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