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                 $this->mFailFunction = $failFunction;
  82                 $this->mFlags = $flags;
  83                 $this->open( $server, $user, $password, $dbName);
  84
  85         }
  86
  87         function cascadingDeletes() {
  88                 return true;
  89         }
  90         function cleanupTriggers() {
  91                 return true;
  92         }
  93         function strictIPs() {
  94                 return true;
  95         }
  96         function realTimestamps() {
  97                 return true;
  98         }
  99         function implicitGroupby() {
 100                 return false;
 101         }
 102         function implicitOrderby() {
 103                 return false;
 104         }
 105         function searchableIPs() {
 106                 return true;
 107         }
 108         function functionalIndexes() {
 109                 return true;
 110         }
 111
 112         function hasConstraint( $name ) {
 113                 global $wgDBmwschema;
 114                 $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) ."'";
 115                 return $this->numRows($res = $this->doQuery($SQL));
 116         }
 117
 118         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 119         {
 120                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 121         }
 122
 123         /**
 124          * Usually aborts on failure
 125          * If the failFunction is set to a non-zero integer, returns success
 126          */
 127         function open( $server, $user, $password, $dbName ) {
 128                 # Test for Postgres support, to avoid suppressed fatal error
 129                 if ( !function_exists( 'pg_connect' ) ) {
 130                         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" );
 131                 }
 132
 133                 global $wgDBport;
 134
 135                 $this->close();
 136                 $this->mServer = $server;
 137                 $this->mPort = $port = $wgDBport;
 138                 $this->mUser = $user;
 139                 $this->mPassword = $password;
 140                 $this->mDBname = $dbName;
 141
 142                 $connectVars = array(
 143                         'dbname' => $dbName,
 144                         'user' => $user,
 145                         'password' => $password );
 146                 if ($server!=false && $server!="") {
 147                         $connectVars['host'] = $server;
 148                 }
 149                 if ($port!=false && $port!="") {
 150                         $connectVars['port'] = $port;
 151                 }
 152                 $connectString = $this->makeConnectionString( $connectVars );
 153
 154                 $this->installErrorHandler();
 155                 $this->mConn = pg_connect( $connectString );
 156                 $phpError = $this->restoreErrorHandler();
 157
 158                 if ( $this->mConn == false ) {
 159                         wfDebug( "DB connection error\n" );
 160                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 161                         wfDebug( $this->lastError()."\n" );
 162                         if ( !$this->mFailFunction ) {
 163                                 throw new DBConnectionError( $this, $phpError );
 164                         } else {
 165                                 return false;
 166                         }
 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         function makeConnectionString( $vars ) {
 192                 $s = '';
 193                 foreach ( $vars as $name => $value ) {
 194                         $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
 195                 }
 196                 return $s;
 197         }
 198
 199
 200         function initial_setup($password, $dbName) {
 201                 // If this is the initial connection, setup the schema stuff and possibly create the user
 202                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
 203
 204                 print "<li>Checking the version of Postgres...";
 205                 $version = $this->getServerVersion();
 206                 $PGMINVER = '8.1';
 207                 if ($version < $PGMINVER) {
 208                         print "<b>FAILED</b>. Required version is $PGMINVER. You have $version</li>\n";
 209                         dieout("</ul>");
 210                 }
 211                 print "version $this->numeric_version is OK.</li>\n";
 212
 213                 $safeuser = $this->quote_ident($wgDBuser);
 214                 // Are we connecting as a superuser for the first time?
 215                 if ($wgDBsuperuser) {
 216                         // Are we really a superuser? Check out our rights
 217                         $SQL = "SELECT
 218                       CASE WHEN usesuper IS TRUE THEN
 219                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 220                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 221                     END AS rights
 222                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 223                         $rows = $this->numRows($res = $this->doQuery($SQL));
 224                         if (!$rows) {
 225                                 print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 226                                 dieout('</ul>');
 227                         }
 228                         $perms = pg_fetch_result($res, 0, 0);
 229
 230                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 231                         $rows = $this->numRows($this->doQuery($SQL));
 232                         if ($rows) {
 233                                 print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 234                         }
 235                         else {
 236                                 if ($perms != 1 and $perms != 3) {
 237                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 238                                         print 'Please use a different Postgres user.</li>';
 239                                         dieout('</ul>');
 240                                 }
 241                                 print "<li>Creating user <b>$wgDBuser</b>...";
 242                                 $safepass = $this->addQuotes($wgDBpassword);
 243                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 244                                 $this->doQuery($SQL);
 245                                 print "OK</li>\n";
 246                         }
 247                         // User now exists, check out the database
 248                         if ($dbName != $wgDBname) {
 249                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 250                                 $rows = $this->numRows($this->doQuery($SQL));
 251                                 if ($rows) {
 252                                         print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 253                                 }
 254                                 else {
 255                                         if ($perms < 2) {
 256                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 257                                                 print 'Please use a different Postgres user.</li>';
 258                                                 dieout('</ul>');
 259                                         }
 260                                         print "<li>Creating database <b>$wgDBname</b>...";
 261                                         $safename = $this->quote_ident($wgDBname);
 262                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 263                                         $this->doQuery($SQL);
 264                                         print "OK</li>\n";
 265                                         // Hopefully tsearch2 and plpgsql are in template1...
 266                                 }
 267
 268                                 // Reconnect to check out tsearch2 rights for this user
 269                                 print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 270
 271                                 $hstring="";
 272                                 if ($this->mServer!=false && $this->mServer!="") {
 273                                         $hstring="host=$this->mServer ";
 274                                 }
 275                                 if ($this->mPort!=false && $this->mPort!="") {
 276                                         $hstring .= "port=$this->mPort ";
 277                                 }
 278
 279                                 @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$wgDBsuperuser password=$password");
 280                                 if ( $this->mConn == false ) {
 281                                         print "<b>FAILED TO CONNECT!</b></li>";
 282                                         dieout("</ul>");
 283                                 }
 284                                 print "OK</li>\n";
 285                         }
 286
 287                         if ($this->numeric_version < 8.3) {
 288                                 // Tsearch2 checks
 289                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 290                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 291                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 292                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 293                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 294                                         dieout("</ul>");
 295                                 }
 296                                 print "OK</li>\n";
 297                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 298                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 299                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 300                                         $this->doQuery($SQL);
 301                                 }
 302                                 print "OK</li>\n";
 303                         }
 304
 305                         // Setup the schema for this user if needed
 306                         $result = $this->schemaExists($wgDBmwschema);
 307                         $safeschema = $this->quote_ident($wgDBmwschema);
 308                         if (!$result) {
 309                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 310                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 311                                 if (!$result) {
 312                                         print "<b>FAILED</b>.</li>\n";
 313                                         dieout("</ul>");
 314                                 }
 315                                 print "OK</li>\n";
 316                         }
 317                         else {
 318                                 print "<li>Schema already exists, explicitly granting rights...\n";
 319                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 320                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 321                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 322                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 323                                         "AND p.relkind IN ('r','S','v')\n";
 324                                 $SQL .= "UNION\n";
 325                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 326                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 327                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 328                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 329                                 $res = $this->doQuery($SQL);
 330                                 if (!$res) {
 331                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 332                                         dieout("</ul>");
 333                                 }
 334                                 $this->doQuery("SET search_path = $safeschema");
 335                                 $rows = $this->numRows($res);
 336                                 while ($rows) {
 337                                         $rows--;
 338                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 339                                 }
 340                                 print "OK</li>";
 341                         }
 342
 343                         // Install plpgsql if needed
 344                         $this->setup_plpgsql();
 345
 346                         $wgDBsuperuser = '';
 347                         return true; // Reconnect as regular user
 348
 349                 } // end superuser
 350
 351                 if (!defined('POSTGRES_SEARCHPATH')) {
 352
 353                         if ($this->numeric_version < 8.3) {
 354                                 // Do we have the basic tsearch2 table?
 355                                 print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 356                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 357                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 358                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 359                                         print " for instructions.</li>\n";
 360                                         dieout("</ul>");
 361                                 }
 362                                 print "OK</li>\n";
 363
 364                                 // Does this user have the rights to the tsearch2 tables?
 365                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 366                                 print "<li>Checking tsearch2 permissions...";
 367                                 // Let's check all four, just to be safe
 368                                 error_reporting( 0 );
 369                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 370                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 371                                 foreach ( $ts2tables AS $tname ) {
 372                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 373                                         $res = $this->doQuery($SQL);
 374                                         if (!$res) {
 375                                                 print "<b>FAILED</b> to access pg_ts_$tname. Make sure that the user ".
 376                                                         "\"$wgDBuser\" has SELECT access to all four tsearch2 tables</li>\n";
 377                                                 dieout("</ul>");
 378                                         }
 379                                 }
 380                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = '$ctype'";
 381                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 382                                 $res = $this->doQuery($SQL);
 383                                 error_reporting( E_ALL );
 384                                 if (!$res) {
 385                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 386                                         dieout("</ul>");
 387                                 }
 388                                 print "OK</li>";
 389
 390                                 // Will the current locale work? Can we force it to?
 391                                 print "<li>Verifying tsearch2 locale with $ctype...";
 392                                 $rows = $this->numRows($res);
 393                                 $resetlocale = 0;
 394                                 if (!$rows) {
 395                                         print "<b>not found</b></li>\n";
 396                                         print "<li>Attempting to set default tsearch2 locale to \"$ctype\"...";
 397                                         $resetlocale = 1;
 398                                 }
 399                                 else {
 400                                         $tsname = pg_fetch_result($res, 0, 0);
 401                                         if ($tsname != 'default') {
 402                                                 print "<b>not set to default ($tsname)</b>";
 403                                                 print "<li>Attempting to change tsearch2 default locale to \"$ctype\"...";
 404                                                 $resetlocale = 1;
 405                                         }
 406                                 }
 407                                 if ($resetlocale) {
 408                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
 409                                         $res = $this->doQuery($SQL);
 410                                         if (!$res) {
 411                                                 print "<b>FAILED</b>. ";
 412                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"</li>\n";
 413                                                 dieout("</ul>");
 414                                         }
 415                                         print "OK</li>";
 416                                 }
 417
 418                                 // Final test: try out a simple tsearch2 query
 419                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 420                                 $res = $this->doQuery($SQL);
 421                                 if (!$res) {
 422                                         print "<b>FAILED</b>. Specifically, \"$SQL\" did not work.</li>";
 423                                         dieout("</ul>");
 424                                 }
 425                                 print "OK</li>";
 426                         }
 427
 428                         // Install plpgsql if needed
 429                         $this->setup_plpgsql();
 430
 431                         // Does the schema already exist? Who owns it?
 432                         $result = $this->schemaExists($wgDBmwschema);
 433                         if (!$result) {
 434                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 435                                 error_reporting( 0 );
 436                                 $safeschema = $this->quote_ident($wgDBmwschema);
 437                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 438                                 error_reporting( E_ALL );
 439                                 if (!$result) {
 440                                         print "<b>FAILED</b>. The user \"$wgDBuser\" must be able to access the schema. ".
 441                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 442                                                 "different user, and then grant access to the \"$wgDBuser\" user.</li>\n";
 443                                         dieout("</ul>");
 444                                 }
 445                                 print "OK</li>\n";
 446                         }
 447                         else if ($result != $wgDBuser) {
 448                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$wgDBuser\". Not ideal.</li>\n";
 449                         }
 450                         else {
 451                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$wgDBuser\". Excellent.</li>\n";
 452                         }
 453
 454                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 455                         print "<li>Setting the timezone to GMT for user \"$wgDBuser\" ...";
 456                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 457                         $result = pg_query($this->mConn, $SQL);
 458                         if (!$result) {
 459                                 print "<b>FAILED</b>.</li>\n";
 460                                 dieout("</ul>");
 461                         }
 462                         print "OK</li>\n";
 463                         // Set for the rest of this session
 464                         $SQL = "SET timezone = 'GMT'";
 465                         $result = pg_query($this->mConn, $SQL);
 466                         if (!$result) {
 467                                 print "<li>Failed to set timezone</li>\n";
 468                                 dieout("</ul>");
 469                         }
 470
 471                         print "<li>Setting the datestyle to ISO, YMD for user \"$wgDBuser\" ...";
 472                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 473                         $result = pg_query($this->mConn, $SQL);
 474                         if (!$result) {
 475                                 print "<b>FAILED</b>.</li>\n";
 476                                 dieout("</ul>");
 477                         }
 478                         print "OK</li>\n";
 479                         // Set for the rest of this session
 480                         $SQL = "SET datestyle = 'ISO, YMD'";
 481                         $result = pg_query($this->mConn, $SQL);
 482                         if (!$result) {
 483                                 print "<li>Failed to set datestyle</li>\n";
 484                                 dieout("</ul>");
 485                         }
 486
 487                         // Fix up the search paths if needed
 488                         print "<li>Setting the search path for user \"$wgDBuser\" ...";
 489                         $path = $this->quote_ident($wgDBmwschema);
 490                         if ($wgDBts2schema !== $wgDBmwschema)
 491                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 492                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 493                                 $path .= ", public";
 494                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 495                         $result = pg_query($this->mConn, $SQL);
 496                         if (!$result) {
 497                                 print "<b>FAILED</b>.</li>\n";
 498                                 dieout("</ul>");
 499                         }
 500                         print "OK</li>\n";
 501                         // Set for the rest of this session
 502                         $SQL = "SET search_path = $path";
 503                         $result = pg_query($this->mConn, $SQL);
 504                         if (!$result) {
 505                                 print "<li>Failed to set search_path</li>\n";
 506                                 dieout("</ul>");
 507                         }
 508                         define( "POSTGRES_SEARCHPATH", $path );
 509                 }
 510         }
 511
 512
 513         function setup_plpgsql() {
 514                 print "<li>Checking for Pl/Pgsql ...";
 515                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 516                 $rows = $this->numRows($this->doQuery($SQL));
 517                 if ($rows < 1) {
 518                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 519                         print "not installed. Attempting to install Pl/Pgsql ...";
 520                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 521                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 522                         $rows = $this->numRows($this->doQuery($SQL));
 523                         if ($rows >= 1) {
 524                         $olde = error_reporting(0);
 525                                 error_reporting($olde - E_WARNING);
 526                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 527                                 error_reporting($olde);
 528                                 if (!$result) {
 529                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 530                                         dieout("</ul>");
 531                                 }
 532                         }
 533                         else {
 534                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 535                                 dieout("</ul>");
 536                         }
 537                 }
 538                 print "OK</li>\n";
 539         }
 540
 541
 542         /**
 543          * Closes a database connection, if it is open
 544          * Returns success, true if already closed
 545          */
 546         function close() {
 547                 $this->mOpened = false;
 548                 if ( $this->mConn ) {
 549                         return pg_close( $this->mConn );
 550                 } else {
 551                         return true;
 552                 }
 553         }
 554
 555         function doQuery( $sql ) {
 556                 if (function_exists('mb_convert_encoding')) {
 557                         $sql = mb_convert_encoding($sql,'UTF-8');
 558                 }
 559                 $this->mLastResult = pg_query( $this->mConn, $sql);
 560                 $this->mAffectedRows = NULL; // use pg_affected_rows(mLastResult)
 561                 return $this->mLastResult;
 562         }
 563
 564         function queryIgnore( $sql, $fname = '' ) {
 565                 return $this->query( $sql, $fname, true );
 566         }
 567
 568         function freeResult( $res ) {
 569                 if ( $res instanceof ResultWrapper ) {
 570                         $res = $res->result;
 571                 }
 572                 if ( !@pg_free_result( $res ) ) {
 573                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 574                 }
 575         }
 576
 577         function fetchObject( $res ) {
 578                 if ( $res instanceof ResultWrapper ) {
 579                         $res = $res->result;
 580                 }
 581                 @$row = pg_fetch_object( $res );
 582                 # FIXME: HACK HACK HACK HACK debug
 583
 584                 # TODO:
 585                 # hashar : not sure if the following test really trigger if the object
 586                 #          fetching failed.
 587                 if( pg_last_error($this->mConn) ) {
 588                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 589                 }
 590                 return $row;
 591         }
 592
 593         function fetchRow( $res ) {
 594                 if ( $res instanceof ResultWrapper ) {
 595                         $res = $res->result;
 596                 }
 597                 @$row = pg_fetch_array( $res );
 598                 if( pg_last_error($this->mConn) ) {
 599                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 600                 }
 601                 return $row;
 602         }
 603
 604         function numRows( $res ) {
 605                 if ( $res instanceof ResultWrapper ) {
 606                         $res = $res->result;
 607                 }
 608                 @$n = pg_num_rows( $res );
 609                 if( pg_last_error($this->mConn) ) {
 610                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 611                 }
 612                 return $n;
 613         }
 614         function numFields( $res ) {
 615                 if ( $res instanceof ResultWrapper ) {
 616                         $res = $res->result;
 617                 }
 618                 return pg_num_fields( $res );
 619         }
 620         function fieldName( $res, $n ) {
 621                 if ( $res instanceof ResultWrapper ) {
 622                         $res = $res->result;
 623                 }
 624                 return pg_field_name( $res, $n );
 625         }
 626
 627         /**
 628          * This must be called after nextSequenceVal
 629          */
 630         function insertId() {
 631                 return $this->mInsertId;
 632         }
 633
 634         function dataSeek( $res, $row ) {
 635                 if ( $res instanceof ResultWrapper ) {
 636                         $res = $res->result;
 637                 }
 638                 return pg_result_seek( $res, $row );
 639         }
 640
 641         function lastError() {
 642                 if ( $this->mConn ) {
 643                         return pg_last_error();
 644                 }
 645                 else {
 646                         return "No database connection";
 647                 }
 648         }
 649         function lastErrno() {
 650                 return pg_last_error() ? 1 : 0;
 651         }
 652
 653         function affectedRows() {
 654                 if ( !is_null( $this->mAffectedRows ) ) {
 655                         // Forced result for simulated queries
 656                         return $this->mAffectedRows;
 657                 }
 658                 if( empty( $this->mLastResult ) )
 659                         return 0;
 660                 return pg_affected_rows( $this->mLastResult );
 661         }
 662
 663         /**
 664          * Estimate rows in dataset
 665          * Returns estimated count, based on EXPLAIN output
 666          * This is not necessarily an accurate estimate, so use sparingly
 667          * Returns -1 if count cannot be found
 668          * Takes same arguments as Database::select()
 669          */
 670
 671         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
 672                 $options['EXPLAIN'] = true;
 673                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 674                 $rows = -1;
 675                 if ( $res ) {
 676                         $row = $this->fetchRow( $res );
 677                         $count = array();
 678                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 679                                 $rows = $count[1];
 680                         }
 681                         $this->freeResult($res);
 682                 }
 683                 return $rows;
 684         }
 685
 686
 687         /**
 688          * Returns information about an index
 689          * If errors are explicitly ignored, returns NULL on failure
 690          */
 691         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 692                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 693                 $res = $this->query( $sql, $fname );
 694                 if ( !$res ) {
 695                         return NULL;
 696                 }
 697                 while ( $row = $this->fetchObject( $res ) ) {
 698                         if ( $row->indexname == $index ) {
 699                                 return $row;
 700                         }
 701                 }
 702                 return false;
 703         }
 704
 705         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 706                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 707                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 708                 $res = $this->query( $sql, $fname );
 709                 if ( !$res )
 710                         return NULL;
 711                 while ($row = $this->fetchObject( $res ))
 712                         return true;
 713                 return false;
 714
 715         }
 716
 717         /**
 718          * INSERT wrapper, inserts an array into a table
 719          *
 720          * $args may be a single associative array, or an array of these with numeric keys,
 721          * for multi-row insert (Postgres version 8.2 and above only).
 722          *
 723          * @param array $table   String: Name of the table to insert to.
 724          * @param array $args    Array: Items to insert into the table.
 725          * @param array $fname   String: Name of the function, for profiling
 726          * @param mixed $options String or Array. Valid options: IGNORE
 727          *
 728          * @return bool Success of insert operation. IGNORE always returns true.
 729          */
 730         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 731                 global $wgDBversion;
 732
 733                 if ( !count( $args ) ) {
 734                         return true;
 735                 }
 736
 737                 $table = $this->tableName( $table );
 738                 if (! isset( $wgDBversion ) ) {
 739                         $wgDBversion = $this->getServerVersion();
 740                 }
 741
 742                 if ( !is_array( $options ) )
 743                         $options = array( $options );
 744
 745                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 746                         $multi = true;
 747                         $keys = array_keys( $args[0] );
 748                 }
 749                 else {
 750                         $multi = false;
 751                         $keys = array_keys( $args );
 752                 }
 753
 754                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 755                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 756
 757                 // If we are not in a transaction, we need to be for savepoint trickery
 758                 $didbegin = 0;
 759                 if ( $ignore ) {
 760                         if (! $this->mTrxLevel) {
 761                                 $this->begin();
 762                                 $didbegin = 1;
 763                         }
 764                         $olde = error_reporting( 0 );
 765                         // For future use, we may want to track the number of actual inserts
 766                         // Right now, insert (all writes) simply return true/false
 767                         $numrowsinserted = 0;
 768                 }
 769
 770                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 771
 772                 if ( $multi ) {
 773                         if ( $wgDBversion >= 8.2 && !$ignore ) {
 774                                 $first = true;
 775                                 foreach ( $args as $row ) {
 776                                         if ( $first ) {
 777                                                 $first = false;
 778                                         } else {
 779                                                 $sql .= ',';
 780                                         }
 781                                         $sql .= '(' . $this->makeList( $row ) . ')';
 782                                 }
 783                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 784                         }
 785                         else {
 786                                 $res = true;
 787                                 $origsql = $sql;
 788                                 foreach ( $args as $row ) {
 789                                         $tempsql = $origsql;
 790                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 791
 792                                         if ( $ignore ) {
 793                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 794                                         }
 795
 796                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 797
 798                                         if ( $ignore ) {
 799                                                 $bar = pg_last_error();
 800                                                 if ($bar != false) {
 801                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 802                                                 }
 803                                                 else {
 804                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 805                                                         $numrowsinserted++;
 806                                                 }
 807                                         }
 808
 809                                         // If any of them fail, we fail overall for this function call
 810                                         // Note that this will be ignored if IGNORE is set
 811                                         if (! $tempres)
 812                                                 $res = false;
 813                                 }
 814                         }
 815                 }
 816                 else {
 817                         // Not multi, just a lone insert
 818                         if ( $ignore ) {
 819                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 820                         }
 821
 822                         $sql .= '(' . $this->makeList( $args ) . ')';
 823                         $res = (bool)$this->query( $sql, $fname, $ignore );
 824                         if ( $ignore ) {
 825                                 $bar = pg_last_error();
 826                                 if ($bar != false) {
 827                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 828                                 }
 829                                 else {
 830                                         pg_query( $this->mConn, "RELEASE $ignore" );
 831                                         $numrowsinserted++;
 832                                 }
 833                         }
 834                 }
 835                 if ( $ignore ) {
 836                         $olde = error_reporting( $olde );
 837                         if ($didbegin) {
 838                                 $this->commit();
 839                         }
 840
 841                         // Set the affected row count for the whole operation
 842                         $this->mAffectedRows = $numrowsinserted;
 843
 844                         // IGNORE always returns true
 845                         return true;
 846                 }
 847
 848
 849                 return $res;
 850
 851         }
 852
 853         function tableName( $name ) {
 854                 # Replace reserved words with better ones
 855                 switch( $name ) {
 856                         case 'user':
 857                                 return 'mwuser';
 858                         case 'text':
 859                                 return 'pagecontent';
 860                         default:
 861                                 return $name;
 862                 }
 863         }
 864
 865         /**
 866          * Return the next in a sequence, save the value for retrieval via insertId()
 867          */
 868         function nextSequenceValue( $seqName ) {
 869                 $safeseq = preg_replace( "/'/", "''", $seqName );
 870                 $res = $this->query( "SELECT nextval('$safeseq')" );
 871                 $row = $this->fetchRow( $res );
 872                 $this->mInsertId = $row[0];
 873                 $this->freeResult( $res );
 874                 return $this->mInsertId;
 875         }
 876
 877         /**
 878          * Return the current value of a sequence. Assumes it has ben nextval'ed in this session.
 879          */
 880         function currentSequenceValue( $seqName ) {
 881                 $safeseq = preg_replace( "/'/", "''", $seqName );
 882                 $res = $this->query( "SELECT currval('$safeseq')" );
 883                 $row = $this->fetchRow( $res );
 884                 $currval = $row[0];
 885                 $this->freeResult( $res );
 886                 return $currval;
 887         }
 888
 889         /**
 890          * Postgres does not have a "USE INDEX" clause, so return an empty string
 891          */
 892         function useIndexClause( $index ) {
 893                 return '';
 894         }
 895
 896         # REPLACE query wrapper
 897         # Postgres simulates this with a DELETE followed by INSERT
 898         # $row is the row to insert, an associative array
 899         # $uniqueIndexes is an array of indexes. Each element may be either a
 900         # field name or an array of field names
 901         #
 902         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 903         # However if you do this, you run the risk of encountering errors which wouldn't have
 904         # occurred in MySQL
 905         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 906                 $table = $this->tableName( $table );
 907
 908                 if (count($rows)==0) {
 909                         return;
 910                 }
 911
 912                 # Single row case
 913                 if ( !is_array( reset( $rows ) ) ) {
 914                         $rows = array( $rows );
 915                 }
 916
 917                 foreach( $rows as $row ) {
 918                         # Delete rows which collide
 919                         if ( $uniqueIndexes ) {
 920                                 $sql = "DELETE FROM $table WHERE ";
 921                                 $first = true;
 922                                 foreach ( $uniqueIndexes as $index ) {
 923                                         if ( $first ) {
 924                                                 $first = false;
 925                                                 $sql .= "(";
 926                                         } else {
 927                                                 $sql .= ') OR (';
 928                                         }
 929                                         if ( is_array( $index ) ) {
 930                                                 $first2 = true;
 931                                                 foreach ( $index as $col ) {
 932                                                         if ( $first2 ) {
 933                                                                 $first2 = false;
 934                                                         } else {
 935                                                                 $sql .= ' AND ';
 936                                                         }
 937                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 938                                                 }
 939                                         } else {
 940                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 941                                         }
 942                                 }
 943                                 $sql .= ')';
 944                                 $this->query( $sql, $fname );
 945                         }
 946
 947                         # Now insert the row
 948                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 949                                 $this->makeList( $row, LIST_COMMA ) . ')';
 950                         $this->query( $sql, $fname );
 951                 }
 952         }
 953
 954         # DELETE where the condition is a join
 955         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 956                 if ( !$conds ) {
 957                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 958                 }
 959
 960                 $delTable = $this->tableName( $delTable );
 961                 $joinTable = $this->tableName( $joinTable );
 962                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 963                 if ( $conds != '*' ) {
 964                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 965                 }
 966                 $sql .= ')';
 967
 968                 $this->query( $sql, $fname );
 969         }
 970
 971         # Returns the size of a text field, or -1 for "unlimited"
 972         function textFieldSize( $table, $field ) {
 973                 $table = $this->tableName( $table );
 974                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 975                         FROM pg_class c, pg_attribute a, pg_type t
 976                         WHERE relname='$table' AND a.attrelid=c.oid AND
 977                                 a.atttypid=t.oid and a.attname='$field'";
 978                 $res =$this->query($sql);
 979                 $row=$this->fetchObject($res);
 980                 if ($row->ftype=="varchar") {
 981                         $size=$row->size-4;
 982                 } else {
 983                         $size=$row->size;
 984                 }
 985                 $this->freeResult( $res );
 986                 return $size;
 987         }
 988
 989         function lowPriorityOption() {
 990                 return '';
 991         }
 992
 993         function limitResult($sql, $limit, $offset=false) {
 994                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 995         }
 996
 997         /**
 998          * Returns an SQL expression for a simple conditional.
 999          * Uses CASE on Postgres
1000          *
1001          * @param string $cond SQL expression which will result in a boolean value
1002          * @param string $trueVal SQL expression to return if true
1003          * @param string $falseVal SQL expression to return if false
1004          * @return string SQL fragment
1005          */
1006         function conditional( $cond, $trueVal, $falseVal ) {
1007                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
1008         }
1009
1010         function wasDeadlock() {
1011                 return $this->lastErrno() == '40P01';
1012         }
1013
1014         function timestamp( $ts=0 ) {
1015                 return wfTimestamp(TS_POSTGRES,$ts);
1016         }
1017
1018         /**
1019          * Return aggregated value function call
1020          */
1021         function aggregateValue ($valuedata,$valuename='value') {
1022                 return $valuedata;
1023         }
1024
1025
1026         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1027                 // Ignore errors during error handling to avoid infinite recursion
1028                 $ignore = $this->ignoreErrors( true );
1029                 $this->mErrorCount++;
1030
1031                 if ($ignore || $tempIgnore) {
1032                         wfDebug("SQL ERROR (ignored): $error\n");
1033                         $this->ignoreErrors( $ignore );
1034                 }
1035                 else {
1036                         $message = "A database error has occurred\n" .
1037                                 "Query: $sql\n" .
1038                                 "Function: $fname\n" .
1039                                 "Error: $errno $error\n";
1040                         throw new DBUnexpectedError($this, $message);
1041                 }
1042         }
1043
1044         /**
1045          * @return string wikitext of a link to the server software's web site
1046          */
1047         function getSoftwareLink() {
1048                 return "[http://www.postgresql.org/ PostgreSQL]";
1049         }
1050
1051         /**
1052          * @return string Version information from the database
1053          */
1054         function getServerVersion() {
1055                 $versionInfo = pg_version( $this->mConn );
1056                 return $versionInfo['server'];
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