includes/db/DatabasePostgres.php

   1 <?php
   2 /**
   3  * @ingroup Database
   4  * @file
   5  * This is the Postgres database abstraction layer.
   6  *
   7  */
   8 class PostgresField {
   9         private $name, $tablename, $type, $nullable, $max_length, $deferred, $deferrable, $conname;
  10
  11         static function fromText($db, $table, $field) {
  12         global $wgDBmwschema;
  13
  14                 $q = <<<SQL
  15 SELECT
  16  attnotnull, attlen, COALESCE(conname, '') AS conname,
  17  COALESCE(condeferred, 'f') AS deferred,
  18  COALESCE(condeferrable, 'f') AS deferrable,
  19  CASE WHEN typname = 'int2' THEN 'smallint'
  20   WHEN typname = 'int4' THEN 'integer'
  21   WHEN typname = 'int8' THEN 'bigint'
  22   WHEN typname = 'bpchar' THEN 'char'
  23  ELSE typname END AS typname
  24 FROM pg_class c
  25 JOIN pg_namespace n ON (n.oid = c.relnamespace)
  26 JOIN pg_attribute a ON (a.attrelid = c.oid)
  27 JOIN pg_type t ON (t.oid = a.atttypid)
  28 LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
  29 WHERE relkind = 'r'
  30 AND nspname=%s
  31 AND relname=%s
  32 AND attname=%s;
  33 SQL;
  34                 $res = $db->query(sprintf($q,
  35                                 $db->addQuotes($wgDBmwschema),
  36                                 $db->addQuotes($table),
  37                                 $db->addQuotes($field)));
  38                 $row = $db->fetchObject($res);
  39                 if (!$row)
  40                         return null;
  41                 $n = new PostgresField;
  42                 $n->type = $row->typname;
  43                 $n->nullable = ($row->attnotnull == 'f');
  44                 $n->name = $field;
  45                 $n->tablename = $table;
  46                 $n->max_length = $row->attlen;
  47                 $n->deferrable = ($row->deferrable == 't');
  48                 $n->deferred = ($row->deferred == 't');
  49                 $n->conname = $row->conname;
  50                 return $n;
  51         }
  52
  53         function name() {
  54                 return $this->name;
  55         }
  56
  57         function tableName() {
  58                 return $this->tablename;
  59         }
  60
  61         function type() {
  62                 return $this->type;
  63         }
  64
  65         function nullable() {
  66                 return $this->nullable;
  67         }
  68
  69         function maxLength() {
  70                 return $this->max_length;
  71         }
  72
  73         function is_deferrable() {
  74                 return $this->deferrable;
  75         }
  76
  77         function is_deferred() {
  78                 return $this->deferred;
  79         }
  80
  81         function conname() {
  82                 return $this->conname;
  83         }
  84
  85 }
  86
  87 /**
  88  * @ingroup Database
  89  */
  90 class DatabasePostgres extends DatabaseBase {
  91         var $mInsertId = null;
  92         var $mLastResult = null;
  93         var $numeric_version = null;
  94         var $mAffectedRows = null;
  95
  96         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  97                 $failFunction = false, $flags = 0 )
  98         {
  99
 100                 $this->mFailFunction = $failFunction;
 101                 $this->mFlags = $flags;
 102                 $this->open( $server, $user, $password, $dbName);
 103
 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, $failFunction = false, $flags = 0)
 142         {
 143                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 144         }
 145
 146         /**
 147          * Usually aborts on failure
 148          * If the failFunction is set to a non-zero integer, returns success
 149          */
 150         function open( $server, $user, $password, $dbName ) {
 151                 # Test for Postgres support, to avoid suppressed fatal error
 152                 if ( !function_exists( 'pg_connect' ) ) {
 153                         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" );
 154                 }
 155
 156                 global $wgDBport;
 157
 158                 if (!strlen($user)) { ## e.g. the class is being loaded
 159                         return;
 160                 }
 161                 $this->close();
 162                 $this->mServer = $server;
 163                 $this->mPort = $port = $wgDBport;
 164                 $this->mUser = $user;
 165                 $this->mPassword = $password;
 166                 $this->mDBname = $dbName;
 167
 168                 $connectVars = array(
 169                         'dbname' => $dbName,
 170                         'user' => $user,
 171                         'password' => $password );
 172                 if ($server!=false && $server!="") {
 173                         $connectVars['host'] = $server;
 174                 }
 175                 if ($port!=false && $port!="") {
 176                         $connectVars['port'] = $port;
 177                 }
 178                 $connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
 179
 180                 $this->installErrorHandler();
 181                 $this->mConn = pg_connect( $connectString );
 182                 $phpError = $this->restoreErrorHandler();
 183
 184                 if ( !$this->mConn ) {
 185                         wfDebug( "DB connection error\n" );
 186                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 187                         wfDebug( $this->lastError()."\n" );
 188                         if ( !$this->mFailFunction ) {
 189                                 throw new DBConnectionError( $this, $phpError );
 190                         } else {
 191                                 return false;
 192                         }
 193                 }
 194
 195                 $this->mOpened = true;
 196
 197                 global $wgCommandLineMode;
 198                 ## If called from the command-line (e.g. importDump), only show errors
 199                 if ($wgCommandLineMode) {
 200                         $this->doQuery( "SET client_min_messages = 'ERROR'" );
 201                 }
 202
 203                 $this->doQuery( "SET client_encoding='UTF8'" );
 204
 205                 global $wgDBmwschema, $wgDBts2schema;
 206                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 207                         && $wgDBmwschema !== 'mediawiki'
 208                         && preg_match( '/^\w+$/', $wgDBmwschema )
 209                         && preg_match( '/^\w+$/', $wgDBts2schema )
 210                 ) {
 211                         $safeschema = $this->quote_ident($wgDBmwschema);
 212                         $safeschema2 = $this->quote_ident($wgDBts2schema);
 213                         $this->doQuery( "SET search_path = $safeschema, $wgDBts2schema, public" );
 214                 }
 215
 216                 return $this->mConn;
 217         }
 218
 219         function makeConnectionString( $vars ) {
 220                 $s = '';
 221                 foreach ( $vars as $name => $value ) {
 222                         $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
 223                 }
 224                 return $s;
 225         }
 226
 227
 228         function initial_setup($password, $dbName) {
 229                 // If this is the initial connection, setup the schema stuff and possibly create the user
 230                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
 231
 232                 print "<li>Checking the version of Postgres...";
 233                 $version = $this->getServerVersion();
 234                 $PGMINVER = '8.1';
 235                 if ($version < $PGMINVER) {
 236                         print "<b>FAILED</b>. Required version is $PGMINVER. You have " . htmlspecialchars( $version ) . "</li>\n";
 237                         dieout("</ul>");
 238                 }
 239                 print "version " . htmlspecialchars( $this->numeric_version ) . " is OK.</li>\n";
 240
 241                 $safeuser = $this->quote_ident($wgDBuser);
 242                 // Are we connecting as a superuser for the first time?
 243                 if ($wgDBsuperuser) {
 244                         // Are we really a superuser? Check out our rights
 245                         $SQL = "SELECT
 246                       CASE WHEN usesuper IS TRUE THEN
 247                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 248                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 249                     END AS rights
 250                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 251                         $rows = $this->numRows($res = $this->doQuery($SQL));
 252                         if (!$rows) {
 253                                 print "<li>ERROR: Could not read permissions for user \"" . htmlspecialchars( $wgDBsuperuser ) . "\"</li>\n";
 254                                 dieout('</ul>');
 255                         }
 256                         $perms = pg_fetch_result($res, 0, 0);
 257
 258                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 259                         $rows = $this->numRows($this->doQuery($SQL));
 260                         if ($rows) {
 261                                 print "<li>User \"" . htmlspecialchars( $wgDBuser ) . "\" already exists, skipping account creation.</li>";
 262                         }
 263                         else {
 264                                 if ($perms != 1 and $perms != 3) {
 265                                         print "<li>ERROR: the user \"" . htmlspecialchars( $wgDBsuperuser ) . "\" cannot create other users. ";
 266                                         print 'Please use a different Postgres user.</li>';
 267                                         dieout('</ul>');
 268                                 }
 269                                 print "<li>Creating user <b>" . htmlspecialchars( $wgDBuser ) . "</b>...";
 270                                 $safepass = $this->addQuotes($wgDBpassword);
 271                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 272                                 $this->doQuery($SQL);
 273                                 print "OK</li>\n";
 274                         }
 275                         // User now exists, check out the database
 276                         if ($dbName != $wgDBname) {
 277                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 278                                 $rows = $this->numRows($this->doQuery($SQL));
 279                                 if ($rows) {
 280                                         print "<li>Database \"" . htmlspecialchars( $wgDBname ) . "\" already exists, skipping database creation.</li>";
 281                                 }
 282                                 else {
 283                                         if ($perms < 1) {
 284                                                 print "<li>ERROR: the user \"" . htmlspecialchars( $wgDBsuperuser ) . "\" cannot create databases. ";
 285                                                 print 'Please use a different Postgres user.</li>';
 286                                                 dieout('</ul>');
 287                                         }
 288                                         print "<li>Creating database <b>" . htmlspecialchars( $wgDBname ) . "</b>...";
 289                                         $safename = $this->quote_ident($wgDBname);
 290                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 291                                         $this->doQuery($SQL);
 292                                         print "OK</li>\n";
 293                                         // Hopefully tsearch2 and plpgsql are in template1...
 294                                 }
 295
 296                                 // Reconnect to check out tsearch2 rights for this user
 297                                 print "<li>Connecting to \"" . htmlspecialchars( $wgDBname ) . "\" as superuser \"" .
 298                                         htmlspecialchars( $wgDBsuperuser ) . "\" to check rights...";
 299
 300                                 $connectVars = array();
 301                                 if ($this->mServer!=false && $this->mServer!="") {
 302                                         $connectVars['host'] = $this->mServer;
 303                                 }
 304                                 if ($this->mPort!=false && $this->mPort!="") {
 305                                         $connectVars['port'] = $this->mPort;
 306                                 }
 307                                 $connectVars['dbname'] = $wgDBname;
 308                                 $connectVars['user'] = $wgDBsuperuser;
 309                                 $connectVars['password'] = $password;
 310
 311                                 @$this->mConn = pg_connect( $this->makeConnectionString( $connectVars ) );
 312                                 if ( $this->mConn ) {
 313                                         print "<b>FAILED TO CONNECT!</b></li>";
 314                                         dieout("</ul>");
 315                                 }
 316                                 print "OK</li>\n";
 317                         }
 318
 319                         if ($this->numeric_version < 8.3) {
 320                                 // Tsearch2 checks
 321                                 print "<li>Checking that tsearch2 is installed in the database \"" .
 322                                         htmlspecialchars( $wgDBname ) . "\"...";
 323                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 324                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"" .
 325                                                 htmlspecialchars( $wgDBname ) . "\".";
 326                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 327                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 328                                         dieout("</ul>");
 329                                 }
 330                                 print "OK</li>\n";
 331                                 print "<li>Ensuring that user \"" . htmlspecialchars( $wgDBuser ) .
 332                                         "\" has select rights on the tsearch2 tables...";
 333                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 334                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 335                                         $this->doQuery($SQL);
 336                                 }
 337                                 print "OK</li>\n";
 338                         }
 339
 340                         // Setup the schema for this user if needed
 341                         $result = $this->schemaExists($wgDBmwschema);
 342                         $safeschema = $this->quote_ident($wgDBmwschema);
 343                         if (!$result) {
 344                                 print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
 345                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 346                                 if (!$result) {
 347                                         print "<b>FAILED</b>.</li>\n";
 348                                         dieout("</ul>");
 349                                 }
 350                                 print "OK</li>\n";
 351                         }
 352                         else {
 353                                 print "<li>Schema already exists, explicitly granting rights...\n";
 354                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 355                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 356                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 357                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 358                                         "AND p.relkind IN ('r','S','v')\n";
 359                                 $SQL .= "UNION\n";
 360                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 361                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 362                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 363                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 364                                 $res = $this->doQuery($SQL);
 365                                 if (!$res) {
 366                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 367                                         dieout("</ul>");
 368                                 }
 369                                 $this->doQuery("SET search_path = $safeschema");
 370                                 $rows = $this->numRows($res);
 371                                 while ($rows) {
 372                                         $rows--;
 373                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 374                                 }
 375                                 print "OK</li>";
 376                         }
 377
 378                         // Install plpgsql if needed
 379                         $this->setup_plpgsql();
 380
 381                         $wgDBsuperuser = '';
 382                         return true; // Reconnect as regular user
 383
 384                 } // end superuser
 385
 386                 if (!defined('POSTGRES_SEARCHPATH')) {
 387
 388                         if ($this->numeric_version < 8.3) {
 389                                 // Do we have the basic tsearch2 table?
 390                                 print "<li>Checking for tsearch2 in the schema \"" . htmlspecialchars( $wgDBts2schema ) . "\"...";
 391                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 392                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 393                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 394                                         print " for instructions.</li>\n";
 395                                         dieout("</ul>");
 396                                 }
 397                                 print "OK</li>\n";
 398
 399                                 // Does this user have the rights to the tsearch2 tables?
 400                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 401                                 print "<li>Checking tsearch2 permissions...";
 402                                 // Let's check all four, just to be safe
 403                                 error_reporting( 0 );
 404                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 405                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 406                                 foreach ( $ts2tables AS $tname ) {
 407                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 408                                         $res = $this->doQuery($SQL);
 409                                         if (!$res) {
 410                                                 print "<b>FAILED</b> to access " . htmlspecialchars( "pg_ts_$tname" ) .
 411                                                         ". Make sure that the user \"". htmlspecialchars( $wgDBuser ) .
 412                                                         "\" has SELECT access to all four tsearch2 tables</li>\n";
 413                                                 dieout("</ul>");
 414                                         }
 415                                 }
 416                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = " . $this->addQuotes( $ctype ) ;
 417                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 418                                 $res = $this->doQuery($SQL);
 419                                 error_reporting( E_ALL );
 420                                 if (!$res) {
 421                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 422                                         dieout("</ul>");
 423                                 }
 424                                 print "OK</li>";
 425
 426                                 // Will the current locale work? Can we force it to?
 427                                 print "<li>Verifying tsearch2 locale with " . htmlspecialchars( $ctype ) . "...";
 428                                 $rows = $this->numRows($res);
 429                                 $resetlocale = 0;
 430                                 if (!$rows) {
 431                                         print "<b>not found</b></li>\n";
 432                                         print "<li>Attempting to set default tsearch2 locale to \"" . htmlspecialchars( $ctype ) . "\"...";
 433                                         $resetlocale = 1;
 434                                 }
 435                                 else {
 436                                         $tsname = pg_fetch_result($res, 0, 0);
 437                                         if ($tsname != 'default') {
 438                                                 print "<b>not set to default (" . htmlspecialchars( $tsname ) . ")</b>";
 439                                                 print "<li>Attempting to change tsearch2 default locale to \"" .
 440                                                         htmlspecialchars( $ctype ) . "\"...";
 441                                                 $resetlocale = 1;
 442                                         }
 443                                 }
 444                                 if ($resetlocale) {
 445                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = " . $this->addQuotes( $ctype ) . " WHERE ts_name = 'default'";
 446                                         $res = $this->doQuery($SQL);
 447                                         if (!$res) {
 448                                                 print "<b>FAILED</b>. ";
 449                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"" .
 450                                                         htmlspecialchars( $ctype ) . "\"</li>\n";
 451                                                 dieout("</ul>");
 452                                         }
 453                                         print "OK</li>";
 454                                 }
 455
 456                                 // Final test: try out a simple tsearch2 query
 457                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 458                                 $res = $this->doQuery($SQL);
 459                                 if (!$res) {
 460                                         print "<b>FAILED</b>. Specifically, \"" . htmlspecialchars( $SQL ) . "\" did not work.</li>";
 461                                         dieout("</ul>");
 462                                 }
 463                                 print "OK</li>";
 464                         }
 465
 466                         // Install plpgsql if needed
 467                         $this->setup_plpgsql();
 468
 469                         // Does the schema already exist? Who owns it?
 470                         $result = $this->schemaExists($wgDBmwschema);
 471                         if (!$result) {
 472                                 print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
 473                                 error_reporting( 0 );
 474                                 $safeschema = $this->quote_ident($wgDBmwschema);
 475                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 476                                 error_reporting( E_ALL );
 477                                 if (!$result) {
 478                                         print "<b>FAILED</b>. The user \"" . htmlspecialchars( $wgDBuser ) .
 479                                                 "\" must be able to access the schema. ".
 480                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 481                                                 "different user, and then grant access to the \"" .
 482                                                 htmlspecialchars( $wgDBuser ) . "\" user.</li>\n";
 483                                         dieout("</ul>");
 484                                 }
 485                                 print "OK</li>\n";
 486                         }
 487                         else if ($result != $wgDBuser) {
 488                                 print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists but is not owned by \"" .
 489                                         htmlspecialchars( $wgDBuser ) . "\". Not ideal.</li>\n";
 490                         }
 491                         else {
 492                                 print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists and is owned by \"" .
 493                                         htmlspecialchars( $wgDBuser ) . "\". Excellent.</li>\n";
 494                         }
 495
 496                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 497                         print "<li>Setting the timezone to GMT for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 498                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 499                         $result = pg_query($this->mConn, $SQL);
 500                         if (!$result) {
 501                                 print "<b>FAILED</b>.</li>\n";
 502                                 dieout("</ul>");
 503                         }
 504                         print "OK</li>\n";
 505                         // Set for the rest of this session
 506                         $SQL = "SET timezone = 'GMT'";
 507                         $result = pg_query($this->mConn, $SQL);
 508                         if (!$result) {
 509                                 print "<li>Failed to set timezone</li>\n";
 510                                 dieout("</ul>");
 511                         }
 512
 513                         print "<li>Setting the datestyle to ISO, YMD for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 514                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 515                         $result = pg_query($this->mConn, $SQL);
 516                         if (!$result) {
 517                                 print "<b>FAILED</b>.</li>\n";
 518                                 dieout("</ul>");
 519                         }
 520                         print "OK</li>\n";
 521                         // Set for the rest of this session
 522                         $SQL = "SET datestyle = 'ISO, YMD'";
 523                         $result = pg_query($this->mConn, $SQL);
 524                         if (!$result) {
 525                                 print "<li>Failed to set datestyle</li>\n";
 526                                 dieout("</ul>");
 527                         }
 528
 529                         // Fix up the search paths if needed
 530                         print "<li>Setting the search path for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 531                         $path = $this->quote_ident($wgDBmwschema);
 532                         if ($wgDBts2schema !== $wgDBmwschema)
 533                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 534                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 535                                 $path .= ", public";
 536                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 537                         $result = pg_query($this->mConn, $SQL);
 538                         if (!$result) {
 539                                 print "<b>FAILED</b>.</li>\n";
 540                                 dieout("</ul>");
 541                         }
 542                         print "OK</li>\n";
 543                         // Set for the rest of this session
 544                         $SQL = "SET search_path = $path";
 545                         $result = pg_query($this->mConn, $SQL);
 546                         if (!$result) {
 547                                 print "<li>Failed to set search_path</li>\n";
 548                                 dieout("</ul>");
 549                         }
 550                         define( "POSTGRES_SEARCHPATH", $path );
 551                 }
 552         }
 553
 554
 555         function setup_plpgsql() {
 556                 print "<li>Checking for Pl/Pgsql ...";
 557                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 558                 $rows = $this->numRows($this->doQuery($SQL));
 559                 if ($rows < 1) {
 560                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 561                         print "not installed. Attempting to install Pl/Pgsql ...";
 562                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 563                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 564                         $rows = $this->numRows($this->doQuery($SQL));
 565                         if ($rows >= 1) {
 566                         $olde = error_reporting(0);
 567                                 error_reporting($olde - E_WARNING);
 568                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 569                                 error_reporting($olde);
 570                                 if (!$result) {
 571                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>" .
 572                                                 htmlspecialchars( $wgDBname ) . "</tt></li>";
 573                                         dieout("</ul>");
 574                                 }
 575                         }
 576                         else {
 577                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>" .
 578                                         htmlspecialchars( $wgDBname ) . "</tt></li>";
 579                                 dieout("</ul>");
 580                         }
 581                 }
 582                 print "OK</li>\n";
 583         }
 584
 585
 586         /**
 587          * Closes a database connection, if it is open
 588          * Returns success, true if already closed
 589          */
 590         function close() {
 591                 $this->mOpened = false;
 592                 if ( $this->mConn ) {
 593                         return pg_close( $this->mConn );
 594                 } else {
 595                         return true;
 596                 }
 597         }
 598
 599         function doQuery( $sql ) {
 600                 if (function_exists('mb_convert_encoding')) {
 601                         $sql = mb_convert_encoding($sql,'UTF-8');
 602                 }
 603                 $this->mLastResult = pg_query( $this->mConn, $sql);
 604                 $this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
 605                 return $this->mLastResult;
 606         }
 607
 608         function queryIgnore( $sql, $fname = '' ) {
 609                 return $this->query( $sql, $fname, true );
 610         }
 611
 612         function freeResult( $res ) {
 613                 if ( $res instanceof ResultWrapper ) {
 614                         $res = $res->result;
 615                 }
 616                 if ( !@pg_free_result( $res ) ) {
 617                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 618                 }
 619         }
 620
 621         function fetchObject( $res ) {
 622                 if ( $res instanceof ResultWrapper ) {
 623                         $res = $res->result;
 624                 }
 625                 @$row = pg_fetch_object( $res );
 626                 # FIXME: HACK HACK HACK HACK debug
 627
 628                 # TODO:
 629                 # hashar : not sure if the following test really trigger if the object
 630                 #          fetching failed.
 631                 if( pg_last_error($this->mConn) ) {
 632                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 633                 }
 634                 return $row;
 635         }
 636
 637         function fetchRow( $res ) {
 638                 if ( $res instanceof ResultWrapper ) {
 639                         $res = $res->result;
 640                 }
 641                 @$row = pg_fetch_array( $res );
 642                 if( pg_last_error($this->mConn) ) {
 643                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 644                 }
 645                 return $row;
 646         }
 647
 648         function numRows( $res ) {
 649                 if ( $res instanceof ResultWrapper ) {
 650                         $res = $res->result;
 651                 }
 652                 @$n = pg_num_rows( $res );
 653                 if( pg_last_error($this->mConn) ) {
 654                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 655                 }
 656                 return $n;
 657         }
 658         function numFields( $res ) {
 659                 if ( $res instanceof ResultWrapper ) {
 660                         $res = $res->result;
 661                 }
 662                 return pg_num_fields( $res );
 663         }
 664         function fieldName( $res, $n ) {
 665                 if ( $res instanceof ResultWrapper ) {
 666                         $res = $res->result;
 667                 }
 668                 return pg_field_name( $res, $n );
 669         }
 670
 671         /**
 672          * This must be called after nextSequenceVal
 673          */
 674         function insertId() {
 675                 return $this->mInsertId;
 676         }
 677
 678         function dataSeek( $res, $row ) {
 679                 if ( $res instanceof ResultWrapper ) {
 680                         $res = $res->result;
 681                 }
 682                 return pg_result_seek( $res, $row );
 683         }
 684
 685         function lastError() {
 686                 if ( $this->mConn ) {
 687                         return pg_last_error();
 688                 }
 689                 else {
 690                         return "No database connection";
 691                 }
 692         }
 693         function lastErrno() {
 694                 return pg_last_error() ? 1 : 0;
 695         }
 696
 697         function affectedRows() {
 698                 if ( !is_null( $this->mAffectedRows ) ) {
 699                         // Forced result for simulated queries
 700                         return $this->mAffectedRows;
 701                 }
 702                 if( empty( $this->mLastResult ) )
 703                         return 0;
 704                 return pg_affected_rows( $this->mLastResult );
 705         }
 706
 707         /**
 708          * Estimate rows in dataset
 709          * Returns estimated count, based on EXPLAIN output
 710          * This is not necessarily an accurate estimate, so use sparingly
 711          * Returns -1 if count cannot be found
 712          * Takes same arguments as Database::select()
 713          */
 714
 715         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
 716                 $options['EXPLAIN'] = true;
 717                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 718                 $rows = -1;
 719                 if ( $res ) {
 720                         $row = $this->fetchRow( $res );
 721                         $count = array();
 722                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 723                                 $rows = $count[1];
 724                         }
 725                         $this->freeResult($res);
 726                 }
 727                 return $rows;
 728         }
 729
 730
 731         /**
 732          * Returns information about an index
 733          * If errors are explicitly ignored, returns NULL on failure
 734          */
 735         function indexInfo( $table, $index, $fname = 'DatabasePostgres::indexInfo' ) {
 736                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 737                 $res = $this->query( $sql, $fname );
 738                 if ( !$res ) {
 739                         return null;
 740                 }
 741                 while ( $row = $this->fetchObject( $res ) ) {
 742                         if ( $row->indexname == $this->indexName( $index ) ) {
 743                                 return $row;
 744                         }
 745                 }
 746                 return false;
 747         }
 748
 749         function indexUnique ($table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
 750                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 751                         " AND indexdef LIKE 'CREATE UNIQUE%(" .
 752                         $this->strencode( $this->indexName( $index ) ) .
 753                         ")'";
 754                 $res = $this->query( $sql, $fname );
 755                 if ( !$res )
 756                         return null;
 757                 while ($row = $this->fetchObject( $res ))
 758                         return true;
 759                 return false;
 760
 761         }
 762
 763         /**
 764          * INSERT wrapper, inserts an array into a table
 765          *
 766          * $args may be a single associative array, or an array of these with numeric keys,
 767          * for multi-row insert (Postgres version 8.2 and above only).
 768          *
 769          * @param $table   String: Name of the table to insert to.
 770          * @param $args    Array: Items to insert into the table.
 771          * @param $fname   String: Name of the function, for profiling
 772          * @param $options String or Array. Valid options: IGNORE
 773          *
 774          * @return bool Success of insert operation. IGNORE always returns true.
 775          */
 776         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 777                 global $wgDBversion;
 778
 779                 if ( !count( $args ) ) {
 780                         return true;
 781                 }
 782
 783                 $table = $this->tableName( $table );
 784                 if (! isset( $wgDBversion ) ) {
 785                         $wgDBversion = $this->getServerVersion();
 786                 }
 787
 788                 if ( !is_array( $options ) )
 789                         $options = array( $options );
 790
 791                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 792                         $multi = true;
 793                         $keys = array_keys( $args[0] );
 794                 }
 795                 else {
 796                         $multi = false;
 797                         $keys = array_keys( $args );
 798                 }
 799
 800                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 801                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 802
 803                 // If we are not in a transaction, we need to be for savepoint trickery
 804                 $didbegin = 0;
 805                 if ( $ignore ) {
 806                         if (! $this->mTrxLevel) {
 807                                 $this->begin();
 808                                 $didbegin = 1;
 809                         }
 810                         $olde = error_reporting( 0 );
 811                         // For future use, we may want to track the number of actual inserts
 812                         // Right now, insert (all writes) simply return true/false
 813                         $numrowsinserted = 0;
 814                 }
 815
 816                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 817
 818                 if ( $multi ) {
 819                         if ( $wgDBversion >= 8.2 && !$ignore ) {
 820                                 $first = true;
 821                                 foreach ( $args as $row ) {
 822                                         if ( $first ) {
 823                                                 $first = false;
 824                                         } else {
 825                                                 $sql .= ',';
 826                                         }
 827                                         $sql .= '(' . $this->makeList( $row ) . ')';
 828                                 }
 829                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 830                         }
 831                         else {
 832                                 $res = true;
 833                                 $origsql = $sql;
 834                                 foreach ( $args as $row ) {
 835                                         $tempsql = $origsql;
 836                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 837
 838                                         if ( $ignore ) {
 839                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 840                                         }
 841
 842                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 843
 844                                         if ( $ignore ) {
 845                                                 $bar = pg_last_error();
 846                                                 if ($bar != false) {
 847                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 848                                                 }
 849                                                 else {
 850                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 851                                                         $numrowsinserted++;
 852                                                 }
 853                                         }
 854
 855                                         // If any of them fail, we fail overall for this function call
 856                                         // Note that this will be ignored if IGNORE is set
 857                                         if (! $tempres)
 858                                                 $res = false;
 859                                 }
 860                         }
 861                 }
 862                 else {
 863                         // Not multi, just a lone insert
 864                         if ( $ignore ) {
 865                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 866                         }
 867
 868                         $sql .= '(' . $this->makeList( $args ) . ')';
 869                         $res = (bool)$this->query( $sql, $fname, $ignore );
 870                         if ( $ignore ) {
 871                                 $bar = pg_last_error();
 872                                 if ($bar != false) {
 873                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 874                                 }
 875                                 else {
 876                                         pg_query( $this->mConn, "RELEASE $ignore" );
 877                                         $numrowsinserted++;
 878                                 }
 879                         }
 880                 }
 881                 if ( $ignore ) {
 882                         $olde = error_reporting( $olde );
 883                         if ($didbegin) {
 884                                 $this->commit();
 885                         }
 886
 887                         // Set the affected row count for the whole operation
 888                         $this->mAffectedRows = $numrowsinserted;
 889
 890                         // IGNORE always returns true
 891                         return true;
 892                 }
 893
 894
 895                 return $res;
 896
 897         }
 898
 899         /**
 900          * INSERT SELECT wrapper
 901          * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
 902          * Source items may be literals rather then field names, but strings should be quoted with Database::addQuotes()
 903          * $conds may be "*" to copy the whole table
 904          * srcTable may be an array of tables.
 905          * @todo FIXME: implement this a little better (seperate select/insert)?
 906         */
 907         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabasePostgres::insertSelect',
 908                 $insertOptions = array(), $selectOptions = array() )
 909         {
 910                 $destTable = $this->tableName( $destTable );
 911
 912                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 913                 $ignore = in_array( 'IGNORE', $insertOptions ) ? 'mw' : '';
 914
 915                 if( is_array( $insertOptions ) ) {
 916                         $insertOptions = implode( ' ', $insertOptions );
 917                 }
 918                 if( !is_array( $selectOptions ) ) {
 919                         $selectOptions = array( $selectOptions );
 920                 }
 921                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 922                 if( is_array( $srcTable ) ) {
 923                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 924                 } else {
 925                         $srcTable = $this->tableName( $srcTable );
 926                 }
 927
 928                 // If we are not in a transaction, we need to be for savepoint trickery
 929                 $didbegin = 0;
 930                 if ( $ignore ) {
 931                         if( !$this->mTrxLevel ) {
 932                                 $this->begin();
 933                                 $didbegin = 1;
 934                         }
 935                         $olde = error_reporting( 0 );
 936                         $numrowsinserted = 0;
 937                         pg_query( $this->mConn, "SAVEPOINT $ignore");
 938                 }
 939
 940                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 941                                 " SELECT $startOpts " . implode( ',', $varMap ) .
 942                                 " FROM $srcTable $useIndex";
 943
 944                 if ( $conds != '*') {
 945                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 946                 }
 947
 948                 $sql .= " $tailOpts";
 949
 950                 $res = (bool)$this->query( $sql, $fname, $ignore );
 951                 if( $ignore ) {
 952                         $bar = pg_last_error();
 953                         if( $bar != false ) {
 954                                 pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 955                         } else {
 956                                 pg_query( $this->mConn, "RELEASE $ignore" );
 957                                 $numrowsinserted++;
 958                         }
 959                         $olde = error_reporting( $olde );
 960                         if( $didbegin ) {
 961                                 $this->commit();
 962                         }
 963
 964                         // Set the affected row count for the whole operation
 965                         $this->mAffectedRows = $numrowsinserted;
 966
 967                         // IGNORE always returns true
 968                         return true;
 969                 }
 970
 971                 return $res;
 972         }
 973
 974         function tableName( $name ) {
 975                 # Replace reserved words with better ones
 976                 switch( $name ) {
 977                         case 'user':
 978                                 return 'mwuser';
 979                         case 'text':
 980                                 return 'pagecontent';
 981                         default:
 982                                 return $name;
 983                 }
 984         }
 985
 986         /**
 987          * Return the next in a sequence, save the value for retrieval via insertId()
 988          */
 989         function nextSequenceValue( $seqName ) {
 990                 $safeseq = preg_replace( "/'/", "''", $seqName );
 991                 $res = $this->query( "SELECT nextval('$safeseq')" );
 992                 $row = $this->fetchRow( $res );
 993                 $this->mInsertId = $row[0];
 994                 $this->freeResult( $res );
 995                 return $this->mInsertId;
 996         }
 997
 998         /**
 999          * Return the current value of a sequence. Assumes it has been nextval'ed in this session.
1000          */
1001         function currentSequenceValue( $seqName ) {
1002                 $safeseq = preg_replace( "/'/", "''", $seqName );
1003                 $res = $this->query( "SELECT currval('$safeseq')" );
1004                 $row = $this->fetchRow( $res );
1005                 $currval = $row[0];
1006                 $this->freeResult( $res );
1007                 return $currval;
1008         }
1009
1010         # REPLACE query wrapper
1011         # Postgres simulates this with a DELETE followed by INSERT
1012         # $row is the row to insert, an associative array
1013         # $uniqueIndexes is an array of indexes. Each element may be either a
1014         # field name or an array of field names
1015         #
1016         # It may be more efficient to leave off unique indexes which are unlikely to collide.
1017         # However if you do this, you run the risk of encountering errors which wouldn't have
1018         # occurred in MySQL
1019         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabasePostgres::replace' ) {
1020                 $table = $this->tableName( $table );
1021
1022                 if (count($rows)==0) {
1023                         return;
1024                 }
1025
1026                 # Single row case
1027                 if ( !is_array( reset( $rows ) ) ) {
1028                         $rows = array( $rows );
1029                 }
1030
1031                 foreach( $rows as $row ) {
1032                         # Delete rows which collide
1033                         if ( $uniqueIndexes ) {
1034                                 $sql = "DELETE FROM $table WHERE ";
1035                                 $first = true;
1036                                 foreach ( $uniqueIndexes as $index ) {
1037                                         if ( $first ) {
1038                                                 $first = false;
1039                                                 $sql .= "(";
1040                                         } else {
1041                                                 $sql .= ') OR (';
1042                                         }
1043                                         if ( is_array( $index ) ) {
1044                                                 $first2 = true;
1045                                                 foreach ( $index as $col ) {
1046                                                         if ( $first2 ) {
1047                                                                 $first2 = false;
1048                                                         } else {
1049                                                                 $sql .= ' AND ';
1050                                                         }
1051                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
1052                                                 }
1053                                         } else {
1054                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
1055                                         }
1056                                 }
1057                                 $sql .= ')';
1058                                 $this->query( $sql, $fname );
1059                         }
1060
1061                         # Now insert the row
1062                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
1063                                 $this->makeList( $row, LIST_COMMA ) . ')';
1064                         $this->query( $sql, $fname );
1065                 }
1066         }
1067
1068         # DELETE where the condition is a join
1069         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabasePostgres::deleteJoin' ) {
1070                 if ( !$conds ) {
1071                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
1072                 }
1073
1074                 $delTable = $this->tableName( $delTable );
1075                 $joinTable = $this->tableName( $joinTable );
1076                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
1077                 if ( $conds != '*' ) {
1078                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
1079                 }
1080                 $sql .= ')';
1081
1082                 $this->query( $sql, $fname );
1083         }
1084
1085         # Returns the size of a text field, or -1 for "unlimited"
1086         function textFieldSize( $table, $field ) {
1087                 $table = $this->tableName( $table );
1088                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
1089                         FROM pg_class c, pg_attribute a, pg_type t
1090                         WHERE relname='$table' AND a.attrelid=c.oid AND
1091                                 a.atttypid=t.oid and a.attname='$field'";
1092                 $res =$this->query($sql);
1093                 $row=$this->fetchObject($res);
1094                 if ($row->ftype=="varchar") {
1095                         $size=$row->size-4;
1096                 } else {
1097                         $size=$row->size;
1098                 }
1099                 $this->freeResult( $res );
1100                 return $size;
1101         }
1102
1103         function limitResult($sql, $limit, $offset=false) {
1104                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
1105         }
1106
1107         function wasDeadlock() {
1108                 return $this->lastErrno() == '40P01';
1109         }
1110
1111         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabasePostgres::duplicateTableStructure' ) {
1112                 return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
1113         }
1114
1115         function timestamp( $ts=0 ) {
1116                 return wfTimestamp(TS_POSTGRES,$ts);
1117         }
1118
1119         /**
1120          * Return aggregated value function call
1121          */
1122         function aggregateValue ($valuedata,$valuename='value') {
1123                 return $valuedata;
1124         }
1125
1126
1127         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1128                 // Ignore errors during error handling to avoid infinite recursion
1129                 $ignore = $this->ignoreErrors( true );
1130                 $this->mErrorCount++;
1131
1132                 if ($ignore || $tempIgnore) {
1133                         wfDebug("SQL ERROR (ignored): $error\n");
1134                         $this->ignoreErrors( $ignore );
1135                 }
1136                 else {
1137                         $message = "A database error has occurred\n" .
1138                                 "Query: $sql\n" .
1139                                 "Function: $fname\n" .
1140                                 "Error: $errno $error\n";
1141                         throw new DBUnexpectedError($this, $message);
1142                 }
1143         }
1144
1145         /**
1146          * @return string wikitext of a link to the server software's web site
1147          */
1148         function getSoftwareLink() {
1149                 return "[http://www.postgresql.org/ PostgreSQL]";
1150         }
1151
1152         /**
1153          * @return string Version information from the database
1154          */
1155         function getServerVersion() {
1156                 $versionInfo = pg_version( $this->mConn );
1157                 if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
1158                         // Old client, abort install
1159                         $this->numeric_version = '7.3 or earlier';
1160                 } elseif ( isset( $versionInfo['server'] ) ) {
1161                         // Normal client
1162                         $this->numeric_version = $versionInfo['server'];
1163                 } else {
1164                         // Bug 16937: broken pgsql extension from PHP<5.3
1165                         $this->numeric_version = pg_parameter_status( $this->mConn, 'server_version' );
1166                 }
1167                 return $this->numeric_version;
1168         }
1169
1170         /**
1171          * Query whether a given relation exists (in the given schema, or the
1172          * default mw one if not given)
1173          */
1174         function relationExists( $table, $types, $schema = false ) {
1175                 global $wgDBmwschema;
1176                 if ( !is_array( $types ) )
1177                         $types = array( $types );
1178                 if ( !$schema )
1179                         $schema = $wgDBmwschema;
1180                 $etable = $this->addQuotes( $table );
1181                 $eschema = $this->addQuotes( $schema );
1182                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1183                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1184                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1185                 $res = $this->query( $SQL );
1186                 $count = $res ? $res->numRows() : 0;
1187                 if ($res)
1188                         $this->freeResult( $res );
1189                 return $count ? true : false;
1190         }
1191
1192         /*
1193          * For backward compatibility, this function checks both tables and
1194          * views.
1195          */
1196         function tableExists( $table, $schema = false ) {
1197                 return $this->relationExists( $table, array( 'r', 'v' ), $schema );
1198         }
1199
1200         function sequenceExists( $sequence, $schema = false ) {
1201                 return $this->relationExists( $sequence, 'S', $schema );
1202         }
1203
1204         function triggerExists( $table, $trigger ) {
1205                 global $wgDBmwschema;
1206
1207                 $q = <<<SQL
1208         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1209                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1210                       AND tgrelid=pg_class.oid
1211                       AND nspname=%s AND relname=%s AND tgname=%s
1212 SQL;
1213                 $res = $this->query(sprintf($q,
1214                                 $this->addQuotes($wgDBmwschema),
1215                                 $this->addQuotes($table),
1216                                 $this->addQuotes($trigger)));
1217                 if (!$res)
1218                         return null;
1219                 $rows = $res->numRows();
1220                 $this->freeResult( $res );
1221                 return $rows;
1222         }
1223
1224         function ruleExists( $table, $rule ) {
1225                 global $wgDBmwschema;
1226                 $exists = $this->selectField("pg_rules", "rulename",
1227                                 array(  "rulename" => $rule,
1228                                         "tablename" => $table,
1229                                         "schemaname" => $wgDBmwschema ) );
1230                 return $exists === $rule;
1231         }
1232
1233         function constraintExists( $table, $constraint ) {
1234                 global $wgDBmwschema;
1235                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1236                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1237                         $this->addQuotes($wgDBmwschema),
1238                         $this->addQuotes($table),
1239                         $this->addQuotes($constraint));
1240                 $res = $this->query($SQL);
1241                 if (!$res)
1242                         return null;
1243                 $rows = $res->numRows();
1244                 $this->freeResult($res);
1245                 return $rows;
1246         }
1247
1248         /**
1249          * Query whether a given schema exists. Returns the name of the owner
1250          */
1251         function schemaExists( $schema ) {
1252                 $eschema = preg_replace("/'/", "''", $schema);
1253                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1254                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1255                 $res = $this->query( $SQL );
1256                 if ( $res && $res->numRows() ) {
1257                         $row = $res->fetchObject();
1258                         $owner = $row->rolname;
1259                 } else {
1260                         $owner = false;
1261                 }
1262                 if ($res)
1263                         $this->freeResult($res);
1264                 return $owner;
1265         }
1266
1267         /**
1268          * Query whether a given column exists in the mediawiki schema
1269          */
1270         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1271                 global $wgDBmwschema;
1272                 $etable = preg_replace("/'/", "''", $table);
1273                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1274                 $ecol = preg_replace("/'/", "''", $field);
1275                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1276                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1277                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1278                 $res = $this->query( $SQL, $fname );
1279                 $count = $res ? $res->numRows() : 0;
1280                 if ($res)
1281                         $this->freeResult( $res );
1282                 return $count;
1283         }
1284
1285         function fieldInfo( $table, $field ) {
1286                 return PostgresField::fromText($this, $table, $field);
1287         }
1288
1289         /**
1290          * pg_field_type() wrapper
1291          */
1292         function fieldType( $res, $index ) {
1293                 if ( $res instanceof ResultWrapper ) {
1294                         $res = $res->result;
1295                 }
1296                 return pg_field_type( $res, $index );
1297         }
1298
1299         function begin( $fname = 'DatabasePostgres::begin' ) {
1300                 $this->query( 'BEGIN', $fname );
1301                 $this->mTrxLevel = 1;
1302         }
1303         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1304                 return true;
1305         }
1306         function commit( $fname = 'DatabasePostgres::commit' ) {
1307                 $this->query( 'COMMIT', $fname );
1308                 $this->mTrxLevel = 0;
1309         }
1310
1311         /* Not even sure why this is used in the main codebase... */
1312         function limitResultForUpdate( $sql, $num ) {
1313                 return $sql;
1314         }
1315
1316         function setup_database() {
1317                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1318
1319                 // Make sure that we can write to the correct schema
1320                 // If not, Postgres will happily and silently go to the next search_path item
1321                 $ctest = "mediawiki_test_table";
1322                 $safeschema = $this->quote_ident($wgDBmwschema);
1323                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1324                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1325                 }
1326                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1327                 $olde = error_reporting( 0 );
1328                 $res = $this->doQuery($SQL);
1329                 error_reporting( $olde );
1330                 if (!$res) {
1331                         print "<b>FAILED</b>. Make sure that the user \"" . htmlspecialchars( $wgDBuser ) .
1332                                 "\" can write to the schema \"" . htmlspecialchars( $wgDBmwschema ) . "\"</li>\n";
1333                         dieout(""); # Will close the main list <ul> and finish the page.
1334                 }
1335                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1336
1337                 $res = $this->sourceFile( "../maintenance/postgres/tables.sql" );
1338                 if ($res === true) {
1339                         print " done.</li>\n";
1340                 } else {
1341                         print " <b>FAILED</b></li>\n";
1342                         dieout( htmlspecialchars( $res ) );
1343                 }
1344
1345                 ## Update version information
1346                 $mwv = $this->addQuotes($wgVersion);
1347                 $pgv = $this->addQuotes($this->getServerVersion());
1348                 $pgu = $this->addQuotes($this->mUser);
1349                 $mws = $this->addQuotes($wgDBmwschema);
1350                 $tss = $this->addQuotes($wgDBts2schema);
1351                 $pgp = $this->addQuotes($wgDBport);
1352                 $dbn = $this->addQuotes($this->mDBname);
1353                 $ctype = $this->addQuotes( pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0) );
1354
1355                 echo "<li>Populating interwiki table... ";
1356                 ## Avoid the non-standard "REPLACE INTO" syntax
1357                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1358                 if ( !$f ) {
1359                         print "<b>FAILED</b></li>";
1360                         dieout( "Could not find the interwiki.sql file" );
1361                 }
1362                 ## We simply assume it is already empty as we have just created it
1363                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1364                 while ( ! feof( $f ) ) {
1365                         $line = fgets($f,1024);
1366                         $matches = array();
1367                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1368                                 continue;
1369                         }
1370                         $this->query("$SQL $matches[1],$matches[2])");
1371                 }
1372                 print " successfully populated.</li>\n";
1373
1374                 $this->doQuery("COMMIT");
1375         }
1376
1377         function encodeBlob( $b ) {
1378                 return new Blob ( pg_escape_bytea( $b ) ) ;
1379         }
1380
1381         function decodeBlob( $b ) {
1382                 if ($b instanceof Blob) {
1383                         $b = $b->fetch();
1384                 }
1385                 return pg_unescape_bytea( $b );
1386         }
1387
1388         function strencode( $s ) { ## Should not be called by us
1389                 return pg_escape_string( $s );
1390         }
1391
1392         function addQuotes( $s ) {
1393                 if ( is_null( $s ) ) {
1394                         return 'NULL';
1395                 } else if ( is_bool( $s ) ) {
1396                         return intval( $s );
1397                 } else if ($s instanceof Blob) {
1398                         return "'".$s->fetch($s)."'";
1399                 }
1400                 return "'" . pg_escape_string($s) . "'";
1401         }
1402
1403         function quote_ident( $s ) {
1404                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1405         }
1406
1407         /**
1408          * Postgres specific version of replaceVars.
1409          * Calls the parent version in Database.php
1410          *
1411          * @private
1412          *
1413          * @param $ins String: SQL string, read from a stream (usually tables.sql)
1414          *
1415          * @return string SQL string
1416          */
1417         protected function replaceVars( $ins ) {
1418
1419                 $ins = parent::replaceVars( $ins );
1420
1421                 if ($this->numeric_version >= 8.3) {
1422                         // Thanks for not providing backwards-compatibility, 8.3
1423                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1424                 }
1425
1426                 if ($this->numeric_version <= 8.1) { // Our minimum version
1427                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1428                 }
1429
1430                 return $ins;
1431         }
1432
1433         /**
1434          * Various select options
1435          *
1436          * @private
1437          *
1438          * @param $options Array: an associative array of options to be turned into
1439          *              an SQL query, valid keys are listed in the function.
1440          * @return array
1441          */
1442         function makeSelectOptions( $options ) {
1443                 $preLimitTail = $postLimitTail = '';
1444                 $startOpts = $useIndex = '';
1445
1446                 $noKeyOptions = array();
1447                 foreach ( $options as $key => $option ) {
1448                         if ( is_numeric( $key ) ) {
1449                                 $noKeyOptions[$option] = true;
1450                         }
1451                 }
1452
1453                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1454                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1455                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1456
1457                 //if (isset($options['LIMIT'])) {
1458                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1459                 //              isset($options['OFFSET']) ? $options['OFFSET']
1460                 //              : false);
1461                 //}
1462
1463                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1464                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1465                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1466
1467                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1468         }
1469
1470         /**
1471          * How lagged is this slave?
1472          *
1473          */
1474         public function getLag() {
1475                 # Not implemented for PostgreSQL
1476                 return false;
1477         }
1478
1479         function setFakeSlaveLag( $lag ) {}
1480         function setFakeMaster( $enabled = true ) {}
1481
1482         function getDBname() {
1483                 return $this->mDBname;
1484         }
1485
1486         function getServer() {
1487                 return $this->mServer;
1488         }
1489
1490         function buildConcat( $stringList ) {
1491                 return implode( ' || ', $stringList );
1492         }
1493
1494         public function getSearchEngine() {
1495                 return "SearchPostgres";
1496         }
1497 } // end DatabasePostgres class