includes/DatabasePostgres.php

   1 <?php
   2
   3 /**
   4  * This is the Postgres database abstraction layer.
   5  *
   6  * As it includes more generic version for DB functions,
   7  * than MySQL ones, some of them should be moved to parent
   8  * Database class.
   9  *
  10  * @addtogroup Database
  11  */
  12 class PostgresField {
  13         private $name, $tablename, $type, $nullable, $max_length;
  14
  15         static function fromText($db, $table, $field) {
  16         global $wgDBmwschema;
  17
  18                 $q = <<<END
  19 SELECT typname, attnotnull, attlen
  20 FROM pg_class, pg_namespace, pg_attribute, pg_type
  21 WHERE relnamespace=pg_namespace.oid
  22 AND relkind='r'
  23 AND attrelid=pg_class.oid
  24 AND atttypid=pg_type.oid
  25 AND nspname=%s
  26 AND relname=%s
  27 AND attname=%s;
  28 END;
  29                 $res = $db->query(sprintf($q,
  30                                 $db->addQuotes($wgDBmwschema),
  31                                 $db->addQuotes($table),
  32                                 $db->addQuotes($field)));
  33                 $row = $db->fetchObject($res);
  34                 if (!$row)
  35                         return null;
  36                 $n = new PostgresField;
  37                 $n->type = $row->typname;
  38                 $n->nullable = ($row->attnotnull == 'f');
  39                 $n->name = $field;
  40                 $n->tablename = $table;
  41                 $n->max_length = $row->attlen;
  42                 return $n;
  43         }
  44
  45         function name() {
  46                 return $this->name;
  47         }
  48
  49         function tableName() {
  50                 return $this->tablename;
  51         }
  52
  53         function type() {
  54                 return $this->type;
  55         }
  56
  57         function nullable() {
  58                 return $this->nullable;
  59         }
  60
  61         function maxLength() {
  62                 return $this->max_length;
  63         }
  64 }
  65
  66 /**
  67  * @addtogroup Database
  68  */
  69 class DatabasePostgres extends Database {
  70         var $mInsertId = NULL;
  71         var $mLastResult = NULL;
  72         var $numeric_version = NULL;
  73
  74         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  75                 $failFunction = false, $flags = 0 )
  76         {
  77
  78                 global $wgOut;
  79                 # Can't get a reference if it hasn't been set yet
  80                 if ( !isset( $wgOut ) ) {
  81                         $wgOut = NULL;
  82                 }
  83                 $this->mOut =& $wgOut;
  84                 $this->mFailFunction = $failFunction;
  85                 $this->mFlags = $flags;
  86                 $this->open( $server, $user, $password, $dbName);
  87
  88         }
  89
  90         function cascadingDeletes() {
  91                 return true;
  92         }
  93         function cleanupTriggers() {
  94                 return true;
  95         }
  96         function strictIPs() {
  97                 return true;
  98         }
  99         function realTimestamps() {
 100                 return true;
 101         }
 102         function implicitGroupby() {
 103                 return false;
 104         }
 105         function implicitOrderby() {
 106                 return false;
 107         }
 108         function searchableIPs() {
 109                 return true;
 110         }
 111         function functionalIndexes() {
 112                 return true;
 113         }
 114
 115         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 116         {
 117                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 118         }
 119
 120         /**
 121          * Usually aborts on failure
 122          * If the failFunction is set to a non-zero integer, returns success
 123          */
 124         function open( $server, $user, $password, $dbName ) {
 125                 # Test for Postgres support, to avoid suppressed fatal error
 126                 if ( !function_exists( 'pg_connect' ) ) {
 127                         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" );
 128                 }
 129
 130                 global $wgDBport;
 131
 132                 if (!strlen($user)) { ## e.g. the class is being loaded
 133                         return;
 134                 }
 135
 136                 $this->close();
 137                 $this->mServer = $server;
 138                 $port = $wgDBport;
 139                 $this->mUser = $user;
 140                 $this->mPassword = $password;
 141                 $this->mDBname = $dbName;
 142
 143                 $hstring="";
 144                 if ($server!=false && $server!="") {
 145                         $hstring="host=$server ";
 146                 }
 147                 if ($port!=false && $port!="") {
 148                         $hstring .= "port=$port ";
 149                 }
 150
 151
 152                 error_reporting( E_ALL );
 153                 @$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
 154
 155                 if ( $this->mConn == false ) {
 156                         wfDebug( "DB connection error\n" );
 157                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 158                         wfDebug( $this->lastError()."\n" );
 159                         return false;
 160                 }
 161
 162                 $this->mOpened = true;
 163                 ## If this is the initial connection, setup the schema stuff and possibly create the user
 164                 ## TODO: Move this out of open()
 165                 if (defined('MEDIAWIKI_INSTALL')) {
 166                         global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema,
 167                                 $wgDBts2schema;
 168
 169                         print "<li>Checking the version of Postgres...";
 170                         $version = $this->getServerVersion();
 171                         $PGMINVER = "8.1";
 172                         if ($this->numeric_version < $PGMINVER) {
 173                                 print "<b>FAILED</b>. Required version is $PGMINVER. You have $this->numeric_version ($version)</li>\n";
 174                                 dieout("</ul>");
 175                         }
 176                         print "version $this->numeric_version is OK.</li>\n";
 177
 178                         $safeuser = $this->quote_ident($wgDBuser);
 179                         ## Are we connecting as a superuser for the first time?
 180                         if ($wgDBsuperuser) {
 181                                 ## Are we really a superuser? Check out our rights
 182                                 $SQL = "SELECT
 183                                                 CASE WHEN usesuper IS TRUE THEN
 184                                                         CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 185                                                         ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 186                         END AS rights
 187                                                 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 188                                 $rows = $this->numRows($res = $this->doQuery($SQL));
 189                                 if (!$rows) {
 190                                         print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 191                                         dieout('</ul>');
 192                                 }
 193                                 $perms = pg_fetch_result($res, 0, 0);
 194
 195                                 $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 196                                 $rows = $this->numRows($this->doQuery($SQL));
 197                                 if ($rows) {
 198                                         print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 199                                 }
 200                                 else {
 201                                         if ($perms != 1 and $perms != 3) {
 202                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 203                                                 print 'Please use a different Postgres user.</li>';
 204                                                 dieout('</ul>');
 205                                         }
 206                                         print "<li>Creating user <b>$wgDBuser</b>...";
 207                                         $safepass = $this->addQuotes($wgDBpassword);
 208                                         $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 209                                         $this->doQuery($SQL);
 210                                         print "OK</li>\n";
 211                                 }
 212                                 ## User now exists, check out the database
 213                                 if ($dbName != $wgDBname) {
 214                                         $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 215                                         $rows = $this->numRows($this->doQuery($SQL));
 216                                         if ($rows) {
 217                                                 print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 218                                         }
 219                                         else {
 220                                                 if ($perms < 2) {
 221                                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 222                                                         print 'Please use a different Postgres user.</li>';
 223                                                         dieout('</ul>');
 224                                                 }
 225                                                 print "<li>Creating database <b>$wgDBname</b>...";
 226                                                 $safename = $this->quote_ident($wgDBname);
 227                                                 $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 228                                                 $this->doQuery($SQL);
 229                                                 print "OK</li>\n";
 230                                                 ## Hopefully tsearch2 and plpgsql are in template1...
 231                                         }
 232
 233                                         ## Reconnect to check out tsearch2 rights for this user
 234                                         print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 235                                         @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$user password=$password");
 236                                         if ( $this->mConn == false ) {
 237                                                 print "<b>FAILED TO CONNECT!</b></li>";
 238                                                 dieout("</ul>");
 239                                         }
 240                                         print "OK</li>\n";
 241                                 }
 242
 243                                 ## Tsearch2 checks
 244                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 245                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 246                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 247                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 248                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 249                                         dieout("</ul>");
 250                                 }
 251                                 print "OK</li>\n";
 252                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 253                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 254                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 255                                         $this->doQuery($SQL);
 256                                 }
 257                                 print "OK</li>\n";
 258
 259
 260                                 ## Setup the schema for this user if needed
 261                                 $result = $this->schemaExists($wgDBmwschema);
 262                                 $safeschema = $this->quote_ident($wgDBmwschema);
 263                                 if (!$result) {
 264                                         print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 265                                         $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 266                                         if (!$result) {
 267                                                 print "<b>FAILED</b>.</li>\n";
 268                                                 dieout("</ul>");
 269                                         }
 270                                         print "OK</li>\n";
 271                                 }
 272                                 else {
 273                                         print "<li>Schema already exists, explicitly granting rights...\n";
 274                                         $safeschema2 = $this->addQuotes($wgDBmwschema);
 275                                         $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 276                                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 277                                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 278                                                         "AND p.relkind IN ('r','S','v')\n";
 279                                         $SQL .= "UNION\n";
 280                                         $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 281                                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 282                                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 283                                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 284                                         $res = $this->doQuery($SQL);
 285                                         if (!$res) {
 286                                                 print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 287                                                 dieout("</ul>");
 288                                         }
 289                                         $this->doQuery("SET search_path = $safeschema");
 290                                         $rows = $this->numRows($res);
 291                                         while ($rows) {
 292                                                 $rows--;
 293                                                 $this->doQuery(pg_fetch_result($res, $rows, 0));
 294                                         }
 295                                         print "OK</li>";
 296                                 }
 297
 298                                 $wgDBsuperuser = '';
 299                                 return true; ## Reconnect as regular user
 300
 301                         } ## end superuser
 302
 303                 if (!defined('POSTGRES_SEARCHPATH')) {
 304
 305                         ## Do we have the basic tsearch2 table?
 306                         print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 307                         if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 308                                 print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 309                                 print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 310                                 print " for instructions.</li>\n";
 311                                 dieout("</ul>");
 312                         }
 313                         print "OK</li>\n";
 314
 315                         ## Does this user have the rights to the tsearch2 tables?
 316                         $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 317                         print "<li>Checking tsearch2 permissions...";
 318                         ## Let's check all four, just to be safe
 319                         error_reporting( 0 );
 320                         $ts2tables = array('cfg','cfgmap','dict','parser');
 321                         foreach ( $ts2tables AS $tname ) {
 322                                 $SQL = "SELECT count(*) FROM $wgDBts2schema.pg_ts_$tname";
 323                                 $res = $this->doQuery($SQL);
 324                                 if (!$res) {
 325                                         print "<b>FAILED</b> to access pg_ts_$tname. Make sure that the user ".
 326                                         "\"$wgDBuser\" has SELECT access to all four tsearch2 tables</li>\n";
 327                                         dieout("</ul>");
 328                                 }
 329                         }
 330                         $SQL = "SELECT ts_name FROM $wgDBts2schema.pg_ts_cfg WHERE locale = '$ctype'";
 331                         $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 332                         $res = $this->doQuery($SQL);
 333                         error_reporting( E_ALL );
 334                         if (!$res) {
 335                                 print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 336                                 dieout("</ul>");
 337                         }
 338                         print "OK</li>";
 339
 340                         ## Will the current locale work? Can we force it to?
 341                         print "<li>Verifying tsearch2 locale with $ctype...";
 342                         $rows = $this->numRows($res);
 343                         $resetlocale = 0;
 344                         if (!$rows) {
 345                                 print "<b>not found</b></li>\n";
 346                                 print "<li>Attempting to set default tsearch2 locale to \"$ctype\"...";
 347                                 $resetlocale = 1;
 348                         }
 349                         else {
 350                                 $tsname = pg_fetch_result($res, 0, 0);
 351                                 if ($tsname != 'default') {
 352                                         print "<b>not set to default ($tsname)</b>";
 353                                         print "<li>Attempting to change tsearch2 default locale to \"$ctype\"...";
 354                                         $resetlocale = 1;
 355                                 }
 356                         }
 357                         if ($resetlocale) {
 358                                 $SQL = "UPDATE $wgDBts2schema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
 359                                 $res = $this->doQuery($SQL);
 360                                 if (!$res) {
 361                                         print "<b>FAILED</b>. ";
 362                                         print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"</li>\n";
 363                                         dieout("</ul>");
 364                                 }
 365                                 print "OK</li>";
 366                         }
 367
 368                         ## Final test: try out a simple tsearch2 query
 369                         $SQL = "SELECT $wgDBts2schema.to_tsvector('default','MediaWiki tsearch2 testing')";
 370                         $res = $this->doQuery($SQL);
 371                         if (!$res) {
 372                                 print "<b>FAILED</b>. Specifically, \"$SQL\" did not work.</li>";
 373                                 dieout("</ul>");
 374                         }
 375                         print "OK</li>";
 376
 377                         ## Do we have plpgsql installed?
 378                         print "<li>Checking for Pl/Pgsql ...";
 379                         $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 380                         $rows = $this->numRows($this->doQuery($SQL));
 381                         if ($rows < 1) {
 382                                 // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 383                                 print "not installed. Attempting to install Pl/Pgsql ...";
 384                                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 385                                         "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 386                                 $rows = $this->numRows($this->doQuery($SQL));
 387                                 if ($rows >= 1) {
 388                                         $olde = error_reporting(0);
 389                                         error_reporting($olde - E_WARNING);
 390                                         $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 391                                         error_reporting($olde);
 392                                         if (!$result) {
 393                                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 394                                                 dieout("</ul>");
 395                                         }
 396                                 }
 397                                 else {
 398                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 399                                         dieout("</ul>");
 400                                 }
 401                         }
 402                         print "OK</li>\n";
 403
 404                         ## Does the schema already exist? Who owns it?
 405                         $result = $this->schemaExists($wgDBmwschema);
 406                         if (!$result) {
 407                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 408                                 error_reporting( 0 );
 409                                 $result = $this->doQuery("CREATE SCHEMA $wgDBmwschema");
 410                                 error_reporting( E_ALL );
 411                                 if (!$result) {
 412                                         print "<b>FAILED</b>. The user \"$wgDBuser\" must be able to access the schema. ".
 413                                         "You can try making them the owner of the database, or try creating the schema with a ".
 414                                         "different user, and then grant access to the \"$wgDBuser\" user.</li>\n";
 415                                         dieout("</ul>");
 416                                 }
 417                                 print "OK</li>\n";
 418                         }
 419                         else if ($result != $user) {
 420                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$user\". Not ideal.</li>\n";
 421                         }
 422                         else {
 423                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$user\". Excellent.</li>\n";
 424                         }
 425
 426                         ## Always return GMT time to accomodate the existing integer-based timestamp assumption
 427                         print "<li>Setting the timezone to GMT for user \"$user\" ...";
 428                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 429                         $result = pg_query($this->mConn, $SQL);
 430                         if (!$result) {
 431                                 print "<b>FAILED</b>.</li>\n";
 432                                 dieout("</ul>");
 433                         }
 434                         print "OK</li>\n";
 435                         ## Set for the rest of this session
 436                         $SQL = "SET timezone = 'GMT'";
 437                         $result = pg_query($this->mConn, $SQL);
 438                         if (!$result) {
 439                                 print "<li>Failed to set timezone</li>\n";
 440                                 dieout("</ul>");
 441                         }
 442
 443                         print "<li>Setting the datestyle to ISO, YMD for user \"$user\" ...";
 444                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 445                         $result = pg_query($this->mConn, $SQL);
 446                         if (!$result) {
 447                                 print "<b>FAILED</b>.</li>\n";
 448                                 dieout("</ul>");
 449                         }
 450                         print "OK</li>\n";
 451                         ## Set for the rest of this session
 452                         $SQL = "SET datestyle = 'ISO, YMD'";
 453                         $result = pg_query($this->mConn, $SQL);
 454                         if (!$result) {
 455                                 print "<li>Failed to set datestyle</li>\n";
 456                                 dieout("</ul>");
 457                         }
 458
 459                         ## Fix up the search paths if needed
 460                         print "<li>Setting the search path for user \"$user\" ...";
 461                         $path = $this->quote_ident($wgDBmwschema);
 462                         if ($wgDBts2schema !== $wgDBmwschema)
 463                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 464                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 465                                 $path .= ", public";
 466                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 467                         $result = pg_query($this->mConn, $SQL);
 468                         if (!$result) {
 469                                 print "<b>FAILED</b>.</li>\n";
 470                                 dieout("</ul>");
 471                         }
 472                         print "OK</li>\n";
 473                         ## Set for the rest of this session
 474                         $SQL = "SET search_path = $path";
 475                         $result = pg_query($this->mConn, $SQL);
 476                         if (!$result) {
 477                                 print "<li>Failed to set search_path</li>\n";
 478                                 dieout("</ul>");
 479                         }
 480                         define( "POSTGRES_SEARCHPATH", $path );
 481                 }}
 482
 483                 global $wgCommandLineMode;
 484                 ## If called from the command-line (e.g. importDump), only show errors
 485                 if ($wgCommandLineMode) {
 486                         $this->doQuery("SET client_min_messages = 'ERROR'");
 487                 }
 488
 489                 return $this->mConn;
 490         }
 491
 492         /**
 493          * Closes a database connection, if it is open
 494          * Returns success, true if already closed
 495          */
 496         function close() {
 497                 $this->mOpened = false;
 498                 if ( $this->mConn ) {
 499                         return pg_close( $this->mConn );
 500                 } else {
 501                         return true;
 502                 }
 503         }
 504
 505         function doQuery( $sql ) {
 506                 return $this->mLastResult=pg_query( $this->mConn , $sql);
 507         }
 508
 509         function queryIgnore( $sql, $fname = '' ) {
 510                 return $this->query( $sql, $fname, true );
 511         }
 512
 513         function freeResult( $res ) {
 514                 if ( $res instanceof ResultWrapper ) {
 515                         $res = $res->result;
 516                 }
 517                 if ( !@pg_free_result( $res ) ) {
 518                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 519                 }
 520         }
 521
 522         function fetchObject( $res ) {
 523                 if ( $res instanceof ResultWrapper ) {
 524                         $res = $res->result;
 525                 }
 526                 @$row = pg_fetch_object( $res );
 527                 # FIXME: HACK HACK HACK HACK debug
 528
 529                 # TODO:
 530                 # hashar : not sure if the following test really trigger if the object
 531                 #          fetching failed.
 532                 if( pg_last_error($this->mConn) ) {
 533                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 534                 }
 535                 return $row;
 536         }
 537
 538         function fetchRow( $res ) {
 539                 if ( $res instanceof ResultWrapper ) {
 540                         $res = $res->result;
 541                 }
 542                 @$row = pg_fetch_array( $res );
 543                 if( pg_last_error($this->mConn) ) {
 544                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 545                 }
 546                 return $row;
 547         }
 548
 549         function numRows( $res ) {
 550                 if ( $res instanceof ResultWrapper ) {
 551                         $res = $res->result;
 552                 }
 553                 @$n = pg_num_rows( $res );
 554                 if( pg_last_error($this->mConn) ) {
 555                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 556                 }
 557                 return $n;
 558         }
 559         function numFields( $res ) {
 560                 if ( $res instanceof ResultWrapper ) {
 561                         $res = $res->result;
 562                 }
 563                 return pg_num_fields( $res );
 564         }
 565         function fieldName( $res, $n ) {
 566                 if ( $res instanceof ResultWrapper ) {
 567                         $res = $res->result;
 568                 }
 569                 return pg_field_name( $res, $n );
 570         }
 571
 572         /**
 573          * This must be called after nextSequenceVal
 574          */
 575         function insertId() {
 576                 return $this->mInsertId;
 577         }
 578
 579         function dataSeek( $res, $row ) {
 580                 if ( $res instanceof ResultWrapper ) {
 581                         $res = $res->result;
 582                 }
 583                 return pg_result_seek( $res, $row );
 584         }
 585
 586         function lastError() {
 587                 if ( $this->mConn ) {
 588                         return pg_last_error();
 589                 }
 590                 else {
 591                         return "No database connection";
 592                 }
 593         }
 594         function lastErrno() {
 595                 return pg_last_error() ? 1 : 0;
 596         }
 597
 598         function affectedRows() {
 599                 if( !isset( $this->mLastResult ) or ! $this->mLastResult )
 600                         return 0;
 601
 602                 return pg_affected_rows( $this->mLastResult );
 603         }
 604
 605         /**
 606          * Estimate rows in dataset
 607          * Returns estimated count, based on EXPLAIN output
 608          * This is not necessarily an accurate estimate, so use sparingly
 609          * Returns -1 if count cannot be found
 610          * Takes same arguments as Database::select()
 611          */
 612
 613         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
 614                 $options['EXPLAIN'] = true;
 615                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 616                 $rows = -1;
 617                 if ( $res ) {
 618                         $row = $this->fetchRow( $res );
 619                         $count = array();
 620                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 621                                 $rows = $count[1];
 622                         }
 623                         $this->freeResult($res);
 624                 }
 625                 return $rows;
 626         }
 627
 628
 629         /**
 630          * Returns information about an index
 631          * If errors are explicitly ignored, returns NULL on failure
 632          */
 633         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 634                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 635                 $res = $this->query( $sql, $fname );
 636                 if ( !$res ) {
 637                         return NULL;
 638                 }
 639                 while ( $row = $this->fetchObject( $res ) ) {
 640                         if ( $row->indexname == $index ) {
 641                                 return $row;
 642                         }
 643                 }
 644                 return false;
 645         }
 646
 647         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 648                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 649                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 650                 $res = $this->query( $sql, $fname );
 651                 if ( !$res )
 652                         return NULL;
 653                 while ($row = $this->fetchObject( $res ))
 654                         return true;
 655                 return false;
 656
 657         }
 658
 659         /**
 660          * INSERT wrapper, inserts an array into a table
 661          *
 662          * $args may be a single associative array, or an array of these with numeric keys,
 663          * for multi-row insert (Postgres version 8.2 and above only).
 664          *
 665          * @param array $table   String: Name of the table to insert to.
 666          * @param array $args    Array: Items to insert into the table.
 667          * @param array $fname   String: Name of the function, for profiling
 668          * @param mixed $options String or Array. Valid options: IGNORE
 669          *
 670          * @return bool Success of insert operation. IGNORE always returns true.
 671          */
 672         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 673                 global $wgDBversion;
 674
 675                 $table = $this->tableName( $table );
 676                 if (! isset( $wgDBversion ) ) {
 677                         $this->getServerVersion();
 678                         $wgDBversion = $this->numeric_version;
 679                 }
 680
 681                 if ( !is_array( $options ) )
 682                         $options = array( $options );
 683
 684                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 685                         $multi = true;
 686                         $keys = array_keys( $args[0] );
 687                 }
 688                 else {
 689                         $multi = false;
 690                         $keys = array_keys( $args );
 691                 }
 692
 693                 $ignore = in_array( 'IGNORE', $options ) ? 1 : 0;
 694                 if ( $ignore )
 695                         $olde = error_reporting( 0 );
 696
 697                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 698
 699                 if ( $multi ) {
 700                         if ( $wgDBversion >= 8.2 ) {
 701                                 $first = true;
 702                                 foreach ( $args as $row ) {
 703                                         if ( $first ) {
 704                                                 $first = false;
 705                                         } else {
 706                                                 $sql .= ',';
 707                                         }
 708                                         $sql .= '(' . $this->makeList( $row ) . ')';
 709                                 }
 710                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 711                         }
 712                         else {
 713                                 $res = true;
 714                                 $origsql = $sql;
 715                                 foreach ( $args as $row ) {
 716                                         $tempsql = $origsql;
 717                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 718                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 719                                         if (! $tempres)
 720                                                 $res = false;
 721                                 }
 722                         }
 723                 }
 724                 else {
 725                         $sql .= '(' . $this->makeList( $args ) . ')';
 726                         $res = (bool)$this->query( $sql, $fname, $ignore );
 727                 }
 728
 729                 if ( $ignore ) {
 730                         $olde = error_reporting( $olde );
 731                         return true;
 732                 }
 733
 734                 return $res;
 735
 736         }
 737
 738         function tableName( $name ) {
 739                 # Replace reserved words with better ones
 740                 switch( $name ) {
 741                         case 'user':
 742                                 return 'mwuser';
 743                         case 'text':
 744                                 return 'pagecontent';
 745                         default:
 746                                 return $name;
 747                 }
 748         }
 749
 750         /**
 751          * Return the next in a sequence, save the value for retrieval via insertId()
 752          */
 753         function nextSequenceValue( $seqName ) {
 754                 $safeseq = preg_replace( "/'/", "''", $seqName );
 755                 $res = $this->query( "SELECT nextval('$safeseq')" );
 756                 $row = $this->fetchRow( $res );
 757                 $this->mInsertId = $row[0];
 758                 $this->freeResult( $res );
 759                 return $this->mInsertId;
 760         }
 761
 762         /**
 763          * Postgres does not have a "USE INDEX" clause, so return an empty string
 764          */
 765         function useIndexClause( $index ) {
 766                 return '';
 767         }
 768
 769         # REPLACE query wrapper
 770         # Postgres simulates this with a DELETE followed by INSERT
 771         # $row is the row to insert, an associative array
 772         # $uniqueIndexes is an array of indexes. Each element may be either a
 773         # field name or an array of field names
 774         #
 775         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 776         # However if you do this, you run the risk of encountering errors which wouldn't have
 777         # occurred in MySQL
 778         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 779                 $table = $this->tableName( $table );
 780
 781                 if (count($rows)==0) {
 782                         return;
 783                 }
 784
 785                 # Single row case
 786                 if ( !is_array( reset( $rows ) ) ) {
 787                         $rows = array( $rows );
 788                 }
 789
 790                 foreach( $rows as $row ) {
 791                         # Delete rows which collide
 792                         if ( $uniqueIndexes ) {
 793                                 $sql = "DELETE FROM $table WHERE ";
 794                                 $first = true;
 795                                 foreach ( $uniqueIndexes as $index ) {
 796                                         if ( $first ) {
 797                                                 $first = false;
 798                                                 $sql .= "(";
 799                                         } else {
 800                                                 $sql .= ') OR (';
 801                                         }
 802                                         if ( is_array( $index ) ) {
 803                                                 $first2 = true;
 804                                                 foreach ( $index as $col ) {
 805                                                         if ( $first2 ) {
 806                                                                 $first2 = false;
 807                                                         } else {
 808                                                                 $sql .= ' AND ';
 809                                                         }
 810                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 811                                                 }
 812                                         } else {
 813                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 814                                         }
 815                                 }
 816                                 $sql .= ')';
 817                                 $this->query( $sql, $fname );
 818                         }
 819
 820                         # Now insert the row
 821                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 822                                 $this->makeList( $row, LIST_COMMA ) . ')';
 823                         $this->query( $sql, $fname );
 824                 }
 825         }
 826
 827         # DELETE where the condition is a join
 828         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 829                 if ( !$conds ) {
 830                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 831                 }
 832
 833                 $delTable = $this->tableName( $delTable );
 834                 $joinTable = $this->tableName( $joinTable );
 835                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 836                 if ( $conds != '*' ) {
 837                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 838                 }
 839                 $sql .= ')';
 840
 841                 $this->query( $sql, $fname );
 842         }
 843
 844         # Returns the size of a text field, or -1 for "unlimited"
 845         function textFieldSize( $table, $field ) {
 846                 $table = $this->tableName( $table );
 847                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 848                         FROM pg_class c, pg_attribute a, pg_type t
 849                         WHERE relname='$table' AND a.attrelid=c.oid AND
 850                                 a.atttypid=t.oid and a.attname='$field'";
 851                 $res =$this->query($sql);
 852                 $row=$this->fetchObject($res);
 853                 if ($row->ftype=="varchar") {
 854                         $size=$row->size-4;
 855                 } else {
 856                         $size=$row->size;
 857                 }
 858                 $this->freeResult( $res );
 859                 return $size;
 860         }
 861
 862         function lowPriorityOption() {
 863                 return '';
 864         }
 865
 866         function limitResult($sql, $limit,$offset=false) {
 867                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 868         }
 869
 870         /**
 871          * Returns an SQL expression for a simple conditional.
 872          * Uses CASE on Postgres
 873          *
 874          * @param string $cond SQL expression which will result in a boolean value
 875          * @param string $trueVal SQL expression to return if true
 876          * @param string $falseVal SQL expression to return if false
 877          * @return string SQL fragment
 878          */
 879         function conditional( $cond, $trueVal, $falseVal ) {
 880                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
 881         }
 882
 883         function wasDeadlock() {
 884                 return $this->lastErrno() == '40P01';
 885         }
 886
 887         function timestamp( $ts=0 ) {
 888                 return wfTimestamp(TS_POSTGRES,$ts);
 889         }
 890
 891         /**
 892          * Return aggregated value function call
 893          */
 894         function aggregateValue ($valuedata,$valuename='value') {
 895                 return $valuedata;
 896         }
 897
 898
 899         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 900                 # Ignore errors during error handling to avoid infinite recursion
 901                 $ignore = $this->ignoreErrors( true );
 902                 ++$this->mErrorCount;
 903
 904                 if ($ignore || $tempIgnore) {
 905                         wfDebug("SQL ERROR (ignored): $error\n");
 906                         $this->ignoreErrors( $ignore );
 907                 }
 908                 else {
 909                         $message = "A database error has occurred\n" .
 910                                 "Query: $sql\n" .
 911                                 "Function: $fname\n" .
 912                                 "Error: $errno $error\n";
 913                         throw new DBUnexpectedError($this, $message);
 914                 }
 915         }
 916
 917         /**
 918          * @return string wikitext of a link to the server software's web site
 919          */
 920         function getSoftwareLink() {
 921                 return "[http://www.postgresql.org/ PostgreSQL]";
 922         }
 923
 924         /**
 925          * @return string Version information from the database
 926          */
 927         function getServerVersion() {
 928                 $version = pg_fetch_result($this->doQuery("SELECT version()"),0,0);
 929                 $thisver = array();
 930                 if (!preg_match('/PostgreSQL (\d+\.\d+)(\S+)/', $version, $thisver)) {
 931                         die("Could not determine the numeric version from $version!");
 932                 }
 933                 $this->numeric_version = $thisver[1];
 934                 return $version;
 935         }
 936
 937
 938         /**
 939          * Query whether a given relation exists (in the given schema, or the
 940          * default mw one if not given)
 941          */
 942         function relationExists( $table, $types, $schema = false ) {
 943                 global $wgDBmwschema;
 944                 if (!is_array($types))
 945                         $types = array($types);
 946                 if (! $schema )
 947                         $schema = $wgDBmwschema;
 948                 $etable = $this->addQuotes($table);
 949                 $eschema = $this->addQuotes($schema);
 950                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
 951                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
 952                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
 953                 $res = $this->query( $SQL );
 954                 $count = $res ? $res->numRows() : 0;
 955                 if ($res)
 956                         $this->freeResult( $res );
 957                 return $count ? true : false;
 958         }
 959
 960         /*
 961          * For backward compatibility, this function checks both tables and
 962          * views.
 963          */
 964         function tableExists ($table, $schema = false) {
 965                 return $this->relationExists($table, array('r', 'v'), $schema);
 966         }
 967
 968         function sequenceExists ($sequence, $schema = false) {
 969                 return $this->relationExists($sequence, 'S', $schema);
 970         }
 971
 972         function triggerExists($table, $trigger) {
 973                 global $wgDBmwschema;
 974
 975                 $q = <<<END
 976         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
 977                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
 978                       AND tgrelid=pg_class.oid
 979                       AND nspname=%s AND relname=%s AND tgname=%s
 980 END;
 981                 $res = $this->query(sprintf($q,
 982                                 $this->addQuotes($wgDBmwschema),
 983                                 $this->addQuotes($table),
 984                                 $this->addQuotes($trigger)));
 985                 if (!$res)
 986                         return NULL;
 987                 $rows = $res->numRows();
 988                 $this->freeResult($res);
 989                 return $rows;
 990         }
 991
 992         function ruleExists($table, $rule) {
 993                 global $wgDBmwschema;
 994                 $exists = $this->selectField("pg_rules", "rulename",
 995                                 array(  "rulename" => $rule,
 996                                         "tablename" => $table,
 997                                         "schemaname" => $wgDBmwschema));
 998                 return $exists === $rule;
 999         }
1000
1001         function constraintExists($table, $constraint) {
1002                 global $wgDBmwschema;
1003                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1004                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1005                         $this->addQuotes($wgDBmwschema),
1006                         $this->addQuotes($table),
1007                         $this->addQuotes($constraint));
1008                 $res = $this->query($SQL);
1009                 if (!$res)
1010                         return NULL;
1011                 $rows = $res->numRows();
1012                 $this->freeResult($res);
1013                 return $rows;
1014         }
1015
1016         /**
1017          * Query whether a given schema exists. Returns the name of the owner
1018          */
1019         function schemaExists( $schema ) {
1020                 $eschema = preg_replace("/'/", "''", $schema);
1021                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1022                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1023                 $res = $this->query( $SQL );
1024                 if ( $res && $res->numRows() ) {
1025                         $row = $res->fetchObject();
1026                         $owner = $row->rolname;
1027                 } else {
1028                         $owner = false;
1029                 }
1030                 if ($res)
1031                         $this->freeResult($res);
1032                 return $owner;
1033         }
1034
1035         /**
1036          * Query whether a given column exists in the mediawiki schema
1037          */
1038         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1039                 global $wgDBmwschema;
1040                 $etable = preg_replace("/'/", "''", $table);
1041                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1042                 $ecol = preg_replace("/'/", "''", $field);
1043                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1044                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1045                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1046                 $res = $this->query( $SQL, $fname );
1047                 $count = $res ? $res->numRows() : 0;
1048                 if ($res)
1049                         $this->freeResult( $res );
1050                 return $count;
1051         }
1052
1053         function fieldInfo( $table, $field ) {
1054                 return PostgresField::fromText($this, $table, $field);
1055         }
1056
1057         function begin( $fname = 'DatabasePostgres::begin' ) {
1058                 $this->query( 'BEGIN', $fname );
1059                 $this->mTrxLevel = 1;
1060         }
1061         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1062                 return true;
1063         }
1064         function commit( $fname = 'DatabasePostgres::commit' ) {
1065                 $this->query( 'COMMIT', $fname );
1066                 $this->mTrxLevel = 0;
1067         }
1068
1069         /* Not even sure why this is used in the main codebase... */
1070         function limitResultForUpdate($sql, $num) {
1071                 return $sql;
1072         }
1073
1074         function setup_database() {
1075                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1076
1077                 ## Make sure that we can write to the correct schema
1078                 ## If not, Postgres will happily and silently go to the next search_path item
1079                 $ctest = "mw_test_table";
1080                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1081                         $this->doQuery("DROP TABLE $wgDBmwschema.$ctest");
1082                 }
1083                 $SQL = "CREATE TABLE $wgDBmwschema.$ctest(a int)";
1084                 $olde = error_reporting( 0 );
1085                 $res = $this->doQuery($SQL);
1086                 error_reporting( $olde );
1087                 if (!$res) {
1088                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"</li>\n";
1089                         dieout("</ul>");
1090                 }
1091                 $this->doQuery("DROP TABLE $wgDBmwschema.mw_test_table");
1092
1093                 dbsource( "../maintenance/postgres/tables.sql", $this);
1094
1095                 ## Version-specific stuff
1096                 if ($this->numeric_version == 8.1) {
1097                         $this->doQuery("CREATE INDEX ts2_page_text ON pagecontent USING gist(textvector)");
1098                         $this->doQuery("CREATE INDEX ts2_page_title ON page USING gist(titlevector)");
1099                 }
1100                 else {
1101                         $this->doQuery("CREATE INDEX ts2_page_text ON pagecontent USING gin(textvector)");
1102                         $this->doQuery("CREATE INDEX ts2_page_title ON page USING gin(titlevector)");
1103                 }
1104
1105                 ## Update version information
1106                 $mwv = $this->addQuotes($wgVersion);
1107                 $pgv = $this->addQuotes($this->getServerVersion());
1108                 $pgu = $this->addQuotes($this->mUser);
1109                 $mws = $this->addQuotes($wgDBmwschema);
1110                 $tss = $this->addQuotes($wgDBts2schema);
1111                 $pgp = $this->addQuotes($wgDBport);
1112                 $dbn = $this->addQuotes($this->mDBname);
1113                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
1114
1115                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
1116                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
1117                                 "ctype = '$ctype' ".
1118                                 "WHERE type = 'Creation'";
1119                 $this->query($SQL);
1120
1121                 ## Avoid the non-standard "REPLACE INTO" syntax
1122                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1123                 if ($f == false ) {
1124                         dieout( "<li>Could not find the interwiki.sql file");
1125                 }
1126                 ## We simply assume it is already empty as we have just created it
1127                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1128                 while ( ! feof( $f ) ) {
1129                         $line = fgets($f,1024);
1130                         $matches = array();
1131                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1132                                 continue;
1133                         }
1134                         $this->query("$SQL $matches[1],$matches[2])");
1135                 }
1136                 print " (table interwiki successfully populated)...\n";
1137
1138                 $this->doQuery("COMMIT");
1139         }
1140
1141         function encodeBlob( $b ) {
1142                 return pg_escape_bytea( $b );
1143         }
1144         function decodeBlob( $b ) {
1145                 return pg_unescape_bytea( $b );
1146         }
1147
1148         function strencode( $s ) { ## Should not be called by us
1149                 return pg_escape_string( $s );
1150         }
1151
1152         function addQuotes( $s ) {
1153                 if ( is_null( $s ) ) {
1154                         return 'NULL';
1155                 } else if (is_array( $s )) { ## Assume it is bytea data
1156                         return "E'$s[1]'";
1157                 }
1158                 return "'" . pg_escape_string($s) . "'";
1159                 // Unreachable: return "E'" . pg_escape_string($s) . "'";
1160         }
1161
1162         function quote_ident( $s ) {
1163                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1164         }
1165
1166         /* For now, does nothing */
1167         function selectDB( $db ) {
1168                 return true;
1169         }
1170
1171         /**
1172          * Various select options
1173          *
1174          * @private
1175          *
1176          * @param array $options an associative array of options to be turned into
1177          *              an SQL query, valid keys are listed in the function.
1178          * @return array
1179          */
1180         function makeSelectOptions( $options ) {
1181                 $preLimitTail = $postLimitTail = '';
1182                 $startOpts = $useIndex = '';
1183
1184                 $noKeyOptions = array();
1185                 foreach ( $options as $key => $option ) {
1186                         if ( is_numeric( $key ) ) {
1187                                 $noKeyOptions[$option] = true;
1188                         }
1189                 }
1190
1191                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1192                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1193                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1194
1195                 //if (isset($options['LIMIT'])) {
1196                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1197                 //              isset($options['OFFSET']) ? $options['OFFSET']
1198                 //              : false);
1199                 //}
1200
1201                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1202                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1203                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1204
1205                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1206         }
1207
1208         public function setTimeout( $timeout ) {
1209                 // @todo fixme no-op
1210         }
1211
1212         function ping() {
1213                 wfDebug( "Function ping() not written for DatabasePostgres.php yet");
1214                 return true;
1215         }
1216
1217         /**
1218          * How lagged is this slave?
1219          *
1220          */
1221         public function getLag() {
1222                 # Not implemented for PostgreSQL
1223                 return false;
1224         }
1225
1226 } // end DatabasePostgres class
1227
1228