includes/db/DatabasePostgres.php

   1 <?php
   2 /**
   3  * @ingroup Database
   4  * @file
   5  */
   6
   7 /**
   8  * This is the Postgres database abstraction layer.
   9  *
  10  * As it includes more generic version for DB functions,
  11  * than MySQL ones, some of them should be moved to parent
  12  * Database class.
  13  *
  14  * @ingroup Database
  15  */
  16 class PostgresField {
  17         private $name, $tablename, $type, $nullable, $max_length;
  18
  19         static function fromText($db, $table, $field) {
  20         global $wgDBmwschema;
  21
  22                 $q = <<<END
  23 SELECT
  24 CASE WHEN typname = 'int2' THEN 'smallint'
  25 WHEN typname = 'int4' THEN 'integer'
  26 WHEN typname = 'int8' THEN 'bigint'
  27 WHEN typname = 'bpchar' THEN 'char'
  28 ELSE typname END AS typname,
  29 attnotnull, attlen
  30 FROM pg_class, pg_namespace, pg_attribute, pg_type
  31 WHERE relnamespace=pg_namespace.oid
  32 AND relkind='r'
  33 AND attrelid=pg_class.oid
  34 AND atttypid=pg_type.oid
  35 AND nspname=%s
  36 AND relname=%s
  37 AND attname=%s;
  38 END;
  39                 $res = $db->query(sprintf($q,
  40                                 $db->addQuotes($wgDBmwschema),
  41                                 $db->addQuotes($table),
  42                                 $db->addQuotes($field)));
  43                 $row = $db->fetchObject($res);
  44                 if (!$row)
  45                         return null;
  46                 $n = new PostgresField;
  47                 $n->type = $row->typname;
  48                 $n->nullable = ($row->attnotnull == 'f');
  49                 $n->name = $field;
  50                 $n->tablename = $table;
  51                 $n->max_length = $row->attlen;
  52                 return $n;
  53         }
  54
  55         function name() {
  56                 return $this->name;
  57         }
  58
  59         function tableName() {
  60                 return $this->tablename;
  61         }
  62
  63         function type() {
  64                 return $this->type;
  65         }
  66
  67         function nullable() {
  68                 return $this->nullable;
  69         }
  70
  71         function maxLength() {
  72                 return $this->max_length;
  73         }
  74 }
  75
  76 /**
  77  * @ingroup Database
  78  */
  79 class DatabasePostgres extends Database {
  80         var $mInsertId = NULL;
  81         var $mLastResult = NULL;
  82         var $numeric_version = NULL;
  83
  84         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  85                 $failFunction = false, $flags = 0 )
  86         {
  87
  88                 global $wgOut;
  89                 # Can't get a reference if it hasn't been set yet
  90                 if ( !isset( $wgOut ) ) {
  91                         $wgOut = NULL;
  92                 }
  93                 $this->mOut =& $wgOut;
  94                 $this->mFailFunction = $failFunction;
  95                 $this->mFlags = $flags;
  96                 $this->open( $server, $user, $password, $dbName);
  97
  98         }
  99
 100         function cascadingDeletes() {
 101                 return true;
 102         }
 103         function cleanupTriggers() {
 104                 return true;
 105         }
 106         function strictIPs() {
 107                 return true;
 108         }
 109         function realTimestamps() {
 110                 return true;
 111         }
 112         function implicitGroupby() {
 113                 return false;
 114         }
 115         function implicitOrderby() {
 116                 return false;
 117         }
 118         function searchableIPs() {
 119                 return true;
 120         }
 121         function functionalIndexes() {
 122                 return true;
 123         }
 124
 125         function hasConstraint( $name ) {
 126                 global $wgDBmwschema;
 127                 $SQL = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n WHERE c.connamespace = n.oid AND conname = '" . pg_escape_string( $name ) . "' AND n.nspname = '" . pg_escape_string($wgDBmwschema) ."'";
 128                 return $this->numRows($res = $this->doQuery($SQL));
 129         }
 130
 131         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 132         {
 133                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 134         }
 135
 136         /**
 137          * Usually aborts on failure
 138          * If the failFunction is set to a non-zero integer, returns success
 139          */
 140         function open( $server, $user, $password, $dbName ) {
 141                 # Test for Postgres support, to avoid suppressed fatal error
 142                 if ( !function_exists( 'pg_connect' ) ) {
 143                         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" );
 144                 }
 145
 146                 global $wgDBport;
 147
 148                 if (!strlen($user)) { ## e.g. the class is being loaded
 149                         return;
 150                 }
 151
 152                 $this->close();
 153                 $this->mServer = $server;
 154                 $this->mPort = $port = $wgDBport;
 155                 $this->mUser = $user;
 156                 $this->mPassword = $password;
 157                 $this->mDBname = $dbName;
 158
 159                 $hstring="";
 160                 if ($server!=false && $server!="") {
 161                         $hstring="host=$server ";
 162                 }
 163                 if ($port!=false && $port!="") {
 164                         $hstring .= "port=$port ";
 165                 }
 166
 167                 error_reporting( E_ALL );
 168                 @$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
 169
 170                 if ( $this->mConn == false ) {
 171                         wfDebug( "DB connection error\n" );
 172                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 173                         wfDebug( $this->lastError()."\n" );
 174                         return false;
 175                 }
 176
 177                 $this->mOpened = true;
 178
 179                 global $wgCommandLineMode;
 180                 ## If called from the command-line (e.g. importDump), only show errors
 181                 if ($wgCommandLineMode) {
 182                         $this->doQuery("SET client_min_messages = 'ERROR'");
 183                 }
 184
 185                 global $wgDBmwschema, $wgDBts2schema;
 186                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 187                         && $wgDBmwschema !== 'mediawiki'
 188                         && preg_match( '/^\w+$/', $wgDBmwschema )
 189                         && preg_match( '/^\w+$/', $wgDBts2schema )
 190                 ) {
 191                         $safeschema = $this->quote_ident($wgDBmwschema);
 192                         $safeschema2 = $this->quote_ident($wgDBts2schema);
 193                         $this->doQuery("SET search_path = $safeschema, $wgDBts2schema, public");
 194                 }
 195
 196                 return $this->mConn;
 197         }
 198
 199
 200         function initial_setup($password, $dbName) {
 201                 // If this is the initial connection, setup the schema stuff and possibly create the user
 202                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
 203
 204                 print "<li>Checking the version of Postgres...";
 205                 $version = $this->getServerVersion();
 206                 $PGMINVER = '8.1';
 207                 if ($this->numeric_version < $PGMINVER) {
 208                         print "<b>FAILED</b>. Required version is $PGMINVER. You have $this->numeric_version ($version)</li>\n";
 209                         dieout("</ul>");
 210                 }
 211                 print "version $this->numeric_version is OK.</li>\n";
 212
 213                 $safeuser = $this->quote_ident($wgDBuser);
 214                 // Are we connecting as a superuser for the first time?
 215                 if ($wgDBsuperuser) {
 216                         // Are we really a superuser? Check out our rights
 217                         $SQL = "SELECT
 218                       CASE WHEN usesuper IS TRUE THEN
 219                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 220                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 221                     END AS rights
 222                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 223                         $rows = $this->numRows($res = $this->doQuery($SQL));
 224                         if (!$rows) {
 225                                 print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 226                                 dieout('</ul>');
 227                         }
 228                         $perms = pg_fetch_result($res, 0, 0);
 229
 230                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 231                         $rows = $this->numRows($this->doQuery($SQL));
 232                         if ($rows) {
 233                                 print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 234                         }
 235                         else {
 236                                 if ($perms != 1 and $perms != 3) {
 237                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 238                                         print 'Please use a different Postgres user.</li>';
 239                                         dieout('</ul>');
 240                                 }
 241                                 print "<li>Creating user <b>$wgDBuser</b>...";
 242                                 $safepass = $this->addQuotes($wgDBpassword);
 243                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 244                                 $this->doQuery($SQL);
 245                                 print "OK</li>\n";
 246                         }
 247                         // User now exists, check out the database
 248                         if ($dbName != $wgDBname) {
 249                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 250                                 $rows = $this->numRows($this->doQuery($SQL));
 251                                 if ($rows) {
 252                                         print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 253                                 }
 254                                 else {
 255                                         if ($perms < 2) {
 256                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 257                                                 print 'Please use a different Postgres user.</li>';
 258                                                 dieout('</ul>');
 259                                         }
 260                                         print "<li>Creating database <b>$wgDBname</b>...";
 261                                         $safename = $this->quote_ident($wgDBname);
 262                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 263                                         $this->doQuery($SQL);
 264                                         print "OK</li>\n";
 265                                         // Hopefully tsearch2 and plpgsql are in template1...
 266                                 }
 267
 268                                 // Reconnect to check out tsearch2 rights for this user
 269                                 print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 270
 271                                 $hstring="";
 272                                 if ($this->mServer!=false && $this->mServer!="") {
 273                                         $hstring="host=$this->mServer ";
 274                                 }
 275                                 if ($this->mPort!=false && $this->mPort!="") {
 276                                         $hstring .= "port=$this->mPort ";
 277                                 }
 278
 279                                 @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$wgDBsuperuser password=$password");
 280                                 if ( $this->mConn == false ) {
 281                                         print "<b>FAILED TO CONNECT!</b></li>";
 282                                         dieout("</ul>");
 283                                 }
 284                                 print "OK</li>\n";
 285                         }
 286
 287                         if ($this->numeric_version < 8.3) {
 288                                 // Tsearch2 checks
 289                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 290                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 291                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 292                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 293                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 294                                         dieout("</ul>");
 295                                 }
 296                                 print "OK</li>\n";
 297                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 298                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 299                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 300                                         $this->doQuery($SQL);
 301                                 }
 302                                 print "OK</li>\n";
 303                         }
 304
 305                         // Setup the schema for this user if needed
 306                         $result = $this->schemaExists($wgDBmwschema);
 307                         $safeschema = $this->quote_ident($wgDBmwschema);
 308                         if (!$result) {
 309                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 310                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 311                                 if (!$result) {
 312                                         print "<b>FAILED</b>.</li>\n";
 313                                         dieout("</ul>");
 314                                 }
 315                                 print "OK</li>\n";
 316                         }
 317                         else {
 318                                 print "<li>Schema already exists, explicitly granting rights...\n";
 319                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 320                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 321                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 322                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 323                                         "AND p.relkind IN ('r','S','v')\n";
 324                                 $SQL .= "UNION\n";
 325                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 326                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 327                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 328                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 329                                 $res = $this->doQuery($SQL);
 330                                 if (!$res) {
 331                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 332                                         dieout("</ul>");
 333                                 }
 334                                 $this->doQuery("SET search_path = $safeschema");
 335                                 $rows = $this->numRows($res);
 336                                 while ($rows) {
 337                                         $rows--;
 338                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 339                                 }
 340                                 print "OK</li>";
 341                         }
 342
 343                         // Install plpgsql if needed
 344                         $this->setup_plpgsql();
 345
 346                         $wgDBsuperuser = '';
 347                         return true; // Reconnect as regular user
 348
 349                 } // end superuser
 350
 351                 if (!defined('POSTGRES_SEARCHPATH')) {
 352
 353                         if ($this->numeric_version < 8.3) {
 354                                 // Do we have the basic tsearch2 table?
 355                                 print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 356                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 357                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 358                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 359                                         print " for instructions.</li>\n";
 360                                         dieout("</ul>");
 361                                 }
 362                                 print "OK</li>\n";
 363
 364                                 // Does this user have the rights to the tsearch2 tables?
 365                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 366                                 print "<li>Checking tsearch2 permissions...";
 367                                 // Let's check all four, just to be safe
 368                                 error_reporting( 0 );
 369                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 370                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 371                                 foreach ( $ts2tables AS $tname ) {
 372                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 373                                         $res = $this->doQuery($SQL);
 374                                         if (!$res) {
 375                                                 print "<b>FAILED</b> to access pg_ts_$tname. Make sure that the user ".
 376                                                         "\"$wgDBuser\" has SELECT access to all four tsearch2 tables</li>\n";
 377                                                 dieout("</ul>");
 378                                         }
 379                                 }
 380                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = '$ctype'";
 381                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 382                                 $res = $this->doQuery($SQL);
 383                                 error_reporting( E_ALL );
 384                                 if (!$res) {
 385                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 386                                         dieout("</ul>");
 387                                 }
 388                                 print "OK</li>";
 389
 390                                 // Will the current locale work? Can we force it to?
 391                                 print "<li>Verifying tsearch2 locale with $ctype...";
 392                                 $rows = $this->numRows($res);
 393                                 $resetlocale = 0;
 394                                 if (!$rows) {
 395                                         print "<b>not found</b></li>\n";
 396                                         print "<li>Attempting to set default tsearch2 locale to \"$ctype\"...";
 397                                         $resetlocale = 1;
 398                                 }
 399                                 else {
 400                                         $tsname = pg_fetch_result($res, 0, 0);
 401                                         if ($tsname != 'default') {
 402                                                 print "<b>not set to default ($tsname)</b>";
 403                                                 print "<li>Attempting to change tsearch2 default locale to \"$ctype\"...";
 404                                                 $resetlocale = 1;
 405                                         }
 406                                 }
 407                                 if ($resetlocale) {
 408                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
 409                                         $res = $this->doQuery($SQL);
 410                                         if (!$res) {
 411                                                 print "<b>FAILED</b>. ";
 412                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"</li>\n";
 413                                                 dieout("</ul>");
 414                                         }
 415                                         print "OK</li>";
 416                                 }
 417
 418                                 // Final test: try out a simple tsearch2 query
 419                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 420                                 $res = $this->doQuery($SQL);
 421                                 if (!$res) {
 422                                         print "<b>FAILED</b>. Specifically, \"$SQL\" did not work.</li>";
 423                                         dieout("</ul>");
 424                                 }
 425                                 print "OK</li>";
 426                         }
 427
 428                         // Install plpgsql if needed
 429                         $this->setup_plpgsql();
 430
 431                         // Does the schema already exist? Who owns it?
 432                         $result = $this->schemaExists($wgDBmwschema);
 433                         if (!$result) {
 434                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 435                                 error_reporting( 0 );
 436                                 $safeschema = $this->quote_ident($wgDBmwschema);
 437                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 438                                 error_reporting( E_ALL );
 439                                 if (!$result) {
 440                                         print "<b>FAILED</b>. The user \"$wgDBuser\" must be able to access the schema. ".
 441                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 442                                                 "different user, and then grant access to the \"$wgDBuser\" user.</li>\n";
 443                                         dieout("</ul>");
 444                                 }
 445                                 print "OK</li>\n";
 446                         }
 447                         else if ($result != $wgDBuser) {
 448                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$wgDBuser\". Not ideal.</li>\n";
 449                         }
 450                         else {
 451                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$wgDBuser\". Excellent.</li>\n";
 452                         }
 453
 454                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 455                         print "<li>Setting the timezone to GMT for user \"$wgDBuser\" ...";
 456                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 457                         $result = pg_query($this->mConn, $SQL);
 458                         if (!$result) {
 459                                 print "<b>FAILED</b>.</li>\n";
 460                                 dieout("</ul>");
 461                         }
 462                         print "OK</li>\n";
 463                         // Set for the rest of this session
 464                         $SQL = "SET timezone = 'GMT'";
 465                         $result = pg_query($this->mConn, $SQL);
 466                         if (!$result) {
 467                                 print "<li>Failed to set timezone</li>\n";
 468                                 dieout("</ul>");
 469                         }
 470
 471                         print "<li>Setting the datestyle to ISO, YMD for user \"$wgDBuser\" ...";
 472                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 473                         $result = pg_query($this->mConn, $SQL);
 474                         if (!$result) {
 475                                 print "<b>FAILED</b>.</li>\n";
 476                                 dieout("</ul>");
 477                         }
 478                         print "OK</li>\n";
 479                         // Set for the rest of this session
 480                         $SQL = "SET datestyle = 'ISO, YMD'";
 481                         $result = pg_query($this->mConn, $SQL);
 482                         if (!$result) {
 483                                 print "<li>Failed to set datestyle</li>\n";
 484                                 dieout("</ul>");
 485                         }
 486
 487                         // Fix up the search paths if needed
 488                         print "<li>Setting the search path for user \"$wgDBuser\" ...";
 489                         $path = $this->quote_ident($wgDBmwschema);
 490                         if ($wgDBts2schema !== $wgDBmwschema)
 491                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 492                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 493                                 $path .= ", public";
 494                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 495                         $result = pg_query($this->mConn, $SQL);
 496                         if (!$result) {
 497                                 print "<b>FAILED</b>.</li>\n";
 498                                 dieout("</ul>");
 499                         }
 500                         print "OK</li>\n";
 501                         // Set for the rest of this session
 502                         $SQL = "SET search_path = $path";
 503                         $result = pg_query($this->mConn, $SQL);
 504                         if (!$result) {
 505                                 print "<li>Failed to set search_path</li>\n";
 506                                 dieout("</ul>");
 507                         }
 508                         define( "POSTGRES_SEARCHPATH", $path );
 509                 }
 510         }
 511
 512
 513         function setup_plpgsql() {
 514                 print "<li>Checking for Pl/Pgsql ...";
 515                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 516                 $rows = $this->numRows($this->doQuery($SQL));
 517                 if ($rows < 1) {
 518                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 519                         print "not installed. Attempting to install Pl/Pgsql ...";
 520                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 521                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 522                         $rows = $this->numRows($this->doQuery($SQL));
 523                         if ($rows >= 1) {
 524                         $olde = error_reporting(0);
 525                                 error_reporting($olde - E_WARNING);
 526                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 527                                 error_reporting($olde);
 528                                 if (!$result) {
 529                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 530                                         dieout("</ul>");
 531                                 }
 532                         }
 533                         else {
 534                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 535                                 dieout("</ul>");
 536                         }
 537                 }
 538                 print "OK</li>\n";
 539         }
 540
 541
 542         /**
 543          * Closes a database connection, if it is open
 544          * Returns success, true if already closed
 545          */
 546         function close() {
 547                 $this->mOpened = false;
 548                 if ( $this->mConn ) {
 549                         return pg_close( $this->mConn );
 550                 } else {
 551                         return true;
 552                 }
 553         }
 554
 555         function doQuery( $sql ) {
 556                 if (function_exists('mb_convert_encoding')) {
 557                         return $this->mLastResult=pg_query( $this->mConn , mb_convert_encoding($sql,'UTF-8') );
 558                 }
 559                 return $this->mLastResult=pg_query( $this->mConn , $sql);
 560         }
 561
 562         function queryIgnore( $sql, $fname = '' ) {
 563                 return $this->query( $sql, $fname, true );
 564         }
 565
 566         function freeResult( $res ) {
 567                 if ( $res instanceof ResultWrapper ) {
 568                         $res = $res->result;
 569                 }
 570                 if ( !@pg_free_result( $res ) ) {
 571                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 572                 }
 573         }
 574
 575         function fetchObject( $res ) {
 576                 if ( $res instanceof ResultWrapper ) {
 577                         $res = $res->result;
 578                 }
 579                 @$row = pg_fetch_object( $res );
 580                 # FIXME: HACK HACK HACK HACK debug
 581
 582                 # TODO:
 583                 # hashar : not sure if the following test really trigger if the object
 584                 #          fetching failed.
 585                 if( pg_last_error($this->mConn) ) {
 586                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 587                 }
 588                 return $row;
 589         }
 590
 591         function fetchRow( $res ) {
 592                 if ( $res instanceof ResultWrapper ) {
 593                         $res = $res->result;
 594                 }
 595                 @$row = pg_fetch_array( $res );
 596                 if( pg_last_error($this->mConn) ) {
 597                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 598                 }
 599                 return $row;
 600         }
 601
 602         function numRows( $res ) {
 603                 if ( $res instanceof ResultWrapper ) {
 604                         $res = $res->result;
 605                 }
 606                 @$n = pg_num_rows( $res );
 607                 if( pg_last_error($this->mConn) ) {
 608                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 609                 }
 610                 return $n;
 611         }
 612         function numFields( $res ) {
 613                 if ( $res instanceof ResultWrapper ) {
 614                         $res = $res->result;
 615                 }
 616                 return pg_num_fields( $res );
 617         }
 618         function fieldName( $res, $n ) {
 619                 if ( $res instanceof ResultWrapper ) {
 620                         $res = $res->result;
 621                 }
 622                 return pg_field_name( $res, $n );
 623         }
 624
 625         /**
 626          * This must be called after nextSequenceVal
 627          */
 628         function insertId() {
 629                 return $this->mInsertId;
 630         }
 631
 632         function dataSeek( $res, $row ) {
 633                 if ( $res instanceof ResultWrapper ) {
 634                         $res = $res->result;
 635                 }
 636                 return pg_result_seek( $res, $row );
 637         }
 638
 639         function lastError() {
 640                 if ( $this->mConn ) {
 641                         return pg_last_error();
 642                 }
 643                 else {
 644                         return "No database connection";
 645                 }
 646         }
 647         function lastErrno() {
 648                 return pg_last_error() ? 1 : 0;
 649         }
 650
 651         function affectedRows() {
 652                 if( !isset( $this->mLastResult ) or ! $this->mLastResult )
 653                         return 0;
 654
 655                 return pg_affected_rows( $this->mLastResult );
 656         }
 657
 658         /**
 659          * Estimate rows in dataset
 660          * Returns estimated count, based on EXPLAIN output
 661          * This is not necessarily an accurate estimate, so use sparingly
 662          * Returns -1 if count cannot be found
 663          * Takes same arguments as Database::select()
 664          */
 665
 666         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
 667                 $options['EXPLAIN'] = true;
 668                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 669                 $rows = -1;
 670                 if ( $res ) {
 671                         $row = $this->fetchRow( $res );
 672                         $count = array();
 673                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 674                                 $rows = $count[1];
 675                         }
 676                         $this->freeResult($res);
 677                 }
 678                 return $rows;
 679         }
 680
 681
 682         /**
 683          * Returns information about an index
 684          * If errors are explicitly ignored, returns NULL on failure
 685          */
 686         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 687                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 688                 $res = $this->query( $sql, $fname );
 689                 if ( !$res ) {
 690                         return NULL;
 691                 }
 692                 while ( $row = $this->fetchObject( $res ) ) {
 693                         if ( $row->indexname == $index ) {
 694                                 return $row;
 695                         }
 696                 }
 697                 return false;
 698         }
 699
 700         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 701                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 702                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 703                 $res = $this->query( $sql, $fname );
 704                 if ( !$res )
 705                         return NULL;
 706                 while ($row = $this->fetchObject( $res ))
 707                         return true;
 708                 return false;
 709
 710         }
 711
 712         /**
 713          * INSERT wrapper, inserts an array into a table
 714          *
 715          * $args may be a single associative array, or an array of these with numeric keys,
 716          * for multi-row insert (Postgres version 8.2 and above only).
 717          *
 718          * @param array $table   String: Name of the table to insert to.
 719          * @param array $args    Array: Items to insert into the table.
 720          * @param array $fname   String: Name of the function, for profiling
 721          * @param mixed $options String or Array. Valid options: IGNORE
 722          *
 723          * @return bool Success of insert operation. IGNORE always returns true.
 724          */
 725         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 726                 global $wgDBversion;
 727
 728                 if ( !count( $args ) ) {
 729                         return true;
 730                 }
 731
 732                 $table = $this->tableName( $table );
 733                 if (! isset( $wgDBversion ) ) {
 734                         $this->getServerVersion();
 735                         $wgDBversion = $this->numeric_version;
 736                 }
 737
 738                 if ( !is_array( $options ) )
 739                         $options = array( $options );
 740
 741                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 742                         $multi = true;
 743                         $keys = array_keys( $args[0] );
 744                 }
 745                 else {
 746                         $multi = false;
 747                         $keys = array_keys( $args );
 748                 }
 749
 750                 $ignore = in_array( 'IGNORE', $options ) ? 1 : 0;
 751                 if ( $ignore )
 752                         $olde = error_reporting( 0 );
 753
 754                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 755
 756                 if ( $multi ) {
 757                         if ( $wgDBversion >= 8.2 ) {
 758                                 $first = true;
 759                                 foreach ( $args as $row ) {
 760                                         if ( $first ) {
 761                                                 $first = false;
 762                                         } else {
 763                                                 $sql .= ',';
 764                                         }
 765                                         $sql .= '(' . $this->makeList( $row ) . ')';
 766                                 }
 767                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 768                         }
 769                         else {
 770                                 $res = true;
 771                                 $origsql = $sql;
 772                                 foreach ( $args as $row ) {
 773                                         $tempsql = $origsql;
 774                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 775                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 776                                         if (! $tempres)
 777                                                 $res = false;
 778                                 }
 779                         }
 780                 }
 781                 else {
 782                         $sql .= '(' . $this->makeList( $args ) . ')';
 783                         $res = (bool)$this->query( $sql, $fname, $ignore );
 784                 }
 785
 786                 if ( $ignore ) {
 787                         $olde = error_reporting( $olde );
 788                         return true;
 789                 }
 790
 791                 return $res;
 792
 793         }
 794
 795         function tableName( $name ) {
 796                 # Replace reserved words with better ones
 797                 switch( $name ) {
 798                         case 'user':
 799                                 return 'mwuser';
 800                         case 'text':
 801                                 return 'pagecontent';
 802                         default:
 803                                 return $name;
 804                 }
 805         }
 806
 807         /**
 808          * Return the next in a sequence, save the value for retrieval via insertId()
 809          */
 810         function nextSequenceValue( $seqName ) {
 811                 $safeseq = preg_replace( "/'/", "''", $seqName );
 812                 $res = $this->query( "SELECT nextval('$safeseq')" );
 813                 $row = $this->fetchRow( $res );
 814                 $this->mInsertId = $row[0];
 815                 $this->freeResult( $res );
 816                 return $this->mInsertId;
 817         }
 818
 819         /**
 820          * Return the current value of a sequence. Assumes it has ben nextval'ed in this session.
 821          */
 822         function currentSequenceValue( $seqName ) {
 823                 $safeseq = preg_replace( "/'/", "''", $seqName );
 824                 $res = $this->query( "SELECT currval('$safeseq')" );
 825                 $row = $this->fetchRow( $res );
 826                 $currval = $row[0];
 827                 $this->freeResult( $res );
 828                 return $currval;
 829         }
 830
 831         /**
 832          * Postgres does not have a "USE INDEX" clause, so return an empty string
 833          */
 834         function useIndexClause( $index ) {
 835                 return '';
 836         }
 837
 838         # REPLACE query wrapper
 839         # Postgres simulates this with a DELETE followed by INSERT
 840         # $row is the row to insert, an associative array
 841         # $uniqueIndexes is an array of indexes. Each element may be either a
 842         # field name or an array of field names
 843         #
 844         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 845         # However if you do this, you run the risk of encountering errors which wouldn't have
 846         # occurred in MySQL
 847         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 848                 $table = $this->tableName( $table );
 849
 850                 if (count($rows)==0) {
 851                         return;
 852                 }
 853
 854                 # Single row case
 855                 if ( !is_array( reset( $rows ) ) ) {
 856                         $rows = array( $rows );
 857                 }
 858
 859                 foreach( $rows as $row ) {
 860                         # Delete rows which collide
 861                         if ( $uniqueIndexes ) {
 862                                 $sql = "DELETE FROM $table WHERE ";
 863                                 $first = true;
 864                                 foreach ( $uniqueIndexes as $index ) {
 865                                         if ( $first ) {
 866                                                 $first = false;
 867                                                 $sql .= "(";
 868                                         } else {
 869                                                 $sql .= ') OR (';
 870                                         }
 871                                         if ( is_array( $index ) ) {
 872                                                 $first2 = true;
 873                                                 foreach ( $index as $col ) {
 874                                                         if ( $first2 ) {
 875                                                                 $first2 = false;
 876                                                         } else {
 877                                                                 $sql .= ' AND ';
 878                                                         }
 879                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 880                                                 }
 881                                         } else {
 882                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 883                                         }
 884                                 }
 885                                 $sql .= ')';
 886                                 $this->query( $sql, $fname );
 887                         }
 888
 889                         # Now insert the row
 890                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 891                                 $this->makeList( $row, LIST_COMMA ) . ')';
 892                         $this->query( $sql, $fname );
 893                 }
 894         }
 895
 896         # DELETE where the condition is a join
 897         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 898                 if ( !$conds ) {
 899                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 900                 }
 901
 902                 $delTable = $this->tableName( $delTable );
 903                 $joinTable = $this->tableName( $joinTable );
 904                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 905                 if ( $conds != '*' ) {
 906                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 907                 }
 908                 $sql .= ')';
 909
 910                 $this->query( $sql, $fname );
 911         }
 912
 913         # Returns the size of a text field, or -1 for "unlimited"
 914         function textFieldSize( $table, $field ) {
 915                 $table = $this->tableName( $table );
 916                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 917                         FROM pg_class c, pg_attribute a, pg_type t
 918                         WHERE relname='$table' AND a.attrelid=c.oid AND
 919                                 a.atttypid=t.oid and a.attname='$field'";
 920                 $res =$this->query($sql);
 921                 $row=$this->fetchObject($res);
 922                 if ($row->ftype=="varchar") {
 923                         $size=$row->size-4;
 924                 } else {
 925                         $size=$row->size;
 926                 }
 927                 $this->freeResult( $res );
 928                 return $size;
 929         }
 930
 931         function lowPriorityOption() {
 932                 return '';
 933         }
 934
 935         function limitResult($sql, $limit, $offset=false) {
 936                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 937         }
 938
 939         /**
 940          * Returns an SQL expression for a simple conditional.
 941          * Uses CASE on Postgres
 942          *
 943          * @param string $cond SQL expression which will result in a boolean value
 944          * @param string $trueVal SQL expression to return if true
 945          * @param string $falseVal SQL expression to return if false
 946          * @return string SQL fragment
 947          */
 948         function conditional( $cond, $trueVal, $falseVal ) {
 949                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
 950         }
 951
 952         function wasDeadlock() {
 953                 return $this->lastErrno() == '40P01';
 954         }
 955
 956         function timestamp( $ts=0 ) {
 957                 return wfTimestamp(TS_POSTGRES,$ts);
 958         }
 959
 960         /**
 961          * Return aggregated value function call
 962          */
 963         function aggregateValue ($valuedata,$valuename='value') {
 964                 return $valuedata;
 965         }
 966
 967
 968         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 969                 // Ignore errors during error handling to avoid infinite recursion
 970                 $ignore = $this->ignoreErrors( true );
 971                 $this->mErrorCount++;
 972
 973                 if ($ignore || $tempIgnore) {
 974                         wfDebug("SQL ERROR (ignored): $error\n");
 975                         $this->ignoreErrors( $ignore );
 976                 }
 977                 else {
 978                         $message = "A database error has occurred\n" .
 979                                 "Query: $sql\n" .
 980                                 "Function: $fname\n" .
 981                                 "Error: $errno $error\n";
 982                         throw new DBUnexpectedError($this, $message);
 983                 }
 984         }
 985
 986         /**
 987          * @return string wikitext of a link to the server software's web site
 988          */
 989                 function getSoftwareLink() {
 990                 return "[http://www.postgresql.org/ PostgreSQL]";
 991         }
 992
 993         /**
 994          * @return string Version information from the database
 995          */
 996         function getServerVersion() {
 997                 $version = pg_fetch_result($this->doQuery("SELECT version()"),0,0);
 998                 $thisver = array();
 999                 if (!preg_match('/PostgreSQL (\d+\.\d+)(\S+)/', $version, $thisver)) {
1000                         die("Could not determine the numeric version from $version!");
1001                 }
1002                 $this->numeric_version = $thisver[1];
1003                 return $version;
1004         }
1005
1006
1007         /**
1008          * Query whether a given relation exists (in the given schema, or the
1009          * default mw one if not given)
1010          */
1011         function relationExists( $table, $types, $schema = false ) {
1012                 global $wgDBmwschema;
1013                 if (!is_array($types))
1014                         $types = array($types);
1015                 if (! $schema )
1016                         $schema = $wgDBmwschema;
1017                 $etable = $this->addQuotes($table);
1018                 $eschema = $this->addQuotes($schema);
1019                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1020                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1021                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1022                 $res = $this->query( $SQL );
1023                 $count = $res ? $res->numRows() : 0;
1024                 if ($res)
1025                         $this->freeResult( $res );
1026                 return $count ? true : false;
1027         }
1028
1029         /*
1030          * For backward compatibility, this function checks both tables and
1031          * views.
1032          */
1033         function tableExists ($table, $schema = false) {
1034                 return $this->relationExists($table, array('r', 'v'), $schema);
1035         }
1036
1037         function sequenceExists ($sequence, $schema = false) {
1038                 return $this->relationExists($sequence, 'S', $schema);
1039         }
1040
1041         function triggerExists($table, $trigger) {
1042                 global $wgDBmwschema;
1043
1044                 $q = <<<END
1045         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1046                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1047                       AND tgrelid=pg_class.oid
1048                       AND nspname=%s AND relname=%s AND tgname=%s
1049 END;
1050                 $res = $this->query(sprintf($q,
1051                                 $this->addQuotes($wgDBmwschema),
1052                                 $this->addQuotes($table),
1053                                 $this->addQuotes($trigger)));
1054                 if (!$res)
1055                         return NULL;
1056                 $rows = $res->numRows();
1057                 $this->freeResult($res);
1058                 return $rows;
1059         }
1060
1061         function ruleExists($table, $rule) {
1062                 global $wgDBmwschema;
1063                 $exists = $this->selectField("pg_rules", "rulename",
1064                                 array(  "rulename" => $rule,
1065                                         "tablename" => $table,
1066                                         "schemaname" => $wgDBmwschema));
1067                 return $exists === $rule;
1068         }
1069
1070         function constraintExists($table, $constraint) {
1071                 global $wgDBmwschema;
1072                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1073                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1074                         $this->addQuotes($wgDBmwschema),
1075                         $this->addQuotes($table),
1076                         $this->addQuotes($constraint));
1077                 $res = $this->query($SQL);
1078                 if (!$res)
1079                         return NULL;
1080                 $rows = $res->numRows();
1081                 $this->freeResult($res);
1082                 return $rows;
1083         }
1084
1085         /**
1086          * Query whether a given schema exists. Returns the name of the owner
1087          */
1088         function schemaExists( $schema ) {
1089                 $eschema = preg_replace("/'/", "''", $schema);
1090                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1091                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1092                 $res = $this->query( $SQL );
1093                 if ( $res && $res->numRows() ) {
1094                         $row = $res->fetchObject();
1095                         $owner = $row->rolname;
1096                 } else {
1097                         $owner = false;
1098                 }
1099                 if ($res)
1100                         $this->freeResult($res);
1101                 return $owner;
1102         }
1103
1104         /**
1105          * Query whether a given column exists in the mediawiki schema
1106          */
1107         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1108                 global $wgDBmwschema;
1109                 $etable = preg_replace("/'/", "''", $table);
1110                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1111                 $ecol = preg_replace("/'/", "''", $field);
1112                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1113                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1114                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1115                 $res = $this->query( $SQL, $fname );
1116                 $count = $res ? $res->numRows() : 0;
1117                 if ($res)
1118                         $this->freeResult( $res );
1119                 return $count;
1120         }
1121
1122         function fieldInfo( $table, $field ) {
1123                 return PostgresField::fromText($this, $table, $field);
1124         }
1125
1126         function begin( $fname = 'DatabasePostgres::begin' ) {
1127                 $this->query( 'BEGIN', $fname );
1128                 $this->mTrxLevel = 1;
1129         }
1130         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1131                 return true;
1132         }
1133         function commit( $fname = 'DatabasePostgres::commit' ) {
1134                 $this->query( 'COMMIT', $fname );
1135                 $this->mTrxLevel = 0;
1136         }
1137
1138         /* Not even sure why this is used in the main codebase... */
1139         function limitResultForUpdate($sql, $num) {
1140                 return $sql;
1141         }
1142
1143         function setup_database() {
1144                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1145
1146                 // Make sure that we can write to the correct schema
1147                 // If not, Postgres will happily and silently go to the next search_path item
1148                 $ctest = "mediawiki_test_table";
1149                 $safeschema = $this->quote_ident($wgDBmwschema);
1150                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1151                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1152                 }
1153                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1154                 $olde = error_reporting( 0 );
1155                 $res = $this->doQuery($SQL);
1156                 error_reporting( $olde );
1157                 if (!$res) {
1158                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"</li>\n";
1159                         dieout("</ul>");
1160                 }
1161                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1162
1163                 $res = dbsource( "../maintenance/postgres/tables.sql", $this);
1164
1165                 ## Update version information
1166                 $mwv = $this->addQuotes($wgVersion);
1167                 $pgv = $this->addQuotes($this->getServerVersion());
1168                 $pgu = $this->addQuotes($this->mUser);
1169                 $mws = $this->addQuotes($wgDBmwschema);
1170                 $tss = $this->addQuotes($wgDBts2schema);
1171                 $pgp = $this->addQuotes($wgDBport);
1172                 $dbn = $this->addQuotes($this->mDBname);
1173                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
1174
1175                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
1176                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
1177                                 "ctype = '$ctype' ".
1178                                 "WHERE type = 'Creation'";
1179                 $this->query($SQL);
1180
1181                 ## Avoid the non-standard "REPLACE INTO" syntax
1182                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1183                 if ($f == false ) {
1184                         dieout( "<li>Could not find the interwiki.sql file");
1185                 }
1186                 ## We simply assume it is already empty as we have just created it
1187                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1188                 while ( ! feof( $f ) ) {
1189                         $line = fgets($f,1024);
1190                         $matches = array();
1191                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1192                                 continue;
1193                         }
1194                         $this->query("$SQL $matches[1],$matches[2])");
1195                 }
1196                 print " (table interwiki successfully populated)...\n";
1197
1198                 $this->doQuery("COMMIT");
1199         }
1200
1201         function encodeBlob( $b ) {
1202                 return new Blob ( pg_escape_bytea( $b ) ) ;
1203         }
1204
1205         function decodeBlob( $b ) {
1206                 if ($b instanceof Blob) {
1207                         $b = $b->fetch();
1208                 }
1209                 return pg_unescape_bytea( $b );
1210         }
1211
1212         function strencode( $s ) { ## Should not be called by us
1213                 return pg_escape_string( $s );
1214         }
1215
1216         function addQuotes( $s ) {
1217                 if ( is_null( $s ) ) {
1218                         return 'NULL';
1219                 } else if ($s instanceof Blob) {
1220                         return "'".$s->fetch($s)."'";
1221                 }
1222                 return "'" . pg_escape_string($s) . "'";
1223         }
1224
1225         function quote_ident( $s ) {
1226                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1227         }
1228
1229         /* For now, does nothing */
1230         function selectDB( $db ) {
1231                 return true;
1232         }
1233
1234         /**
1235          * Postgres specific version of replaceVars.
1236          * Calls the parent version in Database.php
1237          *
1238          * @private
1239          *
1240          * @param string $com SQL string, read from a stream (usually tables.sql)
1241          *
1242          * @return string SQL string
1243          */
1244         protected function replaceVars( $ins ) {
1245
1246                 $ins = parent::replaceVars( $ins );
1247
1248                 if ($this->numeric_version >= 8.3) {
1249                         // Thanks for not providing backwards-compatibility, 8.3
1250                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1251                 }
1252
1253                 if ($this->numeric_version <= 8.1) { // Our minimum version
1254                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1255                 }
1256
1257                 return $ins;
1258         }
1259
1260         /**
1261          * Various select options
1262          *
1263          * @private
1264          *
1265          * @param array $options an associative array of options to be turned into
1266          *              an SQL query, valid keys are listed in the function.
1267          * @return array
1268          */
1269         function makeSelectOptions( $options ) {
1270                 $preLimitTail = $postLimitTail = '';
1271                 $startOpts = $useIndex = '';
1272
1273                 $noKeyOptions = array();
1274                 foreach ( $options as $key => $option ) {
1275                         if ( is_numeric( $key ) ) {
1276                                 $noKeyOptions[$option] = true;
1277                         }
1278                 }
1279
1280                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1281                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1282                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1283
1284                 //if (isset($options['LIMIT'])) {
1285                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1286                 //              isset($options['OFFSET']) ? $options['OFFSET']
1287                 //              : false);
1288                 //}
1289
1290                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1291                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1292                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1293
1294                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1295         }
1296
1297         public function setTimeout( $timeout ) {
1298                 // @todo fixme no-op
1299         }
1300
1301         function ping() {
1302                 wfDebug( "Function ping() not written for DatabasePostgres.php yet");
1303                 return true;
1304         }
1305
1306         /**
1307          * How lagged is this slave?
1308          *
1309          */
1310         public function getLag() {
1311                 # Not implemented for PostgreSQL
1312                 return false;
1313         }
1314
1315         function setFakeSlaveLag() {}
1316         function setFakeMaster() {}
1317
1318         function getDBname() {
1319                 return $this->mDBname;
1320         }
1321
1322         function getServer() {
1323                 return $this->mServer;
1324         }
1325
1326         function buildConcat( $stringList ) {
1327                 return implode( ' || ', $stringList );
1328         }
1329
1330 } // end DatabasePostgres class