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 == $this->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%(" .
 711                         $this->strencode( $this->indexName( $index ) ) .
 712                         ")'";
 713                 $res = $this->query( $sql, $fname );
 714                 if ( !$res )
 715                         return NULL;
 716                 while ($row = $this->fetchObject( $res ))
 717                         return true;
 718                 return false;
 719
 720         }
 721
 722         /**
 723          * INSERT wrapper, inserts an array into a table
 724          *
 725          * $args may be a single associative array, or an array of these with numeric keys,
 726          * for multi-row insert (Postgres version 8.2 and above only).
 727          *
 728          * @param $table   String: Name of the table to insert to.
 729          * @param $args    Array: Items to insert into the table.
 730          * @param $fname   String: Name of the function, for profiling
 731          * @param $options String or Array. Valid options: IGNORE
 732          *
 733          * @return bool Success of insert operation. IGNORE always returns true.
 734          */
 735         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 736                 global $wgDBversion;
 737
 738                 if ( !count( $args ) ) {
 739                         return true;
 740                 }
 741
 742                 $table = $this->tableName( $table );
 743                 if (! isset( $wgDBversion ) ) {
 744                         $wgDBversion = $this->getServerVersion();
 745                 }
 746
 747                 if ( !is_array( $options ) )
 748                         $options = array( $options );
 749
 750                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 751                         $multi = true;
 752                         $keys = array_keys( $args[0] );
 753                 }
 754                 else {
 755                         $multi = false;
 756                         $keys = array_keys( $args );
 757                 }
 758
 759                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 760                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 761
 762                 // If we are not in a transaction, we need to be for savepoint trickery
 763                 $didbegin = 0;
 764                 if ( $ignore ) {
 765                         if (! $this->mTrxLevel) {
 766                                 $this->begin();
 767                                 $didbegin = 1;
 768                         }
 769                         $olde = error_reporting( 0 );
 770                         // For future use, we may want to track the number of actual inserts
 771                         // Right now, insert (all writes) simply return true/false
 772                         $numrowsinserted = 0;
 773                 }
 774
 775                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 776
 777                 if ( $multi ) {
 778                         if ( $wgDBversion >= 8.2 && !$ignore ) {
 779                                 $first = true;
 780                                 foreach ( $args as $row ) {
 781                                         if ( $first ) {
 782                                                 $first = false;
 783                                         } else {
 784                                                 $sql .= ',';
 785                                         }
 786                                         $sql .= '(' . $this->makeList( $row ) . ')';
 787                                 }
 788                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 789                         }
 790                         else {
 791                                 $res = true;
 792                                 $origsql = $sql;
 793                                 foreach ( $args as $row ) {
 794                                         $tempsql = $origsql;
 795                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 796
 797                                         if ( $ignore ) {
 798                                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 799                                         }
 800
 801                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 802
 803                                         if ( $ignore ) {
 804                                                 $bar = pg_last_error();
 805                                                 if ($bar != false) {
 806                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 807                                                 }
 808                                                 else {
 809                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 810                                                         $numrowsinserted++;
 811                                                 }
 812                                         }
 813
 814                                         // If any of them fail, we fail overall for this function call
 815                                         // Note that this will be ignored if IGNORE is set
 816                                         if (! $tempres)
 817                                                 $res = false;
 818                                 }
 819                         }
 820                 }
 821                 else {
 822                         // Not multi, just a lone insert
 823                         if ( $ignore ) {
 824                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 825                         }
 826
 827                         $sql .= '(' . $this->makeList( $args ) . ')';
 828                         $res = (bool)$this->query( $sql, $fname, $ignore );
 829                         if ( $ignore ) {
 830                                 $bar = pg_last_error();
 831                                 if ($bar != false) {
 832                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 833                                 }
 834                                 else {
 835                                         pg_query( $this->mConn, "RELEASE $ignore" );
 836                                         $numrowsinserted++;
 837                                 }
 838                         }
 839                 }
 840                 if ( $ignore ) {
 841                         $olde = error_reporting( $olde );
 842                         if ($didbegin) {
 843                                 $this->commit();
 844                         }
 845
 846                         // Set the affected row count for the whole operation
 847                         $this->mAffectedRows = $numrowsinserted;
 848
 849                         // IGNORE always returns true
 850                         return true;
 851                 }
 852
 853
 854                 return $res;
 855
 856         }
 857
 858         function tableName( $name ) {
 859                 # Replace reserved words with better ones
 860                 switch( $name ) {
 861                         case 'user':
 862                                 return 'mwuser';
 863                         case 'text':
 864                                 return 'pagecontent';
 865                         default:
 866                                 return $name;
 867                 }
 868         }
 869
 870         /**
 871          * Return the next in a sequence, save the value for retrieval via insertId()
 872          */
 873         function nextSequenceValue( $seqName ) {
 874                 $safeseq = preg_replace( "/'/", "''", $seqName );
 875                 $res = $this->query( "SELECT nextval('$safeseq')" );
 876                 $row = $this->fetchRow( $res );
 877                 $this->mInsertId = $row[0];
 878                 $this->freeResult( $res );
 879                 return $this->mInsertId;
 880         }
 881
 882         /**
 883          * Return the current value of a sequence. Assumes it has ben nextval'ed in this session.
 884          */
 885         function currentSequenceValue( $seqName ) {
 886                 $safeseq = preg_replace( "/'/", "''", $seqName );
 887                 $res = $this->query( "SELECT currval('$safeseq')" );
 888                 $row = $this->fetchRow( $res );
 889                 $currval = $row[0];
 890                 $this->freeResult( $res );
 891                 return $currval;
 892         }
 893
 894         /**
 895          * Postgres does not have a "USE INDEX" clause, so return an empty string
 896          */
 897         function useIndexClause( $index ) {
 898                 return '';
 899         }
 900
 901         # REPLACE query wrapper
 902         # Postgres simulates this with a DELETE followed by INSERT
 903         # $row is the row to insert, an associative array
 904         # $uniqueIndexes is an array of indexes. Each element may be either a
 905         # field name or an array of field names
 906         #
 907         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 908         # However if you do this, you run the risk of encountering errors which wouldn't have
 909         # occurred in MySQL
 910         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 911                 $table = $this->tableName( $table );
 912
 913                 if (count($rows)==0) {
 914                         return;
 915                 }
 916
 917                 # Single row case
 918                 if ( !is_array( reset( $rows ) ) ) {
 919                         $rows = array( $rows );
 920                 }
 921
 922                 foreach( $rows as $row ) {
 923                         # Delete rows which collide
 924                         if ( $uniqueIndexes ) {
 925                                 $sql = "DELETE FROM $table WHERE ";
 926                                 $first = true;
 927                                 foreach ( $uniqueIndexes as $index ) {
 928                                         if ( $first ) {
 929                                                 $first = false;
 930                                                 $sql .= "(";
 931                                         } else {
 932                                                 $sql .= ') OR (';
 933                                         }
 934                                         if ( is_array( $index ) ) {
 935                                                 $first2 = true;
 936                                                 foreach ( $index as $col ) {
 937                                                         if ( $first2 ) {
 938                                                                 $first2 = false;
 939                                                         } else {
 940                                                                 $sql .= ' AND ';
 941                                                         }
 942                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 943                                                 }
 944                                         } else {
 945                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 946                                         }
 947                                 }
 948                                 $sql .= ')';
 949                                 $this->query( $sql, $fname );
 950                         }
 951
 952                         # Now insert the row
 953                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 954                                 $this->makeList( $row, LIST_COMMA ) . ')';
 955                         $this->query( $sql, $fname );
 956                 }
 957         }
 958
 959         # DELETE where the condition is a join
 960         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 961                 if ( !$conds ) {
 962                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 963                 }
 964
 965                 $delTable = $this->tableName( $delTable );
 966                 $joinTable = $this->tableName( $joinTable );
 967                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 968                 if ( $conds != '*' ) {
 969                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 970                 }
 971                 $sql .= ')';
 972
 973                 $this->query( $sql, $fname );
 974         }
 975
 976         # Returns the size of a text field, or -1 for "unlimited"
 977         function textFieldSize( $table, $field ) {
 978                 $table = $this->tableName( $table );
 979                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 980                         FROM pg_class c, pg_attribute a, pg_type t
 981                         WHERE relname='$table' AND a.attrelid=c.oid AND
 982                                 a.atttypid=t.oid and a.attname='$field'";
 983                 $res =$this->query($sql);
 984                 $row=$this->fetchObject($res);
 985                 if ($row->ftype=="varchar") {
 986                         $size=$row->size-4;
 987                 } else {
 988                         $size=$row->size;
 989                 }
 990                 $this->freeResult( $res );
 991                 return $size;
 992         }
 993
 994         function lowPriorityOption() {
 995                 return '';
 996         }
 997
 998         function limitResult($sql, $limit, $offset=false) {
 999                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
1000         }
1001
1002         /**
1003          * Returns an SQL expression for a simple conditional.
1004          * Uses CASE on Postgres
1005          *
1006          * @param $cond String: SQL expression which will result in a boolean value
1007          * @param $trueVal String: SQL expression to return if true
1008          * @param $falseVal String: SQL expression to return if false
1009          * @return String: SQL fragment
1010          */
1011         function conditional( $cond, $trueVal, $falseVal ) {
1012                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
1013         }
1014
1015         function wasDeadlock() {
1016                 return $this->lastErrno() == '40P01';
1017         }
1018
1019         function timestamp( $ts=0 ) {
1020                 return wfTimestamp(TS_POSTGRES,$ts);
1021         }
1022
1023         /**
1024          * Return aggregated value function call
1025          */
1026         function aggregateValue ($valuedata,$valuename='value') {
1027                 return $valuedata;
1028         }
1029
1030
1031         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
1032                 // Ignore errors during error handling to avoid infinite recursion
1033                 $ignore = $this->ignoreErrors( true );
1034                 $this->mErrorCount++;
1035
1036                 if ($ignore || $tempIgnore) {
1037                         wfDebug("SQL ERROR (ignored): $error\n");
1038                         $this->ignoreErrors( $ignore );
1039                 }
1040                 else {
1041                         $message = "A database error has occurred\n" .
1042                                 "Query: $sql\n" .
1043                                 "Function: $fname\n" .
1044                                 "Error: $errno $error\n";
1045                         throw new DBUnexpectedError($this, $message);
1046                 }
1047         }
1048
1049         /**
1050          * @return string wikitext of a link to the server software's web site
1051          */
1052         function getSoftwareLink() {
1053                 return "[http://www.postgresql.org/ PostgreSQL]";
1054         }
1055
1056         /**
1057          * @return string Version information from the database
1058          */
1059         function getServerVersion() {
1060                 $versionInfo = pg_version( $this->mConn );
1061                 if ( isset( $versionInfo['server'] ) ) {
1062                         $this->numeric_version = $versionInfo['server'];
1063                 } else {
1064                         // There's no way to identify the precise version before 7.4, but
1065                         // it doesn't matter anyway since we're just going to give an error.
1066                         $this->numeric_version = '7.3 or earlier';
1067                 }
1068                 return $this->numeric_version;
1069         }
1070
1071         /**
1072          * Query whether a given relation exists (in the given schema, or the
1073          * default mw one if not given)
1074          */
1075         function relationExists( $table, $types, $schema = false ) {
1076                 global $wgDBmwschema;
1077                 if (!is_array($types))
1078                         $types = array($types);
1079                 if (! $schema )
1080                         $schema = $wgDBmwschema;
1081                 $etable = $this->addQuotes($table);
1082                 $eschema = $this->addQuotes($schema);
1083                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1084                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1085                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
1086                 $res = $this->query( $SQL );
1087                 $count = $res ? $res->numRows() : 0;
1088                 if ($res)
1089                         $this->freeResult( $res );
1090                 return $count ? true : false;
1091         }
1092
1093         /*
1094          * For backward compatibility, this function checks both tables and
1095          * views.
1096          */
1097         function tableExists ($table, $schema = false) {
1098                 return $this->relationExists($table, array('r', 'v'), $schema);
1099         }
1100
1101         function sequenceExists ($sequence, $schema = false) {
1102                 return $this->relationExists($sequence, 'S', $schema);
1103         }
1104
1105         function triggerExists($table, $trigger) {
1106                 global $wgDBmwschema;
1107
1108                 $q = <<<END
1109         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1110                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1111                       AND tgrelid=pg_class.oid
1112                       AND nspname=%s AND relname=%s AND tgname=%s
1113 END;
1114                 $res = $this->query(sprintf($q,
1115                                 $this->addQuotes($wgDBmwschema),
1116                                 $this->addQuotes($table),
1117                                 $this->addQuotes($trigger)));
1118                 if (!$res)
1119                         return NULL;
1120                 $rows = $res->numRows();
1121                 $this->freeResult($res);
1122                 return $rows;
1123         }
1124
1125         function ruleExists($table, $rule) {
1126                 global $wgDBmwschema;
1127                 $exists = $this->selectField("pg_rules", "rulename",
1128                                 array(  "rulename" => $rule,
1129                                         "tablename" => $table,
1130                                         "schemaname" => $wgDBmwschema));
1131                 return $exists === $rule;
1132         }
1133
1134         function constraintExists($table, $constraint) {
1135                 global $wgDBmwschema;
1136                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1137                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1138                         $this->addQuotes($wgDBmwschema),
1139                         $this->addQuotes($table),
1140                         $this->addQuotes($constraint));
1141                 $res = $this->query($SQL);
1142                 if (!$res)
1143                         return NULL;
1144                 $rows = $res->numRows();
1145                 $this->freeResult($res);
1146                 return $rows;
1147         }
1148
1149         /**
1150          * Query whether a given schema exists. Returns the name of the owner
1151          */
1152         function schemaExists( $schema ) {
1153                 $eschema = preg_replace("/'/", "''", $schema);
1154                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1155                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1156                 $res = $this->query( $SQL );
1157                 if ( $res && $res->numRows() ) {
1158                         $row = $res->fetchObject();
1159                         $owner = $row->rolname;
1160                 } else {
1161                         $owner = false;
1162                 }
1163                 if ($res)
1164                         $this->freeResult($res);
1165                 return $owner;
1166         }
1167
1168         /**
1169          * Query whether a given column exists in the mediawiki schema
1170          */
1171         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1172                 global $wgDBmwschema;
1173                 $etable = preg_replace("/'/", "''", $table);
1174                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1175                 $ecol = preg_replace("/'/", "''", $field);
1176                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1177                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1178                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1179                 $res = $this->query( $SQL, $fname );
1180                 $count = $res ? $res->numRows() : 0;
1181                 if ($res)
1182                         $this->freeResult( $res );
1183                 return $count;
1184         }
1185
1186         function fieldInfo( $table, $field ) {
1187                 return PostgresField::fromText($this, $table, $field);
1188         }
1189
1190         /**
1191          * pg_field_type() wrapper
1192          */
1193         function fieldType( $res, $index ) {
1194                 if ( $res instanceof ResultWrapper ) {
1195                         $res = $res->result;
1196                 }
1197                 return pg_field_type( $res, $index );
1198         }
1199
1200         function begin( $fname = 'DatabasePostgres::begin' ) {
1201                 $this->query( 'BEGIN', $fname );
1202                 $this->mTrxLevel = 1;
1203         }
1204         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1205                 return true;
1206         }
1207         function commit( $fname = 'DatabasePostgres::commit' ) {
1208                 $this->query( 'COMMIT', $fname );
1209                 $this->mTrxLevel = 0;
1210         }
1211
1212         /* Not even sure why this is used in the main codebase... */
1213         function limitResultForUpdate($sql, $num) {
1214                 return $sql;
1215         }
1216
1217         function setup_database() {
1218                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1219
1220                 // Make sure that we can write to the correct schema
1221                 // If not, Postgres will happily and silently go to the next search_path item
1222                 $ctest = "mediawiki_test_table";
1223                 $safeschema = $this->quote_ident($wgDBmwschema);
1224                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1225                         $this->doQuery("DROP TABLE $safeschema.$ctest");
1226                 }
1227                 $SQL = "CREATE TABLE $safeschema.$ctest(a int)";
1228                 $olde = error_reporting( 0 );
1229                 $res = $this->doQuery($SQL);
1230                 error_reporting( $olde );
1231                 if (!$res) {
1232                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"</li>\n";
1233                         dieout("</ul>");
1234                 }
1235                 $this->doQuery("DROP TABLE $safeschema.$ctest");
1236
1237                 $res = dbsource( "../maintenance/postgres/tables.sql", $this);
1238
1239                 ## Update version information
1240                 $mwv = $this->addQuotes($wgVersion);
1241                 $pgv = $this->addQuotes($this->getServerVersion());
1242                 $pgu = $this->addQuotes($this->mUser);
1243                 $mws = $this->addQuotes($wgDBmwschema);
1244                 $tss = $this->addQuotes($wgDBts2schema);
1245                 $pgp = $this->addQuotes($wgDBport);
1246                 $dbn = $this->addQuotes($this->mDBname);
1247                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
1248
1249                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
1250                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
1251                                 "ctype = '$ctype' ".
1252                                 "WHERE type = 'Creation'";
1253                 $this->query($SQL);
1254
1255                 ## Avoid the non-standard "REPLACE INTO" syntax
1256                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1257                 if ($f == false ) {
1258                         dieout( "<li>Could not find the interwiki.sql file");
1259                 }
1260                 ## We simply assume it is already empty as we have just created it
1261                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1262                 while ( ! feof( $f ) ) {
1263                         $line = fgets($f,1024);
1264                         $matches = array();
1265                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1266                                 continue;
1267                         }
1268                         $this->query("$SQL $matches[1],$matches[2])");
1269                 }
1270                 print " (table interwiki successfully populated)...\n";
1271
1272                 $this->doQuery("COMMIT");
1273         }
1274
1275         function encodeBlob( $b ) {
1276                 return new Blob ( pg_escape_bytea( $b ) ) ;
1277         }
1278
1279         function decodeBlob( $b ) {
1280                 if ($b instanceof Blob) {
1281                         $b = $b->fetch();
1282                 }
1283                 return pg_unescape_bytea( $b );
1284         }
1285
1286         function strencode( $s ) { ## Should not be called by us
1287                 return pg_escape_string( $s );
1288         }
1289
1290         function addQuotes( $s ) {
1291                 if ( is_null( $s ) ) {
1292                         return 'NULL';
1293                 } else if ( is_bool( $s ) ) {
1294                         return intval( $s );
1295                 } else if ($s instanceof Blob) {
1296                         return "'".$s->fetch($s)."'";
1297                 }
1298                 return "'" . pg_escape_string($s) . "'";
1299         }
1300
1301         function quote_ident( $s ) {
1302                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1303         }
1304
1305         /* For now, does nothing */
1306         function selectDB( $db ) {
1307                 return true;
1308         }
1309
1310         /**
1311          * Postgres specific version of replaceVars.
1312          * Calls the parent version in Database.php
1313          *
1314          * @private
1315          *
1316          * @param $ins String: SQL string, read from a stream (usually tables.sql)
1317          *
1318          * @return string SQL string
1319          */
1320         protected function replaceVars( $ins ) {
1321
1322                 $ins = parent::replaceVars( $ins );
1323
1324                 if ($this->numeric_version >= 8.3) {
1325                         // Thanks for not providing backwards-compatibility, 8.3
1326                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1327                 }
1328
1329                 if ($this->numeric_version <= 8.1) { // Our minimum version
1330                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1331                 }
1332
1333                 return $ins;
1334         }
1335
1336         /**
1337          * Various select options
1338          *
1339          * @private
1340          *
1341          * @param $options Array: an associative array of options to be turned into
1342          *              an SQL query, valid keys are listed in the function.
1343          * @return array
1344          */
1345         function makeSelectOptions( $options ) {
1346                 $preLimitTail = $postLimitTail = '';
1347                 $startOpts = $useIndex = '';
1348
1349                 $noKeyOptions = array();
1350                 foreach ( $options as $key => $option ) {
1351                         if ( is_numeric( $key ) ) {
1352                                 $noKeyOptions[$option] = true;
1353                         }
1354                 }
1355
1356                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1357                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1358                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1359
1360                 //if (isset($options['LIMIT'])) {
1361                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1362                 //              isset($options['OFFSET']) ? $options['OFFSET']
1363                 //              : false);
1364                 //}
1365
1366                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1367                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1368                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1369
1370                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1371         }
1372
1373         public function setTimeout( $timeout ) {
1374                 // @todo fixme no-op
1375         }
1376
1377         function ping() {
1378                 wfDebug( "Function ping() not written for DatabasePostgres.php yet");
1379                 return true;
1380         }
1381
1382         /**
1383          * How lagged is this slave?
1384          *
1385          */
1386         public function getLag() {
1387                 # Not implemented for PostgreSQL
1388                 return false;
1389         }
1390
1391         function setFakeSlaveLag( $lag ) {}
1392         function setFakeMaster( $enabled = true ) {}
1393
1394         function getDBname() {
1395                 return $this->mDBname;
1396         }
1397
1398         function getServer() {
1399                 return $this->mServer;
1400         }
1401
1402         function buildConcat( $stringList ) {
1403                 return implode( ' || ', $stringList );
1404         }
1405
1406         /* These are not used yet, but we know we don't want the default version */
1407
1408         public function lock( $lockName, $method ) {
1409                 return true;
1410         }
1411         public function unlock( $lockName, $method ) {
1412                 return true;
1413         }
1414
1415         public function getSearchEngine() {
1416                 return "SearchPostgres";
1417         }
1418
1419 } // end DatabasePostgres class