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
  35                 $table = $db->tableName( $table );
  36                 $res = $db->query(sprintf($q,
  37                                 $db->addQuotes($wgDBmwschema),
  38                                 $db->addQuotes($table),
  39                                 $db->addQuotes($field)));
  40                 $row = $db->fetchObject($res);
  41                 if (!$row)
  42                         return null;
  43                 $n = new PostgresField;
  44                 $n->type = $row->typname;
  45                 $n->nullable = ($row->attnotnull == 'f');
  46                 $n->name = $field;
  47                 $n->tablename = $table;
  48                 $n->max_length = $row->attlen;
  49                 $n->deferrable = ($row->deferrable == 't');
  50                 $n->deferred = ($row->deferred == 't');
  51                 $n->conname = $row->conname;
  52                 return $n;
  53         }
  54
  55         function name() {
  56                 return $this->name;
  57         }
  58
  59         function tableName() {
  60                 return $this->tablename;
  61         }
  62
  63         function type() {
  64                 return $this->type;
  65         }
  66
  67         function nullable() {
  68                 return $this->nullable;
  69         }
  70
  71         function maxLength() {
  72                 return $this->max_length;
  73         }
  74
  75         function is_deferrable() {
  76                 return $this->deferrable;
  77         }
  78
  79         function is_deferred() {
  80                 return $this->deferred;
  81         }
  82
  83         function conname() {
  84                 return $this->conname;
  85         }
  86
  87 }
  88
  89 /**
  90  * @ingroup Database
  91  */
  92 class DatabasePostgres extends DatabaseBase {
  93         var $mInsertId = null;
  94         var $mLastResult = null;
  95         var $numeric_version = null;
  96         var $mAffectedRows = null;
  97
  98         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  99                 $failFunction = false, $flags = 0 )
 100         {
 101
 102                 $this->mFailFunction = $failFunction;
 103                 $this->mFlags = $flags;
 104                 $this->open( $server, $user, $password, $dbName);
 105
 106         }
 107
 108         function getType() {
 109                 return 'postgres';
 110         }
 111
 112         function cascadingDeletes() {
 113                 return true;
 114         }
 115         function cleanupTriggers() {
 116                 return true;
 117         }
 118         function strictIPs() {
 119                 return true;
 120         }
 121         function realTimestamps() {
 122                 return true;
 123         }
 124         function implicitGroupby() {
 125                 return false;
 126         }
 127         function implicitOrderby() {
 128                 return false;
 129         }
 130         function searchableIPs() {
 131                 return true;
 132         }
 133         function functionalIndexes() {
 134                 return true;
 135         }
 136
 137         function hasConstraint( $name ) {
 138                 global $wgDBmwschema;
 139                 $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) ."'";
 140                 return $this->numRows($res = $this->doQuery($SQL));
 141         }
 142
 143         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 144         {
 145                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 146         }
 147
 148         /**
 149          * Usually aborts on failure
 150          * If the failFunction is set to a non-zero integer, returns success
 151          */
 152         function open( $server, $user, $password, $dbName ) {
 153                 # Test for Postgres support, to avoid suppressed fatal error
 154                 if ( !function_exists( 'pg_connect' ) ) {
 155                         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" );
 156                 }
 157
 158                 global $wgDBport;
 159
 160                 if (!strlen($user)) { ## e.g. the class is being loaded
 161                         return;
 162                 }
 163                 $this->close();
 164                 $this->mServer = $server;
 165                 $this->mPort = $port = $wgDBport;
 166                 $this->mUser = $user;
 167                 $this->mPassword = $password;
 168                 $this->mDBname = $dbName;
 169
 170                 $connectVars = array(
 171                         'dbname' => $dbName,
 172                         'user' => $user,
 173                         'password' => $password );
 174                 if ($server!=false && $server!="") {
 175                         $connectVars['host'] = $server;
 176                 }
 177                 if ($port!=false && $port!="") {
 178                         $connectVars['port'] = $port;
 179                 }
 180                 $connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
 181
 182                 $this->installErrorHandler();
 183                 $this->mConn = pg_connect( $connectString );
 184                 $phpError = $this->restoreErrorHandler();
 185
 186                 if ( !$this->mConn ) {
 187                         wfDebug( "DB connection error\n" );
 188                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 189                         wfDebug( $this->lastError()."\n" );
 190                         if ( !$this->mFailFunction ) {
 191                                 throw new DBConnectionError( $this, $phpError );
 192                         } else {
 193                                 return false;
 194                         }
 195                 }
 196
 197                 $this->mOpened = true;
 198
 199                 global $wgCommandLineMode;
 200                 ## If called from the command-line (e.g. importDump), only show errors
 201                 if ($wgCommandLineMode) {
 202                         $this->doQuery( "SET client_min_messages = 'ERROR'" );
 203                 }
 204
 205                 $this->doQuery( "SET client_encoding='UTF8'" );
 206
 207                 global $wgDBmwschema, $wgDBts2schema;
 208                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 209                         && $wgDBmwschema !== 'mediawiki'
 210                         && preg_match( '/^\w+$/', $wgDBmwschema )
 211                         && preg_match( '/^\w+$/', $wgDBts2schema )
 212                 ) {
 213                         $safeschema = $this->quote_ident($wgDBmwschema);
 214                         $safeschema2 = $this->quote_ident($wgDBts2schema);
 215                         $this->doQuery( "SET search_path = $safeschema, $wgDBts2schema, public" );
 216                 }
 217
 218                 return $this->mConn;
 219         }
 220
 221         function makeConnectionString( $vars ) {
 222                 $s = '';
 223                 foreach ( $vars as $name => $value ) {
 224                         $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
 225                 }
 226                 return $s;
 227         }
 228
 229
 230         function initial_setup($password, $dbName) {
 231                 // If this is the initial connection, setup the schema stuff and possibly create the user
 232                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
 233
 234                 print "<li>Checking the version of Postgres...";
 235                 $version = $this->getServerVersion();
 236                 $PGMINVER = '8.1';
 237                 if ($version < $PGMINVER) {
 238                         print "<b>FAILED</b>. Required version is $PGMINVER. You have " . htmlspecialchars( $version ) . "</li>\n";
 239                         dieout("</ul>");
 240                 }
 241                 print "version " . htmlspecialchars( $this->numeric_version ) . " is OK.</li>\n";
 242
 243                 $safeuser = $this->quote_ident($wgDBuser);
 244                 // Are we connecting as a superuser for the first time?
 245                 if ($wgDBsuperuser) {
 246                         // Are we really a superuser? Check out our rights
 247                         $SQL = "SELECT
 248                       CASE WHEN usesuper IS TRUE THEN
 249                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 250                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 251                     END AS rights
 252                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 253                         $rows = $this->numRows($res = $this->doQuery($SQL));
 254                         if (!$rows) {
 255                                 print "<li>ERROR: Could not read permissions for user \"" . htmlspecialchars( $wgDBsuperuser ) . "\"</li>\n";
 256                                 dieout('</ul>');
 257                         }
 258                         $perms = pg_fetch_result($res, 0, 0);
 259
 260                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 261                         $rows = $this->numRows($this->doQuery($SQL));
 262                         if ($rows) {
 263                                 print "<li>User \"" . htmlspecialchars( $wgDBuser ) . "\" already exists, skipping account creation.</li>";
 264                         }
 265                         else {
 266                                 if ($perms != 1 and $perms != 3) {
 267                                         print "<li>ERROR: the user \"" . htmlspecialchars( $wgDBsuperuser ) . "\" cannot create other users. ";
 268                                         print 'Please use a different Postgres user.</li>';
 269                                         dieout('</ul>');
 270                                 }
 271                                 print "<li>Creating user <b>" . htmlspecialchars( $wgDBuser ) . "</b>...";
 272                                 $safepass = $this->addQuotes($wgDBpassword);
 273                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 274                                 $this->doQuery($SQL);
 275                                 print "OK</li>\n";
 276                         }
 277                         // User now exists, check out the database
 278                         if ($dbName != $wgDBname) {
 279                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 280                                 $rows = $this->numRows($this->doQuery($SQL));
 281                                 if ($rows) {
 282                                         print "<li>Database \"" . htmlspecialchars( $wgDBname ) . "\" already exists, skipping database creation.</li>";
 283                                 }
 284                                 else {
 285                                         if ($perms < 1) {
 286                                                 print "<li>ERROR: the user \"" . htmlspecialchars( $wgDBsuperuser ) . "\" cannot create databases. ";
 287                                                 print 'Please use a different Postgres user.</li>';
 288                                                 dieout('</ul>');
 289                                         }
 290                                         print "<li>Creating database <b>" . htmlspecialchars( $wgDBname ) . "</b>...";
 291                                         $safename = $this->quote_ident($wgDBname);
 292                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 293                                         $this->doQuery($SQL);
 294                                         print "OK</li>\n";
 295                                         // Hopefully tsearch2 and plpgsql are in template1...
 296                                 }
 297
 298                                 // Reconnect to check out tsearch2 rights for this user
 299                                 print "<li>Connecting to \"" . htmlspecialchars( $wgDBname ) . "\" as superuser \"" .
 300                                         htmlspecialchars( $wgDBsuperuser ) . "\" to check rights...";
 301
 302                                 $connectVars = array();
 303                                 if ($this->mServer!=false && $this->mServer!="") {
 304                                         $connectVars['host'] = $this->mServer;
 305                                 }
 306                                 if ($this->mPort!=false && $this->mPort!="") {
 307                                         $connectVars['port'] = $this->mPort;
 308                                 }
 309                                 $connectVars['dbname'] = $wgDBname;
 310                                 $connectVars['user'] = $wgDBsuperuser;
 311                                 $connectVars['password'] = $password;
 312
 313                                 @$this->mConn = pg_connect( $this->makeConnectionString( $connectVars ) );
 314                                 if ( !$this->mConn ) {
 315                                         print "<b>FAILED TO CONNECT!</b></li>";
 316                                         dieout("</ul>");
 317                                 }
 318                                 print "OK</li>\n";
 319                         }
 320
 321                         if ($this->numeric_version < 8.3) {
 322                                 // Tsearch2 checks
 323                                 print "<li>Checking that tsearch2 is installed in the database \"" .
 324                                         htmlspecialchars( $wgDBname ) . "\"...";
 325                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 326                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"" .
 327                                                 htmlspecialchars( $wgDBname ) . "\".";
 328                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 329                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 330                                         dieout("</ul>");
 331                                 }
 332                                 print "OK</li>\n";
 333                                 print "<li>Ensuring that user \"" . htmlspecialchars( $wgDBuser ) .
 334                                         "\" has select rights on the tsearch2 tables...";
 335                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 336                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 337                                         $this->doQuery($SQL);
 338                                 }
 339                                 print "OK</li>\n";
 340                         }
 341
 342                         // Setup the schema for this user if needed
 343                         $result = $this->schemaExists($wgDBmwschema);
 344                         $safeschema = $this->quote_ident($wgDBmwschema);
 345                         if (!$result) {
 346                                 print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
 347                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 348                                 if (!$result) {
 349                                         print "<b>FAILED</b>.</li>\n";
 350                                         dieout("</ul>");
 351                                 }
 352                                 print "OK</li>\n";
 353                         }
 354                         else {
 355                                 print "<li>Schema already exists, explicitly granting rights...\n";
 356                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 357                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 358                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 359                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 360                                         "AND p.relkind IN ('r','S','v')\n";
 361                                 $SQL .= "UNION\n";
 362                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 363                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 364                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 365                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 366                                 $res = $this->doQuery($SQL);
 367                                 if (!$res) {
 368                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 369                                         dieout("</ul>");
 370                                 }
 371                                 $this->doQuery("SET search_path = $safeschema");
 372                                 $rows = $this->numRows($res);
 373                                 while ($rows) {
 374                                         $rows--;
 375                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 376                                 }
 377                                 print "OK</li>";
 378                         }
 379
 380                         // Install plpgsql if needed
 381                         $this->setup_plpgsql();
 382
 383                         $wgDBsuperuser = '';
 384                         return true; // Reconnect as regular user
 385
 386                 } // end superuser
 387
 388                 if (!defined('POSTGRES_SEARCHPATH')) {
 389
 390                         if ($this->numeric_version < 8.3) {
 391                                 // Do we have the basic tsearch2 table?
 392                                 print "<li>Checking for tsearch2 in the schema \"" . htmlspecialchars( $wgDBts2schema ) . "\"...";
 393                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 394                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 395                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 396                                         print " for instructions.</li>\n";
 397                                         dieout("</ul>");
 398                                 }
 399                                 print "OK</li>\n";
 400
 401                                 // Does this user have the rights to the tsearch2 tables?
 402                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 403                                 print "<li>Checking tsearch2 permissions...";
 404                                 // Let's check all four, just to be safe
 405                                 error_reporting( 0 );
 406                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 407                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 408                                 foreach ( $ts2tables AS $tname ) {
 409                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 410                                         $res = $this->doQuery($SQL);
 411                                         if (!$res) {
 412                                                 print "<b>FAILED</b> to access " . htmlspecialchars( "pg_ts_$tname" ) .
 413                                                         ". Make sure that the user \"". htmlspecialchars( $wgDBuser ) .
 414                                                         "\" has SELECT access to all four tsearch2 tables</li>\n";
 415                                                 dieout("</ul>");
 416                                         }
 417                                 }
 418                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = " . $this->addQuotes( $ctype ) ;
 419                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 420                                 $res = $this->doQuery($SQL);
 421                                 error_reporting( E_ALL );
 422                                 if (!$res) {
 423                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 424                                         dieout("</ul>");
 425                                 }
 426                                 print "OK</li>";
 427
 428                                 // Will the current locale work? Can we force it to?
 429                                 print "<li>Verifying tsearch2 locale with " . htmlspecialchars( $ctype ) . "...";
 430                                 $rows = $this->numRows($res);
 431                                 $resetlocale = 0;
 432                                 if (!$rows) {
 433                                         print "<b>not found</b></li>\n";
 434                                         print "<li>Attempting to set default tsearch2 locale to \"" . htmlspecialchars( $ctype ) . "\"...";
 435                                         $resetlocale = 1;
 436                                 }
 437                                 else {
 438                                         $tsname = pg_fetch_result($res, 0, 0);
 439                                         if ($tsname != 'default') {
 440                                                 print "<b>not set to default (" . htmlspecialchars( $tsname ) . ")</b>";
 441                                                 print "<li>Attempting to change tsearch2 default locale to \"" .
 442                                                         htmlspecialchars( $ctype ) . "\"...";
 443                                                 $resetlocale = 1;
 444                                         }
 445                                 }
 446                                 if ($resetlocale) {
 447                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = " . $this->addQuotes( $ctype ) . " WHERE ts_name = 'default'";
 448                                         $res = $this->doQuery($SQL);
 449                                         if (!$res) {
 450                                                 print "<b>FAILED</b>. ";
 451                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"" .
 452                                                         htmlspecialchars( $ctype ) . "\"</li>\n";
 453                                                 dieout("</ul>");
 454                                         }
 455                                         print "OK</li>";
 456                                 }
 457
 458                                 // Final test: try out a simple tsearch2 query
 459                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 460                                 $res = $this->doQuery($SQL);
 461                                 if (!$res) {
 462                                         print "<b>FAILED</b>. Specifically, \"" . htmlspecialchars( $SQL ) . "\" did not work.</li>";
 463                                         dieout("</ul>");
 464                                 }
 465                                 print "OK</li>";
 466                         }
 467
 468                         // Install plpgsql if needed
 469                         $this->setup_plpgsql();
 470
 471                         // Does the schema already exist? Who owns it?
 472                         $result = $this->schemaExists($wgDBmwschema);
 473                         if (!$result) {
 474                                 print "<li>Creating schema <b>" . htmlspecialchars( $wgDBmwschema ) . "</b> ...";
 475                                 error_reporting( 0 );
 476                                 $safeschema = $this->quote_ident($wgDBmwschema);
 477                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 478                                 error_reporting( E_ALL );
 479                                 if (!$result) {
 480                                         print "<b>FAILED</b>. The user \"" . htmlspecialchars( $wgDBuser ) .
 481                                                 "\" must be able to access the schema. ".
 482                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 483                                                 "different user, and then grant access to the \"" .
 484                                                 htmlspecialchars( $wgDBuser ) . "\" user.</li>\n";
 485                                         dieout("</ul>");
 486                                 }
 487                                 print "OK</li>\n";
 488                         }
 489                         else if ($result != $wgDBuser) {
 490                                 print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists but is not owned by \"" .
 491                                         htmlspecialchars( $wgDBuser ) . "\". Not ideal.</li>\n";
 492                         }
 493                         else {
 494                                 print "<li>Schema \"" . htmlspecialchars( $wgDBmwschema ) . "\" exists and is owned by \"" .
 495                                         htmlspecialchars( $wgDBuser ) . "\". Excellent.</li>\n";
 496                         }
 497
 498                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 499                         print "<li>Setting the timezone to GMT for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 500                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 501                         $result = pg_query($this->mConn, $SQL);
 502                         if (!$result) {
 503                                 print "<b>FAILED</b>.</li>\n";
 504                                 dieout("</ul>");
 505                         }
 506                         print "OK</li>\n";
 507                         // Set for the rest of this session
 508                         $SQL = "SET timezone = 'GMT'";
 509                         $result = pg_query($this->mConn, $SQL);
 510                         if (!$result) {
 511                                 print "<li>Failed to set timezone</li>\n";
 512                                 dieout("</ul>");
 513                         }
 514
 515                         print "<li>Setting the datestyle to ISO, YMD for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 516                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 517                         $result = pg_query($this->mConn, $SQL);
 518                         if (!$result) {
 519                                 print "<b>FAILED</b>.</li>\n";
 520                                 dieout("</ul>");
 521                         }
 522                         print "OK</li>\n";
 523                         // Set for the rest of this session
 524                         $SQL = "SET datestyle = 'ISO, YMD'";
 525                         $result = pg_query($this->mConn, $SQL);
 526                         if (!$result) {
 527                                 print "<li>Failed to set datestyle</li>\n";
 528                                 dieout("</ul>");
 529                         }
 530
 531                         // Fix up the search paths if needed
 532                         print "<li>Setting the search path for user \"" . htmlspecialchars( $wgDBuser ) . "\" ...";
 533                         $path = $this->quote_ident($wgDBmwschema);
 534                         if ($wgDBts2schema !== $wgDBmwschema)
 535                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 536                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 537                                 $path .= ", public";
 538                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 539                         $result = pg_query($this->mConn, $SQL);
 540                         if (!$result) {
 541                                 print "<b>FAILED</b>.</li>\n";
 542                                 dieout("</ul>");
 543                         }
 544                         print "OK</li>\n";
 545                         // Set for the rest of this session
 546                         $SQL = "SET search_path = $path";
 547                         $result = pg_query($this->mConn, $SQL);
 548                         if (!$result) {
 549                                 print "<li>Failed to set search_path</li>\n";
 550                                 dieout("</ul>");
 551                         }
 552                         define( "POSTGRES_SEARCHPATH", $path );
 553                 }
 554         }
 555
 556
 557         function setup_plpgsql() {
 558                 print "<li>Checking for Pl/Pgsql ...";
 559                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 560                 $rows = $this->numRows($this->doQuery($SQL));
 561                 if ($rows < 1) {
 562                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 563                         print "not installed. Attempting to install Pl/Pgsql ...";
 564                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 565                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 566                         $rows = $this->numRows($this->doQuery($SQL));
 567                         global $wgDBname;
 568                         if ($rows >= 1) {
 569                                 $olde = error_reporting(0);
 570                                 error_reporting($olde - E_WARNING);
 571                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 572                                 error_reporting($olde);
 573                                 if (!$result) {
 574                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>" .
 575                                                 htmlspecialchars( $wgDBname ) . "</tt></li>";
 576                                         dieout("</ul>");
 577                                 }
 578                         }
 579                         else {
 580                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>" .
 581                                         htmlspecialchars( $wgDBname ) . "</tt></li>";
 582                                 dieout("</ul>");
 583                         }
 584                 }
 585                 print "OK</li>\n";
 586         }
 587
 588
 589         /**
 590          * Closes a database connection, if it is open
 591          * Returns success, true if already closed
 592          */
 593         function close() {
 594                 $this->mOpened = false;
 595                 if ( $this->mConn ) {
 596                         return pg_close( $this->mConn );
 597                 } else {
 598                         return true;
 599                 }
 600         }
 601
 602         function doQuery( $sql ) {
 603                 if (function_exists('mb_convert_encoding')) {
 604                         $sql = mb_convert_encoding($sql,'UTF-8');
 605                 }
 606                 $this->mLastResult = pg_query( $this->mConn, $sql);
 607                 $this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
 608                 return $this->mLastResult;
 609         }
 610
 611         function queryIgnore( $sql, $fname = '' ) {
 612                 return $this->query( $sql, $fname, true );
 613         }
 614
 615         function freeResult( $res ) {
 616                 if ( $res instanceof ResultWrapper ) {
 617                         $res = $res->result;
 618                 }
 619                 if ( !@pg_free_result( $res ) ) {
 620                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 621                 }
 622         }
 623
 624         function fetchObject( $res ) {
 625                 if ( $res instanceof ResultWrapper ) {
 626                         $res = $res->result;
 627                 }
 628                 @$row = pg_fetch_object( $res );
 629                 # FIXME: HACK HACK HACK HACK debug
 630
 631                 # TODO:
 632                 # hashar : not sure if the following test really trigger if the object
 633                 #          fetching failed.
 634                 if( pg_last_error($this->mConn) ) {
 635                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 636                 }
 637                 return $row;
 638         }
 639
 640         function fetchRow( $res ) {
 641                 if ( $res instanceof ResultWrapper ) {
 642                         $res = $res->result;
 643                 }
 644                 @$row = pg_fetch_array( $res );
 645                 if( pg_last_error($this->mConn) ) {
 646                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 647                 }
 648                 return $row;
 649         }
 650
 651         function numRows( $res ) {
 652                 if ( $res instanceof ResultWrapper ) {
 653                         $res = $res->result;
 654                 }
 655                 @$n = pg_num_rows( $res );
 656                 if( pg_last_error($this->mConn) ) {
 657                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 658                 }
 659                 return $n;
 660         }
 661         function numFields( $res ) {
 662                 if ( $res instanceof ResultWrapper ) {
 663                         $res = $res->result;
 664                 }
 665                 return pg_num_fields( $res );
 666         }
 667         function fieldName( $res, $n ) {
 668                 if ( $res instanceof ResultWrapper ) {
 669                         $res = $res->result;
 670                 }
 671                 return pg_field_name( $res, $n );
 672         }
 673
 674         /**
 675          * This must be called after nextSequenceVal
 676          */
 677         function insertId() {
 678                 return $this->mInsertId;
 679         }
 680
 681         function dataSeek( $res, $row ) {
 682                 if ( $res instanceof ResultWrapper ) {
 683                         $res = $res->result;
 684                 }
 685                 return pg_result_seek( $res, $row );
 686         }
 687
 688         function lastError() {
 689                 if ( $this->mConn ) {
 690                         return pg_last_error();
 691                 }
 692                 else {
 693                         return "No database connection";
 694                 }
 695         }
 696         function lastErrno() {
 697                 return pg_last_error() ? 1 : 0;
 698         }
 699
 700         function affectedRows() {
 701                 if ( !is_null( $this->mAffectedRows ) ) {
 702                         // Forced result for simulated queries
 703                         return $this->mAffectedRows;
 704                 }
 705                 if( empty( $this->mLastResult ) )
 706                         return 0;
 707                 return pg_affected_rows( $this->mLastResult );
 708         }
 709
 710         /**
 711          * Estimate rows in dataset
 712          * Returns estimated count, based on EXPLAIN output
 713          * This is not necessarily an accurate estimate, so use sparingly
 714          * Returns -1 if count cannot be found
 715          * Takes same arguments as Database::select()
 716          */
 717
 718         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
 719                 $options['EXPLAIN'] = true;
 720                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 721                 $rows = -1;
 722                 if ( $res ) {
 723                         $row = $this->fetchRow( $res );
 724                         $count = array();
 725                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 726                                 $rows = $count[1];
 727                         }
 728                         $this->freeResult($res);
 729                 }
 730                 return $rows;
 731         }
 732
 733
 734         /**
 735          * Returns information about an index
 736          * If errors are explicitly ignored, returns NULL on failure
 737          */
 738         function indexInfo( $table, $index, $fname = 'DatabasePostgres::indexInfo' ) {
 739                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 740                 $res = $this->query( $sql, $fname );
 741                 if ( !$res ) {
 742                         return null;
 743                 }
 744                 while ( $row = $this->fetchObject( $res ) ) {
 745                         if ( $row->indexname == $this->indexName( $index ) ) {
 746                                 return $row;
 747                         }
 748                 }
 749                 return false;
 750         }
 751
 752         function indexUnique ($table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
 753                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 754                         " AND indexdef LIKE 'CREATE UNIQUE%(" .
 755                         $this->strencode( $this->indexName( $index ) ) .
 756                         ")'";
 757                 $res = $this->query( $sql, $fname );
 758                 if ( !$res )
 759                         return null;
 760                 while ($row = $this->fetchObject( $res ))
 761                         return true;
 762                 return false;
 763
 764         }
 765
 766         /**
 767          * INSERT wrapper, inserts an array into a table
 768          *
 769          * $args may be a single associative array, or an array of these with numeric keys,
 770          * for multi-row insert (Postgres version 8.2 and above only).
 771          *
 772          * @param $table   String: Name of the table to insert to.
 773          * @param $args    Array: Items to insert into the table.
 774          * @param $fname   String: Name of the function, for profiling
 775          * @param $options String or Array. Valid options: IGNORE
 776          *
 777          * @return bool Success of insert operation. IGNORE always returns true.
 778          */
 779         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 780                 global $wgDBversion;
 781
 782                 if ( !count( $args ) ) {
 783                         return true;
 784                 }
 785
 786                 $table = $this->tableName( $table );
 787                 if (! isset( $wgDBversion ) ) {
 788                         $wgDBversion = $this->getServerVersion();
 789                 }
 790
 791                 if ( !is_array( $options ) )
 792                         $options = array( $options );
 793
 794                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 795                         $multi = true;
 796                         $keys = array_keys( $args[0] );
 797                 }
 798                 else {
 799                         $multi = false;
 800                         $keys = array_keys( $args );
 801                 }
 802
 803                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 804                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 805
 806                 // If we are not in a transaction, we need to be for savepoint trickery
 807                 $didbegin = 0;
 808                 if ( $ignore ) {
 809                         if (! $this->mTrxLevel) {
 810                                 $this->begin();
 811                                 $didbegin = 1;
 812                         }
 813                         $olde = error_reporting( 0 );
 814                         // For future use, we may want to track the number of actual inserts
 815                         // Right now, insert (all writes) simply return true/false
 816                         $numrowsinserted = 0;
 817                 }
 818
 819                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 820
 821                 if ( $multi ) {
 822                         if ( $wgDBversion >= 8.2 && !$ignore ) {
 823                                 $first = true;
 824                                 foreach ( $args as $row ) {
 825                                         if ( $first ) {
 826                                                 $first = false;
 827                                         } else {
 828                                                 $sql .= ',';
 829                                         }
 830                                         $sql .= '(' . $this->makeList( $row ) . ')';
 831                                 }
 832                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 833                         }
 834                         else {
 835                                 $res = true;
 836                                 $origsql = $sql;
 837                                 foreach ( $args as $row ) {
 838                                         $tempsql = $origsql;
 839                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 840
 841                                         if ( $ignore ) {
 842                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 843                                         }
 844
 845                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 846
 847                                         if ( $ignore ) {
 848                                                 $bar = pg_last_error();
 849                                                 if ($bar != false) {
 850                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 851                                                 }
 852                                                 else {
 853                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 854                                                         $numrowsinserted++;
 855                                                 }
 856                                         }
 857
 858                                         // If any of them fail, we fail overall for this function call
 859                                         // Note that this will be ignored if IGNORE is set
 860                                         if (! $tempres)
 861                                                 $res = false;
 862                                 }
 863                         }
 864                 }
 865                 else {
 866                         // Not multi, just a lone insert
 867                         if ( $ignore ) {
 868                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 869                         }
 870
 871                         $sql .= '(' . $this->makeList( $args ) . ')';
 872                         $res = (bool)$this->query( $sql, $fname, $ignore );
 873                         if ( $ignore ) {
 874                                 $bar = pg_last_error();
 875                                 if ($bar != false) {
 876                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 877                                 }
 878                                 else {
 879                                         pg_query( $this->mConn, "RELEASE $ignore" );
 880                                         $numrowsinserted++;
 881                                 }
 882                         }
 883                 }
 884                 if ( $ignore ) {
 885                         $olde = error_reporting( $olde );
 886                         if ($didbegin) {
 887                                 $this->commit();
 888                         }
 889
 890                         // Set the affected row count for the whole operation
 891                         $this->mAffectedRows = $numrowsinserted;
 892
 893                         // IGNORE always returns true
 894                         return true;
 895                 }
 896
 897
 898                 return $res;
 899
 900         }
 901
 902         /**
 903          * INSERT SELECT wrapper
 904          * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
 905          * Source items may be literals rather then field names, but strings should be quoted with Database::addQuotes()
 906          * $conds may be "*" to copy the whole table
 907          * srcTable may be an array of tables.
 908          * @todo FIXME: implement this a little better (seperate select/insert)?
 909         */
 910         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabasePostgres::insertSelect',
 911                 $insertOptions = array(), $selectOptions = array() )
 912         {
 913                 $destTable = $this->tableName( $destTable );
 914
 915                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 916                 $ignore = in_array( 'IGNORE', $insertOptions ) ? 'mw' : '';
 917
 918                 if( is_array( $insertOptions ) ) {
 919                         $insertOptions = implode( ' ', $insertOptions );
 920                 }
 921                 if( !is_array( $selectOptions ) ) {
 922                         $selectOptions = array( $selectOptions );
 923                 }
 924                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 925                 if( is_array( $srcTable ) ) {
 926                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 927                 } else {
 928                         $srcTable = $this->tableName( $srcTable );
 929                 }
 930
 931                 // If we are not in a transaction, we need to be for savepoint trickery
 932                 $didbegin = 0;
 933                 if ( $ignore ) {
 934                         if( !$this->mTrxLevel ) {
 935                                 $this->begin();
 936                                 $didbegin = 1;
 937                         }
 938                         $olde = error_reporting( 0 );
 939                         $numrowsinserted = 0;
 940                         pg_query( $this->mConn, "SAVEPOINT $ignore");
 941                 }
 942
 943                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 944                                 " SELECT $startOpts " . implode( ',', $varMap ) .
 945                                 " FROM $srcTable $useIndex";
 946
 947                 if ( $conds != '*') {
 948                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 949                 }
 950
 951                 $sql .= " $tailOpts";
 952
 953                 $res = (bool)$this->query( $sql, $fname, $ignore );
 954                 if( $ignore ) {
 955                         $bar = pg_last_error();
 956                         if( $bar != false ) {
 957                                 pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 958                         } else {
 959                                 pg_query( $this->mConn, "RELEASE $ignore" );
 960                                 $numrowsinserted++;
 961                         }
 962                         $olde = error_reporting( $olde );
 963                         if( $didbegin ) {
 964                                 $this->commit();
 965                         }
 966
 967                         // Set the affected row count for the whole operation
 968                         $this->mAffectedRows = $numrowsinserted;
 969
 970                         // IGNORE always returns true
 971                         return true;
 972                 }
 973
 974                 return $res;
 975         }
 976
 977         function tableName( $name ) {
 978                 # Replace reserved words with better ones
 979                 switch( $name ) {
 980                         case 'user':
 981                                 return 'mwuser';
 982                         case 'text':
 983                                 return 'pagecontent';
 984                         default:
 985                                 return $name;
 986                 }
 987         }
 988
 989         /**
 990          * Return the next in a sequence, save the value for retrieval via insertId()
 991          */
 992         function nextSequenceValue( $seqName ) {
 993                 $safeseq = preg_replace( "/'/", "''", $seqName );
 994                 $res = $this->query( "SELECT nextval('$safeseq')" );
 995                 $row = $this->fetchRow( $res );
 996                 $this->mInsertId = $row[0];
 997                 $this->freeResult( $res );
 998                 return $this->mInsertId;
 999         }
1000
1001         /**
1002          * Return the current value of a sequence. Assumes it has been nextval'ed in this session.
1003          */
1004         function currentSequenceValue( $seqName ) {
1005                 $safeseq = preg_replace( "/'/", "''", $seqName );
1006                 $res = $this->query( "SELECT currval('$safeseq')" );
1007                 $row = $this->fetchRow( $res );
1008                 $currval = $row[0];
1009                 $this->freeResult( $res );
1010                 return $currval;
1011         }
1012
1013         # REPLACE query wrapper
1014         # Postgres simulates this with a DELETE followed by INSERT
1015         # $row is the row to insert, an associative array
1016         # $uniqueIndexes is an array of indexes. Each element may be either a
1017         # field name or an array of field names
1018         #
1019         # It may be more efficient to leave off unique indexes which are unlikely to collide.
1020         # However if you do this, you run the risk of encountering errors which wouldn't have
1021         # occurred in MySQL
1022         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabasePostgres::replace' ) {
1023                 $table = $this->tableName( $table );
1024
1025                 if (count($rows)==0) {
1026                         return;
1027                 }
1028
1029                 # Single row case
1030                 if ( !is_array( reset( $rows ) ) ) {
1031                         $rows = array( $rows );
1032                 }
1033
1034                 foreach( $rows as $row ) {
1035                         # Delete rows which collide
1036                         if ( $uniqueIndexes ) {
1037                                 $sql = "DELETE FROM $table WHERE ";
1038                                 $first = true;
1039                                 foreach ( $uniqueIndexes as $index ) {
1040                                         if ( $first ) {
1041                                                 $first = false;
1042                                                 $sql .= "(";
1043                                         } else {
1044                                                 $sql .= ') OR (';
1045                                         }
1046                                         if ( is_array( $index ) ) {
1047                                                 $first2 = true;
1048                                                 foreach ( $index as $col ) {
1049                                                         if ( $first2 ) {
1050                                                                 $first2 = false;
1051                                                         } else {
1052                                                                 $sql .= ' AND ';
1053                                                         }
1054                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
1055                                                 }
1056                                         } else {
1057                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
1058                                         }
1059                                 }
1060                                 $sql .= ')';
1061                                 $this->query( $sql, $fname );
1062                         }
1063
1064                         # Now insert the row
1065                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
1066                                 $this->makeList( $row, LIST_COMMA ) . ')';
1067                         $this->query( $sql, $fname );
1068                 }
1069         }
1070
1071         # DELETE where the condition is a join
1072         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabasePostgres::deleteJoin' ) {
1073                 if ( !$conds ) {
1074                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
1075                 }
1076
1077                 $delTable = $this->tableName( $delTable );
1078                 $joinTable = $this->tableName( $joinTable );
1079                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
1080                 if ( $conds != '*' ) {
1081                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
1082                 }
1083                 $sql .= ')';
1084
1085                 $this->query( $sql, $fname );
1086         }
1087
1088         # Returns the size of a text field, or -1 for "unlimited"
1089         function textFieldSize( $table, $field ) {
1090                 $table = $this->tableName( $table );
1091                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
1092                         FROM pg_class c, pg_attribute a, pg_type t
1093                         WHERE relname='$table' AND a.attrelid=c.oid AND
1094                                 a.atttypid=t.oid and a.attname='$field'";
1095                 $res =$this->query($sql);
1096                 $row=$this->fetchObject($res);
1097                 if ($row->ftype=="varchar") {
1098                         $size=$row->size-4;
1099                 } else {
1100                         $size=$row->size;
1101                 }
1102                 $this->freeResult( $res );
1103                 return $size;
1104         }
1105
1106         function limitResult($sql, $limit, $offset=false) {
1107                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
1108         }
1109
1110         function wasDeadlock() {
1111                 return $this->lastErrno() == '40P01';
1112         }
1113
1114         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabasePostgres::duplicateTableStructure' ) {
1115                 return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
1116         }
1117
1118         function timestamp( $ts=0 ) {
1119                 return wfTimestamp(TS_POSTGRES,$ts);
1120         }
1121
1122         /**
1123          * Return aggregated value function call
1124          */
1125         function aggregateValue ($valuedata,$valuename='value') {
1126                 return $valuedata;
1127         }
1128
1129
1130         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1131                 // Ignore errors during error handling to avoid infinite recursion
1132                 $ignore = $this->ignoreErrors( true );
1133                 $this->mErrorCount++;
1134
1135                 if ($ignore || $tempIgnore) {
1136                         wfDebug("SQL ERROR (ignored): $error\n");
1137                         $this->ignoreErrors( $ignore );
1138                 }
1139                 else {
1140                         $message = "A database error has occurred\n" .
1141                                 "Query: $sql\n" .
1142                                 "Function: $fname\n" .
1143                                 "Error: $errno $error\n";
1144                         throw new DBUnexpectedError($this, $message);
1145                 }
1146         }
1147
1148         /**
1149          * @return string wikitext of a link to the server software's web site
1150          */
1151         function getSoftwareLink() {
1152                 return "[http://www.postgresql.org/ PostgreSQL]";
1153         }
1154
1155         /**
1156          * @return string Version information from the database
1157          */
1158         function getServerVersion() {
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                 return $this->numeric_version;
1171         }
1172
1173         /**
1174          * Query whether a given relation exists (in the given schema, or the
1175          * default mw one if not given)
1176          */
1177         function relationExists( $table, $types, $schema = false ) {
1178                 global $wgDBmwschema;
1179                 if ( !is_array( $types ) )
1180                         $types = array( $types );
1181                 if ( !$schema )
1182                         $schema = $wgDBmwschema;
1183                 $etable = $this->addQuotes( $table );
1184                 $eschema = $this->addQuotes( $schema );
1185                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1186                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1187                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1188                 $res = $this->query( $SQL );
1189                 $count = $res ? $res->numRows() : 0;
1190                 if ($res)
1191                         $this->freeResult( $res );
1192                 return $count ? true : false;
1193         }
1194
1195         /*
1196          * For backward compatibility, this function checks both tables and
1197          * views.
1198          */
1199         function tableExists( $table, $schema = false ) {
1200                 return $this->relationExists( $table, array( 'r', 'v' ), $schema );
1201         }
1202
1203         function sequenceExists( $sequence, $schema = false ) {
1204                 return $this->relationExists( $sequence, 'S', $schema );
1205         }
1206
1207         function triggerExists( $table, $trigger ) {
1208                 global $wgDBmwschema;
1209
1210                 $q = <<<SQL
1211         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1212                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1213                       AND tgrelid=pg_class.oid
1214                       AND nspname=%s AND relname=%s AND tgname=%s
1215 SQL;
1216                 $res = $this->query(sprintf($q,
1217                                 $this->addQuotes($wgDBmwschema),
1218                                 $this->addQuotes($table),
1219                                 $this->addQuotes($trigger)));
1220                 if (!$res)
1221                         return null;
1222                 $rows = $res->numRows();
1223                 $this->freeResult( $res );
1224                 return $rows;
1225         }
1226
1227         function ruleExists( $table, $rule ) {
1228                 global $wgDBmwschema;
1229                 $exists = $this->selectField("pg_rules", "rulename",
1230                                 array(  "rulename" => $rule,
1231                                         "tablename" => $table,
1232                                         "schemaname" => $wgDBmwschema ) );
1233                 return $exists === $rule;
1234         }
1235
1236         function constraintExists( $table, $constraint ) {
1237                 global $wgDBmwschema;
1238                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1239                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1240                         $this->addQuotes($wgDBmwschema),
1241                         $this->addQuotes($table),
1242                         $this->addQuotes($constraint));
1243                 $res = $this->query($SQL);
1244                 if (!$res)
1245                         return null;
1246                 $rows = $res->numRows();
1247                 $this->freeResult($res);
1248                 return $rows;
1249         }
1250
1251         /**
1252          * Query whether a given schema exists. Returns the name of the owner
1253          */
1254         function schemaExists( $schema ) {
1255                 $eschema = preg_replace("/'/", "''", $schema);
1256                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1257                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1258                 $res = $this->query( $SQL );
1259                 if ( $res && $res->numRows() ) {
1260                         $row = $res->fetchObject();
1261                         $owner = $row->rolname;
1262                 } else {
1263                         $owner = false;
1264                 }
1265                 if ($res)
1266                         $this->freeResult($res);
1267                 return $owner;
1268         }
1269
1270         function fieldInfo( $table, $field ) {
1271                 return PostgresField::fromText($this, $table, $field);
1272         }
1273
1274         /**
1275          * pg_field_type() wrapper
1276          */
1277         function fieldType( $res, $index ) {
1278                 if ( $res instanceof ResultWrapper ) {
1279                         $res = $res->result;
1280                 }
1281                 return pg_field_type( $res, $index );
1282         }
1283
1284         function begin( $fname = 'DatabasePostgres::begin' ) {
1285                 $this->query( 'BEGIN', $fname );
1286                 $this->mTrxLevel = 1;
1287         }
1288
1289         function commit( $fname = 'DatabasePostgres::commit' ) {
1290                 $this->query( 'COMMIT', $fname );
1291                 $this->mTrxLevel = 0;
1292         }
1293
1294         /* Not even sure why this is used in the main codebase... */
1295         function limitResultForUpdate( $sql, $num ) {
1296                 return $sql;
1297         }
1298
1299         function setup_database() {
1300                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1301
1302                 // Make sure that we can write to the correct schema
1303                 // If not, Postgres will happily and silently go to the next search_path item
1304                 $ctest = "mediawiki_test_table";
1305                 $safeschema = $this->quote_ident($wgDBmwschema);
1306                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1307                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1308                 }
1309                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1310                 $olde = error_reporting( 0 );
1311                 $res = $this->doQuery($SQL);
1312                 error_reporting( $olde );
1313                 if (!$res) {
1314                         print "<b>FAILED</b>. Make sure that the user \"" . htmlspecialchars( $wgDBuser ) .
1315                                 "\" can write to the schema \"" . htmlspecialchars( $wgDBmwschema ) . "\"</li>\n";
1316                         dieout(""); # Will close the main list <ul> and finish the page.
1317                 }
1318                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1319
1320                 $res = $this->sourceFile( "../maintenance/postgres/tables.sql" );
1321                 if ($res === true) {
1322                         print " done.</li>\n";
1323                 } else {
1324                         print " <b>FAILED</b></li>\n";
1325                         dieout( htmlspecialchars( $res ) );
1326                 }
1327
1328                 ## Update version information
1329                 $mwv = $this->addQuotes($wgVersion);
1330                 $pgv = $this->addQuotes($this->getServerVersion());
1331                 $pgu = $this->addQuotes($this->mUser);
1332                 $mws = $this->addQuotes($wgDBmwschema);
1333                 $tss = $this->addQuotes($wgDBts2schema);
1334                 $pgp = $this->addQuotes($wgDBport);
1335                 $dbn = $this->addQuotes($this->mDBname);
1336                 $ctype = $this->addQuotes( pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0) );
1337
1338                 echo "<li>Populating interwiki table... ";
1339                 ## Avoid the non-standard "REPLACE INTO" syntax
1340                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1341                 if ( !$f ) {
1342                         print "<b>FAILED</b></li>";
1343                         dieout( "Could not find the interwiki.sql file" );
1344                 }
1345                 ## We simply assume it is already empty as we have just created it
1346                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1347                 while ( ! feof( $f ) ) {
1348                         $line = fgets($f,1024);
1349                         $matches = array();
1350                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1351                                 continue;
1352                         }
1353                         $this->query("$SQL $matches[1],$matches[2])");
1354                 }
1355                 print " successfully populated.</li>\n";
1356
1357                 $this->doQuery("COMMIT");
1358         }
1359
1360         function encodeBlob( $b ) {
1361                 return new Blob ( pg_escape_bytea( $b ) ) ;
1362         }
1363
1364         function decodeBlob( $b ) {
1365                 if ($b instanceof Blob) {
1366                         $b = $b->fetch();
1367                 }
1368                 return pg_unescape_bytea( $b );
1369         }
1370
1371         function strencode( $s ) { ## Should not be called by us
1372                 return pg_escape_string( $s );
1373         }
1374
1375         function addQuotes( $s ) {
1376                 if ( is_null( $s ) ) {
1377                         return 'NULL';
1378                 } else if ( is_bool( $s ) ) {
1379                         return intval( $s );
1380                 } else if ($s instanceof Blob) {
1381                         return "'".$s->fetch($s)."'";
1382                 }
1383                 return "'" . pg_escape_string($s) . "'";
1384         }
1385
1386         function quote_ident( $s ) {
1387                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1388         }
1389
1390         /**
1391          * Postgres specific version of replaceVars.
1392          * Calls the parent version in Database.php
1393          *
1394          * @private
1395          *
1396          * @param $ins String: SQL string, read from a stream (usually tables.sql)
1397          *
1398          * @return string SQL string
1399          */
1400         protected function replaceVars( $ins ) {
1401
1402                 $ins = parent::replaceVars( $ins );
1403
1404                 if ($this->numeric_version >= 8.3) {
1405                         // Thanks for not providing backwards-compatibility, 8.3
1406                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1407                 }
1408
1409                 if ($this->numeric_version <= 8.1) { // Our minimum version
1410                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1411                 }
1412
1413                 return $ins;
1414         }
1415
1416         /**
1417          * Various select options
1418          *
1419          * @private
1420          *
1421          * @param $options Array: an associative array of options to be turned into
1422          *              an SQL query, valid keys are listed in the function.
1423          * @return array
1424          */
1425         function makeSelectOptions( $options ) {
1426                 $preLimitTail = $postLimitTail = '';
1427                 $startOpts = $useIndex = '';
1428
1429                 $noKeyOptions = array();
1430                 foreach ( $options as $key => $option ) {
1431                         if ( is_numeric( $key ) ) {
1432                                 $noKeyOptions[$option] = true;
1433                         }
1434                 }
1435
1436                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1437                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1438                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1439
1440                 //if (isset($options['LIMIT'])) {
1441                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1442                 //              isset($options['OFFSET']) ? $options['OFFSET']
1443                 //              : false);
1444                 //}
1445
1446                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1447                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1448                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1449
1450                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1451         }
1452
1453         function setFakeMaster( $enabled = true ) {}
1454
1455         function getDBname() {
1456                 return $this->mDBname;
1457         }
1458
1459         function getServer() {
1460                 return $this->mServer;
1461         }
1462
1463         function buildConcat( $stringList ) {
1464                 return implode( ' || ', $stringList );
1465         }
1466
1467         public function getSearchEngine() {
1468                 return "SearchPostgres";
1469         }
1470 } // end DatabasePostgres class