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                 $failFunction = false, $flags = 0 )
 101         {
 102
 103                 $this->mFailFunction = $failFunction;
 104                 $this->mFlags = $flags;
 105                 $this->open( $server, $user, $password, $dbName);
 106
 107         }
 108
 109         function getType() {
 110                 return 'postgres';
 111         }
 112
 113         function cascadingDeletes() {
 114                 return true;
 115         }
 116         function cleanupTriggers() {
 117                 return true;
 118         }
 119         function strictIPs() {
 120                 return true;
 121         }
 122         function realTimestamps() {
 123                 return true;
 124         }
 125         function implicitGroupby() {
 126                 return false;
 127         }
 128         function implicitOrderby() {
 129                 return false;
 130         }
 131         function searchableIPs() {
 132                 return true;
 133         }
 134         function functionalIndexes() {
 135                 return true;
 136         }
 137
 138         function hasConstraint( $name ) {
 139                 global $wgDBmwschema;
 140                 $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) ."'";
 141                 return $this->numRows($res = $this->doQuery($SQL));
 142         }
 143
 144         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 145         {
 146                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 147         }
 148
 149         /**
 150          * Usually aborts on failure
 151          * If the failFunction is set to a non-zero integer, returns success
 152          */
 153         function open( $server, $user, $password, $dbName ) {
 154                 # Test for Postgres support, to avoid suppressed fatal error
 155                 if ( !function_exists( 'pg_connect' ) ) {
 156                         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" );
 157                 }
 158
 159                 global $wgDBport;
 160
 161                 if (!strlen($user)) { ## e.g. the class is being loaded
 162                         return;
 163                 }
 164                 $this->close();
 165                 $this->mServer = $server;
 166                 $this->mPort = $port = $wgDBport;
 167                 $this->mUser = $user;
 168                 $this->mPassword = $password;
 169                 $this->mDBname = $dbName;
 170
 171                 $connectVars = array(
 172                         'dbname' => $dbName,
 173                         'user' => $user,
 174                         'password' => $password );
 175                 if ($server!=false && $server!="") {
 176                         $connectVars['host'] = $server;
 177                 }
 178                 if ($port!=false && $port!="") {
 179                         $connectVars['port'] = $port;
 180                 }
 181                 $connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
 182
 183                 $this->installErrorHandler();
 184                 $this->mConn = pg_connect( $connectString );
 185                 $phpError = $this->restoreErrorHandler();
 186
 187                 if ( !$this->mConn ) {
 188                         wfDebug( "DB connection error\n" );
 189                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 190                         wfDebug( $this->lastError()."\n" );
 191                         if ( !$this->mFailFunction ) {
 192                                 throw new DBConnectionError( $this, $phpError );
 193                         } else {
 194                                 return false;
 195                         }
 196                 }
 197
 198                 $this->mOpened = true;
 199
 200                 global $wgCommandLineMode;
 201                 ## If called from the command-line (e.g. importDump), only show errors
 202                 if ($wgCommandLineMode) {
 203                         $this->doQuery( "SET client_min_messages = 'ERROR'" );
 204                 }
 205
 206                 $this->doQuery( "SET client_encoding='UTF8'" );
 207
 208                 global $wgDBmwschema, $wgDBts2schema;
 209                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 210                         && $wgDBmwschema !== 'mediawiki'
 211                         && preg_match( '/^\w+$/', $wgDBmwschema )
 212                         && preg_match( '/^\w+$/', $wgDBts2schema )
 213                 ) {
 214                         $safeschema = $this->quote_ident($wgDBmwschema);
 215                         $safeschema2 = $this->quote_ident($wgDBts2schema);
 216                         $this->doQuery( "SET search_path = $safeschema, $wgDBts2schema, public" );
 217                 }
 218
 219                 return $this->mConn;
 220         }
 221
 222         function makeConnectionString( $vars ) {
 223                 $s = '';
 224                 foreach ( $vars as $name => $value ) {
 225                         $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
 226                 }
 227                 return $s;
 228         }
 229
 230
 231         function initial_setup($superuser, $password, $dbName) {
 232                 // If this is the initial connection, setup the schema stuff and possibly create the user
 233                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBmwschema, $wgDBts2schema;
 234
 235                 print "<li>Checking the version of Postgres...";
 236                 $version = $this->getServerVersion();
 237                 $PGMINVER = '8.1';
 238                 if ($version < $PGMINVER) {
 239                         print "<b>FAILED</b>. Required version is $PGMINVER. You have " . htmlspecialchars( $version ) . "</li>\n";
 240                         dieout("</ul>");
 241                 }
 242                 print "version " . htmlspecialchars( $this->numeric_version ) . " is OK.</li>\n";
 243
 244                 $safeuser = $this->quote_ident($wgDBuser);
 245                 // Are we connecting as a superuser for the first time?
 246                 if ($superuser) {
 247                         // Are we really a superuser? Check out our rights
 248                         $SQL = "SELECT
 249                       CASE WHEN usesuper IS TRUE THEN
 250                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 251                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 252                     END AS rights
 253                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($superuser);
 254                         $rows = $this->numRows($res = $this->doQuery($SQL));
 255                         if (!$rows) {
 256                                 print "<li>ERROR: Could not read permissions for user \"" . htmlspecialchars( $superuser ) . "\"</li>\n";
 257                                 dieout('</ul>');
 258                         }
 259                         $perms = pg_fetch_result($res, 0, 0);
 260
 261                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 262                         $rows = $this->numRows($this->doQuery($SQL));
 263                         if ($rows) {
 264                                 print "<li>User \"" . htmlspecialchars( $wgDBuser ) . "\" already exists, skipping account creation.</li>";
 265                         }
 266                         else {
 267                                 if ($perms != 1 and $perms != 3) {
 268                                         print "<li>ERROR: the user \"" . htmlspecialchars( $superuser ) . "\" cannot create other users. ";
 269                                         print 'Please use a different Postgres user.</li>';
 270                                         dieout('</ul>');
 271                                 }
 272                                 print "<li>Creating user <b>" . htmlspecialchars( $wgDBuser ) . "</b>...";
 273                                 $safepass = $this->addQuotes($wgDBpassword);
 274                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 275                                 $this->doQuery($SQL);
 276                                 print "OK</li>\n";
 277                         }
 278                         // User now exists, check out the database
 279                         if ($dbName != $wgDBname) {
 280                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 281                                 $rows = $this->numRows($this->doQuery($SQL));
 282                                 if ($rows) {
 283                                         print "<li>Database \"" . htmlspecialchars( $wgDBname ) . "\" already exists, skipping database creation.</li>";
 284                                 }
 285                                 else {
 286                                         if ($perms < 1) {
 287                                                 print "<li>ERROR: the user \"" . htmlspecialchars( $superuser ) . "\" cannot create databases. ";
 288                                                 print 'Please use a different Postgres user.</li>';
 289                                                 dieout('</ul>');
 290                                         }
 291                                         print "<li>Creating database <b>" . htmlspecialchars( $wgDBname ) . "</b>...";
 292                                         $safename = $this->quote_ident($wgDBname);
 293                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 294                                         $this->doQuery($SQL);
 295                                         print "OK</li>\n";
 296                                         // Hopefully tsearch2 and plpgsql are in template1...
 297                                 }
 298
 299                                 // Reconnect to check out tsearch2 rights for this user
 300                                 print "<li>Connecting to \"" . htmlspecialchars( $wgDBname ) . "\" as superuser \"" .
 301                                         htmlspecialchars( $superuser ) . "\" to check rights...";
 302
 303                                 $connectVars = array();
 304                                 if ($this->mServer!=false && $this->mServer!="") {
 305                                         $connectVars['host'] = $this->mServer;
 306                                 }
 307                                 if ($this->mPort!=false && $this->mPort!="") {
 308                                         $connectVars['port'] = $this->mPort;
 309                                 }
 310                                 $connectVars['dbname'] = $wgDBname;
 311                                 $connectVars['user'] = $superuser;
 312                                 $connectVars['password'] = $password;
 313
 314                                 @$this->mConn = pg_connect( $this->makeConnectionString( $connectVars ) );
 315                                 if ( !$this->mConn ) {
 316                                         print "<b>FAILED TO CONNECT!</b></li>";
 317                                         dieout("</ul>");
 318                                 }
 319                                 print "OK</li>\n";
 320                         }
 321
 322                         if ($this->numeric_version < 8.3) {
 323                                 // Tsearch2 checks
 324                                 print "<li>Checking that tsearch2 is installed in the database \"" .
 325                                         htmlspecialchars( $wgDBname ) . "\"...";
 326                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 327                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"" .
 328                                                 htmlspecialchars( $wgDBname ) . "\".";
 329                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 330                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 331                                         dieout("</ul>");
 332                                 }
 333                                 print "OK</li>\n";
 334                                 print "<li>Ensuring that user \"" . htmlspecialchars( $wgDBuser ) .
 335                                         "\" has select rights on the tsearch2 tables...";
 336                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 337                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 338                                         $this->doQuery($SQL);
 339                                 }
 340                                 print "OK</li>\n";
 341                         }
 342
 343                         // Setup the schema for this user if needed
 344                         $result = $this->schemaExists($wgDBmwschema);
 345                         $safeschema = $this->quote_ident($wgDBmwschema);
 346                         if (!$result) {
 347                                 print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
 348                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 349                                 if (!$result) {
 350                                         print "<b>FAILED</b>.</li>\n";
 351                                         dieout("</ul>");
 352                                 }
 353                                 print "OK</li>\n";
 354                         }
 355                         else {
 356                                 print "<li>Schema already exists, explicitly granting rights...\n";
 357                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 358                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 359                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 360                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 361                                         "AND p.relkind IN ('r','S','v')\n";
 362                                 $SQL .= "UNION\n";
 363                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 364                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 365                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 366                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 367                                 $res = $this->doQuery($SQL);
 368                                 if (!$res) {
 369                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 370                                         dieout("</ul>");
 371                                 }
 372                                 $this->doQuery("SET search_path = $safeschema");
 373                                 $rows = $this->numRows($res);
 374                                 while ($rows) {
 375                                         $rows--;
 376                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 377                                 }
 378                                 print "OK</li>";
 379                         }
 380
 381                         // Install plpgsql if needed
 382                         $this->setup_plpgsql();
 383
 384                         $superuser = '';
 385                         return true; // Reconnect as regular user
 386
 387                 } // end superuser
 388
 389                 if (!defined('POSTGRES_SEARCHPATH')) {
 390
 391                         if ($this->numeric_version < 8.3) {
 392                                 // Do we have the basic tsearch2 table?
 393                                 print "<li>Checking for tsearch2 in the schema \"" . htmlspecialchars( $wgDBts2schema ) . "\"...";
 394                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 395                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 396                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 397                                         print " for instructions.</li>\n";
 398                                         dieout("</ul>");
 399                                 }
 400                                 print "OK</li>\n";
 401
 402                                 // Does this user have the rights to the tsearch2 tables?
 403                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 404                                 print "<li>Checking tsearch2 permissions...";
 405                                 // Let's check all four, just to be safe
 406                                 error_reporting( 0 );
 407                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 408                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 409                                 foreach ( $ts2tables AS $tname ) {
 410                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 411                                         $res = $this->doQuery($SQL);
 412                                         if (!$res) {
 413                                                 print "<b>FAILED</b> to access " . htmlspecialchars( "pg_ts_$tname" ) .
 414                                                         ". Make sure that the user \"". htmlspecialchars( $wgDBuser ) .
 415                                                         "\" has SELECT access to all four tsearch2 tables</li>\n";
 416                                                 dieout("</ul>");
 417                                         }
 418                                 }
 419                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = " . $this->addQuotes( $ctype ) ;
 420                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 421                                 $res = $this->doQuery($SQL);
 422                                 error_reporting( E_ALL );
 423                                 if (!$res) {
 424                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 425                                         dieout("</ul>");
 426                                 }
 427                                 print "OK</li>";
 428
 429                                 // Will the current locale work? Can we force it to?
 430                                 print "<li>Verifying tsearch2 locale with " . htmlspecialchars( $ctype ) . "...";
 431                                 $rows = $this->numRows($res);
 432                                 $resetlocale = 0;
 433                                 if (!$rows) {
 434                                         print "<b>not found</b></li>\n";
 435                                         print "<li>Attempting to set default tsearch2 locale to \"" . htmlspecialchars( $ctype ) . "\"...";
 436                                         $resetlocale = 1;
 437                                 }
 438                                 else {
 439                                         $tsname = pg_fetch_result($res, 0, 0);
 440                                         if ($tsname != 'default') {
 441                                                 print "<b>not set to default (" . htmlspecialchars( $tsname ) . ")</b>";
 442                                                 print "<li>Attempting to change tsearch2 default locale to \"" .
 443                                                         htmlspecialchars( $ctype ) . "\"...";
 444                                                 $resetlocale = 1;
 445                                         }
 446                                 }
 447                                 if ($resetlocale) {
 448                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = " . $this->addQuotes( $ctype ) . " WHERE ts_name = 'default'";
 449                                         $res = $this->doQuery($SQL);
 450                                         if (!$res) {
 451                                                 print "<b>FAILED</b>. ";
 452                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"" .
 453                                                         htmlspecialchars( $ctype ) . "\"</li>\n";
 454                                                 dieout("</ul>");
 455                                         }
 456                                         print "OK</li>";
 457                                 }
 458
 459                                 // Final test: try out a simple tsearch2 query
 460                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 461                                 $res = $this->doQuery($SQL);
 462                                 if (!$res) {
 463                                         print "<b>FAILED</b>. Specifically, \"" . htmlspecialchars( $SQL ) . "\" did not work.</li>";
 464                                         dieout("</ul>");
 465                                 }
 466                                 print "OK</li>";
 467                         }
 468
 469                         // Install plpgsql if needed
 470                         $this->setup_plpgsql();
 471
 472                         // Does the schema already exist? Who owns it?
 473                         $result = $this->schemaExists($wgDBmwschema);
 474                         if (!$result) {
 475                                 print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
 476                                 error_reporting( 0 );
 477                                 $safeschema = $this->quote_ident($wgDBmwschema);
 478                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 479                                 error_reporting( E_ALL );
 480                                 if (!$result) {
 481                                         print "<b>FAILED</b>. The user \"" . htmlspecialchars( $wgDBuser ) .
 482                                                 "\" must be able to access the schema. ".
 483                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 484                                                 "different user, and then grant access to the \"" .
 485                                                 htmlspecialchars( $wgDBuser ) . "\" user.</li>\n";
 486                                         dieout("</ul>");
 487                                 }
 488                                 print "OK</li>\n";
 489                         }
 490                         else if ($result != $wgDBuser) {
 491                                 print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists but is not owned by \"" .
 492                                         htmlspecialchars( $wgDBuser ) . "\". Not ideal.</li>\n";
 493                         }
 494                         else {
 495                                 print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists and is owned by \"" .
 496                                         htmlspecialchars( $wgDBuser ) . "\". Excellent.</li>\n";
 497                         }
 498
 499                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 500                         print "<li>Setting the timezone to GMT for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 501                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 502                         $result = pg_query($this->mConn, $SQL);
 503                         if (!$result) {
 504                                 print "<b>FAILED</b>.</li>\n";
 505                                 dieout("</ul>");
 506                         }
 507                         print "OK</li>\n";
 508                         // Set for the rest of this session
 509                         $SQL = "SET timezone = 'GMT'";
 510                         $result = pg_query($this->mConn, $SQL);
 511                         if (!$result) {
 512                                 print "<li>Failed to set timezone</li>\n";
 513                                 dieout("</ul>");
 514                         }
 515
 516                         print "<li>Setting the datestyle to ISO, YMD for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 517                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 518                         $result = pg_query($this->mConn, $SQL);
 519                         if (!$result) {
 520                                 print "<b>FAILED</b>.</li>\n";
 521                                 dieout("</ul>");
 522                         }
 523                         print "OK</li>\n";
 524                         // Set for the rest of this session
 525                         $SQL = "SET datestyle = 'ISO, YMD'";
 526                         $result = pg_query($this->mConn, $SQL);
 527                         if (!$result) {
 528                                 print "<li>Failed to set datestyle</li>\n";
 529                                 dieout("</ul>");
 530                         }
 531
 532                         // Fix up the search paths if needed
 533                         print "<li>Setting the search path for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 534                         $path = $this->quote_ident($wgDBmwschema);
 535                         if ($wgDBts2schema !== $wgDBmwschema)
 536                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 537                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 538                                 $path .= ", public";
 539                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 540                         $result = pg_query($this->mConn, $SQL);
 541                         if (!$result) {
 542                                 print "<b>FAILED</b>.</li>\n";
 543                                 dieout("</ul>");
 544                         }
 545                         print "OK</li>\n";
 546                         // Set for the rest of this session
 547                         $SQL = "SET search_path = $path";
 548                         $result = pg_query($this->mConn, $SQL);
 549                         if (!$result) {
 550                                 print "<li>Failed to set search_path</li>\n";
 551                                 dieout("</ul>");
 552                         }
 553                         define( "POSTGRES_SEARCHPATH", $path );
 554                 }
 555         }
 556
 557
 558         function setup_plpgsql() {
 559                 print "<li>Checking for PL/pgSQL ...";
 560                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 561                 $rows = $this->numRows($this->doQuery($SQL));
 562                 if ($rows < 1) {
 563                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 564                         print "not installed. Attempting to install PL/pgSQL ...";
 565                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 566                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 567                         $rows = $this->numRows($this->doQuery($SQL));
 568                         global $wgDBname;
 569                         if ($rows >= 1) {
 570                                 $olde = error_reporting(0);
 571                                 error_reporting($olde - E_WARNING);
 572                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 573                                 error_reporting($olde);
 574                                 if (!$result) {
 575                                         print "<b>FAILED</b>. You need to install the language PL/pgSQL in the database <tt>" .
 576                                                 htmlspecialchars( $wgDBname ) . "</tt></li>";
 577                                         dieout("</ul>");
 578                                 }
 579                         }
 580                         else {
 581                                 print "<b>FAILED</b>. You need to install the language PL/pgSQL in the database <tt>" .
 582                                         htmlspecialchars( $wgDBname ) . "</tt></li>";
 583                                 dieout("</ul>");
 584                         }
 585                 }
 586                 print "OK</li>\n";
 587         }
 588
 589
 590         /**
 591          * Closes a database connection, if it is open
 592          * Returns success, true if already closed
 593          */
 594         function close() {
 595                 $this->mOpened = false;
 596                 if ( $this->mConn ) {
 597                         return pg_close( $this->mConn );
 598                 } else {
 599                         return true;
 600                 }
 601         }
 602
 603         function doQuery( $sql ) {
 604                 if (function_exists('mb_convert_encoding')) {
 605                         $sql = mb_convert_encoding($sql,'UTF-8');
 606                 }
 607                 $this->mLastResult = pg_query( $this->mConn, $sql);
 608                 $this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
 609                 return $this->mLastResult;
 610         }
 611
 612         function queryIgnore( $sql, $fname = '' ) {
 613                 return $this->query( $sql, $fname, true );
 614         }
 615
 616         function freeResult( $res ) {
 617                 if ( $res instanceof ResultWrapper ) {
 618                         $res = $res->result;
 619                 }
 620                 if ( !@pg_free_result( $res ) ) {
 621                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 622                 }
 623         }
 624
 625         function fetchObject( $res ) {
 626                 if ( $res instanceof ResultWrapper ) {
 627                         $res = $res->result;
 628                 }
 629                 @$row = pg_fetch_object( $res );
 630                 # FIXME: HACK HACK HACK HACK debug
 631
 632                 # TODO:
 633                 # hashar : not sure if the following test really trigger if the object
 634                 #          fetching failed.
 635                 if( pg_last_error($this->mConn) ) {
 636                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 637                 }
 638                 return $row;
 639         }
 640
 641         function fetchRow( $res ) {
 642                 if ( $res instanceof ResultWrapper ) {
 643                         $res = $res->result;
 644                 }
 645                 @$row = pg_fetch_array( $res );
 646                 if( pg_last_error($this->mConn) ) {
 647                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 648                 }
 649                 return $row;
 650         }
 651
 652         function numRows( $res ) {
 653                 if ( $res instanceof ResultWrapper ) {
 654                         $res = $res->result;
 655                 }
 656                 @$n = pg_num_rows( $res );
 657                 if( pg_last_error($this->mConn) ) {
 658                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 659                 }
 660                 return $n;
 661         }
 662         function numFields( $res ) {
 663                 if ( $res instanceof ResultWrapper ) {
 664                         $res = $res->result;
 665                 }
 666                 return pg_num_fields( $res );
 667         }
 668         function fieldName( $res, $n ) {
 669                 if ( $res instanceof ResultWrapper ) {
 670                         $res = $res->result;
 671                 }
 672                 return pg_field_name( $res, $n );
 673         }
 674
 675         /**
 676          * This must be called after nextSequenceVal
 677          */
 678         function insertId() {
 679                 return $this->mInsertId;
 680         }
 681
 682         function dataSeek( $res, $row ) {
 683                 if ( $res instanceof ResultWrapper ) {
 684                         $res = $res->result;
 685                 }
 686                 return pg_result_seek( $res, $row );
 687         }
 688
 689         function lastError() {
 690                 if ( $this->mConn ) {
 691                         return pg_last_error();
 692                 }
 693                 else {
 694                         return "No database connection";
 695                 }
 696         }
 697         function lastErrno() {
 698                 return pg_last_error() ? 1 : 0;
 699         }
 700
 701         function affectedRows() {
 702                 if ( !is_null( $this->mAffectedRows ) ) {
 703                         // Forced result for simulated queries
 704                         return $this->mAffectedRows;
 705                 }
 706                 if( empty( $this->mLastResult ) )
 707                         return 0;
 708                 return pg_affected_rows( $this->mLastResult );
 709         }
 710
 711         /**
 712          * Estimate rows in dataset
 713          * Returns estimated count, based on EXPLAIN output
 714          * This is not necessarily an accurate estimate, so use sparingly
 715          * Returns -1 if count cannot be found
 716          * Takes same arguments as Database::select()
 717          */
 718
 719         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
 720                 $options['EXPLAIN'] = true;
 721                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 722                 $rows = -1;
 723                 if ( $res ) {
 724                         $row = $this->fetchRow( $res );
 725                         $count = array();
 726                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 727                                 $rows = $count[1];
 728                         }
 729                         $this->freeResult($res);
 730                 }
 731                 return $rows;
 732         }
 733
 734
 735         /**
 736          * Returns information about an index
 737          * If errors are explicitly ignored, returns NULL on failure
 738          */
 739         function indexInfo( $table, $index, $fname = 'DatabasePostgres::indexInfo' ) {
 740                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 741                 $res = $this->query( $sql, $fname );
 742                 if ( !$res ) {
 743                         return null;
 744                 }
 745                 while ( $row = $this->fetchObject( $res ) ) {
 746                         if ( $row->indexname == $this->indexName( $index ) ) {
 747                                 return $row;
 748                         }
 749                 }
 750                 return false;
 751         }
 752
 753         function indexUnique ($table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
 754                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 755                         " AND indexdef LIKE 'CREATE UNIQUE%(" .
 756                         $this->strencode( $this->indexName( $index ) ) .
 757                         ")'";
 758                 $res = $this->query( $sql, $fname );
 759                 if ( !$res )
 760                         return null;
 761                 while ($row = $this->fetchObject( $res ))
 762                         return true;
 763                 return false;
 764
 765         }
 766
 767         /**
 768          * INSERT wrapper, inserts an array into a table
 769          *
 770          * $args may be a single associative array, or an array of these with numeric keys,
 771          * for multi-row insert (Postgres version 8.2 and above only).
 772          *
 773          * @param $table   String: Name of the table to insert to.
 774          * @param $args    Array: Items to insert into the table.
 775          * @param $fname   String: Name of the function, for profiling
 776          * @param $options String or Array. Valid options: IGNORE
 777          *
 778          * @return bool Success of insert operation. IGNORE always returns true.
 779          */
 780         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 781                 if ( !count( $args ) ) {
 782                         return true;
 783                 }
 784
 785                 $table = $this->tableName( $table );
 786                 if (! isset( $this->numeric_version ) ) {
 787                         $this->getServerVersion();
 788                 }
 789
 790                 if ( !is_array( $options ) )
 791                         $options = array( $options );
 792
 793                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 794                         $multi = true;
 795                         $keys = array_keys( $args[0] );
 796                 }
 797                 else {
 798                         $multi = false;
 799                         $keys = array_keys( $args );
 800                 }
 801
 802                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 803                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 804
 805                 // If we are not in a transaction, we need to be for savepoint trickery
 806                 $didbegin = 0;
 807                 if ( $ignore ) {
 808                         if (! $this->mTrxLevel) {
 809                                 $this->begin();
 810                                 $didbegin = 1;
 811                         }
 812                         $olde = error_reporting( 0 );
 813                         // For future use, we may want to track the number of actual inserts
 814                         // Right now, insert (all writes) simply return true/false
 815                         $numrowsinserted = 0;
 816                 }
 817
 818                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 819
 820                 if ( $multi ) {
 821                         if ( $this->numeric_version >= 8.2 && !$ignore ) {
 822                                 $first = true;
 823                                 foreach ( $args as $row ) {
 824                                         if ( $first ) {
 825                                                 $first = false;
 826                                         } else {
 827                                                 $sql .= ',';
 828                                         }
 829                                         $sql .= '(' . $this->makeList( $row ) . ')';
 830                                 }
 831                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 832                         }
 833                         else {
 834                                 $res = true;
 835                                 $origsql = $sql;
 836                                 foreach ( $args as $row ) {
 837                                         $tempsql = $origsql;
 838                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 839
 840                                         if ( $ignore ) {
 841                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 842                                         }
 843
 844                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 845
 846                                         if ( $ignore ) {
 847                                                 $bar = pg_last_error();
 848                                                 if ($bar != false) {
 849                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 850                                                 }
 851                                                 else {
 852                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 853                                                         $numrowsinserted++;
 854                                                 }
 855                                         }
 856
 857                                         // If any of them fail, we fail overall for this function call
 858                                         // Note that this will be ignored if IGNORE is set
 859                                         if (! $tempres)
 860                                                 $res = false;
 861                                 }
 862                         }
 863                 }
 864                 else {
 865                         // Not multi, just a lone insert
 866                         if ( $ignore ) {
 867                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 868                         }
 869
 870                         $sql .= '(' . $this->makeList( $args ) . ')';
 871                         $res = (bool)$this->query( $sql, $fname, $ignore );
 872                         if ( $ignore ) {
 873                                 $bar = pg_last_error();
 874                                 if ($bar != false) {
 875                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 876                                 }
 877                                 else {
 878                                         pg_query( $this->mConn, "RELEASE $ignore" );
 879                                         $numrowsinserted++;
 880                                 }
 881                         }
 882                 }
 883                 if ( $ignore ) {
 884                         $olde = error_reporting( $olde );
 885                         if ($didbegin) {
 886                                 $this->commit();
 887                         }
 888
 889                         // Set the affected row count for the whole operation
 890                         $this->mAffectedRows = $numrowsinserted;
 891
 892                         // IGNORE always returns true
 893                         return true;
 894                 }
 895
 896
 897                 return $res;
 898
 899         }
 900
 901         /**
 902          * INSERT SELECT wrapper
 903          * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
 904          * Source items may be literals rather then field names, but strings should be quoted with Database::addQuotes()
 905          * $conds may be "*" to copy the whole table
 906          * srcTable may be an array of tables.
 907          * @todo FIXME: implement this a little better (seperate select/insert)?
 908         */
 909         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabasePostgres::insertSelect',
 910                 $insertOptions = array(), $selectOptions = array() )
 911         {
 912                 $destTable = $this->tableName( $destTable );
 913
 914                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 915                 $ignore = in_array( 'IGNORE', $insertOptions ) ? 'mw' : '';
 916
 917                 if( is_array( $insertOptions ) ) {
 918                         $insertOptions = implode( ' ', $insertOptions );
 919                 }
 920                 if( !is_array( $selectOptions ) ) {
 921                         $selectOptions = array( $selectOptions );
 922                 }
 923                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 924                 if( is_array( $srcTable ) ) {
 925                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 926                 } else {
 927                         $srcTable = $this->tableName( $srcTable );
 928                 }
 929
 930                 // If we are not in a transaction, we need to be for savepoint trickery
 931                 $didbegin = 0;
 932                 if ( $ignore ) {
 933                         if( !$this->mTrxLevel ) {
 934                                 $this->begin();
 935                                 $didbegin = 1;
 936                         }
 937                         $olde = error_reporting( 0 );
 938                         $numrowsinserted = 0;
 939                         pg_query( $this->mConn, "SAVEPOINT $ignore");
 940                 }
 941
 942                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 943                                 " SELECT $startOpts " . implode( ',', $varMap ) .
 944                                 " FROM $srcTable $useIndex";
 945
 946                 if ( $conds != '*') {
 947                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 948                 }
 949
 950                 $sql .= " $tailOpts";
 951
 952                 $res = (bool)$this->query( $sql, $fname, $ignore );
 953                 if( $ignore ) {
 954                         $bar = pg_last_error();
 955                         if( $bar != false ) {
 956                                 pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 957                         } else {
 958                                 pg_query( $this->mConn, "RELEASE $ignore" );
 959                                 $numrowsinserted++;
 960                         }
 961                         $olde = error_reporting( $olde );
 962                         if( $didbegin ) {
 963                                 $this->commit();
 964                         }
 965
 966                         // Set the affected row count for the whole operation
 967                         $this->mAffectedRows = $numrowsinserted;
 968
 969                         // IGNORE always returns true
 970                         return true;
 971                 }
 972
 973                 return $res;
 974         }
 975
 976         function tableName( $name ) {
 977                 # Replace reserved words with better ones
 978                 switch( $name ) {
 979                         case 'user':
 980                                 return 'mwuser';
 981                         case 'text':
 982                                 return 'pagecontent';
 983                         default:
 984                                 return $name;
 985                 }
 986         }
 987
 988         /**
 989          * Return the next in a sequence, save the value for retrieval via insertId()
 990          */
 991         function nextSequenceValue( $seqName ) {
 992                 $safeseq = preg_replace( "/'/", "''", $seqName );
 993                 $res = $this->query( "SELECT nextval('$safeseq')" );
 994                 $row = $this->fetchRow( $res );
 995                 $this->mInsertId = $row[0];
 996                 $this->freeResult( $res );
 997                 return $this->mInsertId;
 998         }
 999
1000         /**
1001          * Return the current value of a sequence. Assumes it has been nextval'ed in this session.
1002          */
1003         function currentSequenceValue( $seqName ) {
1004                 $safeseq = preg_replace( "/'/", "''", $seqName );
1005                 $res = $this->query( "SELECT currval('$safeseq')" );
1006                 $row = $this->fetchRow( $res );
1007                 $currval = $row[0];
1008                 $this->freeResult( $res );
1009                 return $currval;
1010         }
1011
1012         # REPLACE query wrapper
1013         # Postgres simulates this with a DELETE followed by INSERT
1014         # $row is the row to insert, an associative array
1015         # $uniqueIndexes is an array of indexes. Each element may be either a
1016         # field name or an array of field names
1017         #
1018         # It may be more efficient to leave off unique indexes which are unlikely to collide.
1019         # However if you do this, you run the risk of encountering errors which wouldn't have
1020         # occurred in MySQL
1021         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabasePostgres::replace' ) {
1022                 $table = $this->tableName( $table );
1023
1024                 if (count($rows)==0) {
1025                         return;
1026                 }
1027
1028                 # Single row case
1029                 if ( !is_array( reset( $rows ) ) ) {
1030                         $rows = array( $rows );
1031                 }
1032
1033                 foreach( $rows as $row ) {
1034                         # Delete rows which collide
1035                         if ( $uniqueIndexes ) {
1036                                 $sql = "DELETE FROM $table WHERE ";
1037                                 $first = true;
1038                                 foreach ( $uniqueIndexes as $index ) {
1039                                         if ( $first ) {
1040                                                 $first = false;
1041                                                 $sql .= "(";
1042                                         } else {
1043                                                 $sql .= ') OR (';
1044                                         }
1045                                         if ( is_array( $index ) ) {
1046                                                 $first2 = true;
1047                                                 foreach ( $index as $col ) {
1048                                                         if ( $first2 ) {
1049                                                                 $first2 = false;
1050                                                         } else {
1051                                                                 $sql .= ' AND ';
1052                                                         }
1053                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
1054                                                 }
1055                                         } else {
1056                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
1057                                         }
1058                                 }
1059                                 $sql .= ')';
1060                                 $this->query( $sql, $fname );
1061                         }
1062
1063                         # Now insert the row
1064                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
1065                                 $this->makeList( $row, LIST_COMMA ) . ')';
1066                         $this->query( $sql, $fname );
1067                 }
1068         }
1069
1070         # DELETE where the condition is a join
1071         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabasePostgres::deleteJoin' ) {
1072                 if ( !$conds ) {
1073                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
1074                 }
1075
1076                 $delTable = $this->tableName( $delTable );
1077                 $joinTable = $this->tableName( $joinTable );
1078                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
1079                 if ( $conds != '*' ) {
1080                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
1081                 }
1082                 $sql .= ')';
1083
1084                 $this->query( $sql, $fname );
1085         }
1086
1087         # Returns the size of a text field, or -1 for "unlimited"
1088         function textFieldSize( $table, $field ) {
1089                 $table = $this->tableName( $table );
1090                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
1091                         FROM pg_class c, pg_attribute a, pg_type t
1092                         WHERE relname='$table' AND a.attrelid=c.oid AND
1093                                 a.atttypid=t.oid and a.attname='$field'";
1094                 $res =$this->query($sql);
1095                 $row=$this->fetchObject($res);
1096                 if ($row->ftype=="varchar") {
1097                         $size=$row->size-4;
1098                 } else {
1099                         $size=$row->size;
1100                 }
1101                 $this->freeResult( $res );
1102                 return $size;
1103         }
1104
1105         function limitResult($sql, $limit, $offset=false) {
1106                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
1107         }
1108
1109         function wasDeadlock() {
1110                 return $this->lastErrno() == '40P01';
1111         }
1112
1113         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabasePostgres::duplicateTableStructure' ) {
1114                 return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
1115         }
1116
1117         function timestamp( $ts=0 ) {
1118                 return wfTimestamp(TS_POSTGRES,$ts);
1119         }
1120
1121         /**
1122          * Return aggregated value function call
1123          */
1124         function aggregateValue ($valuedata,$valuename='value') {
1125                 return $valuedata;
1126         }
1127
1128
1129         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1130                 // Ignore errors during error handling to avoid infinite recursion
1131                 $ignore = $this->ignoreErrors( true );
1132                 $this->mErrorCount++;
1133
1134                 if ($ignore || $tempIgnore) {
1135                         wfDebug("SQL ERROR (ignored): $error\n");
1136                         $this->ignoreErrors( $ignore );
1137                 }
1138                 else {
1139                         $message = "A database error has occurred\n" .
1140                                 "Query: $sql\n" .
1141                                 "Function: $fname\n" .
1142                                 "Error: $errno $error\n";
1143                         throw new DBUnexpectedError($this, $message);
1144                 }
1145         }
1146
1147         /**
1148          * @return string wikitext of a link to the server software's web site
1149          */
1150         function getSoftwareLink() {
1151                 return "[http://www.postgresql.org/ PostgreSQL]";
1152         }
1153
1154         /**
1155          * @return string Version information from the database
1156          */
1157         function getServerVersion() {
1158                 if ( !isset( $this->numeric_version ) ) {
1159                         $versionInfo = pg_version( $this->mConn );
1160                         if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
1161                                 // Old client, abort install
1162                                 $this->numeric_version = '7.3 or earlier';
1163                         } elseif ( isset( $versionInfo['server'] ) ) {
1164                                 // Normal client
1165                                 $this->numeric_version = $versionInfo['server'];
1166                         } else {
1167                                 // Bug 16937: broken pgsql extension from PHP<5.3
1168                                 $this->numeric_version = pg_parameter_status( $this->mConn, 'server_version' );
1169                         }
1170                 }
1171                 return $this->numeric_version;
1172         }
1173
1174         /**
1175          * Query whether a given relation exists (in the given schema, or the
1176          * default mw one if not given)
1177          */
1178         function relationExists( $table, $types, $schema = false ) {
1179                 global $wgDBmwschema;
1180                 if ( !is_array( $types ) )
1181                         $types = array( $types );
1182                 if ( !$schema )
1183                         $schema = $wgDBmwschema;
1184                 $etable = $this->addQuotes( $table );
1185                 $eschema = $this->addQuotes( $schema );
1186                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1187                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1188                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1189                 $res = $this->query( $SQL );
1190                 $count = $res ? $res->numRows() : 0;
1191                 if ($res)
1192                         $this->freeResult( $res );
1193                 return $count ? true : false;
1194         }
1195
1196         /*
1197          * For backward compatibility, this function checks both tables and
1198          * views.
1199          */
1200         function tableExists( $table, $schema = false ) {
1201                 return $this->relationExists( $table, array( 'r', 'v' ), $schema );
1202         }
1203
1204         function sequenceExists( $sequence, $schema = false ) {
1205                 return $this->relationExists( $sequence, 'S', $schema );
1206         }
1207
1208         function triggerExists( $table, $trigger ) {
1209                 global $wgDBmwschema;
1210
1211                 $q = <<<SQL
1212         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1213                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1214                       AND tgrelid=pg_class.oid
1215                       AND nspname=%s AND relname=%s AND tgname=%s
1216 SQL;
1217                 $res = $this->query(sprintf($q,
1218                                 $this->addQuotes($wgDBmwschema),
1219                                 $this->addQuotes($table),
1220                                 $this->addQuotes($trigger)));
1221                 if (!$res)
1222                         return null;
1223                 $rows = $res->numRows();
1224                 $this->freeResult( $res );
1225                 return $rows;
1226         }
1227
1228         function ruleExists( $table, $rule ) {
1229                 global $wgDBmwschema;
1230                 $exists = $this->selectField("pg_rules", "rulename",
1231                                 array(  "rulename" => $rule,
1232                                         "tablename" => $table,
1233                                         "schemaname" => $wgDBmwschema ) );
1234                 return $exists === $rule;
1235         }
1236
1237         function constraintExists( $table, $constraint ) {
1238                 global $wgDBmwschema;
1239                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1240                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1241                         $this->addQuotes($wgDBmwschema),
1242                         $this->addQuotes($table),
1243                         $this->addQuotes($constraint));
1244                 $res = $this->query($SQL);
1245                 if (!$res)
1246                         return null;
1247                 $rows = $res->numRows();
1248                 $this->freeResult($res);
1249                 return $rows;
1250         }
1251
1252         /**
1253          * Query whether a given schema exists. Returns the name of the owner
1254          */
1255         function schemaExists( $schema ) {
1256                 $eschema = preg_replace("/'/", "''", $schema);
1257                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1258                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1259                 $res = $this->query( $SQL );
1260                 if ( $res && $res->numRows() ) {
1261                         $row = $res->fetchObject();
1262                         $owner = $row->rolname;
1263                 } else {
1264                         $owner = false;
1265                 }
1266                 if ($res)
1267                         $this->freeResult($res);
1268                 return $owner;
1269         }
1270
1271         function fieldInfo( $table, $field ) {
1272                 return PostgresField::fromText($this, $table, $field);
1273         }
1274
1275         /**
1276          * pg_field_type() wrapper
1277          */
1278         function fieldType( $res, $index ) {
1279                 if ( $res instanceof ResultWrapper ) {
1280                         $res = $res->result;
1281                 }
1282                 return pg_field_type( $res, $index );
1283         }
1284
1285         /* Not even sure why this is used in the main codebase... */
1286         function limitResultForUpdate( $sql, $num ) {
1287                 return $sql;
1288         }
1289
1290         function setup_database() {
1291                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1292
1293                 // Make sure that we can write to the correct schema
1294                 // If not, Postgres will happily and silently go to the next search_path item
1295                 $ctest = "mediawiki_test_table";
1296                 $safeschema = $this->quote_ident($wgDBmwschema);
1297                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1298                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1299                 }
1300                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1301                 $olde = error_reporting( 0 );
1302                 $res = $this->doQuery($SQL);
1303                 error_reporting( $olde );
1304                 if (!$res) {
1305                         print "<b>FAILED</b>. Make sure that the user \"" . htmlspecialchars( $wgDBuser ) .
1306                                 "\" can write to the schema \"" . htmlspecialchars( $wgDBmwschema ) . "\"</li>\n";
1307                         dieout(""); # Will close the main list <ul> and finish the page.
1308                 }
1309                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1310
1311                 $res = $this->sourceFile( "../maintenance/postgres/tables.sql" );
1312                 if ($res === true) {
1313                         print " done.</li>\n";
1314                 } else {
1315                         print " <b>FAILED</b></li>\n";
1316                         dieout( htmlspecialchars( $res ) );
1317                 }
1318
1319                 ## Update version information
1320                 $mwv = $this->addQuotes($wgVersion);
1321                 $pgv = $this->addQuotes($this->getServerVersion());
1322                 $pgu = $this->addQuotes($this->mUser);
1323                 $mws = $this->addQuotes($wgDBmwschema);
1324                 $tss = $this->addQuotes($wgDBts2schema);
1325                 $pgp = $this->addQuotes($wgDBport);
1326                 $dbn = $this->addQuotes($this->mDBname);
1327                 $ctype = $this->addQuotes( pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0) );
1328
1329                 echo "<li>Populating interwiki table... ";
1330                 ## Avoid the non-standard "REPLACE INTO" syntax
1331                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1332                 if ( !$f ) {
1333                         print "<b>FAILED</b></li>";
1334                         dieout( "Could not find the interwiki.sql file" );
1335                 }
1336                 ## We simply assume it is already empty as we have just created it
1337                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1338                 while ( ! feof( $f ) ) {
1339                         $line = fgets($f,1024);
1340                         $matches = array();
1341                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1342                                 continue;
1343                         }
1344                         $this->query("$SQL $matches[1],$matches[2])");
1345                 }
1346                 print " successfully populated.</li>\n";
1347
1348                 $this->doQuery("COMMIT");
1349         }
1350
1351         function encodeBlob( $b ) {
1352                 return new Blob ( pg_escape_bytea( $b ) ) ;
1353         }
1354
1355         function decodeBlob( $b ) {
1356                 if ($b instanceof Blob) {
1357                         $b = $b->fetch();
1358                 }
1359                 return pg_unescape_bytea( $b );
1360         }
1361
1362         function strencode( $s ) { ## Should not be called by us
1363                 return pg_escape_string( $s );
1364         }
1365
1366         function addQuotes( $s ) {
1367                 if ( is_null( $s ) ) {
1368                         return 'NULL';
1369                 } else if ( is_bool( $s ) ) {
1370                         return intval( $s );
1371                 } else if ($s instanceof Blob) {
1372                         return "'".$s->fetch($s)."'";
1373                 }
1374                 return "'" . pg_escape_string($s) . "'";
1375         }
1376
1377         function quote_ident( $s ) {
1378                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1379         }
1380
1381         /**
1382          * Postgres specific version of replaceVars.
1383          * Calls the parent version in Database.php
1384          *
1385          * @private
1386          *
1387          * @param $ins String: SQL string, read from a stream (usually tables.sql)
1388          *
1389          * @return string SQL string
1390          */
1391         protected function replaceVars( $ins ) {
1392
1393                 $ins = parent::replaceVars( $ins );
1394
1395                 if ($this->numeric_version >= 8.3) {
1396                         // Thanks for not providing backwards-compatibility, 8.3
1397                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1398                 }
1399
1400                 if ($this->numeric_version <= 8.1) { // Our minimum version
1401                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1402                 }
1403
1404                 return $ins;
1405         }
1406
1407         /**
1408          * Various select options
1409          *
1410          * @private
1411          *
1412          * @param $options Array: an associative array of options to be turned into
1413          *              an SQL query, valid keys are listed in the function.
1414          * @return array
1415          */
1416         function makeSelectOptions( $options ) {
1417                 $preLimitTail = $postLimitTail = '';
1418                 $startOpts = $useIndex = '';
1419
1420                 $noKeyOptions = array();
1421                 foreach ( $options as $key => $option ) {
1422                         if ( is_numeric( $key ) ) {
1423                                 $noKeyOptions[$option] = true;
1424                         }
1425                 }
1426
1427                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1428                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1429                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1430
1431                 //if (isset($options['LIMIT'])) {
1432                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1433                 //              isset($options['OFFSET']) ? $options['OFFSET']
1434                 //              : false);
1435                 //}
1436
1437                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1438                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1439                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1440
1441                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1442         }
1443
1444         function setFakeMaster( $enabled = true ) {}
1445
1446         function getDBname() {
1447                 return $this->mDBname;
1448         }
1449
1450         function getServer() {
1451                 return $this->mServer;
1452         }
1453
1454         function buildConcat( $stringList ) {
1455                 return implode( ' || ', $stringList );
1456         }
1457
1458         public function getSearchEngine() {
1459                 return "SearchPostgres";
1460         }
1461 } // end DatabasePostgres class