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         var $mAffectedRows = NULL;
  76
  77         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  78                 $failFunction = false, $flags = 0 )
  79         {
  80
  81                 global $wgOut;
  82                 # Can't get a reference if it hasn't been set yet
  83                 if ( !isset( $wgOut ) ) {
  84                         $wgOut = NULL;
  85                 }
  86                 $this->mOut =& $wgOut;
  87                 $this->mFailFunction = $failFunction;
  88                 $this->mFlags = $flags;
  89                 $this->open( $server, $user, $password, $dbName);
  90
  91         }
  92
  93         function cascadingDeletes() {
  94                 return true;
  95         }
  96         function cleanupTriggers() {
  97                 return true;
  98         }
  99         function strictIPs() {
 100                 return true;
 101         }
 102         function realTimestamps() {
 103                 return true;
 104         }
 105         function implicitGroupby() {
 106                 return false;
 107         }
 108         function implicitOrderby() {
 109                 return false;
 110         }
 111         function searchableIPs() {
 112                 return true;
 113         }
 114         function functionalIndexes() {
 115                 return true;
 116         }
 117
 118         function hasConstraint( $name ) {
 119                 global $wgDBmwschema;
 120                 $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) ."'";
 121                 return $this->numRows($res = $this->doQuery($SQL));
 122         }
 123
 124         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 125         {
 126                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 127         }
 128
 129         /**
 130          * Usually aborts on failure
 131          * If the failFunction is set to a non-zero integer, returns success
 132          */
 133         function open( $server, $user, $password, $dbName ) {
 134                 # Test for Postgres support, to avoid suppressed fatal error
 135                 if ( !function_exists( 'pg_connect' ) ) {
 136                         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" );
 137                 }
 138
 139                 global $wgDBport;
 140
 141                 if (!strlen($user)) { ## e.g. the class is being loaded
 142                         return;
 143                 }
 144
 145                 $this->close();
 146                 $this->mServer = $server;
 147                 $this->mPort = $port = $wgDBport;
 148                 $this->mUser = $user;
 149                 $this->mPassword = $password;
 150                 $this->mDBname = $dbName;
 151
 152                 $hstring="";
 153                 if ($server!=false && $server!="") {
 154                         $hstring="host=$server ";
 155                 }
 156                 if ($port!=false && $port!="") {
 157                         $hstring .= "port=$port ";
 158                 }
 159
 160                 error_reporting( E_ALL );
 161                 @$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
 162
 163                 if ( $this->mConn == false ) {
 164                         wfDebug( "DB connection error\n" );
 165                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 166                         wfDebug( $this->lastError()."\n" );
 167                         return false;
 168                 }
 169
 170                 $this->mOpened = true;
 171
 172                 global $wgCommandLineMode;
 173                 ## If called from the command-line (e.g. importDump), only show errors
 174                 if ($wgCommandLineMode) {
 175                         $this->doQuery("SET client_min_messages = 'ERROR'");
 176                 }
 177
 178                 global $wgDBmwschema, $wgDBts2schema;
 179                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 180                         && $wgDBmwschema !== 'mediawiki'
 181                         && preg_match( '/^\w+$/', $wgDBmwschema )
 182                         && preg_match( '/^\w+$/', $wgDBts2schema )
 183                 ) {
 184                         $safeschema = $this->quote_ident($wgDBmwschema);
 185                         $safeschema2 = $this->quote_ident($wgDBts2schema);
 186                         $this->doQuery("SET search_path = $safeschema, $wgDBts2schema, public");
 187                 }
 188
 189                 return $this->mConn;
 190         }
 191
 192
 193         function initial_setup($password, $dbName) {
 194                 // If this is the initial connection, setup the schema stuff and possibly create the user
 195                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
 196
 197                 print "<li>Checking the version of Postgres...";
 198                 $version = $this->getServerVersion();
 199                 $PGMINVER = '8.1';
 200                 if ($this->numeric_version < $PGMINVER) {
 201                         print "<b>FAILED</b>. Required version is $PGMINVER. You have $this->numeric_version ($version)</li>\n";
 202                         dieout("</ul>");
 203                 }
 204                 print "version $this->numeric_version is OK.</li>\n";
 205
 206                 $safeuser = $this->quote_ident($wgDBuser);
 207                 // Are we connecting as a superuser for the first time?
 208                 if ($wgDBsuperuser) {
 209                         // Are we really a superuser? Check out our rights
 210                         $SQL = "SELECT
 211                       CASE WHEN usesuper IS TRUE THEN
 212                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 213                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 214                     END AS rights
 215                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 216                         $rows = $this->numRows($res = $this->doQuery($SQL));
 217                         if (!$rows) {
 218                                 print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 219                                 dieout('</ul>');
 220                         }
 221                         $perms = pg_fetch_result($res, 0, 0);
 222
 223                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 224                         $rows = $this->numRows($this->doQuery($SQL));
 225                         if ($rows) {
 226                                 print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 227                         }
 228                         else {
 229                                 if ($perms != 1 and $perms != 3) {
 230                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 231                                         print 'Please use a different Postgres user.</li>';
 232                                         dieout('</ul>');
 233                                 }
 234                                 print "<li>Creating user <b>$wgDBuser</b>...";
 235                                 $safepass = $this->addQuotes($wgDBpassword);
 236                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 237                                 $this->doQuery($SQL);
 238                                 print "OK</li>\n";
 239                         }
 240                         // User now exists, check out the database
 241                         if ($dbName != $wgDBname) {
 242                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 243                                 $rows = $this->numRows($this->doQuery($SQL));
 244                                 if ($rows) {
 245                                         print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 246                                 }
 247                                 else {
 248                                         if ($perms < 2) {
 249                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 250                                                 print 'Please use a different Postgres user.</li>';
 251                                                 dieout('</ul>');
 252                                         }
 253                                         print "<li>Creating database <b>$wgDBname</b>...";
 254                                         $safename = $this->quote_ident($wgDBname);
 255                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 256                                         $this->doQuery($SQL);
 257                                         print "OK</li>\n";
 258                                         // Hopefully tsearch2 and plpgsql are in template1...
 259                                 }
 260
 261                                 // Reconnect to check out tsearch2 rights for this user
 262                                 print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 263
 264                                 $hstring="";
 265                                 if ($this->mServer!=false && $this->mServer!="") {
 266                                         $hstring="host=$this->mServer ";
 267                                 }
 268                                 if ($this->mPort!=false && $this->mPort!="") {
 269                                         $hstring .= "port=$this->mPort ";
 270                                 }
 271
 272                                 @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$wgDBsuperuser password=$password");
 273                                 if ( $this->mConn == false ) {
 274                                         print "<b>FAILED TO CONNECT!</b></li>";
 275                                         dieout("</ul>");
 276                                 }
 277                                 print "OK</li>\n";
 278                         }
 279
 280                         if ($this->numeric_version < 8.3) {
 281                                 // Tsearch2 checks
 282                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 283                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 284                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 285                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 286                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 287                                         dieout("</ul>");
 288                                 }
 289                                 print "OK</li>\n";
 290                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 291                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 292                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 293                                         $this->doQuery($SQL);
 294                                 }
 295                                 print "OK</li>\n";
 296                         }
 297
 298                         // Setup the schema for this user if needed
 299                         $result = $this->schemaExists($wgDBmwschema);
 300                         $safeschema = $this->quote_ident($wgDBmwschema);
 301                         if (!$result) {
 302                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 303                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 304                                 if (!$result) {
 305                                         print "<b>FAILED</b>.</li>\n";
 306                                         dieout("</ul>");
 307                                 }
 308                                 print "OK</li>\n";
 309                         }
 310                         else {
 311                                 print "<li>Schema already exists, explicitly granting rights...\n";
 312                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 313                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 314                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 315                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 316                                         "AND p.relkind IN ('r','S','v')\n";
 317                                 $SQL .= "UNION\n";
 318                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 319                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 320                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 321                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 322                                 $res = $this->doQuery($SQL);
 323                                 if (!$res) {
 324                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 325                                         dieout("</ul>");
 326                                 }
 327                                 $this->doQuery("SET search_path = $safeschema");
 328                                 $rows = $this->numRows($res);
 329                                 while ($rows) {
 330                                         $rows--;
 331                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 332                                 }
 333                                 print "OK</li>";
 334                         }
 335
 336                         // Install plpgsql if needed
 337                         $this->setup_plpgsql();
 338
 339                         $wgDBsuperuser = '';
 340                         return true; // Reconnect as regular user
 341
 342                 } // end superuser
 343
 344                 if (!defined('POSTGRES_SEARCHPATH')) {
 345
 346                         if ($this->numeric_version < 8.3) {
 347                                 // Do we have the basic tsearch2 table?
 348                                 print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 349                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 350                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 351                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 352                                         print " for instructions.</li>\n";
 353                                         dieout("</ul>");
 354                                 }
 355                                 print "OK</li>\n";
 356
 357                                 // Does this user have the rights to the tsearch2 tables?
 358                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 359                                 print "<li>Checking tsearch2 permissions...";
 360                                 // Let's check all four, just to be safe
 361                                 error_reporting( 0 );
 362                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 363                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 364                                 foreach ( $ts2tables AS $tname ) {
 365                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 366                                         $res = $this->doQuery($SQL);
 367                                         if (!$res) {
 368                                                 print "<b>FAILED</b> to access pg_ts_$tname. Make sure that the user ".
 369                                                         "\"$wgDBuser\" has SELECT access to all four tsearch2 tables</li>\n";
 370                                                 dieout("</ul>");
 371                                         }
 372                                 }
 373                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = '$ctype'";
 374                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 375                                 $res = $this->doQuery($SQL);
 376                                 error_reporting( E_ALL );
 377                                 if (!$res) {
 378                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 379                                         dieout("</ul>");
 380                                 }
 381                                 print "OK</li>";
 382
 383                                 // Will the current locale work? Can we force it to?
 384                                 print "<li>Verifying tsearch2 locale with $ctype...";
 385                                 $rows = $this->numRows($res);
 386                                 $resetlocale = 0;
 387                                 if (!$rows) {
 388                                         print "<b>not found</b></li>\n";
 389                                         print "<li>Attempting to set default tsearch2 locale to \"$ctype\"...";
 390                                         $resetlocale = 1;
 391                                 }
 392                                 else {
 393                                         $tsname = pg_fetch_result($res, 0, 0);
 394                                         if ($tsname != 'default') {
 395                                                 print "<b>not set to default ($tsname)</b>";
 396                                                 print "<li>Attempting to change tsearch2 default locale to \"$ctype\"...";
 397                                                 $resetlocale = 1;
 398                                         }
 399                                 }
 400                                 if ($resetlocale) {
 401                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
 402                                         $res = $this->doQuery($SQL);
 403                                         if (!$res) {
 404                                                 print "<b>FAILED</b>. ";
 405                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"</li>\n";
 406                                                 dieout("</ul>");
 407                                         }
 408                                         print "OK</li>";
 409                                 }
 410
 411                                 // Final test: try out a simple tsearch2 query
 412                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 413                                 $res = $this->doQuery($SQL);
 414                                 if (!$res) {
 415                                         print "<b>FAILED</b>. Specifically, \"$SQL\" did not work.</li>";
 416                                         dieout("</ul>");
 417                                 }
 418                                 print "OK</li>";
 419                         }
 420
 421                         // Install plpgsql if needed
 422                         $this->setup_plpgsql();
 423
 424                         // Does the schema already exist? Who owns it?
 425                         $result = $this->schemaExists($wgDBmwschema);
 426                         if (!$result) {
 427                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 428                                 error_reporting( 0 );
 429                                 $safeschema = $this->quote_ident($wgDBmwschema);
 430                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 431                                 error_reporting( E_ALL );
 432                                 if (!$result) {
 433                                         print "<b>FAILED</b>. The user \"$wgDBuser\" must be able to access the schema. ".
 434                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 435                                                 "different user, and then grant access to the \"$wgDBuser\" user.</li>\n";
 436                                         dieout("</ul>");
 437                                 }
 438                                 print "OK</li>\n";
 439                         }
 440                         else if ($result != $wgDBuser) {
 441                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$wgDBuser\". Not ideal.</li>\n";
 442                         }
 443                         else {
 444                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$wgDBuser\". Excellent.</li>\n";
 445                         }
 446
 447                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 448                         print "<li>Setting the timezone to GMT for user \"$wgDBuser\" ...";
 449                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 450                         $result = pg_query($this->mConn, $SQL);
 451                         if (!$result) {
 452                                 print "<b>FAILED</b>.</li>\n";
 453                                 dieout("</ul>");
 454                         }
 455                         print "OK</li>\n";
 456                         // Set for the rest of this session
 457                         $SQL = "SET timezone = 'GMT'";
 458                         $result = pg_query($this->mConn, $SQL);
 459                         if (!$result) {
 460                                 print "<li>Failed to set timezone</li>\n";
 461                                 dieout("</ul>");
 462                         }
 463
 464                         print "<li>Setting the datestyle to ISO, YMD for user \"$wgDBuser\" ...";
 465                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 466                         $result = pg_query($this->mConn, $SQL);
 467                         if (!$result) {
 468                                 print "<b>FAILED</b>.</li>\n";
 469                                 dieout("</ul>");
 470                         }
 471                         print "OK</li>\n";
 472                         // Set for the rest of this session
 473                         $SQL = "SET datestyle = 'ISO, YMD'";
 474                         $result = pg_query($this->mConn, $SQL);
 475                         if (!$result) {
 476                                 print "<li>Failed to set datestyle</li>\n";
 477                                 dieout("</ul>");
 478                         }
 479
 480                         // Fix up the search paths if needed
 481                         print "<li>Setting the search path for user \"$wgDBuser\" ...";
 482                         $path = $this->quote_ident($wgDBmwschema);
 483                         if ($wgDBts2schema !== $wgDBmwschema)
 484                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 485                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 486                                 $path .= ", public";
 487                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 488                         $result = pg_query($this->mConn, $SQL);
 489                         if (!$result) {
 490                                 print "<b>FAILED</b>.</li>\n";
 491                                 dieout("</ul>");
 492                         }
 493                         print "OK</li>\n";
 494                         // Set for the rest of this session
 495                         $SQL = "SET search_path = $path";
 496                         $result = pg_query($this->mConn, $SQL);
 497                         if (!$result) {
 498                                 print "<li>Failed to set search_path</li>\n";
 499                                 dieout("</ul>");
 500                         }
 501                         define( "POSTGRES_SEARCHPATH", $path );
 502                 }
 503         }
 504
 505
 506         function setup_plpgsql() {
 507                 print "<li>Checking for Pl/Pgsql ...";
 508                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 509                 $rows = $this->numRows($this->doQuery($SQL));
 510                 if ($rows < 1) {
 511                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 512                         print "not installed. Attempting to install Pl/Pgsql ...";
 513                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 514                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 515                         $rows = $this->numRows($this->doQuery($SQL));
 516                         if ($rows >= 1) {
 517                         $olde = error_reporting(0);
 518                                 error_reporting($olde - E_WARNING);
 519                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 520                                 error_reporting($olde);
 521                                 if (!$result) {
 522                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 523                                         dieout("</ul>");
 524                                 }
 525                         }
 526                         else {
 527                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 528                                 dieout("</ul>");
 529                         }
 530                 }
 531                 print "OK</li>\n";
 532         }
 533
 534
 535         /**
 536          * Closes a database connection, if it is open
 537          * Returns success, true if already closed
 538          */
 539         function close() {
 540                 $this->mOpened = false;
 541                 if ( $this->mConn ) {
 542                         return pg_close( $this->mConn );
 543                 } else {
 544                         return true;
 545                 }
 546         }
 547
 548         function doQuery( $sql ) {
 549                 if (function_exists('mb_convert_encoding')) {
 550                         $sql = mb_convert_encoding($sql,'UTF-8');
 551                 }
 552                 $this->mLastResult = pg_query( $this->mConn, $sql);
 553                 $this->mAffectedRows = NULL; // use pg_affected_rows(mLastResult)
 554                 return $this->mLastResult;
 555         }
 556
 557         function queryIgnore( $sql, $fname = '' ) {
 558                 return $this->query( $sql, $fname, true );
 559         }
 560
 561         function freeResult( $res ) {
 562                 if ( $res instanceof ResultWrapper ) {
 563                         $res = $res->result;
 564                 }
 565                 if ( !@pg_free_result( $res ) ) {
 566                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 567                 }
 568         }
 569
 570         function fetchObject( $res ) {
 571                 if ( $res instanceof ResultWrapper ) {
 572                         $res = $res->result;
 573                 }
 574                 @$row = pg_fetch_object( $res );
 575                 # FIXME: HACK HACK HACK HACK debug
 576
 577                 # TODO:
 578                 # hashar : not sure if the following test really trigger if the object
 579                 #          fetching failed.
 580                 if( pg_last_error($this->mConn) ) {
 581                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 582                 }
 583                 return $row;
 584         }
 585
 586         function fetchRow( $res ) {
 587                 if ( $res instanceof ResultWrapper ) {
 588                         $res = $res->result;
 589                 }
 590                 @$row = pg_fetch_array( $res );
 591                 if( pg_last_error($this->mConn) ) {
 592                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 593                 }
 594                 return $row;
 595         }
 596
 597         function numRows( $res ) {
 598                 if ( $res instanceof ResultWrapper ) {
 599                         $res = $res->result;
 600                 }
 601                 @$n = pg_num_rows( $res );
 602                 if( pg_last_error($this->mConn) ) {
 603                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 604                 }
 605                 return $n;
 606         }
 607         function numFields( $res ) {
 608                 if ( $res instanceof ResultWrapper ) {
 609                         $res = $res->result;
 610                 }
 611                 return pg_num_fields( $res );
 612         }
 613         function fieldName( $res, $n ) {
 614                 if ( $res instanceof ResultWrapper ) {
 615                         $res = $res->result;
 616                 }
 617                 return pg_field_name( $res, $n );
 618         }
 619
 620         /**
 621          * This must be called after nextSequenceVal
 622          */
 623         function insertId() {
 624                 return $this->mInsertId;
 625         }
 626
 627         function dataSeek( $res, $row ) {
 628                 if ( $res instanceof ResultWrapper ) {
 629                         $res = $res->result;
 630                 }
 631                 return pg_result_seek( $res, $row );
 632         }
 633
 634         function lastError() {
 635                 if ( $this->mConn ) {
 636                         return pg_last_error();
 637                 }
 638                 else {
 639                         return "No database connection";
 640                 }
 641         }
 642         function lastErrno() {
 643                 return pg_last_error() ? 1 : 0;
 644         }
 645
 646         function affectedRows() {
 647                 if ( !is_null( $this->mAffectedRows ) ) {
 648                         // Forced result for simulated queries
 649                         return $this->mAffectedRows;
 650                 }
 651                 if( empty( $this->mLastResult ) )
 652                         return 0;
 653                 return pg_affected_rows( $this->mLastResult );
 654         }
 655
 656         /**
 657          * Estimate rows in dataset
 658          * Returns estimated count, based on EXPLAIN output
 659          * This is not necessarily an accurate estimate, so use sparingly
 660          * Returns -1 if count cannot be found
 661          * Takes same arguments as Database::select()
 662          */
 663
 664         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
 665                 $options['EXPLAIN'] = true;
 666                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 667                 $rows = -1;
 668                 if ( $res ) {
 669                         $row = $this->fetchRow( $res );
 670                         $count = array();
 671                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 672                                 $rows = $count[1];
 673                         }
 674                         $this->freeResult($res);
 675                 }
 676                 return $rows;
 677         }
 678
 679
 680         /**
 681          * Returns information about an index
 682          * If errors are explicitly ignored, returns NULL on failure
 683          */
 684         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 685                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 686                 $res = $this->query( $sql, $fname );
 687                 if ( !$res ) {
 688                         return NULL;
 689                 }
 690                 while ( $row = $this->fetchObject( $res ) ) {
 691                         if ( $row->indexname == $index ) {
 692                                 return $row;
 693                         }
 694                 }
 695                 return false;
 696         }
 697
 698         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 699                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 700                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 701                 $res = $this->query( $sql, $fname );
 702                 if ( !$res )
 703                         return NULL;
 704                 while ($row = $this->fetchObject( $res ))
 705                         return true;
 706                 return false;
 707
 708         }
 709
 710         /**
 711          * INSERT wrapper, inserts an array into a table
 712          *
 713          * $args may be a single associative array, or an array of these with numeric keys,
 714          * for multi-row insert (Postgres version 8.2 and above only).
 715          *
 716          * @param array $table   String: Name of the table to insert to.
 717          * @param array $args    Array: Items to insert into the table.
 718          * @param array $fname   String: Name of the function, for profiling
 719          * @param mixed $options String or Array. Valid options: IGNORE
 720          *
 721          * @return bool Success of insert operation. IGNORE always returns true.
 722          */
 723         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 724                 global $wgDBversion;
 725
 726                 if ( !count( $args ) ) {
 727                         return true;
 728                 }
 729
 730                 $table = $this->tableName( $table );
 731                 if (! isset( $wgDBversion ) ) {
 732                         $this->getServerVersion();
 733                         $wgDBversion = $this->numeric_version;
 734                 }
 735
 736                 if ( !is_array( $options ) )
 737                         $options = array( $options );
 738
 739                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 740                         $multi = true;
 741                         $keys = array_keys( $args[0] );
 742                 }
 743                 else {
 744                         $multi = false;
 745                         $keys = array_keys( $args );
 746                 }
 747
 748                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 749                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 750
 751                 // If we are not in a transaction, we need to be for savepoint trickery
 752                 $didbegin = 0;
 753                 if ( $ignore ) {
 754                         if (! $this->mTrxLevel) {
 755                                 $this->begin();
 756                                 $didbegin = 1;
 757                         }
 758                         $olde = error_reporting( 0 );
 759                         // For future use, we may want to track the number of actual inserts
 760                         // Right now, insert (all writes) simply return true/false
 761                         $numrowsinserted = 0;
 762                 }
 763
 764                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 765
 766                 if ( $multi ) {
 767                         if ( $wgDBversion >= 8.2 && !$ignore ) {
 768                                 $first = true;
 769                                 foreach ( $args as $row ) {
 770                                         if ( $first ) {
 771                                                 $first = false;
 772                                         } else {
 773                                                 $sql .= ',';
 774                                         }
 775                                         $sql .= '(' . $this->makeList( $row ) . ')';
 776                                 }
 777                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 778                         }
 779                         else {
 780                                 $res = true;
 781                                 $origsql = $sql;
 782                                 foreach ( $args as $row ) {
 783                                         $tempsql = $origsql;
 784                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 785
 786                                         if ( $ignore ) {
 787                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 788                                         }
 789
 790                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 791
 792                                         if ( $ignore ) {
 793                                                 $bar = pg_last_error();
 794                                                 if ($bar != false) {
 795                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 796                                                 }
 797                                                 else {
 798                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 799                                                         $numrowsinserted++;
 800                                                 }
 801                                         }
 802
 803                                         // If any of them fail, we fail overall for this function call
 804                                         // Note that this will be ignored if IGNORE is set
 805                                         if (! $tempres)
 806                                                 $res = false;
 807                                 }
 808                         }
 809                 }
 810                 else {
 811                         // Not multi, just a lone insert
 812                         if ( $ignore ) {
 813                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 814                         }
 815
 816                         $sql .= '(' . $this->makeList( $args ) . ')';
 817                         $res = (bool)$this->query( $sql, $fname, $ignore );
 818                         if ( $ignore ) {
 819                                 $bar = pg_last_error();
 820                                 if ($bar != false) {
 821                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 822                                 }
 823                                 else {
 824                                         pg_query( $this->mConn, "RELEASE $ignore" );
 825                                         $numrowsinserted++;
 826                                 }
 827                         }
 828                 }
 829                 if ( $ignore ) {
 830                         $olde = error_reporting( $olde );
 831                         if ($didbegin) {
 832                                 $this->commit();
 833                         }
 834
 835                         // Set the affected row count for the whole operation
 836                         $this->mAffectedRows = $numrowsinserted;
 837
 838                         // IGNORE always returns true
 839                         return true;
 840                 }
 841
 842
 843                 return $res;
 844
 845         }
 846
 847         function tableName( $name ) {
 848                 # Replace reserved words with better ones
 849                 switch( $name ) {
 850                         case 'user':
 851                                 return 'mwuser';
 852                         case 'text':
 853                                 return 'pagecontent';
 854                         default:
 855                                 return $name;
 856                 }
 857         }
 858
 859         /**
 860          * Return the next in a sequence, save the value for retrieval via insertId()
 861          */
 862         function nextSequenceValue( $seqName ) {
 863                 $safeseq = preg_replace( "/'/", "''", $seqName );
 864                 $res = $this->query( "SELECT nextval('$safeseq')" );
 865                 $row = $this->fetchRow( $res );
 866                 $this->mInsertId = $row[0];
 867                 $this->freeResult( $res );
 868                 return $this->mInsertId;
 869         }
 870
 871         /**
 872          * Return the current value of a sequence. Assumes it has ben nextval'ed in this session.
 873          */
 874         function currentSequenceValue( $seqName ) {
 875                 $safeseq = preg_replace( "/'/", "''", $seqName );
 876                 $res = $this->query( "SELECT currval('$safeseq')" );
 877                 $row = $this->fetchRow( $res );
 878                 $currval = $row[0];
 879                 $this->freeResult( $res );
 880                 return $currval;
 881         }
 882
 883         /**
 884          * Postgres does not have a "USE INDEX" clause, so return an empty string
 885          */
 886         function useIndexClause( $index ) {
 887                 return '';
 888         }
 889
 890         # REPLACE query wrapper
 891         # Postgres simulates this with a DELETE followed by INSERT
 892         # $row is the row to insert, an associative array
 893         # $uniqueIndexes is an array of indexes. Each element may be either a
 894         # field name or an array of field names
 895         #
 896         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 897         # However if you do this, you run the risk of encountering errors which wouldn't have
 898         # occurred in MySQL
 899         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 900                 $table = $this->tableName( $table );
 901
 902                 if (count($rows)==0) {
 903                         return;
 904                 }
 905
 906                 # Single row case
 907                 if ( !is_array( reset( $rows ) ) ) {
 908                         $rows = array( $rows );
 909                 }
 910
 911                 foreach( $rows as $row ) {
 912                         # Delete rows which collide
 913                         if ( $uniqueIndexes ) {
 914                                 $sql = "DELETE FROM $table WHERE ";
 915                                 $first = true;
 916                                 foreach ( $uniqueIndexes as $index ) {
 917                                         if ( $first ) {
 918                                                 $first = false;
 919                                                 $sql .= "(";
 920                                         } else {
 921                                                 $sql .= ') OR (';
 922                                         }
 923                                         if ( is_array( $index ) ) {
 924                                                 $first2 = true;
 925                                                 foreach ( $index as $col ) {
 926                                                         if ( $first2 ) {
 927                                                                 $first2 = false;
 928                                                         } else {
 929                                                                 $sql .= ' AND ';
 930                                                         }
 931                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 932                                                 }
 933                                         } else {
 934                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 935                                         }
 936                                 }
 937                                 $sql .= ')';
 938                                 $this->query( $sql, $fname );
 939                         }
 940
 941                         # Now insert the row
 942                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 943                                 $this->makeList( $row, LIST_COMMA ) . ')';
 944                         $this->query( $sql, $fname );
 945                 }
 946         }
 947
 948         # DELETE where the condition is a join
 949         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 950                 if ( !$conds ) {
 951                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 952                 }
 953
 954                 $delTable = $this->tableName( $delTable );
 955                 $joinTable = $this->tableName( $joinTable );
 956                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 957                 if ( $conds != '*' ) {
 958                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 959                 }
 960                 $sql .= ')';
 961
 962                 $this->query( $sql, $fname );
 963         }
 964
 965         # Returns the size of a text field, or -1 for "unlimited"
 966         function textFieldSize( $table, $field ) {
 967                 $table = $this->tableName( $table );
 968                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 969                         FROM pg_class c, pg_attribute a, pg_type t
 970                         WHERE relname='$table' AND a.attrelid=c.oid AND
 971                                 a.atttypid=t.oid and a.attname='$field'";
 972                 $res =$this->query($sql);
 973                 $row=$this->fetchObject($res);
 974                 if ($row->ftype=="varchar") {
 975                         $size=$row->size-4;
 976                 } else {
 977                         $size=$row->size;
 978                 }
 979                 $this->freeResult( $res );
 980                 return $size;
 981         }
 982
 983         function lowPriorityOption() {
 984                 return '';
 985         }
 986
 987         function limitResult($sql, $limit, $offset=false) {
 988                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 989         }
 990
 991         /**
 992          * Returns an SQL expression for a simple conditional.
 993          * Uses CASE on Postgres
 994          *
 995          * @param string $cond SQL expression which will result in a boolean value
 996          * @param string $trueVal SQL expression to return if true
 997          * @param string $falseVal SQL expression to return if false
 998          * @return string SQL fragment
 999          */
1000         function conditional( $cond, $trueVal, $falseVal ) {
1001                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
1002         }
1003
1004         function wasDeadlock() {
1005                 return $this->lastErrno() == '40P01';
1006         }
1007
1008         function timestamp( $ts=0 ) {
1009                 return wfTimestamp(TS_POSTGRES,$ts);
1010         }
1011
1012         /**
1013          * Return aggregated value function call
1014          */
1015         function aggregateValue ($valuedata,$valuename='value') {
1016                 return $valuedata;
1017         }
1018
1019
1020         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1021                 // Ignore errors during error handling to avoid infinite recursion
1022                 $ignore = $this->ignoreErrors( true );
1023                 $this->mErrorCount++;
1024
1025                 if ($ignore || $tempIgnore) {
1026                         wfDebug("SQL ERROR (ignored): $error\n");
1027                         $this->ignoreErrors( $ignore );
1028                 }
1029                 else {
1030                         $message = "A database error has occurred\n" .
1031                                 "Query: $sql\n" .
1032                                 "Function: $fname\n" .
1033                                 "Error: $errno $error\n";
1034                         throw new DBUnexpectedError($this, $message);
1035                 }
1036         }
1037
1038         /**
1039          * @return string wikitext of a link to the server software's web site
1040          */
1041                 function getSoftwareLink() {
1042                 return "[http://www.postgresql.org/ PostgreSQL]";
1043         }
1044
1045         /**
1046          * @return string Version information from the database
1047          */
1048         function getServerVersion() {
1049                 $version = pg_fetch_result($this->doQuery("SELECT version()"),0,0);
1050                 $thisver = array();
1051                 if (!preg_match('/PostgreSQL (\d+\.\d+)(\S+)/', $version, $thisver)) {
1052                         die("Could not determine the numeric version from $version!");
1053                 }
1054                 $this->numeric_version = $thisver[1];
1055                 return $version;
1056         }
1057
1058
1059         /**
1060          * Query whether a given relation exists (in the given schema, or the
1061          * default mw one if not given)
1062          */
1063         function relationExists( $table, $types, $schema = false ) {
1064                 global $wgDBmwschema;
1065                 if (!is_array($types))
1066                         $types = array($types);
1067                 if (! $schema )
1068                         $schema = $wgDBmwschema;
1069                 $etable = $this->addQuotes($table);
1070                 $eschema = $this->addQuotes($schema);
1071                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1072                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1073                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1074                 $res = $this->query( $SQL );
1075                 $count = $res ? $res->numRows() : 0;
1076                 if ($res)
1077                         $this->freeResult( $res );
1078                 return $count ? true : false;
1079         }
1080
1081         /*
1082          * For backward compatibility, this function checks both tables and
1083          * views.
1084          */
1085         function tableExists ($table, $schema = false) {
1086                 return $this->relationExists($table, array('r', 'v'), $schema);
1087         }
1088
1089         function sequenceExists ($sequence, $schema = false) {
1090                 return $this->relationExists($sequence, 'S', $schema);
1091         }
1092
1093         function triggerExists($table, $trigger) {
1094                 global $wgDBmwschema;
1095
1096                 $q = <<<END
1097         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1098                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1099                       AND tgrelid=pg_class.oid
1100                       AND nspname=%s AND relname=%s AND tgname=%s
1101 END;
1102                 $res = $this->query(sprintf($q,
1103                                 $this->addQuotes($wgDBmwschema),
1104                                 $this->addQuotes($table),
1105                                 $this->addQuotes($trigger)));
1106                 if (!$res)
1107                         return NULL;
1108                 $rows = $res->numRows();
1109                 $this->freeResult($res);
1110                 return $rows;
1111         }
1112
1113         function ruleExists($table, $rule) {
1114                 global $wgDBmwschema;
1115                 $exists = $this->selectField("pg_rules", "rulename",
1116                                 array(  "rulename" => $rule,
1117                                         "tablename" => $table,
1118                                         "schemaname" => $wgDBmwschema));
1119                 return $exists === $rule;
1120         }
1121
1122         function constraintExists($table, $constraint) {
1123                 global $wgDBmwschema;
1124                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1125                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1126                         $this->addQuotes($wgDBmwschema),
1127                         $this->addQuotes($table),
1128                         $this->addQuotes($constraint));
1129                 $res = $this->query($SQL);
1130                 if (!$res)
1131                         return NULL;
1132                 $rows = $res->numRows();
1133                 $this->freeResult($res);
1134                 return $rows;
1135         }
1136
1137         /**
1138          * Query whether a given schema exists. Returns the name of the owner
1139          */
1140         function schemaExists( $schema ) {
1141                 $eschema = preg_replace("/'/", "''", $schema);
1142                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1143                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1144                 $res = $this->query( $SQL );
1145                 if ( $res && $res->numRows() ) {
1146                         $row = $res->fetchObject();
1147                         $owner = $row->rolname;
1148                 } else {
1149                         $owner = false;
1150                 }
1151                 if ($res)
1152                         $this->freeResult($res);
1153                 return $owner;
1154         }
1155
1156         /**
1157          * Query whether a given column exists in the mediawiki schema
1158          */
1159         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1160                 global $wgDBmwschema;
1161                 $etable = preg_replace("/'/", "''", $table);
1162                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1163                 $ecol = preg_replace("/'/", "''", $field);
1164                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1165                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1166                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1167                 $res = $this->query( $SQL, $fname );
1168                 $count = $res ? $res->numRows() : 0;
1169                 if ($res)
1170                         $this->freeResult( $res );
1171                 return $count;
1172         }
1173
1174         function fieldInfo( $table, $field ) {
1175                 return PostgresField::fromText($this, $table, $field);
1176         }
1177
1178         /**
1179          * pg_field_type() wrapper
1180          */
1181         function fieldType( $res, $index ) {
1182                 if ( $res instanceof ResultWrapper ) {
1183                         $res = $res->result;
1184                 }
1185                 return pg_field_type( $res, $index );
1186         }
1187
1188         function begin( $fname = 'DatabasePostgres::begin' ) {
1189                 $this->query( 'BEGIN', $fname );
1190                 $this->mTrxLevel = 1;
1191         }
1192         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1193                 return true;
1194         }
1195         function commit( $fname = 'DatabasePostgres::commit' ) {
1196                 $this->query( 'COMMIT', $fname );
1197                 $this->mTrxLevel = 0;
1198         }
1199
1200         /* Not even sure why this is used in the main codebase... */
1201         function limitResultForUpdate($sql, $num) {
1202                 return $sql;
1203         }
1204
1205         function setup_database() {
1206                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1207
1208                 // Make sure that we can write to the correct schema
1209                 // If not, Postgres will happily and silently go to the next search_path item
1210                 $ctest = "mediawiki_test_table";
1211                 $safeschema = $this->quote_ident($wgDBmwschema);
1212                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1213                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1214                 }
1215                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1216                 $olde = error_reporting( 0 );
1217                 $res = $this->doQuery($SQL);
1218                 error_reporting( $olde );
1219                 if (!$res) {
1220                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"</li>\n";
1221                         dieout("</ul>");
1222                 }
1223                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1224
1225                 $res = dbsource( "../maintenance/postgres/tables.sql", $this);
1226
1227                 ## Update version information
1228                 $mwv = $this->addQuotes($wgVersion);
1229                 $pgv = $this->addQuotes($this->getServerVersion());
1230                 $pgu = $this->addQuotes($this->mUser);
1231                 $mws = $this->addQuotes($wgDBmwschema);
1232                 $tss = $this->addQuotes($wgDBts2schema);
1233                 $pgp = $this->addQuotes($wgDBport);
1234                 $dbn = $this->addQuotes($this->mDBname);
1235                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
1236
1237                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
1238                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
1239                                 "ctype = '$ctype' ".
1240                                 "WHERE type = 'Creation'";
1241                 $this->query($SQL);
1242
1243                 ## Avoid the non-standard "REPLACE INTO" syntax
1244                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1245                 if ($f == false ) {
1246                         dieout( "<li>Could not find the interwiki.sql file");
1247                 }
1248                 ## We simply assume it is already empty as we have just created it
1249                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1250                 while ( ! feof( $f ) ) {
1251                         $line = fgets($f,1024);
1252                         $matches = array();
1253                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1254                                 continue;
1255                         }
1256                         $this->query("$SQL $matches[1],$matches[2])");
1257                 }
1258                 print " (table interwiki successfully populated)...\n";
1259
1260                 $this->doQuery("COMMIT");
1261         }
1262
1263         function encodeBlob( $b ) {
1264                 return new Blob ( pg_escape_bytea( $b ) ) ;
1265         }
1266
1267         function decodeBlob( $b ) {
1268                 if ($b instanceof Blob) {
1269                         $b = $b->fetch();
1270                 }
1271                 return pg_unescape_bytea( $b );
1272         }
1273
1274         function strencode( $s ) { ## Should not be called by us
1275                 return pg_escape_string( $s );
1276         }
1277
1278         function addQuotes( $s ) {
1279                 if ( is_null( $s ) ) {
1280                         return 'NULL';
1281                 } else if ( is_bool( $s ) ) {
1282                         return intval( $s );
1283                 } else if ($s instanceof Blob) {
1284                         return "'".$s->fetch($s)."'";
1285                 }
1286                 return "'" . pg_escape_string($s) . "'";
1287         }
1288
1289         function quote_ident( $s ) {
1290                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1291         }
1292
1293         /* For now, does nothing */
1294         function selectDB( $db ) {
1295                 return true;
1296         }
1297
1298         /**
1299          * Postgres specific version of replaceVars.
1300          * Calls the parent version in Database.php
1301          *
1302          * @private
1303          *
1304          * @param string $com SQL string, read from a stream (usually tables.sql)
1305          *
1306          * @return string SQL string
1307          */
1308         protected function replaceVars( $ins ) {
1309
1310                 $ins = parent::replaceVars( $ins );
1311
1312                 if ($this->numeric_version >= 8.3) {
1313                         // Thanks for not providing backwards-compatibility, 8.3
1314                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1315                 }
1316
1317                 if ($this->numeric_version <= 8.1) { // Our minimum version
1318                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1319                 }
1320
1321                 return $ins;
1322         }
1323
1324         /**
1325          * Various select options
1326          *
1327          * @private
1328          *
1329          * @param array $options an associative array of options to be turned into
1330          *              an SQL query, valid keys are listed in the function.
1331          * @return array
1332          */
1333         function makeSelectOptions( $options ) {
1334                 $preLimitTail = $postLimitTail = '';
1335                 $startOpts = $useIndex = '';
1336
1337                 $noKeyOptions = array();
1338                 foreach ( $options as $key => $option ) {
1339                         if ( is_numeric( $key ) ) {
1340                                 $noKeyOptions[$option] = true;
1341                         }
1342                 }
1343
1344                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1345                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1346                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1347
1348                 //if (isset($options['LIMIT'])) {
1349                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1350                 //              isset($options['OFFSET']) ? $options['OFFSET']
1351                 //              : false);
1352                 //}
1353
1354                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1355                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1356                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1357
1358                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1359         }
1360
1361         public function setTimeout( $timeout ) {
1362                 // @todo fixme no-op
1363         }
1364
1365         function ping() {
1366                 wfDebug( "Function ping() not written for DatabasePostgres.php yet");
1367                 return true;
1368         }
1369
1370         /**
1371          * How lagged is this slave?
1372          *
1373          */
1374         public function getLag() {
1375                 # Not implemented for PostgreSQL
1376                 return false;
1377         }
1378
1379         function setFakeSlaveLag( $lag ) {}
1380         function setFakeMaster( $enabled = true ) {}
1381
1382         function getDBname() {
1383                 return $this->mDBname;
1384         }
1385
1386         function getServer() {
1387                 return $this->mServer;
1388         }
1389
1390         function buildConcat( $stringList ) {
1391                 return implode( ' || ', $stringList );
1392         }
1393
1394         /* These are not used yet, but we know we don't want the default version */
1395
1396         public function lock( $lockName, $method ) {
1397                 return true;
1398         }
1399         public function unlock( $lockName, $method ) {
1400                 return true;
1401         }
1402
1403         public function getSearchEngine() {
1404                 return "SearchPostgres";
1405         }
1406
1407 } // end DatabasePostgres class