK</li>\n";
 345                         }
 346                         else {
 347                                 print "<li>Schema already exists, explicitly granting rights...\n";
 348                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 349                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 350                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 351                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 352                                         "AND p.relkind IN ('r','S','v')\n";
 353                                 $SQL .= "UNION\n";
 354                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 355                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 356                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 357                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 358                                 $res = $this->doQuery($SQL);
 359                                 if (!$res) {
 360                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 361                                         dieout("</ul>");
 362                                 }
 363                                 $this->doQuery("SET search_path = $safeschema");
 364                                 $rows = $this->numRows($res);
 365                                 while ($rows) {
 366                                         $rows--;
 367                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 368                                 }
 369                                 print "OK</li>";
 370                         }
 371
 372                         // Install plpgsql if needed
 373                         $this->setup_plpgsql();
 374
 375                         $superuser = '';
 376                         return true; // Reconnect as regular user
 377
 378                 } // end superuser
 379
 380                 if (!defined('POSTGRES_SEARCHPATH')) {
 381
 382                         if ($this->numeric_version < 8.3) {
 383                                 // Do we have the basic tsearch2 table?
 384                                 print "<li>Checking for tsearch2 in the schema \"" . htmlspecialchars( $wgDBts2schema ) . "\"...";
 385                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 386                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 387                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 388                                         print " for instructions.</li>\n";
 389                                         dieout("</ul>");
 390                                 }
 391                                 print "OK</li>\n";
 392
 393                                 // Does this user have the rights to the tsearch2 tables?
 394                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 395                                 print "<li>Checking tsearch2 permissions...";
 396                                 // Let's check all four, just to be safe
 397                                 error_reporting( 0 );
 398                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 399                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 400                                 foreach ( $ts2tables AS $tname ) {
 401                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 402                                         $res = $this->doQuery($SQL);
 403                                         if (!$res) {
 404                                                 print "<b>FAILED</b> to access " . htmlspecialchars( "pg_ts_$tname" ) .
 405                                                         ". Make sure that the user \"". htmlspecialchars( $wgDBuser ) .
 406                                                         "\" has SELECT access to all four tsearch2 tables</li>\n";
 407                                                 dieout("</ul>");
 408                                         }
 409                                 }
 410                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = " . $this->addQuotes( $ctype ) ;
 411                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 412                                 $res = $this->doQuery($SQL);
 413                                 error_reporting( E_ALL );
 414                                 if (!$res) {
 415                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 416                                         dieout("</ul>");
 417                                 }
 418                                 print "OK</li>";
 419
 420                                 // Will the current locale work? Can we force it to?
 421                                 print "<li>Verifying tsearch2 locale with " . htmlspecialchars( $ctype ) . "...";
 422                                 $rows = $this->numRows($res);
 423                                 $resetlocale = 0;
 424                                 if (!$rows) {
 425                                         print "<b>not found</b></li>\n";
 426                                         print "<li>Attempting to set default tsearch2 locale to \"" . htmlspecialchars( $ctype ) . "\"...";
 427                                         $resetlocale = 1;
 428                                 }
 429                                 else {
 430                                         $tsname = pg_fetch_result($res, 0, 0);
 431                                         if ($tsname != 'default') {
 432                                                 print "<b>not set to default (" . htmlspecialchars( $tsname ) . ")</b>";
 433                                                 print "<li>Attempting to change tsearch2 default locale to \"" .
 434                                                         htmlspecialchars( $ctype ) . "\"...";
 435                                                 $resetlocale = 1;
 436                                         }
 437                                 }
 438                                 if ($resetlocale) {
 439                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = " . $this->addQuotes( $ctype ) . " WHERE ts_name = 'default'";
 440                                         $res = $this->doQuery($SQL);
 441                                         if (!$res) {
 442                                                 print "<b>FAILED</b>. ";
 443                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"" .
 444                                                         htmlspecialchars( $ctype ) . "\"</li>\n";
 445                                                 dieout("</ul>");
 446                                         }
 447                                         print "OK</li>";
 448                                 }
 449
 450                                 // Final test: try out a simple tsearch2 query
 451                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 452                                 $res = $this->doQuery($SQL);
 453                                 if (!$res) {
 454                                         print "<b>FAILED</b>. Specifically, \"" . htmlspecialchars( $SQL ) . "\" did not work.</li>";
 455                                         dieout("</ul>");
 456                                 }
 457                                 print "OK</li>";
 458                         }
 459
 460                         // Install plpgsql if needed
 461                         $this->setup_plpgsql();
 462
 463                         // Does the schema already exist? Who owns it?
 464                         $result = $this->schemaExists($wgDBmwschema);
 465                         if (!$result) {
 466                                 print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
 467                                 error_reporting( 0 );
 468                                 $safeschema = $this->quote_ident($wgDBmwschema);
 469                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 470                                 error_reporting( E_ALL );
 471                                 if (!$result) {
 472                                         print "<b>FAILED</b>. The user \"" . htmlspecialchars( $wgDBuser ) .
 473                                                 "\" must be able to access the schema. ".
 474                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 475                                                 "different user, and then grant access to the \"" .
 476                                                 htmlspecialchars( $wgDBuser ) . "\" user.</li>\n";
 477                                         dieout("</ul>");
 478                                 }
 479                                 print "OK</li>\n";
 480                         }
 481                         else if ($result != $wgDBuser) {
 482                                 print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists but is not owned by \"" .
 483                                         htmlspecialchars( $wgDBuser ) . "\". Not ideal.</li>\n";
 484                         }
 485                         else {
 486                                 print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists and is owned by \"" .
 487                                         htmlspecialchars( $wgDBuser ) . "\". Excellent.</li>\n";
 488                         }
 489
 490                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 491                         print "<li>Setting the timezone to GMT for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 492                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 493                         $result = pg_query($this->mConn, $SQL);
 494                         if (!$result) {
 495                                 print "<b>FAILED</b>.</li>\n";
 496                                 dieout("</ul>");
 497                         }
 498                         print "OK</li>\n";
 499                         // Set for the rest of this session
 500                         $SQL = "SET timezone = 'GMT'";
 501                         $result = pg_query($this->mConn, $SQL);
 502                         if (!$result) {
 503                                 print "<li>Failed to set timezone</li>\n";
 504                                 dieout("</ul>");
 505                         }
 506
 507                         print "<li>Setting the datestyle to ISO, YMD for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 508                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 509                         $result = pg_query($this->mConn, $SQL);
 510                         if (!$result) {
 511                                 print "<b>FAILED</b>.</li>\n";
 512                                 dieout("</ul>");
 513                         }
 514                         print "OK</li>\n";
 515                         // Set for the rest of this session
 516                         $SQL = "SET datestyle = 'ISO, YMD'";
 517                         $result = pg_query($this->mConn, $SQL);
 518                         if (!$result) {
 519                                 print "<li>Failed to set datestyle</li>\n";
 520                                 dieout("</ul>");
 521                         }
 522
 523                         // Fix up the search paths if needed
 524                         print "<li>Setting the search path for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 525                         $path = $this->quote_ident($wgDBmwschema);
 526                         if ($wgDBts2schema !== $wgDBmwschema)
 527                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 528                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 529                                 $path .= ", public";
 530                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 531                         $result = pg_query($this->mConn, $SQL);
 532                         if (!$result) {
 533                                 print "<b>FAILED</b>.</li>\n";
 534                                 dieout("</ul>");
 535                         }
 536                         print "OK</li>\n";
 537                         // Set for the rest of this session
 538                         $SQL = "SET search_path = $path";
 539                         $result = pg_query($this->mConn, $SQL);
 540                         if (!$result) {
 541                                 print "<li>Failed to set search_path</li>\n";
 542                                 dieout("</ul>");
 543                         }
 544                         define( "POSTGRES_SEARCHPATH", $path );
 545                 }
 546         }
 547
 548
 549         function setup_plpgsql() {
 550                 print "<li>Checking for PL/pgSQL ...";
 551                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 552                 $rows = $this->numRows($this->doQuery($SQL));
 553                 if ($rows < 1) {
 554                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 555                         print "not installed. Attempting to install PL/pgSQL ...";
 556                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 557                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 558                         $rows = $this->numRows($this->doQuery($SQL));
 559                         global $wgDBname;
 560                         if ($rows >= 1) {
 561                                 $olde = error_reporting(0);
 562                                 error_reporting($olde - E_WARNING);
 563                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 564                                 error_reporting($olde);
 565                                 if (!$result) {
 566                                         print "<b>FAILED</b>. You need to install the language PL/pgSQL in the database <tt>" .
 567                                                 htmlspecialchars( $wgDBname ) . "</tt></li>";
 568                                         dieout("</ul>");
 569                                 }
 570                         }
 571                         else {
 572                                 print "<b>FAILED</b>. You need to install the language PL/pgSQL in the database <tt>" .
 573                                         htmlspecialchars( $wgDBname ) . "</tt></li>";
 574                                 dieout("</ul>");
 575                         }
 576                 }
 577                 print "OK</li>\n";
 578         }
 579
 580
 581         /**
 582          * Closes a database connection, if it is open
 583          * Returns success, true if already closed
 584          */
 585         function close() {
 586                 $this->mOpened = false;
 587                 if ( $this->mConn ) {
 588                         return pg_close( $this->mConn );
 589                 } else {
 590                         return true;
 591                 }
 592         }
 593
 594         function doQuery( $sql ) {
 595                 if (function_exists('mb_convert_encoding')) {
 596                         $sql = mb_convert_encoding($sql,'UTF-8');
 597                 }
 598                 $this->mLastResult = pg_query( $this->mConn, $sql);
 599                 $this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
 600                 return $this->mLastResult;
 601         }
 602
 603         function queryIgnore( $sql, $fname = '' ) {
 604                 return $this->query( $sql, $fname, true );
 605         }
 606
 607         function freeResult( $res ) {
 608                 if ( $res instanceof ResultWrapper ) {
 609                         $res = $res->result;
 610                 }
 611                 if ( !@pg_free_result( $res ) ) {
 612                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 613                 }
 614         }
 615
 616         function fetchObject( $res ) {
 617                 if ( $res instanceof ResultWrapper ) {
 618                         $res = $res->result;
 619                 }
 620                 @$row = pg_fetch_object( $res );
 621                 # FIXME: HACK HACK HACK HACK debug
 622
 623                 # TODO:
 624                 # hashar : not sure if the following test really trigger if the object
 625                 #          fetching failed.
 626                 if( pg_last_error($this->mConn) ) {
 627                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 628                 }
 629                 return $row;
 630         }
 631
 632         function fetchRow( $res ) {
 633                 if ( $res instanceof ResultWrapper ) {
 634                         $res = $res->result;
 635                 }
 636                 @$row = pg_fetch_array( $res );
 637                 if( pg_last_error($this->mConn) ) {
 638                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 639                 }
 640                 return $row;
 641         }
 642
 643         function numRows( $res ) {
 644                 if ( $res instanceof ResultWrapper ) {
 645                         $res = $res->result;
 646                 }
 647                 @$n = pg_num_rows( $res );
 648                 if( pg_last_error($this->mConn) ) {
 649                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 650                 }
 651                 return $n;
 652         }
 653         function numFields( $res ) {
 654                 if ( $res instanceof ResultWrapper ) {
 655                         $res = $res->result;
 656                 }
 657                 return pg_num_fields( $res );
 658         }
 659         function fieldName( $res, $n ) {
 660                 if ( $res instanceof ResultWrapper ) {
 661                         $res = $res->result;
 662                 }
 663                 return pg_field_name( $res, $n );
 664         }
 665
 666         /**
 667          * This must be called after nextSequenceVal
 668          */
 669         function insertId() {
 670                 return $this->mInsertId;
 671         }
 672
 673         function dataSeek( $res, $row ) {
 674                 if ( $res instanceof ResultWrapper ) {
 675                         $res = $res->result;
 676                 }
 677                 return pg_result_seek( $res, $row );
 678         }
 679
 680         function lastError() {
 681                 if ( $this->mConn ) {
 682                         return pg_last_error();
 683                 }
 684                 else {
 685                         return "No database connection";
 686                 }
 687         }
 688         function lastErrno() {
 689                 return pg_last_error() ? 1 : 0;
 690         }
 691
 692         function affectedRows() {
 693                 if ( !is_null( $this->mAffectedRows ) ) {
 694                         // Forced result for simulated queries
 695                         return $this->mAffectedRows;
 696                 }
 697                 if( empty( $this->mLastResult ) )
 698                         return 0;
 699                 return pg_affected_rows( $this->mLastResult );
 700         }
 701
 702         /**
 703          * Estimate rows in dataset
 704          * Returns estimated count, based on EXPLAIN output
 705          * This is not necessarily an accurate estimate, so use sparingly
 706          * Returns -1 if count cannot be found
 707          * Takes same arguments as Database::select()
 708          */
 709
 710         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
 711                 $options['EXPLAIN'] = true;
 712                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 713                 $rows = -1;
 714                 if ( $res ) {
 715                         $row = $this->fetchRow( $res );
 716                         $count = array();
 717                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 718                                 $rows = $count[1];
 719                         }
 720                 }
 721                 return $rows;
 722         }
 723
 724
 725         /**
 726          * Returns information about an index
 727          * If errors are explicitly ignored, returns NULL on failure
 728          */
 729         function indexInfo( $table, $index, $fname = 'DatabasePostgres::indexInfo' ) {
 730                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 731                 $res = $this->query( $sql, $fname );
 732                 if ( !$res ) {
 733                         return null;
 734                 }
 735                 while ( $row = $this->fetchObject( $res ) ) {
 736                         if ( $row->indexname == $this->indexName( $index ) ) {
 737                                 return $row;
 738                         }
 739                 }
 740                 return false;
 741         }
 742
 743         function indexUnique ($table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
 744                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 745                         " AND indexdef LIKE 'CREATE UNIQUE%(" .
 746                         $this->strencode( $this->indexName( $index ) ) .
 747                         ")'";
 748                 $res = $this->query( $sql, $fname );
 749                 if ( !$res )
 750                         return null;
 751                 while ($row = $this->fetchObject( $res ))
 752                         return true;
 753                 return false;
 754
 755         }
 756
 757         /**
 758          * INSERT wrapper, inserts an array into a table
 759          *
 760          * $args may be a single associative array, or an array of these with numeric keys,
 761          * for multi-row insert (Postgres version 8.2 and above only).
 762          *
 763          * @param $table   String: Name of the table to insert to.
 764          * @param $args    Array: Items to insert into the table.
 765          * @param $fname   String: Name of the function, for profiling
 766          * @param $options String or Array. Valid options: IGNORE
 767          *
 768          * @return bool Success of insert operation. IGNORE always returns true.
 769          */
 770         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 771                 if ( !count( $args ) ) {
 772                         return true;
 773                 }
 774
 775                 $table = $this->tableName( $table );
 776                 if (! isset( $this->numeric_version ) ) {
 777                         $this->getServerVersion();
 778                 }
 779
 780                 if ( !is_array( $options ) )
 781                         $options = array( $options );
 782
 783                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 784                         $multi = true;
 785                         $keys = array_keys( $args[0] );
 786                 }
 787                 else {
 788                         $multi = false;
 789                         $keys = array_keys( $args );
 790                 }
 791
 792                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 793                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 794
 795                 // If we are not in a transaction, we need to be for savepoint trickery
 796                 $didbegin = 0;
 797                 if ( $ignore ) {
 798                         if (! $this->mTrxLevel) {
 799                                 $this->begin();
 800                                 $didbegin = 1;
 801                         }
 802                         $olde = error_reporting( 0 );
 803                         // For future use, we may want to track the number of actual inserts
 804                         // Right now, insert (all writes) simply return true/false
 805                         $numrowsinserted = 0;
 806                 }
 807
 808                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 809
 810                 if ( $multi ) {
 811                         if ( $this->numeric_version >= 8.2 && !$ignore ) {
 812                                 $first = true;
 813                                 foreach ( $args as $row ) {
 814                                         if ( $first ) {
 815                                                 $first = false;
 816                                         } else {
 817                                                 $sql .= ',';
 818                                         }
 819                                         $sql .= '(' . $this->makeList( $row ) . ')';
 820                                 }
 821                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 822                         }
 823                         else {
 824                                 $res = true;
 825                                 $origsql = $sql;
 826                                 foreach ( $args as $row ) {
 827                                         $tempsql = $origsql;
 828                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 829
 830                                         if ( $ignore ) {
 831                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 832                                         }
 833
 834                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 835
 836                                         if ( $ignore ) {
 837                                                 $bar = pg_last_error();
 838                                                 if ($bar != false) {
 839                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 840                                                 }
 841                                                 else {
 842                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 843                                                         $numrowsinserted++;
 844                                                 }
 845                                         }
 846
 847                                         // If any of them fail, we fail overall for this function call
 848                                         // Note that this will be ignored if IGNORE is set
 849                                         if (! $tempres)
 850                                                 $res = false;
 851                                 }
 852                         }
 853                 }
 854                 else {
 855                         // Not multi, just a lone insert
 856                         if ( $ignore ) {
 857                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 858                         }
 859
 860                         $sql .= '(' . $this->makeList( $args ) . ')';
 861                         $res = (bool)$this->query( $sql, $fname, $ignore );
 862                         if ( $ignore ) {
 863                                 $bar = pg_last_error();
 864                                 if ($bar != false) {
 865                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 866                                 }
 867                                 else {
 868                                         pg_query( $this->mConn, "RELEASE $ignore" );
 869                                         $numrowsinserted++;
 870                                 }
 871                         }
 872                 }
 873                 if ( $ignore ) {
 874                         $olde = error_reporting( $olde );
 875                         if ($didbegin) {
 876                                 $this->commit();
 877                         }
 878
 879                         // Set the affected row count for the whole operation
 880                         $this->mAffectedRows = $numrowsinserted;
 881
 882                         // IGNORE always returns true
 883                         return true;
 884                 }
 885
 886
 887                 return $res;
 888
 889         }
 890
 891         /**
 892          * INSERT SELECT wrapper
 893          * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
 894          * Source items may be literals rather then field names, but strings should be quoted with Database::addQuotes()
 895          * $conds may be "*" to copy the whole table
 896          * srcTable may be an array of tables.
 897          * @todo FIXME: implement this a little better (seperate select/insert)?
 898         */
 899         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabasePostgres::insertSelect',
 900                 $insertOptions = array(), $selectOptions = array() )
 901         {
 902                 $destTable = $this->tableName( $destTable );
 903
 904                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 905                 $ignore = in_array( 'IGNORE', $insertOptions ) ? 'mw' : '';
 906
 907                 if( is_array( $insertOptions ) ) {
 908                         $insertOptions = implode( ' ', $insertOptions );
 909                 }
 910                 if( !is_array( $selectOptions ) ) {
 911                         $selectOptions = array( $selectOptions );
 912                 }
 913                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 914                 if( is_array( $srcTable ) ) {
 915                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 916                 } else {
 917                         $srcTable = $this->tableName( $srcTable );
 918                 }
 919
 920                 // If we are not in a transaction, we need to be for savepoint trickery
 921                 $didbegin = 0;
 922                 if ( $ignore ) {
 923                         if( !$this->mTrxLevel ) {
 924                                 $this->begin();
 925                                 $didbegin = 1;
 926                         }
 927                         $olde = error_reporting( 0 );
 928                         $numrowsinserted = 0;
 929                         pg_query( $this->mConn, "SAVEPOINT $ignore");
 930                 }
 931
 932                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 933                                 " SELECT $startOpts " . implode( ',', $varMap ) .
 934                                 " FROM $srcTable $useIndex";
 935
 936                 if ( $conds != '*') {
 937                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 938                 }
 939
 940                 $sql .= " $tailOpts";
 941
 942                 $res = (bool)$this->query( $sql, $fname, $ignore );
 943                 if( $ignore ) {
 944                         $bar = pg_last_error();
 945                         if( $bar != false ) {
 946                                 pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 947                         } else {
 948                                 pg_query( $this->mConn, "RELEASE $ignore" );
 949                                 $numrowsinserted++;
 950                         }
 951                         $olde = error_reporting( $olde );
 952                         if( $didbegin ) {
 953                                 $this->commit();
 954                         }
 955
 956                         // Set the affected row count for the whole operation
 957                         $this->mAffectedRows = $numrowsinserted;
 958
 959                         // IGNORE always returns true
 960                         return true;
 961                 }
 962
 963                 return $res;
 964         }
 965
 966         function tableName( $name ) {
 967                 # Replace reserved words with better ones
 968                 switch( $name ) {
 969                         case 'user':
 970                                 return 'mwuser';
 971                         case 'text':
 972                                 return 'pagecontent';
 973                         default:
 974                                 return $name;
 975                 }
 976         }
 977
 978         /**
 979          * Return the next in a sequence, save the value for retrieval via insertId()
 980          */
 981         function nextSequenceValue( $seqName ) {
 982                 $safeseq = preg_replace( "/'/", "''", $seqName );
 983                 $res = $this->query( "SELECT nextval('$safeseq')" );
 984                 $row = $this->fetchRow( $res );
 985                 $this->mInsertId = $row[0];
 986                 return $this->mInsertId;
 987         }
 988
 989         /**
 990          * Return the current value of a sequence. Assumes it has been nextval'ed in this session.
 991          */
 992         function currentSequenceValue( $seqName ) {
 993                 $safeseq = preg_replace( "/'/", "''", $seqName );
 994                 $res = $this->query( "SELECT currval('$safeseq')" );
 995                 $row = $this->fetchRow( $res );
 996                 $currval = $row[0];
 997                 return $currval;
 998         }
 999
1000         # REPLACE query wrapper
1001         # Postgres simulates this with a DELETE followed by INSERT
1002         # $row is the row to insert, an associative array
1003         # $uniqueIndexes is an array of indexes. Each element may be either a
1004         # field name or an array of field names
1005         #
1006         # It may be more efficient to leave off unique indexes which are unlikely to collide.
1007         # However if you do this, you run the risk of encountering errors which wouldn't have
1008         # occurred in MySQL
1009         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabasePostgres::replace' ) {
1010                 $table = $this->tableName( $table );
1011
1012                 if (count($rows)==0) {
1013                         return;
1014                 }
1015
1016                 # Single row case
1017                 if ( !is_array( reset( $rows ) ) ) {
1018                         $rows = array( $rows );
1019                 }
1020
1021                 foreach( $rows as $row ) {
1022                         # Delete rows which collide
1023                         if ( $uniqueIndexes ) {
1024                                 $sql = "DELETE FROM $table WHERE ";
1025                                 $first = true;
1026                                 foreach ( $uniqueIndexes as $index ) {
1027                                         if ( $first ) {
1028                                                 $first = false;
1029                                                 $sql .= "(";
1030                                         } else {
1031                                                 $sql .= ') OR (';
1032                                         }
1033                                         if ( is_array( $index ) ) {
1034                                                 $first2 = true;
1035                                                 foreach ( $index as $col ) {
1036                                                         if ( $first2 ) {
1037                                                                 $first2 = false;
1038                                                         } else {
1039                                                                 $sql .= ' AND ';
1040                                                         }
1041                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
1042                                                 }
1043                                         } else {
1044                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
1045                                         }
1046                                 }
1047                                 $sql .= ')';
1048                                 $this->query( $sql, $fname );
1049                         }
1050
1051                         # Now insert the row
1052                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
1053                                 $this->makeList( $row, LIST_COMMA ) . ')';
1054                         $this->query( $sql, $fname );
1055                 }
1056         }
1057
1058         # DELETE where the condition is a join
1059         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabasePostgres::deleteJoin' ) {
1060                 if ( !$conds ) {
1061                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
1062                 }
1063
1064                 $delTable = $this->tableName( $delTable );
1065                 $joinTable = $this->tableName( $joinTable );
1066                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
1067                 if ( $conds != '*' ) {
1068                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
1069                 }
1070                 $sql .= ')';
1071
1072                 $this->query( $sql, $fname );
1073         }
1074
1075         # Returns the size of a text field, or -1 for "unlimited"
1076         function textFieldSize( $table, $field ) {
1077                 $table = $this->tableName( $table );
1078                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
1079                         FROM pg_class c, pg_attribute a, pg_type t
1080                         WHERE relname='$table' AND a.attrelid=c.oid AND
1081                                 a.atttypid=t.oid and a.attname='$field'";
1082                 $res =$this->query($sql);
1083                 $row=$this->fetchObject($res);
1084                 if ($row->ftype=="varchar") {
1085                         $size=$row->size-4;
1086                 } else {
1087                         $size=$row->size;
1088                 }
1089                 return $size;
1090         }
1091
1092         function limitResult($sql, $limit, $offset=false) {
1093                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
1094         }
1095
1096         function wasDeadlock() {
1097                 return $this->lastErrno() == '40P01';
1098         }
1099
1100         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabasePostgres::duplicateTableStructure' ) {
1101                 return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
1102         }
1103
1104         function timestamp( $ts=0 ) {
1105                 return wfTimestamp(TS_POSTGRES,$ts);
1106         }
1107
1108         /**
1109          * Return aggregated value function call
1110          */
1111         function aggregateValue ($valuedata,$valuename='value') {
1112                 return $valuedata;
1113         }
1114
1115
1116         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1117                 // Ignore errors during error handling to avoid infinite recursion
1118                 $ignore = $this->ignoreErrors( true );
1119                 $this->mErrorCount++;
1120
1121                 if ($ignore || $tempIgnore) {
1122                         wfDebug("SQL ERROR (ignored): $error\n");
1123                         $this->ignoreErrors( $ignore );
1124                 }
1125                 else {
1126                         $message = "A database error has occurred\n" .
1127                                 "Query: $sql\n" .
1128                                 "Function: $fname\n" .
1129                                 "Error: $errno $error\n";
1130                         throw new DBUnexpectedError($this, $message);
1131                 }
1132         }
1133
1134         /**
1135          * @return string wikitext of a link to the server software's web site
1136          */
1137         function getSoftwareLink() {
1138                 return "[http://www.postgresql.org/ PostgreSQL]";
1139         }
1140
1141         /**
1142          * @return string Version information from the database
1143          */
1144         function getServerVersion() {
1145                 if ( !isset( $this->numeric_version ) ) {
1146                         $versionInfo = pg_version( $this->mConn );
1147                         if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
1148                                 // Old client, abort install
1149                                 $this->numeric_version = '7.3 or earlier';
1150                         } elseif ( isset( $versionInfo['server'] ) ) {
1151                                 // Normal client
1152                                 $this->numeric_version = $versionInfo['server'];
1153                         } else {
1154                                 // Bug 16937: broken pgsql extension from PHP<5.3
1155                                 $this->numeric_version = pg_parameter_status( $this->mConn, 'server_version' );
1156                         }
1157                 }
1158                 return $this->numeric_version;
1159         }
1160
1161         /**
1162          * Query whether a given relation exists (in the given schema, or the
1163          * default mw one if not given)
1164          */
1165         function relationExists( $table, $types, $schema = false ) {
1166                 global $wgDBmwschema;
1167                 if ( !is_array( $types ) )
1168                         $types = array( $types );
1169                 if ( !$schema )
1170                         $schema = $wgDBmwschema;
1171                 $etable = $this->addQuotes( $table );
1172                 $eschema = $this->addQuotes( $schema );
1173                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1174                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1175                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1176                 $res = $this->query( $SQL );
1177                 $count = $res ? $res->numRows() : 0;
1178                 return $count ? true : false;
1179         }
1180
1181         /*
1182          * For backward compatibility, this function checks both tables and
1183          * views.
1184          */
1185         function tableExists( $table, $schema = false ) {
1186                 return $this->relationExists( $table, array( 'r', 'v' ), $schema );
1187         }
1188
1189         function sequenceExists( $sequence, $schema = false ) {
1190                 return $this->relationExists( $sequence, 'S', $schema );
1191         }
1192
1193         function triggerExists( $table, $trigger ) {
1194                 global $wgDBmwschema;
1195
1196                 $q = <<<SQL
1197         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1198                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1199                       AND tgrelid=pg_class.oid
1200                       AND nspname=%s AND relname=%s AND tgname=%s
1201 SQL;
1202                 $res = $this->query(sprintf($q,
1203                                 $this->addQuotes($wgDBmwschema),
1204                                 $this->addQuotes($table),
1205                                 $this->addQuotes($trigger)));
1206                 if (!$res)
1207                         return null;
1208                 $rows = $res->numRows();
1209                 return $rows;
1210         }
1211
1212         function ruleExists( $table, $rule ) {
1213                 global $wgDBmwschema;
1214                 $exists = $this->selectField("pg_rules", "rulename",
1215                                 array(  "rulename" => $rule,
1216                                         "tablename" => $table,
1217                                         "schemaname" => $wgDBmwschema ) );
1218                 return $exists === $rule;
1219         }
1220
1221         function constraintExists( $table, $constraint ) {
1222                 global $wgDBmwschema;
1223                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1224                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1225                         $this->addQuotes($wgDBmwschema),
1226                         $this->addQuotes($table),
1227                         $this->addQuotes($constraint));
1228                 $res = $this->query($SQL);
1229                 if (!$res)
1230                         return null;
1231                 $rows = $res->numRows();
1232                 return $rows;
1233         }
1234
1235         /**
1236          * Query whether a given schema exists. Returns the name of the owner
1237          */
1238         function schemaExists( $schema ) {
1239                 $eschema = preg_replace("/'/", "''", $schema);
1240                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1241                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1242                 $res = $this->query( $SQL );
1243                 if ( $res && $res->numRows() ) {
1244                         $row = $res->fetchObject();
1245                         $owner = $row->rolname;
1246                 } else {
1247                         $owner = false;
1248                 }
1249                 return $owner;
1250         }
1251
1252         function fieldInfo( $table, $field ) {
1253                 return PostgresField::fromText($this, $table, $field);
1254         }
1255
1256         /**
1257          * pg_field_type() wrapper
1258          */
1259         function fieldType( $res, $index ) {
1260                 if ( $res instanceof ResultWrapper ) {
1261                         $res = $res->result;
1262                 }
1263                 return pg_field_type( $res, $index );
1264         }
1265
1266         /* Not even sure why this is used in the main codebase... */
1267         function limitResultForUpdate( $sql, $num ) {
1268                 return $sql;
1269         }
1270
1271         function setup_database() {
1272                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1273
1274                 // Make sure that we can write to the correct schema
1275                 // If not, Postgres will happily and silently go to the next search_path item
1276                 $ctest = "mediawiki_test_table";
1277                 $safeschema = $this->quote_ident($wgDBmwschema);
1278                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1279                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1280                 }
1281                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1282                 $olde = error_reporting( 0 );
1283                 $res = $this->doQuery($SQL);
1284                 error_reporting( $olde );
1285                 if (!$res) {
1286                         print "<b>FAILED</b>. Make sure that the user \"" . htmlspecialchars( $wgDBuser ) .
1287                                 "\" can write to the schema \"" . htmlspecialchars( $wgDBmwschema ) . "\"</li>\n";
1288                         dieout(""); # Will close the main list <ul> and finish the page.
1289                 }
1290                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1291
1292                 $res = $this->sourceFile( "../maintenance/postgres/tables.sql" );
1293                 if ($res === true) {
1294                         print " done.</li>\n";
1295                 } else {
1296                         print " <b>FAILED</b></li>\n";
1297                         dieout( htmlspecialchars( $res ) );
1298                 }
1299
1300                 ## Update version information
1301                 $mwv = $this->addQuotes($wgVersion);
1302                 $pgv = $this->addQuotes($this->getServerVersion());
1303                 $pgu = $this->addQuotes($this->mUser);
1304                 $mws = $this->addQuotes($wgDBmwschema);
1305                 $tss = $this->addQuotes($wgDBts2schema);
1306                 $pgp = $this->addQuotes($wgDBport);
1307                 $dbn = $this->addQuotes($this->mDBname);
1308                 $ctype = $this->addQuotes( pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0) );
1309
1310                 echo "<li>Populating interwiki table... ";
1311                 ## Avoid the non-standard "REPLACE INTO" syntax
1312                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1313                 if ( !$f ) {
1314                         print "<b>FAILED</b></li>";
1315                         dieout( "Could not find the interwiki.sql file" );
1316                 }
1317                 ## We simply assume it is already empty as we have just created it
1318                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1319                 while ( ! feof( $f ) ) {
1320                         $line = fgets($f,1024);
1321                         $matches = array();
1322                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1323                                 continue;
1324                         }
1325                         $this->query("$SQL $matches[1],$matches[2])");
1326                 }
1327                 print " successfully populated.</li>\n";
1328
1329                 $this->doQuery("COMMIT");
1330         }
1331
1332         function encodeBlob( $b ) {
1333                 return new Blob ( pg_escape_bytea( $b ) ) ;
1334         }
1335
1336         function decodeBlob( $b ) {
1337                 if ($b instanceof Blob) {
1338                         $b = $b->fetch();
1339                 }
1340                 return pg_unescape_bytea( $b );
1341         }
1342
1343         function strencode( $s ) { ## Should not be called by us
1344                 return pg_escape_string( $s );
1345         }
1346
1347         function addQuotes( $s ) {
1348                 if ( is_null( $s ) ) {
1349                         return 'NULL';
1350                 } else if ( is_bool( $s ) ) {
1351                         return intval( $s );
1352                 } else if ($s instanceof Blob) {
1353                         return "'".$s->fetch($s)."'";
1354                 }
1355                 return "'" . pg_escape_string($s) . "'";
1356         }
1357
1358         function quote_ident( $s ) {
1359                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1360         }
1361
1362         /**
1363          * Postgres specific version of replaceVars.
1364          * Calls the parent version in Database.php
1365          *
1366          * @private
1367          *
1368          * @param $ins String: SQL string, read from a stream (usually tables.sql)
1369          *
1370          * @return string SQL string
1371          */
1372         protected function replaceVars( $ins ) {
1373
1374                 $ins = parent::replaceVars( $ins );
1375
1376                 if ($this->numeric_version >= 8.3) {
1377                         // Thanks for not providing backwards-compatibility, 8.3
1378                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1379                 }
1380
1381                 if ($this->numeric_version <= 8.1) { // Our minimum version
1382                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1383                 }
1384
1385                 return $ins;
1386         }
1387
1388         /**
1389          * Various select options
1390          *
1391          * @private
1392          *
1393          * @param $options Array: an associative array of options to be turned into
1394          *              an SQL query, valid keys are listed in the function.
1395          * @return array
1396          */
1397         function makeSelectOptions( $options ) {
1398                 $preLimitTail = $postLimitTail = '';
1399                 $startOpts = $useIndex = '';
1400
1401                 $noKeyOptions = array();
1402                 foreach ( $options as $key => $option ) {
1403                         if ( is_numeric( $key ) ) {
1404                                 $noKeyOptions[$option] = true;
1405                         }
1406                 }
1407
1408                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1409                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1410                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1411
1412                 //if (isset($options['LIMIT'])) {
1413                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1414                 //              isset($options['OFFSET']) ? $options['OFFSET']
1415                 //              : false);
1416                 //}
1417
1418                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1419                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1420                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1421
1422                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1423         }
1424
1425         function setFakeMaster( $enabled = true ) {}
1426
1427         function getDBname() {
1428                 return $this->mDBname;
1429         }
1430
1431         function getServer() {
1432                 return $this->mServer;
1433         }
1434
1435         function buildConcat( $stringList ) {
1436                 return implode( ' || ', $stringList );
1437         }
1438
1439         public function getSearchEngine() {
1440                 return "SearchPostgres";
1441         }
1442 } // end DatabasePostgres class