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
  20 CASE WHEN typname = 'int2' THEN 'smallint'
  21 WHEN typname = 'int4' THEN 'integer'
  22 WHEN typname = 'int8' THEN 'bigint'
  23 WHEN typname = 'bpchar' THEN 'char'
  24 ELSE typname END AS typname,
  25 attnotnull, attlen
  26 FROM pg_class, pg_namespace, pg_attribute, pg_type
  27 WHERE relnamespace=pg_namespace.oid
  28 AND relkind='r'
  29 AND attrelid=pg_class.oid
  30 AND atttypid=pg_type.oid
  31 AND nspname=%s
  32 AND relname=%s
  33 AND attname=%s;
  34 END;
  35                 $res = $db->query(sprintf($q,
  36                                 $db->addQuotes($wgDBmwschema),
  37                                 $db->addQuotes($table),
  38                                 $db->addQuotes($field)));
  39                 $row = $db->fetchObject($res);
  40                 if (!$row)
  41                         return null;
  42                 $n = new PostgresField;
  43                 $n->type = $row->typname;
  44                 $n->nullable = ($row->attnotnull == 'f');
  45                 $n->name = $field;
  46                 $n->tablename = $table;
  47                 $n->max_length = $row->attlen;
  48                 return $n;
  49         }
  50
  51         function name() {
  52                 return $this->name;
  53         }
  54
  55         function tableName() {
  56                 return $this->tablename;
  57         }
  58
  59         function type() {
  60                 return $this->type;
  61         }
  62
  63         function nullable() {
  64                 return $this->nullable;
  65         }
  66
  67         function maxLength() {
  68                 return $this->max_length;
  69         }
  70 }
  71
  72 /**
  73  * @addtogroup Database
  74  */
  75 class DatabasePostgres extends Database {
  76         var $mInsertId = NULL;
  77         var $mLastResult = NULL;
  78         var $numeric_version = NULL;
  79
  80         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  81                 $failFunction = false, $flags = 0 )
  82         {
  83
  84                 global $wgOut;
  85                 # Can't get a reference if it hasn't been set yet
  86                 if ( !isset( $wgOut ) ) {
  87                         $wgOut = NULL;
  88                 }
  89                 $this->mOut =& $wgOut;
  90                 $this->mFailFunction = $failFunction;
  91                 $this->mFlags = $flags;
  92                 $this->open( $server, $user, $password, $dbName);
  93
  94         }
  95
  96         function cascadingDeletes() {
  97                 return true;
  98         }
  99         function cleanupTriggers() {
 100                 return true;
 101         }
 102         function strictIPs() {
 103                 return true;
 104         }
 105         function realTimestamps() {
 106                 return true;
 107         }
 108         function implicitGroupby() {
 109                 return false;
 110         }
 111         function implicitOrderby() {
 112                 return false;
 113         }
 114         function searchableIPs() {
 115                 return true;
 116         }
 117         function functionalIndexes() {
 118                 return true;
 119         }
 120
 121         function hasConstraint( $name ) {
 122                 $SQL = "SELECT 1 FROM pg_catalog.pg_constraint WHERE conname = '" . pg_escape_string( $name ) . "'";
 123                 return $this->numRows($res = $this->doQuery($SQL));
 124         }
 125
 126         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 127         {
 128                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 129         }
 130
 131         /**
 132          * Usually aborts on failure
 133          * If the failFunction is set to a non-zero integer, returns success
 134          */
 135         function open( $server, $user, $password, $dbName ) {
 136                 # Test for Postgres support, to avoid suppressed fatal error
 137                 if ( !function_exists( 'pg_connect' ) ) {
 138                         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" );
 139                 }
 140
 141                 global $wgDBport;
 142
 143                 if (!strlen($user)) { ## e.g. the class is being loaded
 144                         return;
 145                 }
 146
 147                 $this->close();
 148                 $this->mServer = $server;
 149                 $port = $wgDBport;
 150                 $this->mUser = $user;
 151                 $this->mPassword = $password;
 152                 $this->mDBname = $dbName;
 153
 154                 $hstring="";
 155                 if ($server!=false && $server!="") {
 156                         $hstring="host=$server ";
 157                 }
 158                 if ($port!=false && $port!="") {
 159                         $hstring .= "port=$port ";
 160                 }
 161
 162
 163                 error_reporting( E_ALL );
 164                 @$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
 165
 166                 if ( $this->mConn == false ) {
 167                         wfDebug( "DB connection error\n" );
 168                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 169                         wfDebug( $this->lastError()."\n" );
 170                         return false;
 171                 }
 172
 173                 $this->mOpened = true;
 174                 ## If this is the initial connection, setup the schema stuff and possibly create the user
 175                 ## TODO: Move this out of open()
 176                 if (defined('MEDIAWIKI_INSTALL')) {
 177                         global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema,
 178                                 $wgDBts2schema;
 179
 180                         print "<li>Checking the version of Postgres...";
 181                         $version = $this->getServerVersion();
 182                         $PGMINVER = "8.1";
 183                         if ($this->numeric_version < $PGMINVER) {
 184                                 print "<b>FAILED</b>. Required version is $PGMINVER. You have $this->numeric_version ($version)</li>\n";
 185                                 dieout("</ul>");
 186                         }
 187                         print "version $this->numeric_version is OK.</li>\n";
 188
 189                         $safeuser = $this->quote_ident($wgDBuser);
 190                         ## Are we connecting as a superuser for the first time?
 191                         if ($wgDBsuperuser) {
 192                                 ## Are we really a superuser? Check out our rights
 193                                 $SQL = "SELECT
 194                                                 CASE WHEN usesuper IS TRUE THEN
 195                                                         CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 196                                                         ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 197                         END AS rights
 198                                                 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 199                                 $rows = $this->numRows($res = $this->doQuery($SQL));
 200                                 if (!$rows) {
 201                                         print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 202                                         dieout('</ul>');
 203                                 }
 204                                 $perms = pg_fetch_result($res, 0, 0);
 205
 206                                 $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 207                                 $rows = $this->numRows($this->doQuery($SQL));
 208                                 if ($rows) {
 209                                         print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 210                                 }
 211                                 else {
 212                                         if ($perms != 1 and $perms != 3) {
 213                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 214                                                 print 'Please use a different Postgres user.</li>';
 215                                                 dieout('</ul>');
 216                                         }
 217                                         print "<li>Creating user <b>$wgDBuser</b>...";
 218                                         $safepass = $this->addQuotes($wgDBpassword);
 219                                         $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 220                                         $this->doQuery($SQL);
 221                                         print "OK</li>\n";
 222                                 }
 223                                 ## User now exists, check out the database
 224                                 if ($dbName != $wgDBname) {
 225                                         $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 226                                         $rows = $this->numRows($this->doQuery($SQL));
 227                                         if ($rows) {
 228                                                 print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 229                                         }
 230                                         else {
 231                                                 if ($perms < 2) {
 232                                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 233                                                         print 'Please use a different Postgres user.</li>';
 234                                                         dieout('</ul>');
 235                                                 }
 236                                                 print "<li>Creating database <b>$wgDBname</b>...";
 237                                                 $safename = $this->quote_ident($wgDBname);
 238                                                 $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 239                                                 $this->doQuery($SQL);
 240                                                 print "OK</li>\n";
 241                                                 ## Hopefully tsearch2 and plpgsql are in template1...
 242                                         }
 243
 244                                         ## Reconnect to check out tsearch2 rights for this user
 245                                         print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 246                                         @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$user password=$password");
 247                                         if ( $this->mConn == false ) {
 248                                                 print "<b>FAILED TO CONNECT!</b></li>";
 249                                                 dieout("</ul>");
 250                                         }
 251                                         print "OK</li>\n";
 252                                 }
 253
 254                                 ## Tsearch2 checks
 255                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 256                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 257                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 258                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 259                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 260                                         dieout("</ul>");
 261                                 }
 262                                 print "OK</li>\n";
 263                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 264                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 265                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 266                                         $this->doQuery($SQL);
 267                                 }
 268                                 print "OK</li>\n";
 269
 270
 271                                 ## Setup the schema for this user if needed
 272                                 $result = $this->schemaExists($wgDBmwschema);
 273                                 $safeschema = $this->quote_ident($wgDBmwschema);
 274                                 if (!$result) {
 275                                         print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 276                                         $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 277                                         if (!$result) {
 278                                                 print "<b>FAILED</b>.</li>\n";
 279                                                 dieout("</ul>");
 280                                         }
 281                                         print "OK</li>\n";
 282                                 }
 283                                 else {
 284                                         print "<li>Schema already exists, explicitly granting rights...\n";
 285                                         $safeschema2 = $this->addQuotes($wgDBmwschema);
 286                                         $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 287                                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 288                                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 289                                                         "AND p.relkind IN ('r','S','v')\n";
 290                                         $SQL .= "UNION\n";
 291                                         $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 292                                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 293                                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 294                                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 295                                         $res = $this->doQuery($SQL);
 296                                         if (!$res) {
 297                                                 print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 298                                                 dieout("</ul>");
 299                                         }
 300                                         $this->doQuery("SET search_path = $safeschema");
 301                                         $rows = $this->numRows($res);
 302                                         while ($rows) {
 303                                                 $rows--;
 304                                                 $this->doQuery(pg_fetch_result($res, $rows, 0));
 305                                         }
 306                                         print "OK</li>";
 307                                 }
 308
 309                                 $wgDBsuperuser = '';
 310                                 return true; ## Reconnect as regular user
 311
 312                         } ## end superuser
 313
 314                 if (!defined('POSTGRES_SEARCHPATH')) {
 315
 316                         ## Do we have the basic tsearch2 table?
 317                         print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 318                         if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 319                                 print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 320                                 print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 321                                 print " for instructions.</li>\n";
 322                                 dieout("</ul>");
 323                         }
 324                         print "OK</li>\n";
 325
 326                         ## Does this user have the rights to the tsearch2 tables?
 327                         $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 328                         print "<li>Checking tsearch2 permissions...";
 329                         ## Let's check all four, just to be safe
 330                         error_reporting( 0 );
 331                         $ts2tables = array('cfg','cfgmap','dict','parser');
 332                         foreach ( $ts2tables AS $tname ) {
 333                                 $SQL = "SELECT count(*) FROM $wgDBts2schema.pg_ts_$tname";
 334                                 $res = $this->doQuery($SQL);
 335                                 if (!$res) {
 336                                         print "<b>FAILED</b> to access pg_ts_$tname. Make sure that the user ".
 337                                         "\"$wgDBuser\" has SELECT access to all four tsearch2 tables</li>\n";
 338                                         dieout("</ul>");
 339                                 }
 340                         }
 341                         $SQL = "SELECT ts_name FROM $wgDBts2schema.pg_ts_cfg WHERE locale = '$ctype'";
 342                         $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 343                         $res = $this->doQuery($SQL);
 344                         error_reporting( E_ALL );
 345                         if (!$res) {
 346                                 print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 347                                 dieout("</ul>");
 348                         }
 349                         print "OK</li>";
 350
 351                         ## Will the current locale work? Can we force it to?
 352                         print "<li>Verifying tsearch2 locale with $ctype...";
 353                         $rows = $this->numRows($res);
 354                         $resetlocale = 0;
 355                         if (!$rows) {
 356                                 print "<b>not found</b></li>\n";
 357                                 print "<li>Attempting to set default tsearch2 locale to \"$ctype\"...";
 358                                 $resetlocale = 1;
 359                         }
 360                         else {
 361                                 $tsname = pg_fetch_result($res, 0, 0);
 362                                 if ($tsname != 'default') {
 363                                         print "<b>not set to default ($tsname)</b>";
 364                                         print "<li>Attempting to change tsearch2 default locale to \"$ctype\"...";
 365                                         $resetlocale = 1;
 366                                 }
 367                         }
 368                         if ($resetlocale) {
 369                                 $SQL = "UPDATE $wgDBts2schema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
 370                                 $res = $this->doQuery($SQL);
 371                                 if (!$res) {
 372                                         print "<b>FAILED</b>. ";
 373                                         print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"</li>\n";
 374                                         dieout("</ul>");
 375                                 }
 376                                 print "OK</li>";
 377                         }
 378
 379                         ## Final test: try out a simple tsearch2 query
 380                         $SQL = "SELECT $wgDBts2schema.to_tsvector('default','MediaWiki tsearch2 testing')";
 381                         $res = $this->doQuery($SQL);
 382                         if (!$res) {
 383                                 print "<b>FAILED</b>. Specifically, \"$SQL\" did not work.</li>";
 384                                 dieout("</ul>");
 385                         }
 386                         print "OK</li>";
 387
 388                         ## Do we have plpgsql installed?
 389                         print "<li>Checking for Pl/Pgsql ...";
 390                         $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 391                         $rows = $this->numRows($this->doQuery($SQL));
 392                         if ($rows < 1) {
 393                                 // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 394                                 print "not installed. Attempting to install Pl/Pgsql ...";
 395                                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 396                                         "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 397                                 $rows = $this->numRows($this->doQuery($SQL));
 398                                 if ($rows >= 1) {
 399                                         $olde = error_reporting(0);
 400                                         error_reporting($olde - E_WARNING);
 401                                         $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 402                                         error_reporting($olde);
 403                                         if (!$result) {
 404                                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 405                                                 dieout("</ul>");
 406                                         }
 407                                 }
 408                                 else {
 409                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 410                                         dieout("</ul>");
 411                                 }
 412                         }
 413                         print "OK</li>\n";
 414
 415                         ## Does the schema already exist? Who owns it?
 416                         $result = $this->schemaExists($wgDBmwschema);
 417                         if (!$result) {
 418                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 419                                 error_reporting( 0 );
 420                                 $result = $this->doQuery("CREATE SCHEMA $wgDBmwschema");
 421                                 error_reporting( E_ALL );
 422                                 if (!$result) {
 423                                         print "<b>FAILED</b>. The user \"$wgDBuser\" must be able to access the schema. ".
 424                                         "You can try making them the owner of the database, or try creating the schema with a ".
 425                                         "different user, and then grant access to the \"$wgDBuser\" user.</li>\n";
 426                                         dieout("</ul>");
 427                                 }
 428                                 print "OK</li>\n";
 429                         }
 430                         else if ($result != $user) {
 431                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$user\". Not ideal.</li>\n";
 432                         }
 433                         else {
 434                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$user\". Excellent.</li>\n";
 435                         }
 436
 437                         ## Always return GMT time to accomodate the existing integer-based timestamp assumption
 438                         print "<li>Setting the timezone to GMT for user \"$user\" ...";
 439                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 440                         $result = pg_query($this->mConn, $SQL);
 441                         if (!$result) {
 442                                 print "<b>FAILED</b>.</li>\n";
 443                                 dieout("</ul>");
 444                         }
 445                         print "OK</li>\n";
 446                         ## Set for the rest of this session
 447                         $SQL = "SET timezone = 'GMT'";
 448                         $result = pg_query($this->mConn, $SQL);
 449                         if (!$result) {
 450                                 print "<li>Failed to set timezone</li>\n";
 451                                 dieout("</ul>");
 452                         }
 453
 454                         print "<li>Setting the datestyle to ISO, YMD for user \"$user\" ...";
 455                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 456                         $result = pg_query($this->mConn, $SQL);
 457                         if (!$result) {
 458                                 print "<b>FAILED</b>.</li>\n";
 459                                 dieout("</ul>");
 460                         }
 461                         print "OK</li>\n";
 462                         ## Set for the rest of this session
 463                         $SQL = "SET datestyle = 'ISO, YMD'";
 464                         $result = pg_query($this->mConn, $SQL);
 465                         if (!$result) {
 466                                 print "<li>Failed to set datestyle</li>\n";
 467                                 dieout("</ul>");
 468                         }
 469
 470                         ## Fix up the search paths if needed
 471                         print "<li>Setting the search path for user \"$user\" ...";
 472                         $path = $this->quote_ident($wgDBmwschema);
 473                         if ($wgDBts2schema !== $wgDBmwschema)
 474                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 475                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 476                                 $path .= ", public";
 477                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 478                         $result = pg_query($this->mConn, $SQL);
 479                         if (!$result) {
 480                                 print "<b>FAILED</b>.</li>\n";
 481                                 dieout("</ul>");
 482                         }
 483                         print "OK</li>\n";
 484                         ## Set for the rest of this session
 485                         $SQL = "SET search_path = $path";
 486                         $result = pg_query($this->mConn, $SQL);
 487                         if (!$result) {
 488                                 print "<li>Failed to set search_path</li>\n";
 489                                 dieout("</ul>");
 490                         }
 491                         define( "POSTGRES_SEARCHPATH", $path );
 492                 }}
 493
 494                 global $wgCommandLineMode;
 495                 ## If called from the command-line (e.g. importDump), only show errors
 496                 if ($wgCommandLineMode) {
 497                         $this->doQuery("SET client_min_messages = 'ERROR'");
 498                 }
 499
 500                 global $wgDBmwschema, $wgDBts2schema;
 501                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 502                         && $wgDBmwschema !== 'mediawiki'
 503                         && preg_match( '/^\w+$/', $wgDBmwschema )
 504                         && preg_match( '/^\w+$/', $wgDBts2schema )
 505                 ) {
 506                         $this->doQuery("SET search_path = $wgDBmwschema, $wgDBts2schema, public");
 507                 }
 508
 509                 return $this->mConn;
 510         }
 511
 512         /**
 513          * Closes a database connection, if it is open
 514          * Returns success, true if already closed
 515          */
 516         function close() {
 517                 $this->mOpened = false;
 518                 if ( $this->mConn ) {
 519                         return pg_close( $this->mConn );
 520                 } else {
 521                         return true;
 522                 }
 523         }
 524
 525         function doQuery( $sql ) {
 526                 return $this->mLastResult=pg_query( $this->mConn , $sql);
 527         }
 528
 529         function queryIgnore( $sql, $fname = '' ) {
 530                 return $this->query( $sql, $fname, true );
 531         }
 532
 533         function freeResult( $res ) {
 534                 if ( $res instanceof ResultWrapper ) {
 535                         $res = $res->result;
 536                 }
 537                 if ( !@pg_free_result( $res ) ) {
 538                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 539                 }
 540         }
 541
 542         function fetchObject( $res ) {
 543                 if ( $res instanceof ResultWrapper ) {
 544                         $res = $res->result;
 545                 }
 546                 @$row = pg_fetch_object( $res );
 547                 # FIXME: HACK HACK HACK HACK debug
 548
 549                 # TODO:
 550                 # hashar : not sure if the following test really trigger if the object
 551                 #          fetching failed.
 552                 if( pg_last_error($this->mConn) ) {
 553                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 554                 }
 555                 return $row;
 556         }
 557
 558         function fetchRow( $res ) {
 559                 if ( $res instanceof ResultWrapper ) {
 560                         $res = $res->result;
 561                 }
 562                 @$row = pg_fetch_array( $res );
 563                 if( pg_last_error($this->mConn) ) {
 564                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 565                 }
 566                 return $row;
 567         }
 568
 569         function numRows( $res ) {
 570                 if ( $res instanceof ResultWrapper ) {
 571                         $res = $res->result;
 572                 }
 573                 @$n = pg_num_rows( $res );
 574                 if( pg_last_error($this->mConn) ) {
 575                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 576                 }
 577                 return $n;
 578         }
 579         function numFields( $res ) {
 580                 if ( $res instanceof ResultWrapper ) {
 581                         $res = $res->result;
 582                 }
 583                 return pg_num_fields( $res );
 584         }
 585         function fieldName( $res, $n ) {
 586                 if ( $res instanceof ResultWrapper ) {
 587                         $res = $res->result;
 588                 }
 589                 return pg_field_name( $res, $n );
 590         }
 591
 592         /**
 593          * This must be called after nextSequenceVal
 594          */
 595         function insertId() {
 596                 return $this->mInsertId;
 597         }
 598
 599         function dataSeek( $res, $row ) {
 600                 if ( $res instanceof ResultWrapper ) {
 601                         $res = $res->result;
 602                 }
 603                 return pg_result_seek( $res, $row );
 604         }
 605
 606         function lastError() {
 607                 if ( $this->mConn ) {
 608                         return pg_last_error();
 609                 }
 610                 else {
 611                         return "No database connection";
 612                 }
 613         }
 614         function lastErrno() {
 615                 return pg_last_error() ? 1 : 0;
 616         }
 617
 618         function affectedRows() {
 619                 if( !isset( $this->mLastResult ) or ! $this->mLastResult )
 620                         return 0;
 621
 622                 return pg_affected_rows( $this->mLastResult );
 623         }
 624
 625         /**
 626          * Estimate rows in dataset
 627          * Returns estimated count, based on EXPLAIN output
 628          * This is not necessarily an accurate estimate, so use sparingly
 629          * Returns -1 if count cannot be found
 630          * Takes same arguments as Database::select()
 631          */
 632
 633         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
 634                 $options['EXPLAIN'] = true;
 635                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 636                 $rows = -1;
 637                 if ( $res ) {
 638                         $row = $this->fetchRow( $res );
 639                         $count = array();
 640                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 641                                 $rows = $count[1];
 642                         }
 643                         $this->freeResult($res);
 644                 }
 645                 return $rows;
 646         }
 647
 648
 649         /**
 650          * Returns information about an index
 651          * If errors are explicitly ignored, returns NULL on failure
 652          */
 653         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 654                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 655                 $res = $this->query( $sql, $fname );
 656                 if ( !$res ) {
 657                         return NULL;
 658                 }
 659                 while ( $row = $this->fetchObject( $res ) ) {
 660                         if ( $row->indexname == $index ) {
 661                                 return $row;
 662                         }
 663                 }
 664                 return false;
 665         }
 666
 667         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 668                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 669                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 670                 $res = $this->query( $sql, $fname );
 671                 if ( !$res )
 672                         return NULL;
 673                 while ($row = $this->fetchObject( $res ))
 674                         return true;
 675                 return false;
 676
 677         }
 678
 679         /**
 680          * INSERT wrapper, inserts an array into a table
 681          *
 682          * $args may be a single associative array, or an array of these with numeric keys,
 683          * for multi-row insert (Postgres version 8.2 and above only).
 684          *
 685          * @param array $table   String: Name of the table to insert to.
 686          * @param array $args    Array: Items to insert into the table.
 687          * @param array $fname   String: Name of the function, for profiling
 688          * @param mixed $options String or Array. Valid options: IGNORE
 689          *
 690          * @return bool Success of insert operation. IGNORE always returns true.
 691          */
 692         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 693                 global $wgDBversion;
 694
 695                 $table = $this->tableName( $table );
 696                 if (! isset( $wgDBversion ) ) {
 697                         $this->getServerVersion();
 698                         $wgDBversion = $this->numeric_version;
 699                 }
 700
 701                 if ( !is_array( $options ) )
 702                         $options = array( $options );
 703
 704                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 705                         $multi = true;
 706                         $keys = array_keys( $args[0] );
 707                 }
 708                 else {
 709                         $multi = false;
 710                         $keys = array_keys( $args );
 711                 }
 712
 713                 $ignore = in_array( 'IGNORE', $options ) ? 1 : 0;
 714                 if ( $ignore )
 715                         $olde = error_reporting( 0 );
 716
 717                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 718
 719                 if ( $multi ) {
 720                         if ( $wgDBversion >= 8.2 ) {
 721                                 $first = true;
 722                                 foreach ( $args as $row ) {
 723                                         if ( $first ) {
 724                                                 $first = false;
 725                                         } else {
 726                                                 $sql .= ',';
 727                                         }
 728                                         $sql .= '(' . $this->makeList( $row ) . ')';
 729                                 }
 730                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 731                         }
 732                         else {
 733                                 $res = true;
 734                                 $origsql = $sql;
 735                                 foreach ( $args as $row ) {
 736                                         $tempsql = $origsql;
 737                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 738                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 739                                         if (! $tempres)
 740                                                 $res = false;
 741                                 }
 742                         }
 743                 }
 744                 else {
 745                         $sql .= '(' . $this->makeList( $args ) . ')';
 746                         $res = (bool)$this->query( $sql, $fname, $ignore );
 747                 }
 748
 749                 if ( $ignore ) {
 750                         $olde = error_reporting( $olde );
 751                         return true;
 752                 }
 753
 754                 return $res;
 755
 756         }
 757
 758         function tableName( $name ) {
 759                 # Replace reserved words with better ones
 760                 switch( $name ) {
 761                         case 'user':
 762                                 return 'mwuser';
 763                         case 'text':
 764                                 return 'pagecontent';
 765                         default:
 766                                 return $name;
 767                 }
 768         }
 769
 770         /**
 771          * Return the next in a sequence, save the value for retrieval via insertId()
 772          */
 773         function nextSequenceValue( $seqName ) {
 774                 $safeseq = preg_replace( "/'/", "''", $seqName );
 775                 $res = $this->query( "SELECT nextval('$safeseq')" );
 776                 $row = $this->fetchRow( $res );
 777                 $this->mInsertId = $row[0];
 778                 $this->freeResult( $res );
 779                 return $this->mInsertId;
 780         }
 781
 782         /**
 783          * Postgres does not have a "USE INDEX" clause, so return an empty string
 784          */
 785         function useIndexClause( $index ) {
 786                 return '';
 787         }
 788
 789         # REPLACE query wrapper
 790         # Postgres simulates this with a DELETE followed by INSERT
 791         # $row is the row to insert, an associative array
 792         # $uniqueIndexes is an array of indexes. Each element may be either a
 793         # field name or an array of field names
 794         #
 795         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 796         # However if you do this, you run the risk of encountering errors which wouldn't have
 797         # occurred in MySQL
 798         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 799                 $table = $this->tableName( $table );
 800
 801                 if (count($rows)==0) {
 802                         return;
 803                 }
 804
 805                 # Single row case
 806                 if ( !is_array( reset( $rows ) ) ) {
 807                         $rows = array( $rows );
 808                 }
 809
 810                 foreach( $rows as $row ) {
 811                         # Delete rows which collide
 812                         if ( $uniqueIndexes ) {
 813                                 $sql = "DELETE FROM $table WHERE ";
 814                                 $first = true;
 815                                 foreach ( $uniqueIndexes as $index ) {
 816                                         if ( $first ) {
 817                                                 $first = false;
 818                                                 $sql .= "(";
 819                                         } else {
 820                                                 $sql .= ') OR (';
 821                                         }
 822                                         if ( is_array( $index ) ) {
 823                                                 $first2 = true;
 824                                                 foreach ( $index as $col ) {
 825                                                         if ( $first2 ) {
 826                                                                 $first2 = false;
 827                                                         } else {
 828                                                                 $sql .= ' AND ';
 829                                                         }
 830                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 831                                                 }
 832                                         } else {
 833                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 834                                         }
 835                                 }
 836                                 $sql .= ')';
 837                                 $this->query( $sql, $fname );
 838                         }
 839
 840                         # Now insert the row
 841                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 842                                 $this->makeList( $row, LIST_COMMA ) . ')';
 843                         $this->query( $sql, $fname );
 844                 }
 845         }
 846
 847         # DELETE where the condition is a join
 848         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 849                 if ( !$conds ) {
 850                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 851                 }
 852
 853                 $delTable = $this->tableName( $delTable );
 854                 $joinTable = $this->tableName( $joinTable );
 855                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 856                 if ( $conds != '*' ) {
 857                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 858                 }
 859                 $sql .= ')';
 860
 861                 $this->query( $sql, $fname );
 862         }
 863
 864         # Returns the size of a text field, or -1 for "unlimited"
 865         function textFieldSize( $table, $field ) {
 866                 $table = $this->tableName( $table );
 867                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 868                         FROM pg_class c, pg_attribute a, pg_type t
 869                         WHERE relname='$table' AND a.attrelid=c.oid AND
 870                                 a.atttypid=t.oid and a.attname='$field'";
 871                 $res =$this->query($sql);
 872                 $row=$this->fetchObject($res);
 873                 if ($row->ftype=="varchar") {
 874                         $size=$row->size-4;
 875                 } else {
 876                         $size=$row->size;
 877                 }
 878                 $this->freeResult( $res );
 879                 return $size;
 880         }
 881
 882         function lowPriorityOption() {
 883                 return '';
 884         }
 885
 886         function limitResult($sql, $limit,$offset=false) {
 887                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 888         }
 889
 890         /**
 891          * Returns an SQL expression for a simple conditional.
 892          * Uses CASE on Postgres
 893          *
 894          * @param string $cond SQL expression which will result in a boolean value
 895          * @param string $trueVal SQL expression to return if true
 896          * @param string $falseVal SQL expression to return if false
 897          * @return string SQL fragment
 898          */
 899         function conditional( $cond, $trueVal, $falseVal ) {
 900                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
 901         }
 902
 903         function wasDeadlock() {
 904                 return $this->lastErrno() == '40P01';
 905         }
 906
 907         function timestamp( $ts=0 ) {
 908                 return wfTimestamp(TS_POSTGRES,$ts);
 909         }
 910
 911         /**
 912          * Return aggregated value function call
 913          */
 914         function aggregateValue ($valuedata,$valuename='value') {
 915                 return $valuedata;
 916         }
 917
 918
 919         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 920                 # Ignore errors during error handling to avoid infinite recursion
 921                 $ignore = $this->ignoreErrors( true );
 922                 ++$this->mErrorCount;
 923
 924                 if ($ignore || $tempIgnore) {
 925                         wfDebug("SQL ERROR (ignored): $error\n");
 926                         $this->ignoreErrors( $ignore );
 927                 }
 928                 else {
 929                         $message = "A database error has occurred\n" .
 930                                 "Query: $sql\n" .
 931                                 "Function: $fname\n" .
 932                                 "Error: $errno $error\n";
 933                         throw new DBUnexpectedError($this, $message);
 934                 }
 935         }
 936
 937         /**
 938          * @return string wikitext of a link to the server software's web site
 939          */
 940         function getSoftwareLink() {
 941                 return "[http://www.postgresql.org/ PostgreSQL]";
 942         }
 943
 944         /**
 945          * @return string Version information from the database
 946          */
 947         function getServerVersion() {
 948                 $version = pg_fetch_result($this->doQuery("SELECT version()"),0,0);
 949                 $thisver = array();
 950                 if (!preg_match('/PostgreSQL (\d+\.\d+)(\S+)/', $version, $thisver)) {
 951                         die("Could not determine the numeric version from $version!");
 952                 }
 953                 $this->numeric_version = $thisver[1];
 954                 return $version;
 955         }
 956
 957
 958         /**
 959          * Query whether a given relation exists (in the given schema, or the
 960          * default mw one if not given)
 961          */
 962         function relationExists( $table, $types, $schema = false ) {
 963                 global $wgDBmwschema;
 964                 if (!is_array($types))
 965                         $types = array($types);
 966                 if (! $schema )
 967                         $schema = $wgDBmwschema;
 968                 $etable = $this->addQuotes($table);
 969                 $eschema = $this->addQuotes($schema);
 970                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
 971                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
 972                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
 973                 $res = $this->query( $SQL );
 974                 $count = $res ? $res->numRows() : 0;
 975                 if ($res)
 976                         $this->freeResult( $res );
 977                 return $count ? true : false;
 978         }
 979
 980         /*
 981          * For backward compatibility, this function checks both tables and
 982          * views.
 983          */
 984         function tableExists ($table, $schema = false) {
 985                 return $this->relationExists($table, array('r', 'v'), $schema);
 986         }
 987
 988         function sequenceExists ($sequence, $schema = false) {
 989                 return $this->relationExists($sequence, 'S', $schema);
 990         }
 991
 992         function triggerExists($table, $trigger) {
 993                 global $wgDBmwschema;
 994
 995                 $q = <<<END
 996         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
 997                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
 998                       AND tgrelid=pg_class.oid
 999                       AND nspname=%s AND relname=%s AND tgname=%s
1000 END;
1001                 $res = $this->query(sprintf($q,
1002                                 $this->addQuotes($wgDBmwschema),
1003                                 $this->addQuotes($table),
1004                                 $this->addQuotes($trigger)));
1005                 if (!$res)
1006                         return NULL;
1007                 $rows = $res->numRows();
1008                 $this->freeResult($res);
1009                 return $rows;
1010         }
1011
1012         function ruleExists($table, $rule) {
1013                 global $wgDBmwschema;
1014                 $exists = $this->selectField("pg_rules", "rulename",
1015                                 array(  "rulename" => $rule,
1016                                         "tablename" => $table,
1017                                         "schemaname" => $wgDBmwschema));
1018                 return $exists === $rule;
1019         }
1020
1021         function constraintExists($table, $constraint) {
1022                 global $wgDBmwschema;
1023                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1024                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1025                         $this->addQuotes($wgDBmwschema),
1026                         $this->addQuotes($table),
1027                         $this->addQuotes($constraint));
1028                 $res = $this->query($SQL);
1029                 if (!$res)
1030                         return NULL;
1031                 $rows = $res->numRows();
1032                 $this->freeResult($res);
1033                 return $rows;
1034         }
1035
1036         /**
1037          * Query whether a given schema exists. Returns the name of the owner
1038          */
1039         function schemaExists( $schema ) {
1040                 $eschema = preg_replace("/'/", "''", $schema);
1041                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1042                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1043                 $res = $this->query( $SQL );
1044                 if ( $res && $res->numRows() ) {
1045                         $row = $res->fetchObject();
1046                         $owner = $row->rolname;
1047                 } else {
1048                         $owner = false;
1049                 }
1050                 if ($res)
1051                         $this->freeResult($res);
1052                 return $owner;
1053         }
1054
1055         /**
1056          * Query whether a given column exists in the mediawiki schema
1057          */
1058         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1059                 global $wgDBmwschema;
1060                 $etable = preg_replace("/'/", "''", $table);
1061                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1062                 $ecol = preg_replace("/'/", "''", $field);
1063                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1064                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1065                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1066                 $res = $this->query( $SQL, $fname );
1067                 $count = $res ? $res->numRows() : 0;
1068                 if ($res)
1069                         $this->freeResult( $res );
1070                 return $count;
1071         }
1072
1073         function fieldInfo( $table, $field ) {
1074                 return PostgresField::fromText($this, $table, $field);
1075         }
1076
1077         function begin( $fname = 'DatabasePostgres::begin' ) {
1078                 $this->query( 'BEGIN', $fname );
1079                 $this->mTrxLevel = 1;
1080         }
1081         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1082                 return true;
1083         }
1084         function commit( $fname = 'DatabasePostgres::commit' ) {
1085                 $this->query( 'COMMIT', $fname );
1086                 $this->mTrxLevel = 0;
1087         }
1088
1089         /* Not even sure why this is used in the main codebase... */
1090         function limitResultForUpdate($sql, $num) {
1091                 return $sql;
1092         }
1093
1094         function setup_database() {
1095                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1096
1097                 ## Make sure that we can write to the correct schema
1098                 ## If not, Postgres will happily and silently go to the next search_path item
1099                 $ctest = "mw_test_table";
1100                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1101                         $this->doQuery("DROP TABLE $wgDBmwschema.$ctest");
1102                 }
1103                 $SQL = "CREATE TABLE $wgDBmwschema.$ctest(a int)";
1104                 $olde = error_reporting( 0 );
1105                 $res = $this->doQuery($SQL);
1106                 error_reporting( $olde );
1107                 if (!$res) {
1108                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"</li>\n";
1109                         dieout("</ul>");
1110                 }
1111                 $this->doQuery("DROP TABLE $wgDBmwschema.mw_test_table");
1112
1113                 dbsource( "../maintenance/postgres/tables.sql", $this);
1114
1115                 ## Version-specific stuff
1116                 if ($this->numeric_version == 8.1) {
1117                         $this->doQuery("CREATE INDEX ts2_page_text ON pagecontent USING gist(textvector)");
1118                         $this->doQuery("CREATE INDEX ts2_page_title ON page USING gist(titlevector)");
1119                 }
1120                 else {
1121                         $this->doQuery("CREATE INDEX ts2_page_text ON pagecontent USING gin(textvector)");
1122                         $this->doQuery("CREATE INDEX ts2_page_title ON page USING gin(titlevector)");
1123                 }
1124
1125                 ## Update version information
1126                 $mwv = $this->addQuotes($wgVersion);
1127                 $pgv = $this->addQuotes($this->getServerVersion());
1128                 $pgu = $this->addQuotes($this->mUser);
1129                 $mws = $this->addQuotes($wgDBmwschema);
1130                 $tss = $this->addQuotes($wgDBts2schema);
1131                 $pgp = $this->addQuotes($wgDBport);
1132                 $dbn = $this->addQuotes($this->mDBname);
1133                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
1134
1135                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
1136                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
1137                                 "ctype = '$ctype' ".
1138                                 "WHERE type = 'Creation'";
1139                 $this->query($SQL);
1140
1141                 ## Avoid the non-standard "REPLACE INTO" syntax
1142                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1143                 if ($f == false ) {
1144                         dieout( "<li>Could not find the interwiki.sql file");
1145                 }
1146                 ## We simply assume it is already empty as we have just created it
1147                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1148                 while ( ! feof( $f ) ) {
1149                         $line = fgets($f,1024);
1150                         $matches = array();
1151                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1152                                 continue;
1153                         }
1154                         $this->query("$SQL $matches[1],$matches[2])");
1155                 }
1156                 print " (table interwiki successfully populated)...\n";
1157
1158                 $this->doQuery("COMMIT");
1159         }
1160
1161         function encodeBlob( $b ) {
1162                 return new Blob ( pg_escape_bytea( $b ) ) ;
1163         }
1164
1165         function decodeBlob( $b ) {
1166                 if ($b instanceof Blob) {
1167                         $b = $b->fetch();
1168                 }
1169                 return pg_unescape_bytea( $b );
1170         }
1171
1172         function strencode( $s ) { ## Should not be called by us
1173                 return pg_escape_string( $s );
1174         }
1175
1176         function addQuotes( $s ) {
1177                 if ( is_null( $s ) ) {
1178                         return 'NULL';
1179                 } else if ($s instanceof Blob) {
1180                         return "'".$s->fetch($s)."'";
1181                 }
1182                 return "'" . pg_escape_string($s) . "'";
1183         }
1184
1185         function quote_ident( $s ) {
1186                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1187         }
1188
1189         /* For now, does nothing */
1190         function selectDB( $db ) {
1191                 return true;
1192         }
1193
1194         /**
1195          * Various select options
1196          *
1197          * @private
1198          *
1199          * @param array $options an associative array of options to be turned into
1200          *              an SQL query, valid keys are listed in the function.
1201          * @return array
1202          */
1203         function makeSelectOptions( $options ) {
1204                 $preLimitTail = $postLimitTail = '';
1205                 $startOpts = $useIndex = '';
1206
1207                 $noKeyOptions = array();
1208                 foreach ( $options as $key => $option ) {
1209                         if ( is_numeric( $key ) ) {
1210                                 $noKeyOptions[$option] = true;
1211                         }
1212                 }
1213
1214                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1215                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1216                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1217
1218                 //if (isset($options['LIMIT'])) {
1219                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1220                 //              isset($options['OFFSET']) ? $options['OFFSET']
1221                 //              : false);
1222                 //}
1223
1224                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1225                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1226                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1227
1228                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1229         }
1230
1231         public function setTimeout( $timeout ) {
1232                 // @todo fixme no-op
1233         }
1234
1235         function ping() {
1236                 wfDebug( "Function ping() not written for DatabasePostgres.php yet");
1237                 return true;
1238         }
1239
1240         /**
1241          * How lagged is this slave?
1242          *
1243          */
1244         public function getLag() {
1245                 # Not implemented for PostgreSQL
1246                 return false;
1247         }
1248
1249         function buildConcat( $stringList ) {
1250                 return implode( ' || ', $stringList );
1251         }
1252
1253 } // end DatabasePostgres class
1254
1255