includes/DatabasePostgres.php

   1 <?php
   2
   3 /**
   4  * This is the Postgres database abstraction layer.
   5  *
   6  * As it includes more generic version for DB functions,
   7  * than MySQL ones, some of them should be moved to parent
   8  * Database class.
   9  *
  10  * @addtogroup Database
  11  */
  12 class PostgresField {
  13         private $name, $tablename, $type, $nullable, $max_length;
  14
  15         static function fromText($db, $table, $field) {
  16         global $wgDBmwschema;
  17
  18                 $q = <<<END
  19 SELECT
  20 CASE WHEN typname = 'int2' THEN 'smallint'
  21 WHEN typname = 'int4' THEN 'integer'
  22 WHEN typname = 'int8' THEN 'bigint'
  23 WHEN typname = 'bpchar' THEN 'char'
  24 ELSE typname END AS typname,
  25 attnotnull, attlen
  26 FROM pg_class, pg_namespace, pg_attribute, pg_type
  27 WHERE relnamespace=pg_namespace.oid
  28 AND relkind='r'
  29 AND attrelid=pg_class.oid
  30 AND atttypid=pg_type.oid
  31 AND nspname=%s
  32 AND relname=%s
  33 AND attname=%s;
  34 END;
  35                 $res = $db->query(sprintf($q,
  36                                 $db->addQuotes($wgDBmwschema),
  37                                 $db->addQuotes($table),
  38                                 $db->addQuotes($field)));
  39                 $row = $db->fetchObject($res);
  40                 if (!$row)
  41                         return null;
  42                 $n = new PostgresField;
  43                 $n->type = $row->typname;
  44                 $n->nullable = ($row->attnotnull == 'f');
  45                 $n->name = $field;
  46                 $n->tablename = $table;
  47                 $n->max_length = $row->attlen;
  48                 return $n;
  49         }
  50
  51         function name() {
  52                 return $this->name;
  53         }
  54
  55         function tableName() {
  56                 return $this->tablename;
  57         }
  58
  59         function type() {
  60                 return $this->type;
  61         }
  62
  63         function nullable() {
  64                 return $this->nullable;
  65         }
  66
  67         function maxLength() {
  68                 return $this->max_length;
  69         }
  70 }
  71
  72 /**
  73  * @addtogroup Database
  74  */
  75 class DatabasePostgres extends Database {
  76         var $mInsertId = NULL;
  77         var $mLastResult = NULL;
  78         var $numeric_version = NULL;
  79
  80         function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
  81                 $failFunction = false, $flags = 0 )
  82         {
  83
  84                 global $wgOut;
  85                 # Can't get a reference if it hasn't been set yet
  86                 if ( !isset( $wgOut ) ) {
  87                         $wgOut = NULL;
  88                 }
  89                 $this->mOut =& $wgOut;
  90                 $this->mFailFunction = $failFunction;
  91                 $this->mFlags = $flags;
  92                 $this->open( $server, $user, $password, $dbName);
  93
  94         }
  95
  96         function cascadingDeletes() {
  97                 return true;
  98         }
  99         function cleanupTriggers() {
 100                 return true;
 101         }
 102         function strictIPs() {
 103                 return true;
 104         }
 105         function realTimestamps() {
 106                 return true;
 107         }
 108         function implicitGroupby() {
 109                 return false;
 110         }
 111         function implicitOrderby() {
 112                 return false;
 113         }
 114         function searchableIPs() {
 115                 return true;
 116         }
 117         function functionalIndexes() {
 118                 return true;
 119         }
 120
 121         function hasConstraint( $name ) {
 122                 $SQL = "SELECT 1 FROM pg_catalog.pg_constraint WHERE conname = '" . pg_escape_string( $name ) . "'";
 123                 return $this->numRows($res = $this->doQuery($SQL));
 124         }
 125
 126         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
 127         {
 128                 return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
 129         }
 130
 131         /**
 132          * Usually aborts on failure
 133          * If the failFunction is set to a non-zero integer, returns success
 134          */
 135         function open( $server, $user, $password, $dbName ) {
 136                 # Test for Postgres support, to avoid suppressed fatal error
 137                 if ( !function_exists( 'pg_connect' ) ) {
 138                         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" );
 139                 }
 140
 141                 global $wgDBport;
 142
 143                 if (!strlen($user)) { ## e.g. the class is being loaded
 144                         return;
 145                 }
 146
 147                 $this->close();
 148                 $this->mServer = $server;
 149                 $port = $wgDBport;
 150                 $this->mUser = $user;
 151                 $this->mPassword = $password;
 152                 $this->mDBname = $dbName;
 153
 154                 $hstring="";
 155                 if ($server!=false && $server!="") {
 156                         $hstring="host=$server ";
 157                 }
 158                 if ($port!=false && $port!="") {
 159                         $hstring .= "port=$port ";
 160                 }
 161
 162
 163                 error_reporting( E_ALL );
 164                 @$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
 165
 166                 if ( $this->mConn == false ) {
 167                         wfDebug( "DB connection error\n" );
 168                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 169                         wfDebug( $this->lastError()."\n" );
 170                         return false;
 171                 }
 172
 173                 $this->mOpened = true;
 174                 ## If this is the initial connection, setup the schema stuff and possibly create the user
 175                 ## TODO: Move this out of open()
 176                 if (defined('MEDIAWIKI_INSTALL')) {
 177                         global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema,
 178                                 $wgDBts2schema;
 179
 180                         print "<li>Checking the version of Postgres...";
 181                         $version = $this->getServerVersion();
 182                         $PGMINVER = "8.1";
 183                         if ($this->numeric_version < $PGMINVER) {
 184                                 print "<b>FAILED</b>. Required version is $PGMINVER. You have $this->numeric_version ($version)</li>\n";
 185                                 dieout("</ul>");
 186                         }
 187                         print "version $this->numeric_version is OK.</li>\n";
 188
 189                         $safeuser = $this->quote_ident($wgDBuser);
 190                         ## Are we connecting as a superuser for the first time?
 191                         if ($wgDBsuperuser) {
 192                                 ## Are we really a superuser? Check out our rights
 193                                 $SQL = "SELECT
 194                                                 CASE WHEN usesuper IS TRUE THEN
 195                                                         CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 196                                                         ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 197                         END AS rights
 198                                                 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
 199                                 $rows = $this->numRows($res = $this->doQuery($SQL));
 200                                 if (!$rows) {
 201                                         print "<li>ERROR: Could not read permissions for user \"$wgDBsuperuser\"</li>\n";
 202                                         dieout('</ul>');
 203                                 }
 204                                 $perms = pg_fetch_result($res, 0, 0);
 205
 206                                 $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
 207                                 $rows = $this->numRows($this->doQuery($SQL));
 208                                 if ($rows) {
 209                                         print "<li>User \"$wgDBuser\" already exists, skipping account creation.</li>";
 210                                 }
 211                                 else {
 212                                         if ($perms != 1 and $perms != 3) {
 213                                                 print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
 214                                                 print 'Please use a different Postgres user.</li>';
 215                                                 dieout('</ul>');
 216                                         }
 217                                         print "<li>Creating user <b>$wgDBuser</b>...";
 218                                         $safepass = $this->addQuotes($wgDBpassword);
 219                                         $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 220                                         $this->doQuery($SQL);
 221                                         print "OK</li>\n";
 222                                 }
 223                                 ## User now exists, check out the database
 224                                 if ($dbName != $wgDBname) {
 225                                         $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
 226                                         $rows = $this->numRows($this->doQuery($SQL));
 227                                         if ($rows) {
 228                                                 print "<li>Database \"$wgDBname\" already exists, skipping database creation.</li>";
 229                                         }
 230                                         else {
 231                                                 if ($perms < 2) {
 232                                                         print "<li>ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
 233                                                         print 'Please use a different Postgres user.</li>';
 234                                                         dieout('</ul>');
 235                                                 }
 236                                                 print "<li>Creating database <b>$wgDBname</b>...";
 237                                                 $safename = $this->quote_ident($wgDBname);
 238                                                 $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 239                                                 $this->doQuery($SQL);
 240                                                 print "OK</li>\n";
 241                                                 ## Hopefully tsearch2 and plpgsql are in template1...
 242                                         }
 243
 244                                         ## Reconnect to check out tsearch2 rights for this user
 245                                         print "<li>Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
 246                                         @$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$user password=$password");
 247                                         if ( $this->mConn == false ) {
 248                                                 print "<b>FAILED TO CONNECT!</b></li>";
 249                                                 dieout("</ul>");
 250                                         }
 251                                         print "OK</li>\n";
 252                                 }
 253
 254                                 ## Tsearch2 checks
 255                                 print "<li>Checking that tsearch2 is installed in the database \"$wgDBname\"...";
 256                                 if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
 257                                         print "<b>FAILED</b>. tsearch2 must be installed in the database \"$wgDBname\".";
 258                                         print "Please see <a href='http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 259                                         print " for instructions or ask on #postgresql on irc.freenode.net</li>\n";
 260                                         dieout("</ul>");
 261                                 }
 262                                 print "OK</li>\n";
 263                                 print "<li>Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
 264                                 foreach (array('cfg','cfgmap','dict','parser') as $table) {
 265                                         $SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
 266                                         $this->doQuery($SQL);
 267                                 }
 268                                 print "OK</li>\n";
 269
 270
 271                                 ## Setup the schema for this user if needed
 272                                 $result = $this->schemaExists($wgDBmwschema);
 273                                 $safeschema = $this->quote_ident($wgDBmwschema);
 274                                 if (!$result) {
 275                                         print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 276                                         $result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
 277                                         if (!$result) {
 278                                                 print "<b>FAILED</b>.</li>\n";
 279                                                 dieout("</ul>");
 280                                         }
 281                                         print "OK</li>\n";
 282                                 }
 283                                 else {
 284                                         print "<li>Schema already exists, explicitly granting rights...\n";
 285                                         $safeschema2 = $this->addQuotes($wgDBmwschema);
 286                                         $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 287                                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 288                                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 289                                                         "AND p.relkind IN ('r','S','v')\n";
 290                                         $SQL .= "UNION\n";
 291                                         $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 292                                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 293                                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 294                                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 295                                         $res = $this->doQuery($SQL);
 296                                         if (!$res) {
 297                                                 print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 298                                                 dieout("</ul>");
 299                                         }
 300                                         $this->doQuery("SET search_path = $safeschema");
 301                                         $rows = $this->numRows($res);
 302                                         while ($rows) {
 303                                                 $rows--;
 304                                                 $this->doQuery(pg_fetch_result($res, $rows, 0));
 305                                         }
 306                                         print "OK</li>";
 307                                 }
 308
 309                                 $wgDBsuperuser = '';
 310                                 return true; ## Reconnect as regular user
 311
 312                         } ## end superuser
 313
 314                 if (!defined('POSTGRES_SEARCHPATH')) {
 315
 316                         ## Do we have the basic tsearch2 table?
 317                         print "<li>Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
 318                         if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
 319                                 print "<b>FAILED</b>. Make sure tsearch2 is installed. See <a href=";
 320                                 print "'http://www.devx.com/opensource/Article/21674/0/page/2'>this article</a>";
 321                                 print " for instructions.</li>\n";
 322                                 dieout("</ul>");
 323                         }
 324                         print "OK</li>\n";
 325
 326                         ## Does this user have the rights to the tsearch2 tables?
 327                         $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
 328                         print "<li>Checking tsearch2 permissions...";
 329                         ## Let's check all four, just to be safe
 330                         error_reporting( 0 );
 331                         $ts2tables = array('cfg','cfgmap','dict','parser');
 332                         foreach ( $ts2tables AS $tname ) {
 333                                 $SQL = "SELECT count(*) FROM $wgDBts2schema.pg_ts_$tname";
 334                                 $res = $this->doQuery($SQL);
 335                                 if (!$res) {
 336                                         print "<b>FAILED</b> to access pg_ts_$tname. Make sure that the user ".
 337                                         "\"$wgDBuser\" has SELECT access to all four tsearch2 tables</li>\n";
 338                                         dieout("</ul>");
 339                                 }
 340                         }
 341                         $SQL = "SELECT ts_name FROM $wgDBts2schema.pg_ts_cfg WHERE locale = '$ctype'";
 342                         $SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
 343                         $res = $this->doQuery($SQL);
 344                         error_reporting( E_ALL );
 345                         if (!$res) {
 346                                 print "<b>FAILED</b>. Could not determine the tsearch2 locale information</li>\n";
 347                                 dieout("</ul>");
 348                         }
 349                         print "OK</li>";
 350
 351                         ## Will the current locale work? Can we force it to?
 352                         print "<li>Verifying tsearch2 locale with $ctype...";
 353                         $rows = $this->numRows($res);
 354                         $resetlocale = 0;
 355                         if (!$rows) {
 356                                 print "<b>not found</b></li>\n";
 357                                 print "<li>Attempting to set default tsearch2 locale to \"$ctype\"...";
 358                                 $resetlocale = 1;
 359                         }
 360                         else {
 361                                 $tsname = pg_fetch_result($res, 0, 0);
 362                                 if ($tsname != 'default') {
 363                                         print "<b>not set to default ($tsname)</b>";
 364                                         print "<li>Attempting to change tsearch2 default locale to \"$ctype\"...";
 365                                         $resetlocale = 1;
 366                                 }
 367                         }
 368                         if ($resetlocale) {
 369                                 $SQL = "UPDATE $wgDBts2schema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
 370                                 $res = $this->doQuery($SQL);
 371                                 if (!$res) {
 372                                         print "<b>FAILED</b>. ";
 373                                         print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"</li>\n";
 374                                         dieout("</ul>");
 375                                 }
 376                                 print "OK</li>";
 377                         }
 378
 379                         ## Final test: try out a simple tsearch2 query
 380                         $SQL = "SELECT $wgDBts2schema.to_tsvector('default','MediaWiki tsearch2 testing')";
 381                         $res = $this->doQuery($SQL);
 382                         if (!$res) {
 383                                 print "<b>FAILED</b>. Specifically, \"$SQL\" did not work.</li>";
 384                                 dieout("</ul>");
 385                         }
 386                         print "OK</li>";
 387
 388                         ## Do we have plpgsql installed?
 389                         print "<li>Checking for Pl/Pgsql ...";
 390                         $SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
 391                         $rows = $this->numRows($this->doQuery($SQL));
 392                         if ($rows < 1) {
 393                                 // plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
 394                                 print "not installed. Attempting to install Pl/Pgsql ...";
 395                                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
 396                                         "WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
 397                                 $rows = $this->numRows($this->doQuery($SQL));
 398                                 if ($rows >= 1) {
 399                                         $olde = error_reporting(0);
 400                                         error_reporting($olde - E_WARNING);
 401                                         $result = $this->doQuery("CREATE LANGUAGE plpgsql");
 402                                         error_reporting($olde);
 403                                         if (!$result) {
 404                                                 print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 405                                                 dieout("</ul>");
 406                                         }
 407                                 }
 408                                 else {
 409                                         print "<b>FAILED</b>. You need to install the language plpgsql in the database <tt>$wgDBname</tt></li>";
 410                                         dieout("</ul>");
 411                                 }
 412                         }
 413                         print "OK</li>\n";
 414
 415                         ## Does the schema already exist? Who owns it?
 416                         $result = $this->schemaExists($wgDBmwschema);
 417                         if (!$result) {
 418                                 print "<li>Creating schema <b>$wgDBmwschema</b> ...";
 419                                 error_reporting( 0 );
 420                                 $result = $this->doQuery("CREATE SCHEMA $wgDBmwschema");
 421                                 error_reporting( E_ALL );
 422                                 if (!$result) {
 423                                         print "<b>FAILED</b>. The user \"$wgDBuser\" must be able to access the schema. ".
 424                                         "You can try making them the owner of the database, or try creating the schema with a ".
 425                                         "different user, and then grant access to the \"$wgDBuser\" user.</li>\n";
 426                                         dieout("</ul>");
 427                                 }
 428                                 print "OK</li>\n";
 429                         }
 430                         else if ($result != $user) {
 431                                 print "<li>Schema \"$wgDBmwschema\" exists but is not owned by \"$user\". Not ideal.</li>\n";
 432                         }
 433                         else {
 434                                 print "<li>Schema \"$wgDBmwschema\" exists and is owned by \"$user\". Excellent.</li>\n";
 435                         }
 436
 437                         ## Always return GMT time to accomodate the existing integer-based timestamp assumption
 438                         print "<li>Setting the timezone to GMT for user \"$user\" ...";
 439                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 440                         $result = pg_query($this->mConn, $SQL);
 441                         if (!$result) {
 442                                 print "<b>FAILED</b>.</li>\n";
 443                                 dieout("</ul>");
 444                         }
 445                         print "OK</li>\n";
 446                         ## Set for the rest of this session
 447                         $SQL = "SET timezone = 'GMT'";
 448                         $result = pg_query($this->mConn, $SQL);
 449                         if (!$result) {
 450                                 print "<li>Failed to set timezone</li>\n";
 451                                 dieout("</ul>");
 452                         }
 453
 454                         print "<li>Setting the datestyle to ISO, YMD for user \"$user\" ...";
 455                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 456                         $result = pg_query($this->mConn, $SQL);
 457                         if (!$result) {
 458                                 print "<b>FAILED</b>.</li>\n";
 459                                 dieout("</ul>");
 460                         }
 461                         print "OK</li>\n";
 462                         ## Set for the rest of this session
 463                         $SQL = "SET datestyle = 'ISO, YMD'";
 464                         $result = pg_query($this->mConn, $SQL);
 465                         if (!$result) {
 466                                 print "<li>Failed to set datestyle</li>\n";
 467                                 dieout("</ul>");
 468                         }
 469
 470                         ## Fix up the search paths if needed
 471                         print "<li>Setting the search path for user \"$user\" ...";
 472                         $path = $this->quote_ident($wgDBmwschema);
 473                         if ($wgDBts2schema !== $wgDBmwschema)
 474                                 $path .= ", ". $this->quote_ident($wgDBts2schema);
 475                         if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
 476                                 $path .= ", public";
 477                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 478                         $result = pg_query($this->mConn, $SQL);
 479                         if (!$result) {
 480                                 print "<b>FAILED</b>.</li>\n";
 481                                 dieout("</ul>");
 482                         }
 483                         print "OK</li>\n";
 484                         ## Set for the rest of this session
 485                         $SQL = "SET search_path = $path";
 486                         $result = pg_query($this->mConn, $SQL);
 487                         if (!$result) {
 488                                 print "<li>Failed to set search_path</li>\n";
 489                                 dieout("</ul>");
 490                         }
 491                         define( "POSTGRES_SEARCHPATH", $path );
 492                 }}
 493
 494                 global $wgCommandLineMode;
 495                 ## If called from the command-line (e.g. importDump), only show errors
 496                 if ($wgCommandLineMode) {
 497                         $this->doQuery("SET client_min_messages = 'ERROR'");
 498                 }
 499
 500                 global $wgDBmwschema, $wgDBts2schema;
 501                 if (isset( $wgDBmwschema ) && isset( $wgDBts2schema )
 502                         && $wgDBmwschema !== 'mediawiki'
 503                         && preg_match( '/^\w+$/', $wgDBmwschema )
 504                         && preg_match( '/^\w+$/', $wgDBts2schema )
 505                 ) {
 506                         $this->doQuery("SET search_path = $wgDBmwschema, $wgDBts2schema, public");
 507                 }
 508
 509                 return $this->mConn;
 510         }
 511
 512         /**
 513          * Closes a database connection, if it is open
 514          * Returns success, true if already closed
 515          */
 516         function close() {
 517                 $this->mOpened = false;
 518                 if ( $this->mConn ) {
 519                         return pg_close( $this->mConn );
 520                 } else {
 521                         return true;
 522                 }
 523         }
 524
 525         function doQuery( $sql ) {
 526                 if (function_exists('mb_convert_encoding')) {
 527                         return $this->mLastResult=pg_query( $this->mConn , mb_convert_encoding($sql,'UTF-8') );
 528                 }
 529                 return $this->mLastResult=pg_query( $this->mConn , $sql);
 530         }
 531
 532         function queryIgnore( $sql, $fname = '' ) {
 533                 return $this->query( $sql, $fname, true );
 534         }
 535
 536         function freeResult( $res ) {
 537                 if ( $res instanceof ResultWrapper ) {
 538                         $res = $res->result;
 539                 }
 540                 if ( !@pg_free_result( $res ) ) {
 541                         throw new DBUnexpectedError($this,  "Unable to free Postgres result\n" );
 542                 }
 543         }
 544
 545         function fetchObject( $res ) {
 546                 if ( $res instanceof ResultWrapper ) {
 547                         $res = $res->result;
 548                 }
 549                 @$row = pg_fetch_object( $res );
 550                 # FIXME: HACK HACK HACK HACK debug
 551
 552                 # TODO:
 553                 # hashar : not sure if the following test really trigger if the object
 554                 #          fetching failed.
 555                 if( pg_last_error($this->mConn) ) {
 556                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 557                 }
 558                 return $row;
 559         }
 560
 561         function fetchRow( $res ) {
 562                 if ( $res instanceof ResultWrapper ) {
 563                         $res = $res->result;
 564                 }
 565                 @$row = pg_fetch_array( $res );
 566                 if( pg_last_error($this->mConn) ) {
 567                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 568                 }
 569                 return $row;
 570         }
 571
 572         function numRows( $res ) {
 573                 if ( $res instanceof ResultWrapper ) {
 574                         $res = $res->result;
 575                 }
 576                 @$n = pg_num_rows( $res );
 577                 if( pg_last_error($this->mConn) ) {
 578                         throw new DBUnexpectedError($this,  'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
 579                 }
 580                 return $n;
 581         }
 582         function numFields( $res ) {
 583                 if ( $res instanceof ResultWrapper ) {
 584                         $res = $res->result;
 585                 }
 586                 return pg_num_fields( $res );
 587         }
 588         function fieldName( $res, $n ) {
 589                 if ( $res instanceof ResultWrapper ) {
 590                         $res = $res->result;
 591                 }
 592                 return pg_field_name( $res, $n );
 593         }
 594
 595         /**
 596          * This must be called after nextSequenceVal
 597          */
 598         function insertId() {
 599                 return $this->mInsertId;
 600         }
 601
 602         function dataSeek( $res, $row ) {
 603                 if ( $res instanceof ResultWrapper ) {
 604                         $res = $res->result;
 605                 }
 606                 return pg_result_seek( $res, $row );
 607         }
 608
 609         function lastError() {
 610                 if ( $this->mConn ) {
 611                         return pg_last_error();
 612                 }
 613                 else {
 614                         return "No database connection";
 615                 }
 616         }
 617         function lastErrno() {
 618                 return pg_last_error() ? 1 : 0;
 619         }
 620
 621         function affectedRows() {
 622                 if( !isset( $this->mLastResult ) or ! $this->mLastResult )
 623                         return 0;
 624
 625                 return pg_affected_rows( $this->mLastResult );
 626         }
 627
 628         /**
 629          * Estimate rows in dataset
 630          * Returns estimated count, based on EXPLAIN output
 631          * This is not necessarily an accurate estimate, so use sparingly
 632          * Returns -1 if count cannot be found
 633          * Takes same arguments as Database::select()
 634          */
 635
 636         function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
 637                 $options['EXPLAIN'] = true;
 638                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 639                 $rows = -1;
 640                 if ( $res ) {
 641                         $row = $this->fetchRow( $res );
 642                         $count = array();
 643                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 644                                 $rows = $count[1];
 645                         }
 646                         $this->freeResult($res);
 647                 }
 648                 return $rows;
 649         }
 650
 651
 652         /**
 653          * Returns information about an index
 654          * If errors are explicitly ignored, returns NULL on failure
 655          */
 656         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 657                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 658                 $res = $this->query( $sql, $fname );
 659                 if ( !$res ) {
 660                         return NULL;
 661                 }
 662                 while ( $row = $this->fetchObject( $res ) ) {
 663                         if ( $row->indexname == $index ) {
 664                                 return $row;
 665                         }
 666                 }
 667                 return false;
 668         }
 669
 670         function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
 671                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 672                         " AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
 673                 $res = $this->query( $sql, $fname );
 674                 if ( !$res )
 675                         return NULL;
 676                 while ($row = $this->fetchObject( $res ))
 677                         return true;
 678                 return false;
 679
 680         }
 681
 682         /**
 683          * INSERT wrapper, inserts an array into a table
 684          *
 685          * $args may be a single associative array, or an array of these with numeric keys,
 686          * for multi-row insert (Postgres version 8.2 and above only).
 687          *
 688          * @param array $table   String: Name of the table to insert to.
 689          * @param array $args    Array: Items to insert into the table.
 690          * @param array $fname   String: Name of the function, for profiling
 691          * @param mixed $options String or Array. Valid options: IGNORE
 692          *
 693          * @return bool Success of insert operation. IGNORE always returns true.
 694          */
 695         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 696                 global $wgDBversion;
 697
 698                 $table = $this->tableName( $table );
 699                 if (! isset( $wgDBversion ) ) {
 700                         $this->getServerVersion();
 701                         $wgDBversion = $this->numeric_version;
 702                 }
 703
 704                 if ( !is_array( $options ) )
 705                         $options = array( $options );
 706
 707                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 708                         $multi = true;
 709                         $keys = array_keys( $args[0] );
 710                 }
 711                 else {
 712                         $multi = false;
 713                         $keys = array_keys( $args );
 714                 }
 715
 716                 $ignore = in_array( 'IGNORE', $options ) ? 1 : 0;
 717                 if ( $ignore )
 718                         $olde = error_reporting( 0 );
 719
 720                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 721
 722                 if ( $multi ) {
 723                         if ( $wgDBversion >= 8.2 ) {
 724                                 $first = true;
 725                                 foreach ( $args as $row ) {
 726                                         if ( $first ) {
 727                                                 $first = false;
 728                                         } else {
 729                                                 $sql .= ',';
 730                                         }
 731                                         $sql .= '(' . $this->makeList( $row ) . ')';
 732                                 }
 733                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 734                         }
 735                         else {
 736                                 $res = true;
 737                                 $origsql = $sql;
 738                                 foreach ( $args as $row ) {
 739                                         $tempsql = $origsql;
 740                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 741                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 742                                         if (! $tempres)
 743                                                 $res = false;
 744                                 }
 745                         }
 746                 }
 747                 else {
 748                         $sql .= '(' . $this->makeList( $args ) . ')';
 749                         $res = (bool)$this->query( $sql, $fname, $ignore );
 750                 }
 751
 752                 if ( $ignore ) {
 753                         $olde = error_reporting( $olde );
 754                         return true;
 755                 }
 756
 757                 return $res;
 758
 759         }
 760
 761         function tableName( $name ) {
 762                 # Replace reserved words with better ones
 763                 switch( $name ) {
 764                         case 'user':
 765                                 return 'mwuser';
 766                         case 'text':
 767                                 return 'pagecontent';
 768                         default:
 769                                 return $name;
 770                 }
 771         }
 772
 773         /**
 774          * Return the next in a sequence, save the value for retrieval via insertId()
 775          */
 776         function nextSequenceValue( $seqName ) {
 777                 $safeseq = preg_replace( "/'/", "''", $seqName );
 778                 $res = $this->query( "SELECT nextval('$safeseq')" );
 779                 $row = $this->fetchRow( $res );
 780                 $this->mInsertId = $row[0];
 781                 $this->freeResult( $res );
 782                 return $this->mInsertId;
 783         }
 784
 785         /**
 786          * Postgres does not have a "USE INDEX" clause, so return an empty string
 787          */
 788         function useIndexClause( $index ) {
 789                 return '';
 790         }
 791
 792         # REPLACE query wrapper
 793         # Postgres simulates this with a DELETE followed by INSERT
 794         # $row is the row to insert, an associative array
 795         # $uniqueIndexes is an array of indexes. Each element may be either a
 796         # field name or an array of field names
 797         #
 798         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 799         # However if you do this, you run the risk of encountering errors which wouldn't have
 800         # occurred in MySQL
 801         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 802                 $table = $this->tableName( $table );
 803
 804                 if (count($rows)==0) {
 805                         return;
 806                 }
 807
 808                 # Single row case
 809                 if ( !is_array( reset( $rows ) ) ) {
 810                         $rows = array( $rows );
 811                 }
 812
 813                 foreach( $rows as $row ) {
 814                         # Delete rows which collide
 815                         if ( $uniqueIndexes ) {
 816                                 $sql = "DELETE FROM $table WHERE ";
 817                                 $first = true;
 818                                 foreach ( $uniqueIndexes as $index ) {
 819                                         if ( $first ) {
 820                                                 $first = false;
 821                                                 $sql .= "(";
 822                                         } else {
 823                                                 $sql .= ') OR (';
 824                                         }
 825                                         if ( is_array( $index ) ) {
 826                                                 $first2 = true;
 827                                                 foreach ( $index as $col ) {
 828                                                         if ( $first2 ) {
 829                                                                 $first2 = false;
 830                                                         } else {
 831                                                                 $sql .= ' AND ';
 832                                                         }
 833                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 834                                                 }
 835                                         } else {
 836                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 837                                         }
 838                                 }
 839                                 $sql .= ')';
 840                                 $this->query( $sql, $fname );
 841                         }
 842
 843                         # Now insert the row
 844                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 845                                 $this->makeList( $row, LIST_COMMA ) . ')';
 846                         $this->query( $sql, $fname );
 847                 }
 848         }
 849
 850         # DELETE where the condition is a join
 851         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 852                 if ( !$conds ) {
 853                         throw new DBUnexpectedError($this,  'Database::deleteJoin() called with empty $conds' );
 854                 }
 855
 856                 $delTable = $this->tableName( $delTable );
 857                 $joinTable = $this->tableName( $joinTable );
 858                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 859                 if ( $conds != '*' ) {
 860                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 861                 }
 862                 $sql .= ')';
 863
 864                 $this->query( $sql, $fname );
 865         }
 866
 867         # Returns the size of a text field, or -1 for "unlimited"
 868         function textFieldSize( $table, $field ) {
 869                 $table = $this->tableName( $table );
 870                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 871                         FROM pg_class c, pg_attribute a, pg_type t
 872                         WHERE relname='$table' AND a.attrelid=c.oid AND
 873                                 a.atttypid=t.oid and a.attname='$field'";
 874                 $res =$this->query($sql);
 875                 $row=$this->fetchObject($res);
 876                 if ($row->ftype=="varchar") {
 877                         $size=$row->size-4;
 878                 } else {
 879                         $size=$row->size;
 880                 }
 881                 $this->freeResult( $res );
 882                 return $size;
 883         }
 884
 885         function lowPriorityOption() {
 886                 return '';
 887         }
 888
 889         function limitResult($sql, $limit,$offset=false) {
 890                 return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
 891         }
 892
 893         /**
 894          * Returns an SQL expression for a simple conditional.
 895          * Uses CASE on Postgres
 896          *
 897          * @param string $cond SQL expression which will result in a boolean value
 898          * @param string $trueVal SQL expression to return if true
 899          * @param string $falseVal SQL expression to return if false
 900          * @return string SQL fragment
 901          */
 902         function conditional( $cond, $trueVal, $falseVal ) {
 903                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
 904         }
 905
 906         function wasDeadlock() {
 907                 return $this->lastErrno() == '40P01';
 908         }
 909
 910         function timestamp( $ts=0 ) {
 911                 return wfTimestamp(TS_POSTGRES,$ts);
 912         }
 913
 914         /**
 915          * Return aggregated value function call
 916          */
 917         function aggregateValue ($valuedata,$valuename='value') {
 918                 return $valuedata;
 919         }
 920
 921
 922         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 923                 # Ignore errors during error handling to avoid infinite recursion
 924                 $ignore = $this->ignoreErrors( true );
 925                 ++$this->mErrorCount;
 926
 927                 if ($ignore || $tempIgnore) {
 928                         wfDebug("SQL ERROR (ignored): $error\n");
 929                         $this->ignoreErrors( $ignore );
 930                 }
 931                 else {
 932                         $message = "A database error has occurred\n" .
 933                                 "Query: $sql\n" .
 934                                 "Function: $fname\n" .
 935                                 "Error: $errno $error\n";
 936                         throw new DBUnexpectedError($this, $message);
 937                 }
 938         }
 939
 940         /**
 941          * @return string wikitext of a link to the server software's web site
 942          */
 943         function getSoftwareLink() {
 944                 return "[http://www.postgresql.org/ PostgreSQL]";
 945         }
 946
 947         /**
 948          * @return string Version information from the database
 949          */
 950         function getServerVersion() {
 951                 $version = pg_fetch_result($this->doQuery("SELECT version()"),0,0);
 952                 $thisver = array();
 953                 if (!preg_match('/PostgreSQL (\d+\.\d+)(\S+)/', $version, $thisver)) {
 954                         die("Could not determine the numeric version from $version!");
 955                 }
 956                 $this->numeric_version = $thisver[1];
 957                 return $version;
 958         }
 959
 960
 961         /**
 962          * Query whether a given relation exists (in the given schema, or the
 963          * default mw one if not given)
 964          */
 965         function relationExists( $table, $types, $schema = false ) {
 966                 global $wgDBmwschema;
 967                 if (!is_array($types))
 968                         $types = array($types);
 969                 if (! $schema )
 970                         $schema = $wgDBmwschema;
 971                 $etable = $this->addQuotes($table);
 972                 $eschema = $this->addQuotes($schema);
 973                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
 974                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
 975                         . "AND c.relkind IN ('" . implode("','", $types) . "')";
 976                 $res = $this->query( $SQL );
 977                 $count = $res ? $res->numRows() : 0;
 978                 if ($res)
 979                         $this->freeResult( $res );
 980                 return $count ? true : false;
 981         }
 982
 983         /*
 984          * For backward compatibility, this function checks both tables and
 985          * views.
 986          */
 987         function tableExists ($table, $schema = false) {
 988                 return $this->relationExists($table, array('r', 'v'), $schema);
 989         }
 990
 991         function sequenceExists ($sequence, $schema = false) {
 992                 return $this->relationExists($sequence, 'S', $schema);
 993         }
 994
 995         function triggerExists($table, $trigger) {
 996                 global $wgDBmwschema;
 997
 998                 $q = <<<END
 999         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1000                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1001                       AND tgrelid=pg_class.oid
1002                       AND nspname=%s AND relname=%s AND tgname=%s
1003 END;
1004                 $res = $this->query(sprintf($q,
1005                                 $this->addQuotes($wgDBmwschema),
1006                                 $this->addQuotes($table),
1007                                 $this->addQuotes($trigger)));
1008                 if (!$res)
1009                         return NULL;
1010                 $rows = $res->numRows();
1011                 $this->freeResult($res);
1012                 return $rows;
1013         }
1014
1015         function ruleExists($table, $rule) {
1016                 global $wgDBmwschema;
1017                 $exists = $this->selectField("pg_rules", "rulename",
1018                                 array(  "rulename" => $rule,
1019                                         "tablename" => $table,
1020                                         "schemaname" => $wgDBmwschema));
1021                 return $exists === $rule;
1022         }
1023
1024         function constraintExists($table, $constraint) {
1025                 global $wgDBmwschema;
1026                 $SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
1027                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1028                         $this->addQuotes($wgDBmwschema),
1029                         $this->addQuotes($table),
1030                         $this->addQuotes($constraint));
1031                 $res = $this->query($SQL);
1032                 if (!$res)
1033                         return NULL;
1034                 $rows = $res->numRows();
1035                 $this->freeResult($res);
1036                 return $rows;
1037         }
1038
1039         /**
1040          * Query whether a given schema exists. Returns the name of the owner
1041          */
1042         function schemaExists( $schema ) {
1043                 $eschema = preg_replace("/'/", "''", $schema);
1044                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1045                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1046                 $res = $this->query( $SQL );
1047                 if ( $res && $res->numRows() ) {
1048                         $row = $res->fetchObject();
1049                         $owner = $row->rolname;
1050                 } else {
1051                         $owner = false;
1052                 }
1053                 if ($res)
1054                         $this->freeResult($res);
1055                 return $owner;
1056         }
1057
1058         /**
1059          * Query whether a given column exists in the mediawiki schema
1060          */
1061         function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
1062                 global $wgDBmwschema;
1063                 $etable = preg_replace("/'/", "''", $table);
1064                 $eschema = preg_replace("/'/", "''", $wgDBmwschema);
1065                 $ecol = preg_replace("/'/", "''", $field);
1066                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
1067                         . "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
1068                         . "AND a.attrelid = c.oid AND a.attname = '$ecol'";
1069                 $res = $this->query( $SQL, $fname );
1070                 $count = $res ? $res->numRows() : 0;
1071                 if ($res)
1072                         $this->freeResult( $res );
1073                 return $count;
1074         }
1075
1076         function fieldInfo( $table, $field ) {
1077                 return PostgresField::fromText($this, $table, $field);
1078         }
1079
1080         function begin( $fname = 'DatabasePostgres::begin' ) {
1081                 $this->query( 'BEGIN', $fname );
1082                 $this->mTrxLevel = 1;
1083         }
1084         function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
1085                 return true;
1086         }
1087         function commit( $fname = 'DatabasePostgres::commit' ) {
1088                 $this->query( 'COMMIT', $fname );
1089                 $this->mTrxLevel = 0;
1090         }
1091
1092         /* Not even sure why this is used in the main codebase... */
1093         function limitResultForUpdate($sql, $num) {
1094                 return $sql;
1095         }
1096
1097         function setup_database() {
1098                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
1099
1100                 ## Make sure that we can write to the correct schema
1101                 ## If not, Postgres will happily and silently go to the next search_path item
1102                 $ctest = "mw_test_table";
1103                 if ($this->tableExists($ctest, $wgDBmwschema)) {
1104                         $this->doQuery("DROP TABLE $wgDBmwschema.$ctest");
1105                 }
1106                 $SQL = "CREATE TABLE $wgDBmwschema.$ctest(a int)";
1107                 $olde = error_reporting( 0 );
1108                 $res = $this->doQuery($SQL);
1109                 error_reporting( $olde );
1110                 if (!$res) {
1111                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"</li>\n";
1112                         dieout("</ul>");
1113                 }
1114                 $this->doQuery("DROP TABLE $wgDBmwschema.mw_test_table");
1115
1116                 dbsource( "../maintenance/postgres/tables.sql", $this);
1117
1118                 ## Version-specific stuff
1119                 if ($this->numeric_version == 8.1) {
1120                         $this->doQuery("CREATE INDEX ts2_page_text ON pagecontent USING gist(textvector)");
1121                         $this->doQuery("CREATE INDEX ts2_page_title ON page USING gist(titlevector)");
1122                 }
1123                 else {
1124                         $this->doQuery("CREATE INDEX ts2_page_text ON pagecontent USING gin(textvector)");
1125                         $this->doQuery("CREATE INDEX ts2_page_title ON page USING gin(titlevector)");
1126                 }
1127
1128                 ## Update version information
1129                 $mwv = $this->addQuotes($wgVersion);
1130                 $pgv = $this->addQuotes($this->getServerVersion());
1131                 $pgu = $this->addQuotes($this->mUser);
1132                 $mws = $this->addQuotes($wgDBmwschema);
1133                 $tss = $this->addQuotes($wgDBts2schema);
1134                 $pgp = $this->addQuotes($wgDBport);
1135                 $dbn = $this->addQuotes($this->mDBname);
1136                 $ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
1137
1138                 $SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
1139                                 "mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
1140                                 "ctype = '$ctype' ".
1141                                 "WHERE type = 'Creation'";
1142                 $this->query($SQL);
1143
1144                 ## Avoid the non-standard "REPLACE INTO" syntax
1145                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1146                 if ($f == false ) {
1147                         dieout( "<li>Could not find the interwiki.sql file");
1148                 }
1149                 ## We simply assume it is already empty as we have just created it
1150                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1151                 while ( ! feof( $f ) ) {
1152                         $line = fgets($f,1024);
1153                         $matches = array();
1154                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
1155                                 continue;
1156                         }
1157                         $this->query("$SQL $matches[1],$matches[2])");
1158                 }
1159                 print " (table interwiki successfully populated)...\n";
1160
1161                 $this->doQuery("COMMIT");
1162         }
1163
1164         function encodeBlob( $b ) {
1165                 return new Blob ( pg_escape_bytea( $b ) ) ;
1166         }
1167
1168         function decodeBlob( $b ) {
1169                 if ($b instanceof Blob) {
1170                         $b = $b->fetch();
1171                 }
1172                 return pg_unescape_bytea( $b );
1173         }
1174
1175         function strencode( $s ) { ## Should not be called by us
1176                 return pg_escape_string( $s );
1177         }
1178
1179         function addQuotes( $s ) {
1180                 if ( is_null( $s ) ) {
1181                         return 'NULL';
1182                 } else if ($s instanceof Blob) {
1183                         return "'".$s->fetch($s)."'";
1184                 }
1185                 return "'" . pg_escape_string($s) . "'";
1186         }
1187
1188         function quote_ident( $s ) {
1189                 return '"' . preg_replace( '/"/', '""', $s) . '"';
1190         }
1191
1192         /* For now, does nothing */
1193         function selectDB( $db ) {
1194                 return true;
1195         }
1196
1197         /**
1198          * Various select options
1199          *
1200          * @private
1201          *
1202          * @param array $options an associative array of options to be turned into
1203          *              an SQL query, valid keys are listed in the function.
1204          * @return array
1205          */
1206         function makeSelectOptions( $options ) {
1207                 $preLimitTail = $postLimitTail = '';
1208                 $startOpts = $useIndex = '';
1209
1210                 $noKeyOptions = array();
1211                 foreach ( $options as $key => $option ) {
1212                         if ( is_numeric( $key ) ) {
1213                                 $noKeyOptions[$option] = true;
1214                         }
1215                 }
1216
1217                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
1218                 if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
1219                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
1220
1221                 //if (isset($options['LIMIT'])) {
1222                 //      $tailOpts .= $this->limitResult('', $options['LIMIT'],
1223                 //              isset($options['OFFSET']) ? $options['OFFSET']
1224                 //              : false);
1225                 //}
1226
1227                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
1228                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
1229                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1230
1231                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1232         }
1233
1234         public function setTimeout( $timeout ) {
1235                 // @todo fixme no-op
1236         }
1237
1238         function ping() {
1239                 wfDebug( "Function ping() not written for DatabasePostgres.php yet");
1240                 return true;
1241         }
1242
1243         /**
1244          * How lagged is this slave?
1245          *
1246          */
1247         public function getLag() {
1248                 # Not implemented for PostgreSQL
1249                 return false;
1250         }
1251
1252         function buildConcat( $stringList ) {
1253                 return implode( ' || ', $stringList );
1254         }
1255
1256 } // end DatabasePostgres class
1257
1258