includes/db/DatabasePostgres.php

   1 <?php
   2 /**
   3  * This is the Postgres database abstraction layer.
   4  *
   5  * @file
   6  * @ingroup Database
   7  */
   8
   9 class PostgresField implements Field {
  10         private $name, $tablename, $type, $nullable, $max_length, $deferred, $deferrable, $conname;
  11
  12         static function fromText($db, $table, $field) {
  13         global $wgDBmwschema;
  14
  15                 $q = <<<SQL
  16 SELECT
  17  attnotnull, attlen, COALESCE(conname, '') AS conname,
  18  COALESCE(condeferred, 'f') AS deferred,
  19  COALESCE(condeferrable, 'f') AS deferrable,
  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 FROM pg_class c
  26 JOIN pg_namespace n ON (n.oid = c.relnamespace)
  27 JOIN pg_attribute a ON (a.attrelid = c.oid)
  28 JOIN pg_type t ON (t.oid = a.atttypid)
  29 LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
  30 WHERE relkind = 'r'
  31 AND nspname=%s
  32 AND relname=%s
  33 AND attname=%s;
  34 SQL;
  35
  36                 $table = $db->tableName( $table );
  37                 $res = $db->query(
  38                         sprintf( $q,
  39                                 $db->addQuotes( $wgDBmwschema ),
  40                                 $db->addQuotes( $table ),
  41                                 $db->addQuotes( $field )
  42                         )
  43                 );
  44                 $row = $db->fetchObject( $res );
  45                 if ( !$row ) {
  46                         return null;
  47                 }
  48                 $n = new PostgresField;
  49                 $n->type = $row->typname;
  50                 $n->nullable = ( $row->attnotnull == 'f' );
  51                 $n->name = $field;
  52                 $n->tablename = $table;
  53                 $n->max_length = $row->attlen;
  54                 $n->deferrable = ( $row->deferrable == 't' );
  55                 $n->deferred = ( $row->deferred == 't' );
  56                 $n->conname = $row->conname;
  57                 return $n;
  58         }
  59
  60         function name() {
  61                 return $this->name;
  62         }
  63
  64         function tableName() {
  65                 return $this->tablename;
  66         }
  67
  68         function type() {
  69                 return $this->type;
  70         }
  71
  72         function isNullable() {
  73                 return $this->nullable;
  74         }
  75
  76         function maxLength() {
  77                 return $this->max_length;
  78         }
  79
  80         function is_deferrable() {
  81                 return $this->deferrable;
  82         }
  83
  84         function is_deferred() {
  85                 return $this->deferred;
  86         }
  87
  88         function conname() {
  89                 return $this->conname;
  90         }
  91
  92 }
  93
  94 /**
  95  * @ingroup Database
  96  */
  97 class DatabasePostgres extends DatabaseBase {
  98         var $mInsertId = null;
  99         var $mLastResult = null;
 100         var $numeric_version = null;
 101         var $mAffectedRows = null;
 102
 103         function getType() {
 104                 return 'postgres';
 105         }
 106
 107         function cascadingDeletes() {
 108                 return true;
 109         }
 110         function cleanupTriggers() {
 111                 return true;
 112         }
 113         function strictIPs() {
 114                 return true;
 115         }
 116         function realTimestamps() {
 117                 return true;
 118         }
 119         function implicitGroupby() {
 120                 return false;
 121         }
 122         function implicitOrderby() {
 123                 return false;
 124         }
 125         function searchableIPs() {
 126                 return true;
 127         }
 128         function functionalIndexes() {
 129                 return true;
 130         }
 131
 132         function hasConstraint( $name ) {
 133                 global $wgDBmwschema;
 134                 $SQL = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n WHERE c.connamespace = n.oid AND conname = '" .
 135                                 pg_escape_string( $this->mConn, $name ) . "' AND n.nspname = '" . pg_escape_string( $this->mConn, $wgDBmwschema ) ."'";
 136                 $res = $this->doQuery( $SQL );
 137                 return $this->numRows( $res );
 138         }
 139
 140         /**
 141          * Usually aborts on failure
 142          */
 143         function open( $server, $user, $password, $dbName ) {
 144                 # Test for Postgres support, to avoid suppressed fatal error
 145                 if ( !function_exists( 'pg_connect' ) ) {
 146                         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" );
 147                 }
 148
 149                 global $wgDBport;
 150
 151                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 152                         return;
 153                 }
 154
 155                 $this->close();
 156                 $this->mServer = $server;
 157                 $this->mPort = $port = $wgDBport;
 158                 $this->mUser = $user;
 159                 $this->mPassword = $password;
 160                 $this->mDBname = $dbName;
 161
 162                 $connectVars = array(
 163                         'dbname' => $dbName,
 164                         'user' => $user,
 165                         'password' => $password
 166                 );
 167                 if ( $server != false && $server != '' ) {
 168                         $connectVars['host'] = $server;
 169                 }
 170                 if ( $port != false && $port != '' ) {
 171                         $connectVars['port'] = $port;
 172                 }
 173                 $connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
 174
 175                 $this->installErrorHandler();
 176                 $this->mConn = pg_connect( $connectString );
 177                 $phpError = $this->restoreErrorHandler();
 178
 179                 if ( !$this->mConn ) {
 180                         wfDebug( "DB connection error\n" );
 181                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 182                         wfDebug( $this->lastError() . "\n" );
 183                         throw new DBConnectionError( $this, $phpError );
 184                 }
 185
 186                 $this->mOpened = true;
 187
 188                 global $wgCommandLineMode;
 189                 # If called from the command-line (e.g. importDump), only show errors
 190                 if ( $wgCommandLineMode ) {
 191                         $this->doQuery( "SET client_min_messages = 'ERROR'" );
 192                 }
 193
 194                 $this->doQuery( "SET client_encoding='UTF8'" );
 195                 $this->doQuery( "SET datestyle = 'ISO, YMD'" );
 196                 $this->doQuery( "SET timezone = 'GMT'" );
 197
 198                 global $wgDBmwschema;
 199                 if ( isset( $wgDBmwschema )
 200                         && $wgDBmwschema !== 'mediawiki'
 201                         && preg_match( '/^\w+$/', $wgDBmwschema )
 202                 ) {
 203                         $safeschema = $this->addIdentifierQuotes( $wgDBmwschema );
 204                         $this->doQuery( "SET search_path = $safeschema, public" );
 205                 }
 206
 207                 return $this->mConn;
 208         }
 209
 210         function makeConnectionString( $vars ) {
 211                 $s = '';
 212                 foreach ( $vars as $name => $value ) {
 213                         $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
 214                 }
 215                 return $s;
 216         }
 217
 218
 219         function initial_setup( $superuser, $password, $dbName ) {
 220                 // If this is the initial connection, setup the schema stuff and possibly create the user
 221                 global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBmwschema, $wgDBts2schema;
 222
 223                 $safeuser = $this->addIdentifierQuotes( $wgDBuser );
 224                 // Are we connecting as a superuser for the first time?
 225                 if ( $superuser ) {
 226                         // Are we really a superuser? Check out our rights
 227                         $SQL = "SELECT
 228                       CASE WHEN usesuper IS TRUE THEN
 229                       CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
 230                       ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
 231                     END AS rights
 232                     FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes( $superuser );
 233                         $rows = $this->numRows( $res = $this->doQuery( $SQL ) );
 234                         if ( !$rows ) {
 235                                 print '<li>ERROR: Could not read permissions for user "' . htmlspecialchars( $superuser ) . "\"</li>\n";
 236                                 dieout( );
 237                         }
 238                         $perms = pg_fetch_result( $res, 0, 0 );
 239
 240                         $SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes( $wgDBuser );
 241                         $rows = $this->numRows( $this->doQuery( $SQL ) );
 242                         if ( $rows ) {
 243                                 print '<li>User "' . htmlspecialchars( $wgDBuser ) . '" already exists, skipping account creation.</li>';
 244                         } else {
 245                                 if ( $perms != 1 && $perms != 3 ) {
 246                                         print '<li>ERROR: the user "' . htmlspecialchars( $superuser ) . '" cannot create other users. ';
 247                                         print 'Please use a different Postgres user.</li>';
 248                                         dieout( );
 249                                 }
 250                                 print '<li>Creating user <b>' . htmlspecialchars( $wgDBuser ) . '</b>...';
 251                                 $safepass = $this->addQuotes( $wgDBpassword );
 252                                 $SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
 253                                 $this->doQuery( $SQL );
 254                                 print "OK</li>\n";
 255                         }
 256                         // User now exists, check out the database
 257                         if ( $dbName != $wgDBname ) {
 258                                 $SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes( $wgDBname );
 259                                 $rows = $this->numRows( $this->doQuery( $SQL ) );
 260                                 if ( $rows ) {
 261                                         print '<li>Database "' . htmlspecialchars( $wgDBname ) . '" already exists, skipping database creation.</li>';
 262                                 } else {
 263                                         if ( $perms < 1 ) {
 264                                                 print '<li>ERROR: the user "' . htmlspecialchars( $superuser ) . '" cannot create databases. ';
 265                                                 print 'Please use a different Postgres user.</li>';
 266                                                 dieout( );
 267                                         }
 268                                         print '<li>Creating database <b>' . htmlspecialchars( $wgDBname ) . '</b>...';
 269                                         $safename = $this->addIdentifierQuotes( $wgDBname );
 270                                         $SQL = "CREATE DATABASE $safename OWNER $safeuser ";
 271                                         $this->doQuery( $SQL );
 272                                         print "OK</li>\n";
 273                                         // Hopefully tsearch2 and plpgsql are in template1...
 274                                 }
 275
 276                                 // Reconnect to check out tsearch2 rights for this user
 277                                 print '<li>Connecting to "' . htmlspecialchars( $wgDBname ) . '" as superuser "' .
 278                                         htmlspecialchars( $superuser ) . '" to check rights...';
 279
 280                                 $connectVars = array();
 281                                 if ( $this->mServer != false && $this->mServer != '' ) {
 282                                         $connectVars['host'] = $this->mServer;
 283                                 }
 284                                 if ( $this->mPort != false && $this->mPort != '' ) {
 285                                         $connectVars['port'] = $this->mPort;
 286                                 }
 287                                 $connectVars['dbname'] = $wgDBname;
 288                                 $connectVars['user'] = $superuser;
 289                                 $connectVars['password'] = $password;
 290
 291                                 @$this->mConn = pg_connect( $this->makeConnectionString( $connectVars ) );
 292                                 if ( !$this->mConn ) {
 293                                         print "<b>FAILED TO CONNECT!</b></li>";
 294                                         dieout( );
 295                                 }
 296                                 print "OK</li>\n";
 297                         }
 298
 299                         // Setup the schema for this user if needed
 300                         $result = $this->schemaExists( $wgDBmwschema );
 301                         $safeschema = $this->addIdentifierQuotes( $wgDBmwschema );
 302                         if ( !$result ) {
 303                                 print '<li>Creating schema <b>' . htmlspecialchars( $wgDBmwschema ) . '</b> ...';
 304                                 $result = $this->doQuery( "CREATE SCHEMA $safeschema AUTHORIZATION $safeuser" );
 305                                 if ( !$result ) {
 306                                         print "<b>FAILED</b>.</li>\n";
 307                                         dieout( );
 308                                 }
 309                                 print "OK</li>\n";
 310                         } else {
 311                                 print "<li>Schema already exists, explicitly granting rights...\n";
 312                                 $safeschema2 = $this->addQuotes( $wgDBmwschema );
 313                                 $SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
 314                                         "FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
 315                                         "WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
 316                                         "AND p.relkind IN ('r','S','v')\n";
 317                                 $SQL .= "UNION\n";
 318                                 $SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
 319                                         "pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
 320                                         "FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
 321                                         "WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
 322                                 $res = $this->doQuery( $SQL );
 323                                 if ( !$res ) {
 324                                         print "<b>FAILED</b>. Could not set rights for the user.</li>\n";
 325                                         dieout( );
 326                                 }
 327                                 $this->doQuery( "SET search_path = $safeschema" );
 328                                 $rows = $this->numRows( $res );
 329                                 while ( $rows ) {
 330                                         $rows--;
 331                                         $this->doQuery( pg_fetch_result( $res, $rows, 0 ) );
 332                                 }
 333                                 print "OK</li>";
 334                         }
 335
 336                         // Install plpgsql if needed
 337                         $this->setup_plpgsql();
 338
 339                         return true; // Reconnect as regular user
 340
 341                 } // end superuser
 342
 343                 if ( !defined( 'POSTGRES_SEARCHPATH' ) ) {
 344                         // Install plpgsql if needed
 345                         $this->setup_plpgsql();
 346
 347                         // Does the schema already exist? Who owns it?
 348                         $result = $this->schemaExists( $wgDBmwschema );
 349                         if ( !$result ) {
 350                                 print '<li>Creating schema <b>' . htmlspecialchars( $wgDBmwschema ) . '</b> ...';
 351                                 error_reporting( 0 );
 352                                 $safeschema = $this->addIdentifierQuotes( $wgDBmwschema );
 353                                 $result = $this->doQuery( "CREATE SCHEMA $safeschema" );
 354                                 error_reporting( E_ALL );
 355                                 if ( !$result ) {
 356                                         print '<b>FAILED</b>. The user "' . htmlspecialchars( $wgDBuser ) .
 357                                                 '" must be able to access the schema. '.
 358                                                 'You can try making them the owner of the database, or try creating the schema with a '.
 359                                                 'different user, and then grant access to the "' .
 360                                                 htmlspecialchars( $wgDBuser ) . "\" user.</li>\n";
 361                                         dieout( );
 362                                 }
 363                                 print "OK</li>\n";
 364                         } elseif ( $result != $wgDBuser ) {
 365                                 print '<li>Schema "' . htmlspecialchars( $wgDBmwschema ) . '" exists but is not owned by "' .
 366                                         htmlspecialchars( $wgDBuser ) . "\". Not ideal.</li>\n";
 367                         } else {
 368                                 print '<li>Schema "' . htmlspecialchars( $wgDBmwschema ) . '" exists and is owned by "' .
 369                                         htmlspecialchars( $wgDBuser ) . "\". Excellent.</li>\n";
 370                         }
 371
 372                         // Always return GMT time to accomodate the existing integer-based timestamp assumption
 373                         print "<li>Setting the timezone to GMT for user \"" . htmlspecialchars( $wgDBuser ) . '" ...';
 374                         $SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
 375                         $result = pg_query( $this->mConn, $SQL );
 376                         if ( !$result ) {
 377                                 print "<b>FAILED</b>.</li>\n";
 378                                 dieout( );
 379                         }
 380                         print "OK</li>\n";
 381                         // Set for the rest of this session
 382                         $SQL = "SET timezone = 'GMT'";
 383                         $result = pg_query( $this->mConn, $SQL );
 384                         if ( !$result ) {
 385                                 print "<li>Failed to set timezone</li>\n";
 386                                 dieout( );
 387                         }
 388
 389                         print '<li>Setting the datestyle to ISO, YMD for user "' . htmlspecialchars( $wgDBuser ) . '" ...';
 390                         $SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
 391                         $result = pg_query( $this->mConn, $SQL );
 392                         if ( !$result ) {
 393                                 print "<b>FAILED</b>.</li>\n";
 394                                 dieout( );
 395                         }
 396                         print "OK</li>\n";
 397                         // Set for the rest of this session
 398                         $SQL = "SET datestyle = 'ISO, YMD'";
 399                         $result = pg_query( $this->mConn, $SQL );
 400                         if ( !$result ) {
 401                                 print "<li>Failed to set datestyle</li>\n";
 402                                 dieout( );
 403                         }
 404
 405                         // Fix up the search paths if needed
 406                         print '<li>Setting the search path for user "' . htmlspecialchars( $wgDBuser ) . '" ...';
 407                         $path = $this->addIdentifierQuotes( $wgDBmwschema );
 408                         if ( $wgDBts2schema !== $wgDBmwschema ) {
 409                                 $path .= ', '. $this->addIdentifierQuotes( $wgDBts2schema );
 410                         }
 411                         if ( $wgDBmwschema !== 'public' && $wgDBts2schema !== 'public' ) {
 412                                 $path .= ', public';
 413                         }
 414                         $SQL = "ALTER USER $safeuser SET search_path = $path";
 415                         $result = pg_query( $this->mConn, $SQL );
 416                         if ( !$result ) {
 417                                 print "<b>FAILED</b>.</li>\n";
 418                                 dieout( );
 419                         }
 420                         print "OK</li>\n";
 421                         // Set for the rest of this session
 422                         $SQL = "SET search_path = $path";
 423                         $result = pg_query( $this->mConn, $SQL );
 424                         if ( !$result ) {
 425                                 print "<li>Failed to set search_path</li>\n";
 426                                 dieout( );
 427                         }
 428                         define( 'POSTGRES_SEARCHPATH', $path );
 429                 }
 430         }
 431
 432         /**
 433          * Closes a database connection, if it is open
 434          * Returns success, true if already closed
 435          */
 436         function close() {
 437                 $this->mOpened = false;
 438                 if ( $this->mConn ) {
 439                         return pg_close( $this->mConn );
 440                 } else {
 441                         return true;
 442                 }
 443         }
 444
 445         function doQuery( $sql ) {
 446                 if ( function_exists( 'mb_convert_encoding' ) ) {
 447                         $sql = mb_convert_encoding( $sql, 'UTF-8' );
 448                 }
 449                 $this->mLastResult = pg_query( $this->mConn, $sql );
 450                 $this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
 451                 return $this->mLastResult;
 452         }
 453
 454         function queryIgnore( $sql, $fname = 'DatabasePostgres::queryIgnore' ) {
 455                 return $this->query( $sql, $fname, true );
 456         }
 457
 458         function freeResult( $res ) {
 459                 if ( $res instanceof ResultWrapper ) {
 460                         $res = $res->result;
 461                 }
 462                 if ( !@pg_free_result( $res ) ) {
 463                         throw new DBUnexpectedError( $this, "Unable to free Postgres result\n" );
 464                 }
 465         }
 466
 467         function fetchObject( $res ) {
 468                 if ( $res instanceof ResultWrapper ) {
 469                         $res = $res->result;
 470                 }
 471                 @$row = pg_fetch_object( $res );
 472                 # FIXME: HACK HACK HACK HACK debug
 473
 474                 # TODO:
 475                 # hashar : not sure if the following test really trigger if the object
 476                 #          fetching failed.
 477                 if( pg_last_error( $this->mConn ) ) {
 478                         throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 479                 }
 480                 return $row;
 481         }
 482
 483         function fetchRow( $res ) {
 484                 if ( $res instanceof ResultWrapper ) {
 485                         $res = $res->result;
 486                 }
 487                 @$row = pg_fetch_array( $res );
 488                 if( pg_last_error( $this->mConn ) ) {
 489                         throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 490                 }
 491                 return $row;
 492         }
 493
 494         function numRows( $res ) {
 495                 if ( $res instanceof ResultWrapper ) {
 496                         $res = $res->result;
 497                 }
 498                 @$n = pg_num_rows( $res );
 499                 if( pg_last_error( $this->mConn ) ) {
 500                         throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 501                 }
 502                 return $n;
 503         }
 504
 505         function numFields( $res ) {
 506                 if ( $res instanceof ResultWrapper ) {
 507                         $res = $res->result;
 508                 }
 509                 return pg_num_fields( $res );
 510         }
 511
 512         function fieldName( $res, $n ) {
 513                 if ( $res instanceof ResultWrapper ) {
 514                         $res = $res->result;
 515                 }
 516                 return pg_field_name( $res, $n );
 517         }
 518
 519         /**
 520          * This must be called after nextSequenceVal
 521          */
 522         function insertId() {
 523                 return $this->mInsertId;
 524         }
 525
 526         function dataSeek( $res, $row ) {
 527                 if ( $res instanceof ResultWrapper ) {
 528                         $res = $res->result;
 529                 }
 530                 return pg_result_seek( $res, $row );
 531         }
 532
 533         function lastError() {
 534                 if ( $this->mConn ) {
 535                         return pg_last_error();
 536                 } else {
 537                         return 'No database connection';
 538                 }
 539         }
 540         function lastErrno() {
 541                 return pg_last_error() ? 1 : 0;
 542         }
 543
 544         function affectedRows() {
 545                 if ( !is_null( $this->mAffectedRows ) ) {
 546                         // Forced result for simulated queries
 547                         return $this->mAffectedRows;
 548                 }
 549                 if( empty( $this->mLastResult ) ) {
 550                         return 0;
 551                 }
 552                 return pg_affected_rows( $this->mLastResult );
 553         }
 554
 555         /**
 556          * Estimate rows in dataset
 557          * Returns estimated count, based on EXPLAIN output
 558          * This is not necessarily an accurate estimate, so use sparingly
 559          * Returns -1 if count cannot be found
 560          * Takes same arguments as Database::select()
 561          */
 562         function estimateRowCount( $table, $vars = '*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
 563                 $options['EXPLAIN'] = true;
 564                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 565                 $rows = -1;
 566                 if ( $res ) {
 567                         $row = $this->fetchRow( $res );
 568                         $count = array();
 569                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 570                                 $rows = $count[1];
 571                         }
 572                 }
 573                 return $rows;
 574         }
 575
 576         /**
 577          * Returns information about an index
 578          * If errors are explicitly ignored, returns NULL on failure
 579          */
 580         function indexInfo( $table, $index, $fname = 'DatabasePostgres::indexInfo' ) {
 581                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 582                 $res = $this->query( $sql, $fname );
 583                 if ( !$res ) {
 584                         return null;
 585                 }
 586                 foreach ( $res as $row ) {
 587                         if ( $row->indexname == $this->indexName( $index ) ) {
 588                                 return $row;
 589                         }
 590                 }
 591                 return false;
 592         }
 593
 594         function indexUnique( $table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
 595                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 596                         " AND indexdef LIKE 'CREATE UNIQUE%(" .
 597                         $this->strencode( $this->indexName( $index ) ) .
 598                         ")'";
 599                 $res = $this->query( $sql, $fname );
 600                 if ( !$res ) {
 601                         return null;
 602                 }
 603                 foreach ( $res as $row ) {
 604                         return true;
 605                 }
 606                 return false;
 607         }
 608
 609         /**
 610          * INSERT wrapper, inserts an array into a table
 611          *
 612          * $args may be a single associative array, or an array of these with numeric keys,
 613          * for multi-row insert (Postgres version 8.2 and above only).
 614          *
 615          * @param $table   String: Name of the table to insert to.
 616          * @param $args    Array: Items to insert into the table.
 617          * @param $fname   String: Name of the function, for profiling
 618          * @param $options String or Array. Valid options: IGNORE
 619          *
 620          * @return bool Success of insert operation. IGNORE always returns true.
 621          */
 622         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 623                 if ( !count( $args ) ) {
 624                         return true;
 625                 }
 626
 627                 $table = $this->tableName( $table );
 628                 if (! isset( $this->numeric_version ) ) {
 629                         $this->getServerVersion();
 630                 }
 631
 632                 if ( !is_array( $options ) ) {
 633                         $options = array( $options );
 634                 }
 635
 636                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 637                         $multi = true;
 638                         $keys = array_keys( $args[0] );
 639                 } else {
 640                         $multi = false;
 641                         $keys = array_keys( $args );
 642                 }
 643
 644                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 645                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 646
 647                 // If we are not in a transaction, we need to be for savepoint trickery
 648                 $didbegin = 0;
 649                 if ( $ignore ) {
 650                         if ( !$this->mTrxLevel ) {
 651                                 $this->begin();
 652                                 $didbegin = 1;
 653                         }
 654                         $olde = error_reporting( 0 );
 655                         // For future use, we may want to track the number of actual inserts
 656                         // Right now, insert (all writes) simply return true/false
 657                         $numrowsinserted = 0;
 658                 }
 659
 660                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 661
 662                 if ( $multi ) {
 663                         if ( $this->numeric_version >= 8.2 && !$ignore ) {
 664                                 $first = true;
 665                                 foreach ( $args as $row ) {
 666                                         if ( $first ) {
 667                                                 $first = false;
 668                                         } else {
 669                                                 $sql .= ',';
 670                                         }
 671                                         $sql .= '(' . $this->makeList( $row ) . ')';
 672                                 }
 673                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 674                         } else {
 675                                 $res = true;
 676                                 $origsql = $sql;
 677                                 foreach ( $args as $row ) {
 678                                         $tempsql = $origsql;
 679                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 680
 681                                         if ( $ignore ) {
 682                                                 pg_query( $this->mConn, "SAVEPOINT $ignore" );
 683                                         }
 684
 685                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 686
 687                                         if ( $ignore ) {
 688                                                 $bar = pg_last_error();
 689                                                 if ( $bar != false ) {
 690                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 691                                                 } else {
 692                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 693                                                         $numrowsinserted++;
 694                                                 }
 695                                         }
 696
 697                                         // If any of them fail, we fail overall for this function call
 698                                         // Note that this will be ignored if IGNORE is set
 699                                         if ( !$tempres ) {
 700                                                 $res = false;
 701                                         }
 702                                 }
 703                         }
 704                 } else {
 705                         // Not multi, just a lone insert
 706                         if ( $ignore ) {
 707                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 708                         }
 709
 710                         $sql .= '(' . $this->makeList( $args ) . ')';
 711                         $res = (bool)$this->query( $sql, $fname, $ignore );
 712                         if ( $ignore ) {
 713                                 $bar = pg_last_error();
 714                                 if ( $bar != false ) {
 715                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 716                                 } else {
 717                                         pg_query( $this->mConn, "RELEASE $ignore" );
 718                                         $numrowsinserted++;
 719                                 }
 720                         }
 721                 }
 722                 if ( $ignore ) {
 723                         $olde = error_reporting( $olde );
 724                         if ( $didbegin ) {
 725                                 $this->commit();
 726                         }
 727
 728                         // Set the affected row count for the whole operation
 729                         $this->mAffectedRows = $numrowsinserted;
 730
 731                         // IGNORE always returns true
 732                         return true;
 733                 }
 734
 735                 return $res;
 736         }
 737
 738         /**
 739          * INSERT SELECT wrapper
 740          * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
 741          * Source items may be literals rather then field names, but strings should be quoted with Database::addQuotes()
 742          * $conds may be "*" to copy the whole table
 743          * srcTable may be an array of tables.
 744          * @todo FIXME: implement this a little better (seperate select/insert)?
 745          */
 746         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabasePostgres::insertSelect',
 747                 $insertOptions = array(), $selectOptions = array() )
 748         {
 749                 $destTable = $this->tableName( $destTable );
 750
 751                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 752                 $ignore = in_array( 'IGNORE', $insertOptions ) ? 'mw' : '';
 753
 754                 if( is_array( $insertOptions ) ) {
 755                         $insertOptions = implode( ' ', $insertOptions );
 756                 }
 757                 if( !is_array( $selectOptions ) ) {
 758                         $selectOptions = array( $selectOptions );
 759                 }
 760                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 761                 if( is_array( $srcTable ) ) {
 762                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 763                 } else {
 764                         $srcTable = $this->tableName( $srcTable );
 765                 }
 766
 767                 // If we are not in a transaction, we need to be for savepoint trickery
 768                 $didbegin = 0;
 769                 if ( $ignore ) {
 770                         if( !$this->mTrxLevel ) {
 771                                 $this->begin();
 772                                 $didbegin = 1;
 773                         }
 774                         $olde = error_reporting( 0 );
 775                         $numrowsinserted = 0;
 776                         pg_query( $this->mConn, "SAVEPOINT $ignore");
 777                 }
 778
 779                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 780                                 " SELECT $startOpts " . implode( ',', $varMap ) .
 781                                 " FROM $srcTable $useIndex";
 782
 783                 if ( $conds != '*' ) {
 784                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 785                 }
 786
 787                 $sql .= " $tailOpts";
 788
 789                 $res = (bool)$this->query( $sql, $fname, $ignore );
 790                 if( $ignore ) {
 791                         $bar = pg_last_error();
 792                         if( $bar != false ) {
 793                                 pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 794                         } else {
 795                                 pg_query( $this->mConn, "RELEASE $ignore" );
 796                                 $numrowsinserted++;
 797                         }
 798                         $olde = error_reporting( $olde );
 799                         if( $didbegin ) {
 800                                 $this->commit();
 801                         }
 802
 803                         // Set the affected row count for the whole operation
 804                         $this->mAffectedRows = $numrowsinserted;
 805
 806                         // IGNORE always returns true
 807                         return true;
 808                 }
 809
 810                 return $res;
 811         }
 812
 813         function tableName( $name ) {
 814                 # Replace reserved words with better ones
 815                 switch( $name ) {
 816                         case 'user':
 817                                 return 'mwuser';
 818                         case 'text':
 819                                 return 'pagecontent';
 820                         default:
 821                                 return $name;
 822                 }
 823         }
 824
 825         /**
 826          * Return the next in a sequence, save the value for retrieval via insertId()
 827          */
 828         function nextSequenceValue( $seqName ) {
 829                 $safeseq = str_replace( "'", "''", $seqName );
 830                 $res = $this->query( "SELECT nextval('$safeseq')" );
 831                 $row = $this->fetchRow( $res );
 832                 $this->mInsertId = $row[0];
 833                 return $this->mInsertId;
 834         }
 835
 836         /**
 837          * Return the current value of a sequence. Assumes it has been nextval'ed in this session.
 838          */
 839         function currentSequenceValue( $seqName ) {
 840                 $safeseq = str_replace( "'", "''", $seqName );
 841                 $res = $this->query( "SELECT currval('$safeseq')" );
 842                 $row = $this->fetchRow( $res );
 843                 $currval = $row[0];
 844                 return $currval;
 845         }
 846
 847         /**
 848          * REPLACE query wrapper
 849          * Postgres simulates this with a DELETE followed by INSERT
 850          * $row is the row to insert, an associative array
 851          * $uniqueIndexes is an array of indexes. Each element may be either a
 852          * field name or an array of field names
 853          *
 854          * It may be more efficient to leave off unique indexes which are unlikely to collide.
 855          * However if you do this, you run the risk of encountering errors which wouldn't have
 856          * occurred in MySQL
 857          */
 858         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabasePostgres::replace' ) {
 859                 $table = $this->tableName( $table );
 860
 861                 if ( count( $rows ) == 0 ) {
 862                         return;
 863                 }
 864
 865                 # Single row case
 866                 if ( !is_array( reset( $rows ) ) ) {
 867                         $rows = array( $rows );
 868                 }
 869
 870                 foreach( $rows as $row ) {
 871                         # Delete rows which collide
 872                         if ( $uniqueIndexes ) {
 873                                 $sql = "DELETE FROM $table WHERE ";
 874                                 $first = true;
 875                                 foreach ( $uniqueIndexes as $index ) {
 876                                         if ( $first ) {
 877                                                 $first = false;
 878                                                 $sql .= '(';
 879                                         } else {
 880                                                 $sql .= ') OR (';
 881                                         }
 882                                         if ( is_array( $index ) ) {
 883                                                 $first2 = true;
 884                                                 foreach ( $index as $col ) {
 885                                                         if ( $first2 ) {
 886                                                                 $first2 = false;
 887                                                         } else {
 888                                                                 $sql .= ' AND ';
 889                                                         }
 890                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 891                                                 }
 892                                         } else {
 893                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 894                                         }
 895                                 }
 896                                 $sql .= ')';
 897                                 $this->query( $sql, $fname );
 898                         }
 899
 900                         # Now insert the row
 901                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 902                                 $this->makeList( $row, LIST_COMMA ) . ')';
 903                         $this->query( $sql, $fname );
 904                 }
 905         }
 906
 907         # DELETE where the condition is a join
 908         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabasePostgres::deleteJoin' ) {
 909                 if ( !$conds ) {
 910                         throw new DBUnexpectedError( $this, 'DatabasePostgres::deleteJoin() called with empty $conds' );
 911                 }
 912
 913                 $delTable = $this->tableName( $delTable );
 914                 $joinTable = $this->tableName( $joinTable );
 915                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 916                 if ( $conds != '*' ) {
 917                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 918                 }
 919                 $sql .= ')';
 920
 921                 $this->query( $sql, $fname );
 922         }
 923
 924         # Returns the size of a text field, or -1 for "unlimited"
 925         function textFieldSize( $table, $field ) {
 926                 $table = $this->tableName( $table );
 927                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 928                         FROM pg_class c, pg_attribute a, pg_type t
 929                         WHERE relname='$table' AND a.attrelid=c.oid AND
 930                                 a.atttypid=t.oid and a.attname='$field'";
 931                 $res =$this->query( $sql );
 932                 $row = $this->fetchObject( $res );
 933                 if ( $row->ftype == 'varchar' ) {
 934                         $size = $row->size - 4;
 935                 } else {
 936                         $size = $row->size;
 937                 }
 938                 return $size;
 939         }
 940
 941         function limitResult( $sql, $limit, $offset = false ) {
 942                 return "$sql LIMIT $limit " . ( is_numeric( $offset ) ? " OFFSET {$offset} " : '' );
 943         }
 944
 945         function wasDeadlock() {
 946                 return $this->lastErrno() == '40P01';
 947         }
 948
 949         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabasePostgres::duplicateTableStructure' ) {
 950                 return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
 951         }
 952
 953         function timestamp( $ts = 0 ) {
 954                 return wfTimestamp( TS_POSTGRES, $ts );
 955         }
 956
 957         /**
 958          * Return aggregated value function call
 959          */
 960         function aggregateValue( $valuedata, $valuename = 'value' ) {
 961                 return $valuedata;
 962         }
 963
 964         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 965                 // Ignore errors during error handling to avoid infinite recursion
 966                 $ignore = $this->ignoreErrors( true );
 967                 $this->mErrorCount++;
 968
 969                 if ( $ignore || $tempIgnore ) {
 970                         wfDebug( "SQL ERROR (ignored): $error\n" );
 971                         $this->ignoreErrors( $ignore );
 972                 } else {
 973                         $message = "A database error has occurred.  Did you forget to run maintenance/update.php after upgrading?  See: http://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script\n" .
 974                                 "Query: $sql\n" .
 975                                 "Function: $fname\n" .
 976                                 "Error: $errno $error\n";
 977                         throw new DBUnexpectedError( $this, $message );
 978                 }
 979         }
 980
 981         /**
 982          * @return string wikitext of a link to the server software's web site
 983          */
 984         public static function getSoftwareLink() {
 985                 return '[http://www.postgresql.org/ PostgreSQL]';
 986         }
 987
 988         /**
 989          * @return string Version information from the database
 990          */
 991         function getServerVersion() {
 992                 if ( !isset( $this->numeric_version ) ) {
 993                         $versionInfo = pg_version( $this->mConn );
 994                         if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
 995                                 // Old client, abort install
 996                                 $this->numeric_version = '7.3 or earlier';
 997                         } elseif ( isset( $versionInfo['server'] ) ) {
 998                                 // Normal client
 999                                 $this->numeric_version = $versionInfo['server'];
1000                         } else {
1001                                 // Bug 16937: broken pgsql extension from PHP<5.3
1002                                 $this->numeric_version = pg_parameter_status( $this->mConn, 'server_version' );
1003                         }
1004                 }
1005                 return $this->numeric_version;
1006         }
1007
1008         /**
1009          * Query whether a given relation exists (in the given schema, or the
1010          * default mw one if not given)
1011          */
1012         function relationExists( $table, $types, $schema = false ) {
1013                 global $wgDBmwschema;
1014                 if ( !is_array( $types ) ) {
1015                         $types = array( $types );
1016                 }
1017                 if ( !$schema ) {
1018                         $schema = $wgDBmwschema;
1019                 }
1020                 $table = $this->tableName( $table );
1021                 $etable = $this->addQuotes( $table );
1022                 $eschema = $this->addQuotes( $schema );
1023                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1024                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1025                         . "AND c.relkind IN ('" . implode( "','", $types ) . "')";
1026                 $res = $this->query( $SQL );
1027                 $count = $res ? $res->numRows() : 0;
1028                 return (bool)$count;
1029         }
1030
1031         /**
1032          * For backward compatibility, this function checks both tables and
1033          * views.
1034          */
1035         function tableExists( $table, $schema = false ) {
1036                 return $this->relationExists( $table, array( 'r', 'v' ), $schema );
1037         }
1038
1039         function sequenceExists( $sequence, $schema = false ) {
1040                 return $this->relationExists( $sequence, 'S', $schema );
1041         }
1042
1043         function triggerExists( $table, $trigger ) {
1044                 global $wgDBmwschema;
1045
1046                 $q = <<<SQL
1047         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1048                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1049                       AND tgrelid=pg_class.oid
1050                       AND nspname=%s AND relname=%s AND tgname=%s
1051 SQL;
1052                 $res = $this->query(
1053                         sprintf(
1054                                 $q,
1055                                 $this->addQuotes( $wgDBmwschema ),
1056                                 $this->addQuotes( $table ),
1057                                 $this->addQuotes( $trigger )
1058                         )
1059                 );
1060                 if ( !$res ) {
1061                         return null;
1062                 }
1063                 $rows = $res->numRows();
1064                 return $rows;
1065         }
1066
1067         function ruleExists( $table, $rule ) {
1068                 global $wgDBmwschema;
1069                 $exists = $this->selectField( 'pg_rules', 'rulename',
1070                         array(
1071                                 'rulename' => $rule,
1072                                 'tablename' => $table,
1073                                 'schemaname' => $wgDBmwschema
1074                         )
1075                 );
1076                 return $exists === $rule;
1077         }
1078
1079         function constraintExists( $table, $constraint ) {
1080                 global $wgDBmwschema;
1081                 $SQL = sprintf( "SELECT 1 FROM information_schema.table_constraints ".
1082                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1083                         $this->addQuotes( $wgDBmwschema ),
1084                         $this->addQuotes( $table ),
1085                         $this->addQuotes( $constraint )
1086                 );
1087                 $res = $this->query( $SQL );
1088                 if ( !$res ) {
1089                         return null;
1090                 }
1091                 $rows = $res->numRows();
1092                 return $rows;
1093         }
1094
1095         /**
1096          * Query whether a given schema exists. Returns the name of the owner
1097          */
1098         function schemaExists( $schema ) {
1099                 $eschema = str_replace( "'", "''", $schema );
1100                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
1101                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
1102                 $res = $this->query( $SQL );
1103                 if ( $res && $res->numRows() ) {
1104                         $row = $res->fetchObject();
1105                         $owner = $row->rolname;
1106                 } else {
1107                         $owner = false;
1108                 }
1109                 return $owner;
1110         }
1111
1112         function fieldInfo( $table, $field ) {
1113                 return PostgresField::fromText( $this, $table, $field );
1114         }
1115
1116         /**
1117          * pg_field_type() wrapper
1118          */
1119         function fieldType( $res, $index ) {
1120                 if ( $res instanceof ResultWrapper ) {
1121                         $res = $res->result;
1122                 }
1123                 return pg_field_type( $res, $index );
1124         }
1125
1126         /* Not even sure why this is used in the main codebase... */
1127         function limitResultForUpdate( $sql, $num ) {
1128                 return $sql;
1129         }
1130
1131         function encodeBlob( $b ) {
1132                 return new Blob( pg_escape_bytea( $this->mConn, $b ) );
1133         }
1134
1135         function decodeBlob( $b ) {
1136                 if ( $b instanceof Blob ) {
1137                         $b = $b->fetch();
1138                 }
1139                 return pg_unescape_bytea( $b );
1140         }
1141
1142         function strencode( $s ) { # Should not be called by us
1143                 return pg_escape_string( $this->mConn, $s );
1144         }
1145
1146         function addQuotes( $s ) {
1147                 if ( is_null( $s ) ) {
1148                         return 'NULL';
1149                 } elseif ( is_bool( $s ) ) {
1150                         return intval( $s );
1151                 } elseif ( $s instanceof Blob ) {
1152                         return "'" . $s->fetch( $s ) . "'";
1153                 }
1154                 return "'" . pg_escape_string( $this->mConn, $s ) . "'";
1155         }
1156
1157         /**
1158          * Postgres specific version of replaceVars.
1159          * Calls the parent version in Database.php
1160          *
1161          * @private
1162          *
1163          * @param $ins String: SQL string, read from a stream (usually tables.sql)
1164          *
1165          * @return string SQL string
1166          */
1167         protected function replaceVars( $ins ) {
1168                 $ins = parent::replaceVars( $ins );
1169
1170                 if ( $this->numeric_version >= 8.3 ) {
1171                         // Thanks for not providing backwards-compatibility, 8.3
1172                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1173                 }
1174
1175                 if ( $this->numeric_version <= 8.1 ) { // Our minimum version
1176                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
1177                 }
1178
1179                 return $ins;
1180         }
1181
1182         /**
1183          * Various select options
1184          *
1185          * @private
1186          *
1187          * @param $options Array: an associative array of options to be turned into
1188          *              an SQL query, valid keys are listed in the function.
1189          * @return array
1190          */
1191         function makeSelectOptions( $options ) {
1192                 $preLimitTail = $postLimitTail = '';
1193                 $startOpts = $useIndex = '';
1194
1195                 $noKeyOptions = array();
1196                 foreach ( $options as $key => $option ) {
1197                         if ( is_numeric( $key ) ) {
1198                                 $noKeyOptions[$option] = true;
1199                         }
1200                 }
1201
1202                 if ( isset( $options['GROUP BY'] ) ) {
1203                         $preLimitTail .= ' GROUP BY ' . $options['GROUP BY'];
1204                 }
1205                 if ( isset( $options['HAVING'] ) ) {
1206                         $preLimitTail .= " HAVING {$options['HAVING']}";
1207                 }
1208                 if ( isset( $options['ORDER BY'] ) ) {
1209                         $preLimitTail .= ' ORDER BY ' . $options['ORDER BY'];
1210                 }
1211
1212                 //if ( isset( $options['LIMIT'] ) ) {
1213                 //      $tailOpts .= $this->limitResult( '', $options['LIMIT'],
1214                 //              isset( $options['OFFSET'] ) ? $options['OFFSET']
1215                 //              : false );
1216                 //}
1217
1218                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1219                         $postLimitTail .= ' FOR UPDATE';
1220                 }
1221                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) {
1222                         $postLimitTail .= ' LOCK IN SHARE MODE';
1223                 }
1224                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1225                         $startOpts .= 'DISTINCT';
1226                 }
1227
1228                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1229         }
1230
1231         function setFakeMaster( $enabled = true ) {}
1232
1233         function getDBname() {
1234                 return $this->mDBname;
1235         }
1236
1237         function getServer() {
1238                 return $this->mServer;
1239         }
1240
1241         function buildConcat( $stringList ) {
1242                 return implode( ' || ', $stringList );
1243         }
1244
1245         public function getSearchEngine() {
1246                 return 'SearchPostgres';
1247         }
1248 } // end DatabasePostgres class