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 $wgDBport;
 134
 135                 if (!strlen($user)) { ## e.g. the class is being loaded
 136                         return;
 137                 }
 138                 $this->close();
 139                 $this->mServer = $server;
 140                 $this->mPort = $port = $wgDBport;
 141                 $this->mUser = $user;
 142                 $this->mPassword = $password;
 143                 $this->mDBname = $dbName;
 144
 145                 $connectVars = array(
 146                         'dbname' => $dbName,
 147                         'user' => $user,
 148                         'password' => $password );
 149                 if ($server!=false && $server!="") {
 150                         $connectVars['host'] = $server;
 151                 }
 152                 if ($port!=false && $port!="") {
 153                         $connectVars['port'] = $port;
 154                 }
 155                 $connectString = $this->makeConnectionString( $connectVars );
 156
 157                 $this->installErrorHandler();
 158                 $this->mConn = pg_connect( $connectString );
 159                 $phpError = $this->restoreErrorHandler();
 160
 161                 if ( $this->mConn == false ) {
 162                         wfDebug( "DB connection error\n" );
 163                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 164                         wfDebug( $this->lastError()."\n" );
 165                         if ( !$this->mFailFunction ) {
 166                                 throw new DBConnectionError( $this, $phpError );
 167                         } else {
 168                                 return false;
 169                         }
 170                 }
 171
 172                 $this->mOpened = true;
 173
 174                 global $wgCommandLineMode;
 175                 ## If called from the command-line (e.g. importDump), only show errors
 176                 if ($wgCommandLineMode) {
 177                         $this->doQuery("SET client_min_messages = 'ERROR'");
 178                 }
 179
 180                 global $wgDBmwschema, $wgDBts2schema;
 181                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 182                         && $wgDBmwschema !== 'mediawiki'
 183                         && preg_match( '/^\w+$/', $wgDBmwschema )
 184                         && preg_match( '/^\w+$/', $wgDBts2schema )
 185                 ) {
 186                         $safeschema = $this->quote_ident($wgDBmwschema);
 187                         $safeschema2 = $this->quote_ident($wgDBts2schema);
 188                         $this->doQuery("SET search_path = $safeschema, $wgDBts2schema, public");
 189                 }
 190
 191                 return $this->mConn;
 192         }
 193
 194         function makeConnectionString( $vars ) {
 195                 $s = '';
 196                 foreach ( $vars as $name => $value ) {
 197                         $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
 198                 }
 199                 return $s;
 200         }
 201
 202
 203         function initial_setup($password, $dbName) {
 204                 // If this is the initial connection, setup the schema stuff and possibly create the user
 205                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema, $wgDBts2schema;
 206
 207                 print "<li>Checking the version of Postgres...";
 208                 $version = $this->getServerVersion();
 209                 $PGMINVER = '8.1';
 210                 if ($version < $PGMINVER) {
 211                         print "<b>FAILED</b>. Required version is $PGMINVER. You have $version</li>\n";
 212                         dieout("</ul>");
 213                 }
 214                 print "version $this->numeric_version is OK.</li>\n";
 215
 216                 $safeuser = $this->quote_ident($wgDBuser);
 217                 // Are we connecting as a superuser for the first time?
 218                 if ($wgDBsuperuser) {
 219                         // Are we really a superuser? Check out our rights
 220                         $SQL = "SELECT
 221                       CASE WHEN usesuper IS TRUE THEN
 222                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 223                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 224                     END AS rights
 225                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 226                         $rows = $this->numRows($res = $this->doQuery($SQL));
 227                         if (!$rows) {
 228                                 print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 229                                 dieout('</ul>');
 230                         }
 231                         $perms = pg_fetch_result($res, 0, 0);
 232
 233                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 234                         $rows = $this->numRows($this->doQuery($SQL));
 235                         if ($rows) {
 236                                 print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 237                         }
 238                         else {
 239                                 if ($perms != 1 and $perms != 3) {
 240                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 241                                         print 'Please use a different Postgres user.</li>';
 242                                         dieout('</ul>');
 243                                 }
 244                                 print "<li>Creating user <b>$wgDBuser</b>...";
 245                                 $safepass = $this->addQuotes($wgDBpassword);
 246                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 247                                 $this->doQuery($SQL);
 248                                 print "OK</li>\n";
 249                         }
 250                         // User now exists, check out the database
 251                         if ($dbName != $wgDBname) {
 252                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 253                                 $rows = $this->numRows($this->doQuery($SQL));
 254                                 if ($rows) {
 255                                         print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 256                                 }
 257                                 else {
 258                                         if ($perms < 2) {
 259                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 260                                                 print 'Please use a different Postgres user.</li>';
 261                                                 dieout('</ul>');
 262                                         }
 263                                         print "<li>Creating database <b>$wgDBname</b>...";
 264                                         $safename = $this->quote_ident($wgDBname);
 265                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 266                                         $this->doQuery($SQL);
 267                                         print "OK</li>\n";
 268                                         // Hopefully tsearch2 and plpgsql are in template1...
 269                                 }
 270
 271                                 // Reconnect to check out tsearch2 rights for this user
 272                                 print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 273
 274                                 $hstring="";
 275                                 if ($this->mServer!=false && $this->mServer!="") {
 276                                         $hstring="host=$this->mServer ";
 277                                 }
 278                                 if ($this->mPort!=false && $this->mPort!="") {
 279                                         $hstring .= "port=$this->mPort ";
 280                                 }
 281
 282                                 @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$wgDBsuperuser password=$password");
 283                                 if ( $this->mConn == false ) {
 284                                         print "<b>FAILED TO CONNECT!</b></li>";
 285                                         dieout("</ul>");
 286                                 }
 287                                 print "OK</li>\n";
 288                         }
 289
 290                         if ($this->numeric_version < 8.3) {
 291                                 // Tsearch2 checks
 292                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 293                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 294                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 295                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 296                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 297                                         dieout("</ul>");
 298                                 }
 299                                 print "OK</li>\n";
 300                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 301                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 302                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 303                                         $this->doQuery($SQL);
 304                                 }
 305                                 print "OK</li>\n";
 306                         }
 307
 308                         // Setup the schema for this user if needed
 309                         $result = $this->schemaExists($wgDBmwschema);
 310                         $safeschema = $this->quote_ident($wgDBmwschema);
 311                         if (!$result) {
 312                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 313                                 $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 314                                 if (!$result) {
 315                                         print "<b>FAILED</b>.</li>\n";
 316                                         dieout("</ul>");
 317                                 }
 318                                 print "OK</li>\n";
 319                         }
 320                         else {
 321                                 print "<li>Schema already exists, explicitly granting rights...\n";
 322                                 $safeschema2 = $this->addQuotes($wgDBmwschema);
 323                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 324                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 325                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 326                                         "AND p.relkind IN ('r','S','v')\n";
 327                                 $SQL .= "UNION\n";
 328                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 329                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 330                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 331                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 332                                 $res = $this->doQuery($SQL);
 333                                 if (!$res) {
 334                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 335                                         dieout("</ul>");
 336                                 }
 337                                 $this->doQuery("SET search_path = $safeschema");
 338                                 $rows = $this->numRows($res);
 339                                 while ($rows) {
 340                                         $rows--;
 341                                         $this->doQuery(pg_fetch_result($res, $rows, 0));
 342                                 }
 343                                 print "OK</li>";
 344                         }
 345
 346                         // Install plpgsql if needed
 347                         $this->setup_plpgsql();
 348
 349                         $wgDBsuperuser = '';
 350                         return true; // Reconnect as regular user
 351
 352                 } // end superuser
 353
 354                 if (!defined('POSTGRES_SEARCHPATH')) {
 355
 356                         if ($this->numeric_version < 8.3) {
 357                                 // Do we have the basic tsearch2 table?
 358                                 print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 359                                 if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 360                                         print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 361                                         print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 362                                         print " for instructions.</li>\n";
 363                                         dieout("</ul>");
 364                                 }
 365                                 print "OK</li>\n";
 366
 367                                 // Does this user have the rights to the tsearch2 tables?
 368                                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 369                                 print "<li>Checking tsearch2 permissions...";
 370                                 // Let's check all four, just to be safe
 371                                 error_reporting( 0 );
 372                                 $ts2tables = array('cfg','cfgmap','dict','parser');
 373                                 $safetsschema = $this->quote_ident($wgDBts2schema);
 374                                 foreach ( $ts2tables AS $tname ) {
 375                                         $SQL = "SELECT count(*) FROM $safetsschema.pg_ts_$tname";
 376                                         $res = $this->doQuery($SQL);
 377                                         if (!$res) {
 378                                                 print "<b>FAILED</b> to access pg_ts_$tname. Make sure that the user ".
 379                                                         "\"$wgDBuser\" has SELECT access to all four tsearch2 tables</li>\n";
 380                                                 dieout("</ul>");
 381                                         }
 382                                 }
 383                                 $SQL = "SELECT ts_name FROM $safetsschema.pg_ts_cfg WHERE locale = '$ctype'";
 384                                 $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 385                                 $res = $this->doQuery($SQL);
 386                                 error_reporting( E_ALL );
 387                                 if (!$res) {
 388                                         print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 389                                         dieout("</ul>");
 390                                 }
 391                                 print "OK</li>";
 392
 393                                 // Will the current locale work? Can we force it to?
 394                                 print "<li>Verifying tsearch2 locale with $ctype...";
 395                                 $rows = $this->numRows($res);
 396                                 $resetlocale = 0;
 397                                 if (!$rows) {
 398                                         print "<b>not found</b></li>\n";
 399                                         print "<li>Attempting to set default tsearch2 locale to \"$ctype\"...";
 400                                         $resetlocale = 1;
 401                                 }
 402                                 else {
 403                                         $tsname = pg_fetch_result($res, 0, 0);
 404                                         if ($tsname != 'default') {
 405                                                 print "<b>not set to default ($tsname)</b>";
 406                                                 print "<li>Attempting to change tsearch2 default locale to \"$ctype\"...";
 407                                                 $resetlocale = 1;
 408                                         }
 409                                 }
 410                                 if ($resetlocale) {
 411                                         $SQL = "UPDATE $safetsschema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
 412                                         $res = $this->doQuery($SQL);
 413                                         if (!$res) {
 414                                                 print "<b>FAILED</b>. ";
 415                                                 print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"</li>\n";
 416                                                 dieout("</ul>");
 417                                         }
 418                                         print "OK</li>";
 419                                 }
 420
 421                                 // Final test: try out a simple tsearch2 query
 422                                 $SQL = "SELECT $safetsschema.to_tsvector('default','MediaWiki tsearch2 testing')";
 423                                 $res = $this->doQuery($SQL);
 424                                 if (!$res) {
 425                                         print "<b>FAILED</b>. Specifically, \"$SQL\" did not work.</li>";
 426                                         dieout("</ul>");
 427                                 }
 428                                 print "OK</li>";
 429                         }
 430
 431                         // Install plpgsql if needed
 432                         $this->setup_plpgsql();
 433
 434                         // Does the schema already exist? Who owns it?
 435                         $result = $this->schemaExists($wgDBmwschema);
 436                         if (!$result) {
 437                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 438                                 error_reporting( 0 );
 439                                 $safeschema = $this->quote_ident($wgDBmwschema);
 440                                 $result = $this->doQuery("CREATE SCHEMA $safeschema");
 441                                 error_reporting( E_ALL );
 442                                 if (!$result) {
 443                                         print "<b>FAILED</b>. The user \"$wgDBuser\" must be able to access the schema. ".
 444                                                 "You can try making them the owner of the database, or try creating the schema with a ".
 445                                                 "different user, and then grant access to the \"$wgDBuser\" user.</li>\n";
 446                                         dieout("</ul>");
 447                                 }
 448                                 print "OK</li>\n";
 449                         }
 450                         else if ($result != $wgDBuser) {
 451                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$wgDBuser\". Not ideal.</li>\n";
 452                         }
 453                         else {
 454                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$wgDBuser\". Excellent.</li>\n";
 455                         }
 456
 457                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 458                         print "<li>Setting the timezone to GMT for user \"$wgDBuser\" ...";
 459                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 460                         $result = pg_query($this->mConn, $SQL);
 461                         if (!$result) {
 462                                 print "<b>FAILED</b>.</li>\n";
 463                                 dieout("</ul>");
 464                         }
 465                         print "OK</li>\n";
 466                         // Set for the rest of this session
 467                         $SQL = "SET timezone = 'GMT'";
 468                         $result = pg_query($this->mConn, $SQL);
 469                         if (!$result) {
 470                                 print "<li>Failed to set timezone</li>\n";
 471                                 dieout("</ul>");
 472                         }
 473
 474                         print "<li>Setting the datestyle to ISO, YMD for user \"$wgDBuser\" ...";
 475                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 476                         $result = pg_query($this->mConn, $SQL);
 477                         if (!$result) {
 478                                 print "<b>FAILED</b>.</li>\n";
 479                                 dieout("</ul>");
 480                         }
 481                         print "OK</li>\n";
 482                         // Set for the rest of this session
 483                         $SQL = "SET datestyle = 'ISO, YMD'";
 484                         $result = pg_query($this->mConn, $SQL);
 485                         if (!$result) {
 486                                 print "<li>Failed to set datestyle</li>\n";
 487                                 dieout("</ul>");
 488                         }
 489
 490                         // Fix up the search paths if needed
 491                         print "<li>Setting the search path for user \"$wgDBuser\" ...";
 492                         $path = $this->quote_ident($wgDBmwschema);
 493                         if ($wgDBts2schema !== $wgDBmwschema)
 494                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 495                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 496                                 $path .= ", public";
 497                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 498                         $result = pg_query($this->mConn, $SQL);
 499                         if (!$result) {
 500                                 print "<b>FAILED</b>.</li>\n";
 501                                 dieout("</ul>");
 502                         }
 503                         print "OK</li>\n";
 504                         // Set for the rest of this session
 505                         $SQL = "SET search_path = $path";
 506                         $result = pg_query($this->mConn, $SQL);
 507                         if (!$result) {
 508                                 print "<li>Failed to set search_path</li>\n";
 509                                 dieout("</ul>");
 510                         }
 511                         define( "POSTGRES_SEARCHPATH", $path );
 512                 }
 513         }
 514
 515
 516         function setup_plpgsql() {
 517                 print "<li>Checking for Pl/Pgsql ...";
 518                 $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 519                 $rows = $this->numRows($this->doQuery($SQL));
 520                 if ($rows < 1) {
 521                         // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 522                         print "not installed. Attempting to install Pl/Pgsql ...";
 523                         $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 524                                 "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 525                         $rows = $this->numRows($this->doQuery($SQL));
 526                         if ($rows >= 1) {
 527                         $olde = error_reporting(0);
 528                                 error_reporting($olde - E_WARNING);
 529                                 $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 530                                 error_reporting($olde);
 531                                 if (!$result) {
 532                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 533                                         dieout("</ul>");
 534                                 }
 535                         }
 536                         else {
 537                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 538                                 dieout("</ul>");
 539                         }
 540                 }
 541                 print "OK</li>\n";
 542         }
 543
 544
 545         /**
 546          * Closes a database connection, if it is open
 547          * Returns success, true if already closed
 548          */
 549         function close() {
 550                 $this->mOpened = false;
 551                 if ( $this->mConn ) {
 552                         return pg_close( $this->mConn );
 553                 } else {
 554                         return true;
 555                 }
 556         }
 557
 558         function doQuery( $sql ) {
 559                 if (function_exists('mb_convert_encoding')) {
 560                         $sql = mb_convert_encoding($sql,'UTF-8');
 561                 }
 562                 $this->mLastResult = pg_query( $this->mConn, $sql);
 563                 $this->mAffectedRows = NULL; // use pg_affected_rows(mLastResult)
 564                 return $this->mLastResult;
 565         }
 566
 567         function queryIgnore( $sql, $fname = '' ) {
 568                 return $this->query( $sql, $fname, true );
 569         }
 570
 571         function freeResult( $res ) {
 572                 if ( $res instanceof ResultWrapper ) {
 573                         $res = $res->result;
 574                 }
 575                 if ( !@pg_free_result( $res ) ) {
 576                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 577                 }
 578         }
 579
 580         function fetchObject( $res ) {
 581                 if ( $res instanceof ResultWrapper ) {
 582                         $res = $res->result;
 583                 }
 584                 @$row = pg_fetch_object( $res );
 585                 # FIXME: HACK HACK HACK HACK debug
 586
 587                 # TODO:
 588                 # hashar : not sure if the following test really trigger if the object
 589                 #          fetching failed.
 590                 if( pg_last_error($this->mConn) ) {
 591                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 592                 }
 593                 return $row;
 594         }
 595
 596         function fetchRow( $res ) {
 597                 if ( $res instanceof ResultWrapper ) {
 598                         $res = $res->result;
 599                 }
 600                 @$row = pg_fetch_array( $res );
 601                 if( pg_last_error($this->mConn) ) {
 602                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 603                 }
 604                 return $row;
 605         }
 606
 607         function numRows( $res ) {
 608                 if ( $res instanceof ResultWrapper ) {
 609                         $res = $res->result;
 610                 }
 611                 @$n = pg_num_rows( $res );
 612                 if( pg_last_error($this->mConn) ) {
 613                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 614                 }
 615                 return $n;
 616         }
 617         function numFields( $res ) {
 618                 if ( $res instanceof ResultWrapper ) {
 619                         $res = $res->result;
 620                 }
 621                 return pg_num_fields( $res );
 622         }
 623         function fieldName( $res, $n ) {
 624                 if ( $res instanceof ResultWrapper ) {
 625                         $res = $res->result;
 626                 }
 627                 return pg_field_name( $res, $n );
 628         }
 629
 630         /**
 631          * This must be called after nextSequenceVal
 632          */
 633         function insertId() {
 634                 return $this->mInsertId;
 635         }
 636
 637         function dataSeek( $res, $row ) {
 638                 if ( $res instanceof ResultWrapper ) {
 639                         $res = $res->result;
 640                 }
 641                 return pg_result_seek( $res, $row );
 642         }
 643
 644         function lastError() {
 645                 if ( $this->mConn ) {
 646                         return pg_last_error();
 647                 }
 648                 else {
 649                         return "No database connection";
 650                 }
 651         }
 652         function lastErrno() {
 653                 return pg_last_error() ? 1 : 0;
 654         }
 655
 656         function affectedRows() {
 657                 if ( !is_null( $this->mAffectedRows ) ) {
 658                         // Forced result for simulated queries
 659                         return $this->mAffectedRows;
 660                 }
 661                 if( empty( $this->mLastResult ) )
 662                         return 0;
 663                 return pg_affected_rows( $this->mLastResult );
 664         }
 665
 666         /**
 667          * Estimate rows in dataset
 668          * Returns estimated count, based on EXPLAIN output
 669          * This is not necessarily an accurate estimate, so use sparingly
 670          * Returns -1 if count cannot be found
 671          * Takes same arguments as Database::select()
 672          */
 673
 674         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
 675                 $options['EXPLAIN'] = true;
 676                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 677                 $rows = -1;
 678                 if ( $res ) {
 679                         $row = $this->fetchRow( $res );
 680                         $count = array();
 681                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 682                                 $rows = $count[1];
 683                         }
 684                         $this->freeResult($res);
 685                 }
 686                 return $rows;
 687         }
 688
 689
 690         /**
 691          * Returns information about an index
 692          * If errors are explicitly ignored, returns NULL on failure
 693          */
 694         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 695                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 696                 $res = $this->query( $sql, $fname );
 697                 if ( !$res ) {
 698                         return NULL;
 699                 }
 700                 while ( $row = $this->fetchObject( $res ) ) {
 701                         if ( $row->indexname == $index ) {
 702                                 return $row;
 703                         }
 704                 }
 705                 return false;
 706         }
 707
 708         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 709                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 710                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 711                 $res = $this->query( $sql, $fname );
 712                 if ( !$res )
 713                         return NULL;
 714                 while ($row = $this->fetchObject( $res ))
 715                         return true;
 716                 return false;
 717
 718         }
 719
 720         /**
 721          * INSERT wrapper, inserts an array into a table
 722          *
 723          * $args may be a single associative array, or an array of these with numeric keys,
 724          * for multi-row insert (Postgres version 8.2 and above only).
 725          *
 726          * @param $table   String: Name of the table to insert to.
 727          * @param $args    Array: Items to insert into the table.
 728          * @param $fname   String: Name of the function, for profiling
 729          * @param $options String or Array. Valid options: IGNORE
 730          *
 731          * @return bool Success of insert operation. IGNORE always returns true.
 732          */
 733         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 734                 global $wgDBversion;
 735
 736                 if ( !count( $args ) ) {
 737                         return true;
 738                 }
 739
 740                 $table = $this->tableName( $table );
 741                 if (! isset( $wgDBversion ) ) {
 742                         $wgDBversion = $this->getServerVersion();
 743                 }
 744
 745                 if ( !is_array( $options ) )
 746                         $options = array( $options );
 747
 748                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 749                         $multi = true;
 750                         $keys = array_keys( $args[0] );
 751                 }
 752                 else {
 753                         $multi = false;
 754                         $keys = array_keys( $args );
 755                 }
 756
 757                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 758                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 759
 760                 // If we are not in a transaction, we need to be for savepoint trickery
 761                 $didbegin = 0;
 762                 if ( $ignore ) {
 763                         if (! $this->mTrxLevel) {
 764                                 $this->begin();
 765                                 $didbegin = 1;
 766                         }
 767                         $olde = error_reporting( 0 );
 768                         // For future use, we may want to track the number of actual inserts
 769                         // Right now, insert (all writes) simply return true/false
 770                         $numrowsinserted = 0;
 771                 }
 772
 773                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 774
 775                 if ( $multi ) {
 776                         if ( $wgDBversion >= 8.2 && !$ignore ) {
 777                                 $first = true;
 778                                 foreach ( $args as $row ) {
 779                                         if ( $first ) {
 780                                                 $first = false;
 781                                         } else {
 782                                                 $sql .= ',';
 783                                         }
 784                                         $sql .= '(' . $this->makeList( $row ) . ')';
 785                                 }
 786                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 787                         }
 788                         else {
 789                                 $res = true;
 790                                 $origsql = $sql;
 791                                 foreach ( $args as $row ) {
 792                                         $tempsql = $origsql;
 793                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 794
 795                                         if ( $ignore ) {
 796                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 797                                         }
 798
 799                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 800
 801                                         if ( $ignore ) {
 802                                                 $bar = pg_last_error();
 803                                                 if ($bar != false) {
 804                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 805                                                 }
 806                                                 else {
 807                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 808                                                         $numrowsinserted++;
 809                                                 }
 810                                         }
 811
 812                                         // If any of them fail, we fail overall for this function call
 813                                         // Note that this will be ignored if IGNORE is set
 814                                         if (! $tempres)
 815                                                 $res = false;
 816                                 }
 817                         }
 818                 }
 819                 else {
 820                         // Not multi, just a lone insert
 821                         if ( $ignore ) {
 822                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 823                         }
 824
 825                         $sql .= '(' . $this->makeList( $args ) . ')';
 826                         $res = (bool)$this->query( $sql, $fname, $ignore );
 827                         if ( $ignore ) {
 828                                 $bar = pg_last_error();
 829                                 if ($bar != false) {
 830                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 831                                 }
 832                                 else {
 833                                         pg_query( $this->mConn, "RELEASE $ignore" );
 834                                         $numrowsinserted++;
 835                                 }
 836                         }
 837                 }
 838                 if ( $ignore ) {
 839                         $olde = error_reporting( $olde );
 840                         if ($didbegin) {
 841                                 $this->commit();
 842                         }
 843
 844                         // Set the affected row count for the whole operation
 845                         $this->mAffectedRows = $numrowsinserted;
 846
 847                         // IGNORE always returns true
 848                         return true;
 849                 }
 850
 851
 852                 return $res;
 853
 854         }
 855
 856         function tableName( $name ) {
 857                 # Replace reserved words with better ones
 858                 switch( $name ) {
 859                         case 'user':
 860                                 return 'mwuser';
 861                         case 'text':
 862                                 return 'pagecontent';
 863                         default:
 864                                 return $name;
 865                 }
 866         }
 867
 868         /**
 869          * Return the next in a sequence, save the value for retrieval via insertId()
 870          */
 871         function nextSequenceValue( $seqName ) {
 872                 $safeseq = preg_replace( "/'/", "''", $seqName );
 873                 $res = $this->query( "SELECT nextval('$safeseq')" );
 874                 $row = $this->fetchRow( $res );
 875                 $this->mInsertId = $row[0];
 876                 $this->freeResult( $res );
 877                 return $this->mInsertId;
 878         }
 879
 880         /**
 881          * Return the current value of a sequence. Assumes it has ben nextval'ed in this session.
 882          */
 883         function currentSequenceValue( $seqName ) {
 884                 $safeseq = preg_replace( "/'/", "''", $seqName );
 885                 $res = $this->query( "SELECT currval('$safeseq')" );
 886                 $row = $this->fetchRow( $res );
 887                 $currval = $row[0];
 888                 $this->freeResult( $res );
 889                 return $currval;
 890         }
 891
 892         /**
 893          * Postgres does not have a "USE INDEX" clause, so return an empty string
 894          */
 895         function useIndexClause( $index ) {
 896                 return '';
 897         }
 898
 899         # REPLACE query wrapper
 900         # Postgres simulates this with a DELETE followed by INSERT
 901         # $row is the row to insert, an associative array
 902         # $uniqueIndexes is an array of indexes. Each element may be either a
 903         # field name or an array of field names
 904         #
 905         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 906         # However if you do this, you run the risk of encountering errors which wouldn't have
 907         # occurred in MySQL
 908         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 909                 $table = $this->tableName( $table );
 910
 911                 if (count($rows)==0) {
 912                         return;
 913                 }
 914
 915                 # Single row case
 916                 if ( !is_array( reset( $rows ) ) ) {
 917                         $rows = array( $rows );
 918                 }
 919
 920                 foreach( $rows as $row ) {
 921                         # Delete rows which collide
 922                         if ( $uniqueIndexes ) {
 923                                 $sql = "DELETE FROM $table WHERE ";
 924                                 $first = true;
 925                                 foreach ( $uniqueIndexes as $index ) {
 926                                         if ( $first ) {
 927                                                 $first = false;
 928                                                 $sql .= "(";
 929                                         } else {
 930                                                 $sql .= ') OR (';
 931                                         }
 932                                         if ( is_array( $index ) ) {
 933                                                 $first2 = true;
 934                                                 foreach ( $index as $col ) {
 935                                                         if ( $first2 ) {
 936                                                                 $first2 = false;
 937                                                         } else {
 938                                                                 $sql .= ' AND ';
 939                                                         }
 940                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 941                                                 }
 942                                         } else {
 943                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 944                                         }
 945                                 }
 946                                 $sql .= ')';
 947                                 $this->query( $sql, $fname );
 948                         }
 949
 950                         # Now insert the row
 951                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 952                                 $this->makeList( $row, LIST_COMMA ) . ')';
 953                         $this->query( $sql, $fname );
 954                 }
 955         }
 956
 957         # DELETE where the condition is a join
 958         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 959                 if ( !$conds ) {
 960                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 961                 }
 962
 963                 $delTable = $this->tableName( $delTable );
 964                 $joinTable = $this->tableName( $joinTable );
 965                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 966                 if ( $conds != '*' ) {
 967                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 968                 }
 969                 $sql .= ')';
 970
 971                 $this->query( $sql, $fname );
 972         }
 973
 974         # Returns the size of a text field, or -1 for "unlimited"
 975         function textFieldSize( $table, $field ) {
 976                 $table = $this->tableName( $table );
 977                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 978                         FROM pg_class c, pg_attribute a, pg_type t
 979                         WHERE relname='$table' AND a.attrelid=c.oid AND
 980                                 a.atttypid=t.oid and a.attname='$field'";
 981                 $res =$this->query($sql);
 982                 $row=$this->fetchObject($res);
 983                 if ($row->ftype=="varchar") {
 984                         $size=$row->size-4;
 985                 } else {
 986                         $size=$row->size;
 987                 }
 988                 $this->freeResult( $res );
 989                 return $size;
 990         }
 991
 992         function lowPriorityOption() {
 993                 return '';
 994         }
 995
 996         function limitResult($sql, $limit, $offset=false) {
 997                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 998         }
 999
1000         /**
1001          * Returns an SQL expression for a simple conditional.
1002          * Uses CASE on Postgres
1003          *
1004          * @param $cond String: SQL expression which will result in a boolean value
1005          * @param $trueVal String: SQL expression to return if true
1006          * @param $falseVal String: SQL expression to return if false
1007          * @return String: SQL fragment
1008          */
1009         function conditional( $cond, $trueVal, $falseVal ) {
1010                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
1011         }
1012
1013         function wasDeadlock() {
1014                 return $this->lastErrno() == '40P01';
1015         }
1016
1017         function timestamp( $ts=0 ) {
1018                 return wfTimestamp(TS_POSTGRES,$ts);
1019         }
1020
1021         /**
1022          * Return aggregated value function call
1023          */
1024         function aggregateValue ($valuedata,$valuename='value') {
1025                 return $valuedata;
1026         }
1027
1028
1029         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1030                 // Ignore errors during error handling to avoid infinite recursion
1031                 $ignore = $this->ignoreErrors( true );
1032                 $this->mErrorCount++;
1033
1034                 if ($ignore || $tempIgnore) {
1035                         wfDebug("SQL ERROR (ignored): $error\n");
1036                         $this->ignoreErrors( $ignore );
1037                 }
1038                 else {
1039                         $message = "A database error has occurred\n" .
1040                                 "Query: $sql\n" .
1041                                 "Function: $fname\n" .
1042                                 "Error: $errno $error\n";
1043                         throw new DBUnexpectedError($this, $message);
1044                 }
1045         }
1046
1047         /**
1048          * @return string wikitext of a link to the server software's web site
1049          */
1050         function getSoftwareLink() {
1051                 return "[http://www.postgresql.org/ PostgreSQL]";
1052         }
1053
1054         /**
1055          * @return string Version information from the database
1056          */
1057         function getServerVersion() {
1058                 $versionInfo = pg_version( $this->mConn );
1059                 if ( isset( $versionInfo['server'] ) ) {
1060                         $this->numeric_version = $versionInfo['server'];
1061                 } else {
1062                         // There's no way to identify the precise version before 7.4, but
1063                         // it doesn't matter anyway since we're just going to give an error.
1064                         $this->numeric_version = '7.3 or earlier';
1065                 }
1066                 return $this->numeric_version;
1067         }
1068
1069         /**
1070          * Query whether a given relation exists (in the given schema, or the
1071          * default mw one if not given)
1072          */
1073         function relationExists( $table, $types, $schema = false ) {
1074                 global $wgDBmwschema;
1075                 if (!is_array($types))
1076                         $types = array($types);
1077                 if (! $schema )
1078                         $schema = $wgDBmwschema;
1079                 $etable = $this->addQuotes($table);
1080                 $eschema = $this->addQuotes($schema);
1081                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1082                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1083                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1084                 $res = $this->query( $SQL );
1085                 $count = $res ? $res->numRows() : 0;
1086                 if ($res)
1087                         $this->freeResult( $res );
1088                 return $count ? true : false;
1089         }
1090
1091         /*
1092          * For backward compatibility, this function checks both tables and
1093          * views.
1094          */
1095         function tableExists ($table, $schema = false) {
1096                 return $this->relationExists($table, array('r', 'v'), $schema);
1097         }
1098
1099         function sequenceExists ($sequence, $schema = false) {
1100                 return $this->relationExists($sequence, 'S', $schema);
1101         }
1102
1103         function triggerExists($table, $trigger) {
1104                 global $wgDBmwschema;
1105
1106                 $q = <<<END
1107         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1108                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1109                       AND tgrelid=pg_class.oid
1110                       AND nspname=%s AND relname=%s AND tgname=%s
1111 END;
1112                 $res = $this->query(sprintf($q,
1113                                 $this->addQuotes($wgDBmwschema),
1114                                 $this->addQuotes($table),
1115                                 $this->addQuotes($trigger)));
1116                 if (!$res)
1117                         return NULL;
1118                 $rows = $res->numRows();
1119                 $this->freeResult($res);
1120                 return $rows;
1121         }
1122
1123         function ruleExists($table, $rule) {
1124                 global $wgDBmwschema;
1125                 $exists = $this->selectField("pg_rules", "rulename",
1126                                 array(  "rulename" => $rule,
1127                                         "tablename" => $table,
1128                                         "schemaname" => $wgDBmwschema));
1129                 return $exists === $rule;
1130         }
1131
1132         function constraintExists($table, $constraint) {
1133                 global $wgDBmwschema;
1134                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1135                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1136                         $this->addQuotes($wgDBmwschema),
1137                         $this->addQuotes($table),
1138                         $this->addQuotes($constraint));
1139                 $res = $this->query($SQL);
1140                 if (!$res)
1141                         return NULL;
1142                 $rows = $res->numRows();
1143                 $this->freeResult($res);
1144                 return $rows;
1145         }
1146
1147         /**
1148          * Query whether a given schema exists. Returns the name of the owner
1149          */
1150         function schemaExists( $schema ) {
1151                 $eschema = preg_replace("/'/", "''", $schema);
1152                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1153                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1154                 $res = $this->query( $SQL );
1155                 if ( $res && $res->numRows() ) {
1156                         $row = $res->fetchObject();
1157                         $owner = $row->rolname;
1158                 } else {
1159                         $owner = false;
1160                 }
1161                 if ($res)
1162                         $this->freeResult($res);
1163                 return $owner;
1164         }
1165
1166         /**
1167          * Query whether a given column exists in the mediawiki schema
1168          */
1169         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1170                 global $wgDBmwschema;
1171                 $etable = preg_replace("/'/", "''", $table);
1172                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1173                 $ecol = preg_replace("/'/", "''", $field);
1174                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1175                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1176                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1177                 $res = $this->query( $SQL, $fname );
1178                 $count = $res ? $res->numRows() : 0;
1179                 if ($res)
1180                         $this->freeResult( $res );
1181                 return $count;
1182         }
1183
1184         function fieldInfo( $table, $field ) {
1185                 return PostgresField::fromText($this, $table, $field);
1186         }
1187
1188         /**
1189          * pg_field_type() wrapper
1190          */
1191         function fieldType( $res, $index ) {
1192                 if ( $res instanceof ResultWrapper ) {
1193                         $res = $res->result;
1194                 }
1195                 return pg_field_type( $res, $index );
1196         }
1197
1198         function begin( $fname = 'DatabasePostgres::begin' ) {
1199                 $this->query( 'BEGIN', $fname );
1200                 $this->mTrxLevel = 1;
1201         }
1202         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1203                 return true;
1204         }
1205         function commit( $fname = 'DatabasePostgres::commit' ) {
1206                 $this->query( 'COMMIT', $fname );
1207                 $this->mTrxLevel = 0;
1208         }
1209
1210         /* Not even sure why this is used in the main codebase... */
1211         function limitResultForUpdate($sql, $num) {
1212                 return $sql;
1213         }
1214
1215         function setup_database() {
1216                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1217
1218                 // Make sure that we can write to the correct schema
1219                 // If not, Postgres will happily and silently go to the next search_path item
1220                 $ctest = "mediawiki_test_table";
1221                 $safeschema = $this->quote_ident($wgDBmwschema);
1222                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1223                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1224                 }
1225                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1226                 $olde = error_reporting( 0 );
1227                 $res = $this->doQuery($SQL);
1228                 error_reporting( $olde );
1229                 if (!$res) {
1230                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"</li>\n";
1231                         dieout("</ul>");
1232                 }
1233                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1234
1235                 $res = dbsource( "../maintenance/postgres/tables.sql", $this);
1236
1237                 ## Update version information
1238                 $mwv = $this->addQuotes($wgVersion);
1239                 $pgv = $this->addQuotes($this->getServerVersion());
1240                 $pgu = $this->addQuotes($this->mUser);
1241                 $mws = $this->addQuotes($wgDBmwschema);
1242                 $tss = $this->addQuotes($wgDBts2schema);
1243                 $pgp = $this->addQuotes($wgDBport);
1244                 $dbn = $this->addQuotes($this->mDBname);
1245                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
1246
1247                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
1248                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
1249                                 "ctype = '$ctype' ".
1250                                 "WHERE type = 'Creation'";
1251                 $this->query($SQL);
1252
1253                 ## Avoid the non-standard "REPLACE INTO" syntax
1254                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1255                 if ($f == false ) {
1256                         dieout( "<li>Could not find the interwiki.sql file");
1257                 }
1258                 ## We simply assume it is already empty as we have just created it
1259                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1260                 while ( ! feof( $f ) ) {
1261                         $line = fgets($f,1024);
1262                         $matches = array();
1263                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1264                                 continue;
1265                         }
1266                         $this->query("$SQL $matches[1],$matches[2])");
1267                 }
1268                 print " (table interwiki successfully populated)...\n";
1269
1270                 $this->doQuery("COMMIT");
1271         }
1272
1273         function encodeBlob( $b ) {
1274                 return new Blob ( pg_escape_bytea( $b ) ) ;
1275         }
1276
1277         function decodeBlob( $b ) {
1278                 if ($b instanceof Blob) {
1279                         $b = $b->fetch();
1280                 }
1281                 return pg_unescape_bytea( $b );
1282         }
1283
1284         function strencode( $s ) { ## Should not be called by us
1285                 return pg_escape_string( $s );
1286         }
1287
1288         function addQuotes( $s ) {
1289                 if ( is_null( $s ) ) {
1290                         return 'NULL';
1291                 } else if ( is_bool( $s ) ) {
1292                         return intval( $s );
1293                 } else if ($s instanceof Blob) {
1294                         return "'".$s->fetch($s)."'";
1295                 }
1296                 return "'" . pg_escape_string($s) . "'";
1297         }
1298
1299         function quote_ident( $s ) {
1300                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1301         }
1302
1303         /* For now, does nothing */
1304         function selectDB( $db ) {
1305                 return true;
1306         }
1307
1308         /**
1309          * Postgres specific version of replaceVars.
1310          * Calls the parent version in Database.php
1311          *
1312          * @private
1313          *
1314          * @param $ins String: SQL string, read from a stream (usually tables.sql)
1315          *
1316          * @return string SQL string
1317          */
1318         protected function replaceVars( $ins ) {
1319
1320                 $ins = parent::replaceVars( $ins );
1321
1322                 if ($this->numeric_version >= 8.3) {
1323                         // Thanks for not providing backwards-compatibility, 8.3
1324                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1325                 }
1326
1327                 if ($this->numeric_version <= 8.1) { // Our minimum version
1328                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1329                 }
1330
1331                 return $ins;
1332         }
1333
1334         /**
1335          * Various select options
1336          *
1337          * @private
1338          *
1339          * @param $options Array: an associative array of options to be turned into
1340          *              an SQL query, valid keys are listed in the function.
1341          * @return array
1342          */
1343         function makeSelectOptions( $options ) {
1344                 $preLimitTail = $postLimitTail = '';
1345                 $startOpts = $useIndex = '';
1346
1347                 $noKeyOptions = array();
1348                 foreach ( $options as $key => $option ) {
1349                         if ( is_numeric( $key ) ) {
1350                                 $noKeyOptions[$option] = true;
1351                         }
1352                 }
1353
1354                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1355                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1356                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1357
1358                 //if (isset($options['LIMIT'])) {
1359                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1360                 //              isset($options['OFFSET']) ? $options['OFFSET']
1361                 //              : false);
1362                 //}
1363
1364                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1365                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1366                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1367
1368                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1369         }
1370
1371         public function setTimeout( $timeout ) {
1372                 // @todo fixme no-op
1373         }
1374
1375         function ping() {
1376                 wfDebug( "Function ping() not written for DatabasePostgres.php yet");
1377                 return true;
1378         }
1379
1380         /**
1381          * How lagged is this slave?
1382          *
1383          */
1384         public function getLag() {
1385                 # Not implemented for PostgreSQL
1386                 return false;
1387         }
1388
1389         function setFakeSlaveLag( $lag ) {}
1390         function setFakeMaster( $enabled = true ) {}
1391
1392         function getDBname() {
1393                 return $this->mDBname;
1394         }
1395
1396         function getServer() {
1397                 return $this->mServer;
1398         }
1399
1400         function buildConcat( $stringList ) {
1401                 return implode( ' || ', $stringList );
1402         }
1403
1404         /* These are not used yet, but we know we don't want the default version */
1405
1406         public function lock( $lockName, $method ) {
1407                 return true;
1408         }
1409         public function unlock( $lockName, $method ) {
1410                 return true;
1411         }
1412
1413         public function getSearchEngine() {
1414                 return "SearchPostgres";
1415         }
1416
1417 } // end DatabasePostgres class