includes/db/DatabasePostgres.php

   1 <?php
   2 /**
   3  * @ingroup Database
   4  * @file
   5  * This is the Postgres database abstraction layer.
   6  *
   7  */
   8 class PostgresField {
   9         private $name, $tablename, $type, $nullable, $max_length;
  10
  11         static function fromText($db, $table, $field) {
  12         global $wgDBmwschema;
  13
  14                 $q = <<<END
  15 SELECT
  16 CASE WHEN typname = 'int2' THEN 'smallint'
  17 WHEN typname = 'int4' THEN 'integer'
  18 WHEN typname = 'int8' THEN 'bigint'
  19 WHEN typname = 'bpchar' THEN 'char'
  20 ELSE typname END AS typname,
  21 attnotnull, attlen
  22 FROM pg_class, pg_namespace, pg_attribute, pg_type
  23 WHERE relnamespace=pg_namespace.oid
  24 AND relkind='r'
  25 AND attrelid=pg_class.oid
  26 AND atttypid=pg_type.oid
  27 AND nspname=%s
  28 AND relname=%s
  29 AND attname=%s;
  30 END;
  31                 $res = $db->query(sprintf($q,
  32                                 $db->addQuotes($wgDBmwschema),
  33                                 $db->addQuotes($table),
  34                                 $db->addQuotes($field)));
  35                 $row = $db->fetchObject($res);
  36                 if (!$row)
  37                         return null;
  38                 $n = new PostgresField;
  39                 $n->type = $row->typname;
  40                 $n->nullable = ($row->attnotnull == 'f');
  41                 $n->name = $field;
  42                 $n->tablename = $table;
  43                 $n->max_length = $row->attlen;
  44                 return $n;
  45         }
  46
  47         function name() {
  48                 return $this->name;
  49         }
  50
  51         function tableName() {
  52                 return $this->tablename;
  53         }
  54
  55         function type() {
  56                 return $this->type;
  57         }
  58
  59         function nullable() {
  60                 return $this->nullable;
  61         }
  62
  63         function maxLength() {
  64                 return $this->max_length;
  65         }
  66 }
  67
  68 /**
  69  * @ingroup Database
  70  */
  71 class DatabasePostgres extends Database {
  72         var $mInsertId = NULL;
  73         var $mLastResult = NULL;
  74         var $numeric_version = NULL;
  75
  76         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  77                 $failFunction = false, $flags = 0 )
  78         {
  79
  80                 global $wgOut;
  81                 # Can't get a reference if it hasn't been set yet
  82                 if ( !isset( $wgOut ) ) {
  83                         $wgOut = NULL;
  84                 }
  85                 $this->mOut =& $wgOut;
  86                 $this->mFailFunction = $failFunction;
  87                 $this->mFlags = $flags;
  88                 $this->open( $server, $user, $password, $dbName);
  89
  90         }
  91
  92         function cascadingDeletes() {
  93                 return true;
  94         }
  95         function cleanupTriggers() {
  96                 return true;
  97         }
  98         function strictIPs() {
  99                 return true;
 100         }
 101         function realTimestamps() {
 102                 return true;
 103         }
 104         function implicitGroupby() {
 105                 return false;
 106         }
 107         function implicitOrderby() {
 108                 return false;
 109         }
 110         function searchableIPs() {
 111                 return true;
 112         }
 113         function functionalIndexes() {
 114                 return true;
 115         }
 116
 117         function hasConstraint( $name ) {
 118                 global $wgDBmwschema;
 119                 $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) ."'";
 120                 return $this->numRows($res = $this->doQuery($SQL));
 121         }
 122
 123         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 124         {
 125                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 126         }
 127
 128         /**
 129          * Usually aborts on failure
 130          * If the failFunction is set to a non-zero integer, returns success
 131          */
 132         function open( $server, $user, $password, $dbName ) {
 133                 # Test for Postgres support, to avoid suppressed fatal error
 134                 if ( !function_exists( 'pg_connect' ) ) {
 135                         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" );
 136                 }
 137
 138                 global $wgDBport;
 139
 140                 if (!strlen($user)) { ## e.g. the class is being loaded
 141                         return;
 142                 }
 143
 144                 $this->close();
 145                 $this->mServer = $server;
 146                 $this->mPort = $port = $wgDBport;
 147                 $this->mUser = $user;
 148                 $this->mPassword = $password;
 149                 $this->mDBname = $dbName;
 150
 151                 $hstring="";
 152                 if ($server!=false && $server!="") {
 153                         $hstring="host=$server ";
 154                 }
 155                 if ($port!=false && $port!="") {
 156                         $hstring .= "port=$port ";
 157                 }
 158
 159                 error_reporting( E_ALL );
 160                 @$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
 161
 162                 if ( $this->mConn == false ) {
 163                         wfDebug( "DB connection error\n" );
 164                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 165                         wfDebug( $this->lastError()."\n" );
 166                         return false;
 167                 }
 168
 169                 $this->mOpened = true;
 170
 171                 global $wgCommandLineMode;
 172                 ## If called from the command-line (e.g. importDump), only show errors
 173                 if ($wgCommandLineMode) {
 174                         $this->doQuery("SET client_min_messages = 'ERROR'");
 175                 }
 176
 177                 global $wgDBmwschema, $wgDBts2schema;
 178                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 179                         && $wgDBmwschema !== 'mediawiki'
 180                         && preg_match( '/^\w+$/', $wgDBmwschema )
 181                         && preg_match( '/^\w+$/', $wgDBts2schema )
 182                 ) {
 183                         $safeschema = $this->quote_ident($wgDBmwschema);
 184                         $safeschema2 = $this->quote_ident($wgDBts2schema);
 185                         $this->doQuery("SET search_path = $safeschema, $wgDBts2schema, public");
 186                 }
 187
 188                 return $this->mConn;
 189         }
 190
 191
 192         function initial_setup($password, $dbName) {
 193                 // If this is the initial connection, setup the schema stuff and possibly create the user
 194                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
 195
 196                 print "<li>Checking the version of Postgres...";
 197                 $version = $this->getServerVersion();
 198                 $PGMINVER = '8.1';
 199                 if ($this->numeric_version < $PGMINVER) {
 200                         print "<b>FAILED</b>. Required version is $PGMINVER. You have $this->numeric_version ($version)</li>\n";
 201                         dieout("</ul>");
 202                 }
 203                 print "version $this->numeric_version is OK.</li>\n";
 204
 205                 $safeuser = $this->quote_ident($wgDBuser);
 206                 // Are we connecting as a superuser for the first time?
 207                 if ($wgDBsuperuser) {
 208                         // Are we really a superuser? Check out our rights
 209                         $SQL = "SELECT
 210                       CASE WHEN usesuper IS TRUE THEN
 211                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 212                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 213                     END AS rights
 214                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 215                         $rows = $this->numRows($res = $this->doQuery($SQL));
 216                         if (!$rows) {
 217                                 print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 218                                 dieout('</ul>');
 219                         }
 220                         $perms = pg_fetch_result($res, 0, 0);
 221
 222                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 223                         $rows = $this->numRows($this->doQuery($SQL));
 224                         if ($rows) {
 225                                 print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 226                         }
 227                         else {
 228                                 if ($perms != 1 and $perms != 3) {
 229                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 230                                         print 'Please use a different Postgres user.</li>';
 231                                         dieout('</ul>');
 232                                 }
 233                                 print "<li>Creating user <b>$wgDBuser</b>...";
 234                                 $safepass = $this->addQuotes($wgDBpassword);
 235                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 236                                 $this->doQuery($SQL);
 237                                 print "OK</li>\n";
 238                         }
 239                         // User now exists, check out the database
 240                         if ($dbName != $wgDBname) {
 241                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 242                                 $rows = $this->numRows($this->doQuery($SQL));
 243                                 if ($rows) {
 244                                         print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 245                                 }
 246                                 else {
 247                                         if ($perms < 2) {
 248                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 249                                                 print 'Please use a different Postgres user.</li>';
 250                                                 dieout('</ul>');
 251                                         }
 252                                         print "<li>Creating database <b>$wgDBname</b>...";
 253                                         $safename = $this->quote_ident($wgDBname);
 254                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 255                                         $this->doQuery($SQL);
 256                                         print "OK</li>\n";
 257                                         // Hopefully tsearch2 and plpgsql are in template1...
 258                                 }
 259
 260                                 // Reconnect to check out tsearch2 rights for this user
 261                                 print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 262
 263                                 $hstring="";
 264                                 if ($this->mServer!=false && $this->mServer!="") {
 265                                         $hstring="host=$this->mServer ";
 266                                 }
 267                                 if ($this->mPort!=false && $this->mPort!="") {
 268                                         $hstring .= "port=$this->mPort ";
 269                                 }
 270
 271                                 @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$wgDBsuperuser password=$password");
 272                                 if ( $this->mConn == false ) {
 273                                         print "<b>FAILED TO CONNECT!</b></li>";
 274                                         dieout("</ul>");
 275                                 }
 276                                 print "OK</li>\n";
 277                         }
 278
 279                         if ($this->numeric_version < 8.3) {
 280                                 // Tsearch2 checks
 281                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 282                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 283                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 284                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 285                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 286                                         dieout("</ul>");
 287                                 }
 288                                 print "OK</li>\n";
 289                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 290                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 291                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 292                                         $this->doQuery($SQL);
 293                                 }
 294                                 print "OK</li>\n";
 295                         }
 296
 297                         // Setup the schema for this user if needed
 298                         $result = $this->schemaExists($wgDBmwschema);
 299                         $safeschema = $this->quote_ident($wgDBmwschema);
 300                         if (!$result) {
 301                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 302                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 303                                 if (!$result) {
 304                                         print "<b>FAILED</b>.</li>\n";
 305                                         dieout("</ul>");
 306                                 }
 307                                 print "OK</li>\n";
 308                         }
 309                         else {
 310                                 print "<li>Schema already exists, explicitly granting rights...\n";
 311                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 312                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 313                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 314                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 315                                         "AND p.relkind IN ('r','S','v')\n";
 316                                 $SQL .= "UNION\n";
 317                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 318                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 319                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 320                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 321                                 $res = $this->doQuery($SQL);
 322                                 if (!$res) {
 323                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 324                                         dieout("</ul>");
 325                                 }
 326                                 $this->doQuery("SET search_path = $safeschema");
 327                                 $rows = $this->numRows($res);
 328                                 while ($rows) {
 329                                         $rows--;
 330                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 331                                 }
 332                                 print "OK</li>";
 333                         }
 334
 335                         // Install plpgsql if needed
 336                         $this->setup_plpgsql();
 337
 338                         $wgDBsuperuser = '';
 339                         return true; // Reconnect as regular user
 340
 341                 } // end superuser
 342
 343                 if (!defined('POSTGRES_SEARCHPATH')) {
 344
 345                         if ($this->numeric_version < 8.3) {
 346                                 // Do we have the basic tsearch2 table?
 347                                 print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 348                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 349                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 350                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 351                                         print " for instructions.</li>\n";
 352                                         dieout("</ul>");
 353                                 }
 354                                 print "OK</li>\n";
 355
 356                                 // Does this user have the rights to the tsearch2 tables?
 357                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 358                                 print "<li>Checking tsearch2 permissions...";
 359                                 // Let's check all four, just to be safe
 360                                 error_reporting( 0 );
 361                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 362                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 363                                 foreach ( $ts2tables AS $tname ) {
 364                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 365                                         $res = $this->doQuery($SQL);
 366                                         if (!$res) {
 367                                                 print "<b>FAILED</b> to access pg_ts_$tname. Make sure that the user ".
 368                                                         "\"$wgDBuser\" has SELECT access to all four tsearch2 tables</li>\n";
 369                                                 dieout("</ul>");
 370                                         }
 371                                 }
 372                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = '$ctype'";
 373                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 374                                 $res = $this->doQuery($SQL);
 375                                 error_reporting( E_ALL );
 376                                 if (!$res) {
 377                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 378                                         dieout("</ul>");
 379                                 }
 380                                 print "OK</li>";
 381
 382                                 // Will the current locale work? Can we force it to?
 383                                 print "<li>Verifying tsearch2 locale with $ctype...";
 384                                 $rows = $this->numRows($res);
 385                                 $resetlocale = 0;
 386                                 if (!$rows) {
 387                                         print "<b>not found</b></li>\n";
 388                                         print "<li>Attempting to set default tsearch2 locale to \"$ctype\"...";
 389                                         $resetlocale = 1;
 390                                 }
 391                                 else {
 392                                         $tsname = pg_fetch_result($res, 0, 0);
 393                                         if ($tsname != 'default') {
 394                                                 print "<b>not set to default ($tsname)</b>";
 395                                                 print "<li>Attempting to change tsearch2 default locale to \"$ctype\"...";
 396                                                 $resetlocale = 1;
 397                                         }
 398                                 }
 399                                 if ($resetlocale) {
 400                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
 401                                         $res = $this->doQuery($SQL);
 402                                         if (!$res) {
 403                                                 print "<b>FAILED</b>. ";
 404                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"</li>\n";
 405                                                 dieout("</ul>");
 406                                         }
 407                                         print "OK</li>";
 408                                 }
 409
 410                                 // Final test: try out a simple tsearch2 query
 411                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 412                                 $res = $this->doQuery($SQL);
 413                                 if (!$res) {
 414                                         print "<b>FAILED</b>. Specifically, \"$SQL\" did not work.</li>";
 415                                         dieout("</ul>");
 416                                 }
 417                                 print "OK</li>";
 418                         }
 419
 420                         // Install plpgsql if needed
 421                         $this->setup_plpgsql();
 422
 423                         // Does the schema already exist? Who owns it?
 424                         $result = $this->schemaExists($wgDBmwschema);
 425                         if (!$result) {
 426                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 427                                 error_reporting( 0 );
 428                                 $safeschema = $this->quote_ident($wgDBmwschema);
 429                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 430                                 error_reporting( E_ALL );
 431                                 if (!$result) {
 432                                         print "<b>FAILED</b>. The user \"$wgDBuser\" must be able to access the schema. ".
 433                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 434                                                 "different user, and then grant access to the \"$wgDBuser\" user.</li>\n";
 435                                         dieout("</ul>");
 436                                 }
 437                                 print "OK</li>\n";
 438                         }
 439                         else if ($result != $wgDBuser) {
 440                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$wgDBuser\". Not ideal.</li>\n";
 441                         }
 442                         else {
 443                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$wgDBuser\". Excellent.</li>\n";
 444                         }
 445
 446                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 447                         print "<li>Setting the timezone to GMT for user \"$wgDBuser\" ...";
 448                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 449                         $result = pg_query($this->mConn, $SQL);
 450                         if (!$result) {
 451                                 print "<b>FAILED</b>.</li>\n";
 452                                 dieout("</ul>");
 453                         }
 454                         print "OK</li>\n";
 455                         // Set for the rest of this session
 456                         $SQL = "SET timezone = 'GMT'";
 457                         $result = pg_query($this->mConn, $SQL);
 458                         if (!$result) {
 459                                 print "<li>Failed to set timezone</li>\n";
 460                                 dieout("</ul>");
 461                         }
 462
 463                         print "<li>Setting the datestyle to ISO, YMD for user \"$wgDBuser\" ...";
 464                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 465                         $result = pg_query($this->mConn, $SQL);
 466                         if (!$result) {
 467                                 print "<b>FAILED</b>.</li>\n";
 468                                 dieout("</ul>");
 469                         }
 470                         print "OK</li>\n";
 471                         // Set for the rest of this session
 472                         $SQL = "SET datestyle = 'ISO, YMD'";
 473                         $result = pg_query($this->mConn, $SQL);
 474                         if (!$result) {
 475                                 print "<li>Failed to set datestyle</li>\n";
 476                                 dieout("</ul>");
 477                         }
 478
 479                         // Fix up the search paths if needed
 480                         print "<li>Setting the search path for user \"$wgDBuser\" ...";
 481                         $path = $this->quote_ident($wgDBmwschema);
 482                         if ($wgDBts2schema !== $wgDBmwschema)
 483                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 484                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 485                                 $path .= ", public";
 486                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 487                         $result = pg_query($this->mConn, $SQL);
 488                         if (!$result) {
 489                                 print "<b>FAILED</b>.</li>\n";
 490                                 dieout("</ul>");
 491                         }
 492                         print "OK</li>\n";
 493                         // Set for the rest of this session
 494                         $SQL = "SET search_path = $path";
 495                         $result = pg_query($this->mConn, $SQL);
 496                         if (!$result) {
 497                                 print "<li>Failed to set search_path</li>\n";
 498                                 dieout("</ul>");
 499                         }
 500                         define( "POSTGRES_SEARCHPATH", $path );
 501                 }
 502         }
 503
 504
 505         function setup_plpgsql() {
 506                 print "<li>Checking for Pl/Pgsql ...";
 507                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 508                 $rows = $this->numRows($this->doQuery($SQL));
 509                 if ($rows < 1) {
 510                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 511                         print "not installed. Attempting to install Pl/Pgsql ...";
 512                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 513                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 514                         $rows = $this->numRows($this->doQuery($SQL));
 515                         if ($rows >= 1) {
 516                         $olde = error_reporting(0);
 517                                 error_reporting($olde - E_WARNING);
 518                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 519                                 error_reporting($olde);
 520                                 if (!$result) {
 521                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 522                                         dieout("</ul>");
 523                                 }
 524                         }
 525                         else {
 526                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 527                                 dieout("</ul>");
 528                         }
 529                 }
 530                 print "OK</li>\n";
 531         }
 532
 533
 534         /**
 535          * Closes a database connection, if it is open
 536          * Returns success, true if already closed
 537          */
 538         function close() {
 539                 $this->mOpened = false;
 540                 if ( $this->mConn ) {
 541                         return pg_close( $this->mConn );
 542                 } else {
 543                         return true;
 544                 }
 545         }
 546
 547         function doQuery( $sql ) {
 548                 if (function_exists('mb_convert_encoding')) {
 549                         return $this->mLastResult=pg_query( $this->mConn , mb_convert_encoding($sql,'UTF-8') );
 550                 }
 551                 return $this->mLastResult=pg_query( $this->mConn , $sql);
 552         }
 553
 554         function queryIgnore( $sql, $fname = '' ) {
 555                 return $this->query( $sql, $fname, true );
 556         }
 557
 558         function freeResult( $res ) {
 559                 if ( $res instanceof ResultWrapper ) {
 560                         $res = $res->result;
 561                 }
 562                 if ( !@pg_free_result( $res ) ) {
 563                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 564                 }
 565         }
 566
 567         function fetchObject( $res ) {
 568                 if ( $res instanceof ResultWrapper ) {
 569                         $res = $res->result;
 570                 }
 571                 @$row = pg_fetch_object( $res );
 572                 # FIXME: HACK HACK HACK HACK debug
 573
 574                 # TODO:
 575                 # hashar : not sure if the following test really trigger if the object
 576                 #          fetching failed.
 577                 if( pg_last_error($this->mConn) ) {
 578                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 579                 }
 580                 return $row;
 581         }
 582
 583         function fetchRow( $res ) {
 584                 if ( $res instanceof ResultWrapper ) {
 585                         $res = $res->result;
 586                 }
 587                 @$row = pg_fetch_array( $res );
 588                 if( pg_last_error($this->mConn) ) {
 589                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 590                 }
 591                 return $row;
 592         }
 593
 594         function numRows( $res ) {
 595                 if ( $res instanceof ResultWrapper ) {
 596                         $res = $res->result;
 597                 }
 598                 @$n = pg_num_rows( $res );
 599                 if( pg_last_error($this->mConn) ) {
 600                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 601                 }
 602                 return $n;
 603         }
 604         function numFields( $res ) {
 605                 if ( $res instanceof ResultWrapper ) {
 606                         $res = $res->result;
 607                 }
 608                 return pg_num_fields( $res );
 609         }
 610         function fieldName( $res, $n ) {
 611                 if ( $res instanceof ResultWrapper ) {
 612                         $res = $res->result;
 613                 }
 614                 return pg_field_name( $res, $n );
 615         }
 616
 617         /**
 618          * This must be called after nextSequenceVal
 619          */
 620         function insertId() {
 621                 return $this->mInsertId;
 622         }
 623
 624         function dataSeek( $res, $row ) {
 625                 if ( $res instanceof ResultWrapper ) {
 626                         $res = $res->result;
 627                 }
 628                 return pg_result_seek( $res, $row );
 629         }
 630
 631         function lastError() {
 632                 if ( $this->mConn ) {
 633                         return pg_last_error();
 634                 }
 635                 else {
 636                         return "No database connection";
 637                 }
 638         }
 639         function lastErrno() {
 640                 return pg_last_error() ? 1 : 0;
 641         }
 642
 643         function affectedRows() {
 644                 if( !isset( $this->mLastResult ) or ! $this->mLastResult )
 645                         return 0;
 646
 647                 return pg_affected_rows( $this->mLastResult );
 648         }
 649
 650         /**
 651          * Estimate rows in dataset
 652          * Returns estimated count, based on EXPLAIN output
 653          * This is not necessarily an accurate estimate, so use sparingly
 654          * Returns -1 if count cannot be found
 655          * Takes same arguments as Database::select()
 656          */
 657
 658         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
 659                 $options['EXPLAIN'] = true;
 660                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 661                 $rows = -1;
 662                 if ( $res ) {
 663                         $row = $this->fetchRow( $res );
 664                         $count = array();
 665                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 666                                 $rows = $count[1];
 667                         }
 668                         $this->freeResult($res);
 669                 }
 670                 return $rows;
 671         }
 672
 673
 674         /**
 675          * Returns information about an index
 676          * If errors are explicitly ignored, returns NULL on failure
 677          */
 678         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 679                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 680                 $res = $this->query( $sql, $fname );
 681                 if ( !$res ) {
 682                         return NULL;
 683                 }
 684                 while ( $row = $this->fetchObject( $res ) ) {
 685                         if ( $row->indexname == $index ) {
 686                                 return $row;
 687                         }
 688                 }
 689                 return false;
 690         }
 691
 692         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 693                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 694                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 695                 $res = $this->query( $sql, $fname );
 696                 if ( !$res )
 697                         return NULL;
 698                 while ($row = $this->fetchObject( $res ))
 699                         return true;
 700                 return false;
 701
 702         }
 703
 704         /**
 705          * INSERT wrapper, inserts an array into a table
 706          *
 707          * $args may be a single associative array, or an array of these with numeric keys,
 708          * for multi-row insert (Postgres version 8.2 and above only).
 709          *
 710          * @param array $table   String: Name of the table to insert to.
 711          * @param array $args    Array: Items to insert into the table.
 712          * @param array $fname   String: Name of the function, for profiling
 713          * @param mixed $options String or Array. Valid options: IGNORE
 714          *
 715          * @return bool Success of insert operation. IGNORE always returns true.
 716          */
 717         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 718                 global $wgDBversion;
 719
 720                 if ( !count( $args ) ) {
 721                         return true;
 722                 }
 723
 724                 $table = $this->tableName( $table );
 725                 if (! isset( $wgDBversion ) ) {
 726                         $this->getServerVersion();
 727                         $wgDBversion = $this->numeric_version;
 728                 }
 729
 730                 if ( !is_array( $options ) )
 731                         $options = array( $options );
 732
 733                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 734                         $multi = true;
 735                         $keys = array_keys( $args[0] );
 736                 }
 737                 else {
 738                         $multi = false;
 739                         $keys = array_keys( $args );
 740                 }
 741
 742                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 743                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 744
 745                 // If we are not in a transaction, we need to be for savepoint trickery
 746                 $didbegin = 0;
 747                 if ( $ignore ) {
 748                         if (! $this->mTrxLevel) {
 749                                 $this->begin();
 750                                 $didbegin = 1;
 751                         }
 752                         $olde = error_reporting( 0 );
 753                         // For future use, we may want to track the number of actual inserts
 754                         // Right now, insert (all writes) simply return true/false
 755                         $numrowsinserted = 0;
 756                 }
 757
 758                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 759
 760                 if ( $multi ) {
 761                         if ( $wgDBversion >= 8.2 && !$ignore ) {
 762                                 $first = true;
 763                                 foreach ( $args as $row ) {
 764                                         if ( $first ) {
 765                                                 $first = false;
 766                                         } else {
 767                                                 $sql .= ',';
 768                                         }
 769                                         $sql .= '(' . $this->makeList( $row ) . ')';
 770                                 }
 771                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 772                         }
 773                         else {
 774                                 $res = true;
 775                                 $origsql = $sql;
 776                                 foreach ( $args as $row ) {
 777                                         $tempsql = $origsql;
 778                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 779
 780                                         if ( $ignore ) {
 781                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 782                                         }
 783
 784                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 785
 786                                         if ( $ignore ) {
 787                                                 $bar = pg_last_error();
 788                                                 if ($bar != false) {
 789                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 790                                                 }
 791                                                 else {
 792                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 793                                                         $numrowsinserted++;
 794                                                 }
 795                                         }
 796
 797                                         // If any of them fail, we fail overall for this function call
 798                                         // Note that this will be ignored if IGNORE is set
 799                                         if (! $tempres)
 800                                                 $res = false;
 801                                 }
 802                         }
 803                 }
 804                 else {
 805                         // Not multi, just a lone insert
 806                         if ( $ignore ) {
 807                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 808                         }
 809
 810                         $sql .= '(' . $this->makeList( $args ) . ')';
 811                         $res = (bool)$this->query( $sql, $fname, $ignore );
 812
 813                         if ( $ignore ) {
 814                                 $bar = pg_last_error();
 815                                 if ($bar != false) {
 816                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 817                                 }
 818                                 else {
 819                                         pg_query( $this->mConn, "RELEASE $ignore" );
 820                                         $numrowsinserted++;
 821                                 }
 822                         }
 823                 }
 824
 825                 if ( $ignore ) {
 826                         $olde = error_reporting( $olde );
 827                         if ($didbegin) {
 828                                 $this->commit();
 829                         }
 830
 831                         // IGNORE always returns true
 832                         return true;
 833                 }
 834
 835
 836                 return $res;
 837
 838         }
 839
 840         function tableName( $name ) {
 841                 # Replace reserved words with better ones
 842                 switch( $name ) {
 843                         case 'user':
 844                                 return 'mwuser';
 845                         case 'text':
 846                                 return 'pagecontent';
 847                         default:
 848                                 return $name;
 849                 }
 850         }
 851
 852         /**
 853          * Return the next in a sequence, save the value for retrieval via insertId()
 854          */
 855         function nextSequenceValue( $seqName ) {
 856                 $safeseq = preg_replace( "/'/", "''", $seqName );
 857                 $res = $this->query( "SELECT nextval('$safeseq')" );
 858                 $row = $this->fetchRow( $res );
 859                 $this->mInsertId = $row[0];
 860                 $this->freeResult( $res );
 861                 return $this->mInsertId;
 862         }
 863
 864         /**
 865          * Return the current value of a sequence. Assumes it has ben nextval'ed in this session.
 866          */
 867         function currentSequenceValue( $seqName ) {
 868                 $safeseq = preg_replace( "/'/", "''", $seqName );
 869                 $res = $this->query( "SELECT currval('$safeseq')" );
 870                 $row = $this->fetchRow( $res );
 871                 $currval = $row[0];
 872                 $this->freeResult( $res );
 873                 return $currval;
 874         }
 875
 876         /**
 877          * Postgres does not have a "USE INDEX" clause, so return an empty string
 878          */
 879         function useIndexClause( $index ) {
 880                 return '';
 881         }
 882
 883         # REPLACE query wrapper
 884         # Postgres simulates this with a DELETE followed by INSERT
 885         # $row is the row to insert, an associative array
 886         # $uniqueIndexes is an array of indexes. Each element may be either a
 887         # field name or an array of field names
 888         #
 889         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 890         # However if you do this, you run the risk of encountering errors which wouldn't have
 891         # occurred in MySQL
 892         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 893                 $table = $this->tableName( $table );
 894
 895                 if (count($rows)==0) {
 896                         return;
 897                 }
 898
 899                 # Single row case
 900                 if ( !is_array( reset( $rows ) ) ) {
 901                         $rows = array( $rows );
 902                 }
 903
 904                 foreach( $rows as $row ) {
 905                         # Delete rows which collide
 906                         if ( $uniqueIndexes ) {
 907                                 $sql = "DELETE FROM $table WHERE ";
 908                                 $first = true;
 909                                 foreach ( $uniqueIndexes as $index ) {
 910                                         if ( $first ) {
 911                                                 $first = false;
 912                                                 $sql .= "(";
 913                                         } else {
 914                                                 $sql .= ') OR (';
 915                                         }
 916                                         if ( is_array( $index ) ) {
 917                                                 $first2 = true;
 918                                                 foreach ( $index as $col ) {
 919                                                         if ( $first2 ) {
 920                                                                 $first2 = false;
 921                                                         } else {
 922                                                                 $sql .= ' AND ';
 923                                                         }
 924                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 925                                                 }
 926                                         } else {
 927                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 928                                         }
 929                                 }
 930                                 $sql .= ')';
 931                                 $this->query( $sql, $fname );
 932                         }
 933
 934                         # Now insert the row
 935                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 936                                 $this->makeList( $row, LIST_COMMA ) . ')';
 937                         $this->query( $sql, $fname );
 938                 }
 939         }
 940
 941         # DELETE where the condition is a join
 942         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 943                 if ( !$conds ) {
 944                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 945                 }
 946
 947                 $delTable = $this->tableName( $delTable );
 948                 $joinTable = $this->tableName( $joinTable );
 949                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 950                 if ( $conds != '*' ) {
 951                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 952                 }
 953                 $sql .= ')';
 954
 955                 $this->query( $sql, $fname );
 956         }
 957
 958         # Returns the size of a text field, or -1 for "unlimited"
 959         function textFieldSize( $table, $field ) {
 960                 $table = $this->tableName( $table );
 961                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 962                         FROM pg_class c, pg_attribute a, pg_type t
 963                         WHERE relname='$table' AND a.attrelid=c.oid AND
 964                                 a.atttypid=t.oid and a.attname='$field'";
 965                 $res =$this->query($sql);
 966                 $row=$this->fetchObject($res);
 967                 if ($row->ftype=="varchar") {
 968                         $size=$row->size-4;
 969                 } else {
 970                         $size=$row->size;
 971                 }
 972                 $this->freeResult( $res );
 973                 return $size;
 974         }
 975
 976         function lowPriorityOption() {
 977                 return '';
 978         }
 979
 980         function limitResult($sql, $limit, $offset=false) {
 981                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 982         }
 983
 984         /**
 985          * Returns an SQL expression for a simple conditional.
 986          * Uses CASE on Postgres
 987          *
 988          * @param string $cond SQL expression which will result in a boolean value
 989          * @param string $trueVal SQL expression to return if true
 990          * @param string $falseVal SQL expression to return if false
 991          * @return string SQL fragment
 992          */
 993         function conditional( $cond, $trueVal, $falseVal ) {
 994                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
 995         }
 996
 997         function wasDeadlock() {
 998                 return $this->lastErrno() == '40P01';
 999         }
1000
1001         function timestamp( $ts=0 ) {
1002                 return wfTimestamp(TS_POSTGRES,$ts);
1003         }
1004
1005         /**
1006          * Return aggregated value function call
1007          */
1008         function aggregateValue ($valuedata,$valuename='value') {
1009                 return $valuedata;
1010         }
1011
1012
1013         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1014                 // Ignore errors during error handling to avoid infinite recursion
1015                 $ignore = $this->ignoreErrors( true );
1016                 $this->mErrorCount++;
1017
1018                 if ($ignore || $tempIgnore) {
1019                         wfDebug("SQL ERROR (ignored): $error\n");
1020                         $this->ignoreErrors( $ignore );
1021                 }
1022                 else {
1023                         $message = "A database error has occurred\n" .
1024                                 "Query: $sql\n" .
1025                                 "Function: $fname\n" .
1026                                 "Error: $errno $error\n";
1027                         throw new DBUnexpectedError($this, $message);
1028                 }
1029         }
1030
1031         /**
1032          * @return string wikitext of a link to the server software's web site
1033          */
1034                 function getSoftwareLink() {
1035                 return "[http://www.postgresql.org/ PostgreSQL]";
1036         }
1037
1038         /**
1039          * @return string Version information from the database
1040          */
1041         function getServerVersion() {
1042                 $version = pg_fetch_result($this->doQuery("SELECT version()"),0,0);
1043                 $thisver = array();
1044                 if (!preg_match('/PostgreSQL (\d+\.\d+)(\S+)/', $version, $thisver)) {
1045                         die("Could not determine the numeric version from $version!");
1046                 }
1047                 $this->numeric_version = $thisver[1];
1048                 return $version;
1049         }
1050
1051
1052         /**
1053          * Query whether a given relation exists (in the given schema, or the
1054          * default mw one if not given)
1055          */
1056         function relationExists( $table, $types, $schema = false ) {
1057                 global $wgDBmwschema;
1058                 if (!is_array($types))
1059                         $types = array($types);
1060                 if (! $schema )
1061                         $schema = $wgDBmwschema;
1062                 $etable = $this->addQuotes($table);
1063                 $eschema = $this->addQuotes($schema);
1064                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1065                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1066                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1067                 $res = $this->query( $SQL );
1068                 $count = $res ? $res->numRows() : 0;
1069                 if ($res)
1070                         $this->freeResult( $res );
1071                 return $count ? true : false;
1072         }
1073
1074         /*
1075          * For backward compatibility, this function checks both tables and
1076          * views.
1077          */
1078         function tableExists ($table, $schema = false) {
1079                 return $this->relationExists($table, array('r', 'v'), $schema);
1080         }
1081
1082         function sequenceExists ($sequence, $schema = false) {
1083                 return $this->relationExists($sequence, 'S', $schema);
1084         }
1085
1086         function triggerExists($table, $trigger) {
1087                 global $wgDBmwschema;
1088
1089                 $q = <<<END
1090         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1091                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1092                       AND tgrelid=pg_class.oid
1093                       AND nspname=%s AND relname=%s AND tgname=%s
1094 END;
1095                 $res = $this->query(sprintf($q,
1096                                 $this->addQuotes($wgDBmwschema),
1097                                 $this->addQuotes($table),
1098                                 $this->addQuotes($trigger)));
1099                 if (!$res)
1100                         return NULL;
1101                 $rows = $res->numRows();
1102                 $this->freeResult($res);
1103                 return $rows;
1104         }
1105
1106         function ruleExists($table, $rule) {
1107                 global $wgDBmwschema;
1108                 $exists = $this->selectField("pg_rules", "rulename",
1109                                 array(  "rulename" => $rule,
1110                                         "tablename" => $table,
1111                                         "schemaname" => $wgDBmwschema));
1112                 return $exists === $rule;
1113         }
1114
1115         function constraintExists($table, $constraint) {
1116                 global $wgDBmwschema;
1117                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1118                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1119                         $this->addQuotes($wgDBmwschema),
1120                         $this->addQuotes($table),
1121                         $this->addQuotes($constraint));
1122                 $res = $this->query($SQL);
1123                 if (!$res)
1124                         return NULL;
1125                 $rows = $res->numRows();
1126                 $this->freeResult($res);
1127                 return $rows;
1128         }
1129
1130         /**
1131          * Query whether a given schema exists. Returns the name of the owner
1132          */
1133         function schemaExists( $schema ) {
1134                 $eschema = preg_replace("/'/", "''", $schema);
1135                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1136                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1137                 $res = $this->query( $SQL );
1138                 if ( $res && $res->numRows() ) {
1139                         $row = $res->fetchObject();
1140                         $owner = $row->rolname;
1141                 } else {
1142                         $owner = false;
1143                 }
1144                 if ($res)
1145                         $this->freeResult($res);
1146                 return $owner;
1147         }
1148
1149         /**
1150          * Query whether a given column exists in the mediawiki schema
1151          */
1152         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1153                 global $wgDBmwschema;
1154                 $etable = preg_replace("/'/", "''", $table);
1155                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1156                 $ecol = preg_replace("/'/", "''", $field);
1157                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1158                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1159                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1160                 $res = $this->query( $SQL, $fname );
1161                 $count = $res ? $res->numRows() : 0;
1162                 if ($res)
1163                         $this->freeResult( $res );
1164                 return $count;
1165         }
1166
1167         function fieldInfo( $table, $field ) {
1168                 return PostgresField::fromText($this, $table, $field);
1169         }
1170
1171         function begin( $fname = 'DatabasePostgres::begin' ) {
1172                 $this->query( 'BEGIN', $fname );
1173                 $this->mTrxLevel = 1;
1174         }
1175         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1176                 return true;
1177         }
1178         function commit( $fname = 'DatabasePostgres::commit' ) {
1179                 $this->query( 'COMMIT', $fname );
1180                 $this->mTrxLevel = 0;
1181         }
1182
1183         /* Not even sure why this is used in the main codebase... */
1184         function limitResultForUpdate($sql, $num) {
1185                 return $sql;
1186         }
1187
1188         function setup_database() {
1189                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1190
1191                 // Make sure that we can write to the correct schema
1192                 // If not, Postgres will happily and silently go to the next search_path item
1193                 $ctest = "mediawiki_test_table";
1194                 $safeschema = $this->quote_ident($wgDBmwschema);
1195                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1196                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1197                 }
1198                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1199                 $olde = error_reporting( 0 );
1200                 $res = $this->doQuery($SQL);
1201                 error_reporting( $olde );
1202                 if (!$res) {
1203                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"</li>\n";
1204                         dieout("</ul>");
1205                 }
1206                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1207
1208                 $res = dbsource( "../maintenance/postgres/tables.sql", $this);
1209
1210                 ## Update version information
1211                 $mwv = $this->addQuotes($wgVersion);
1212                 $pgv = $this->addQuotes($this->getServerVersion());
1213                 $pgu = $this->addQuotes($this->mUser);
1214                 $mws = $this->addQuotes($wgDBmwschema);
1215                 $tss = $this->addQuotes($wgDBts2schema);
1216                 $pgp = $this->addQuotes($wgDBport);
1217                 $dbn = $this->addQuotes($this->mDBname);
1218                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
1219
1220                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
1221                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
1222                                 "ctype = '$ctype' ".
1223                                 "WHERE type = 'Creation'";
1224                 $this->query($SQL);
1225
1226                 ## Avoid the non-standard "REPLACE INTO" syntax
1227                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1228                 if ($f == false ) {
1229                         dieout( "<li>Could not find the interwiki.sql file");
1230                 }
1231                 ## We simply assume it is already empty as we have just created it
1232                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1233                 while ( ! feof( $f ) ) {
1234                         $line = fgets($f,1024);
1235                         $matches = array();
1236                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1237                                 continue;
1238                         }
1239                         $this->query("$SQL $matches[1],$matches[2])");
1240                 }
1241                 print " (table interwiki successfully populated)...\n";
1242
1243                 $this->doQuery("COMMIT");
1244         }
1245
1246         function encodeBlob( $b ) {
1247                 return new Blob ( pg_escape_bytea( $b ) ) ;
1248         }
1249
1250         function decodeBlob( $b ) {
1251                 if ($b instanceof Blob) {
1252                         $b = $b->fetch();
1253                 }
1254                 return pg_unescape_bytea( $b );
1255         }
1256
1257         function strencode( $s ) { ## Should not be called by us
1258                 return pg_escape_string( $s );
1259         }
1260
1261         function addQuotes( $s ) {
1262                 if ( is_null( $s ) ) {
1263                         return 'NULL';
1264                 } else if ($s instanceof Blob) {
1265                         return "'".$s->fetch($s)."'";
1266                 }
1267                 return "'" . pg_escape_string($s) . "'";
1268         }
1269
1270         function quote_ident( $s ) {
1271                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1272         }
1273
1274         /* For now, does nothing */
1275         function selectDB( $db ) {
1276                 return true;
1277         }
1278
1279         /**
1280          * Postgres specific version of replaceVars.
1281          * Calls the parent version in Database.php
1282          *
1283          * @private
1284          *
1285          * @param string $com SQL string, read from a stream (usually tables.sql)
1286          *
1287          * @return string SQL string
1288          */
1289         protected function replaceVars( $ins ) {
1290
1291                 $ins = parent::replaceVars( $ins );
1292
1293                 if ($this->numeric_version >= 8.3) {
1294                         // Thanks for not providing backwards-compatibility, 8.3
1295                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1296                 }
1297
1298                 if ($this->numeric_version <= 8.1) { // Our minimum version
1299                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1300                 }
1301
1302                 return $ins;
1303         }
1304
1305         /**
1306          * Various select options
1307          *
1308          * @private
1309          *
1310          * @param array $options an associative array of options to be turned into
1311          *              an SQL query, valid keys are listed in the function.
1312          * @return array
1313          */
1314         function makeSelectOptions( $options ) {
1315                 $preLimitTail = $postLimitTail = '';
1316                 $startOpts = $useIndex = '';
1317
1318                 $noKeyOptions = array();
1319                 foreach ( $options as $key => $option ) {
1320                         if ( is_numeric( $key ) ) {
1321                                 $noKeyOptions[$option] = true;
1322                         }
1323                 }
1324
1325                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1326                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1327                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1328
1329                 //if (isset($options['LIMIT'])) {
1330                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1331                 //              isset($options['OFFSET']) ? $options['OFFSET']
1332                 //              : false);
1333                 //}
1334
1335                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1336                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1337                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1338
1339                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1340         }
1341
1342         public function setTimeout( $timeout ) {
1343                 // @todo fixme no-op
1344         }
1345
1346         function ping() {
1347                 wfDebug( "Function ping() not written for DatabasePostgres.php yet");
1348                 return true;
1349         }
1350
1351         /**
1352          * How lagged is this slave?
1353          *
1354          */
1355         public function getLag() {
1356                 # Not implemented for PostgreSQL
1357                 return false;
1358         }
1359
1360         function setFakeSlaveLag( $lag ) {}
1361         function setFakeMaster( $enabled = true ) {}
1362
1363         function getDBname() {
1364                 return $this->mDBname;
1365         }
1366
1367         function getServer() {
1368                 return $this->mServer;
1369         }
1370
1371         function buildConcat( $stringList ) {
1372                 return implode( ' || ', $stringList );
1373         }
1374
1375         /* These are not used yet, but we know we don't want the default version */
1376
1377         public function lock( $lockName, $method ) {
1378                 return true;
1379         }
1380         public function unlock( $lockName, $method ) {
1381                 return true;
1382         }
1383
1384 } // end DatabasePostgres class