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         /**
  13          * @static
  14          * @param $db DatabaseBase
  15          * @param  $table
  16          * @param  $field
  17          * @return null|PostgresField
  18          */
  19         static function fromText( $db, $table, $field ) {
  20                 global $wgDBmwschema;
  21
  22                 $q = <<<SQL
  23 SELECT
  24  attnotnull, attlen, COALESCE(conname, '') AS conname,
  25  COALESCE(condeferred, 'f') AS deferred,
  26  COALESCE(condeferrable, 'f') AS deferrable,
  27  CASE WHEN typname = 'int2' THEN 'smallint'
  28   WHEN typname = 'int4' THEN 'integer'
  29   WHEN typname = 'int8' THEN 'bigint'
  30   WHEN typname = 'bpchar' THEN 'char'
  31  ELSE typname END AS typname
  32 FROM pg_class c
  33 JOIN pg_namespace n ON (n.oid = c.relnamespace)
  34 JOIN pg_attribute a ON (a.attrelid = c.oid)
  35 JOIN pg_type t ON (t.oid = a.atttypid)
  36 LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
  37 WHERE relkind = 'r'
  38 AND nspname=%s
  39 AND relname=%s
  40 AND attname=%s;
  41 SQL;
  42
  43                 $table = $db->tableName( $table );
  44                 $res = $db->query(
  45                         sprintf( $q,
  46                                 $db->addQuotes( $wgDBmwschema ),
  47                                 $db->addQuotes( $table ),
  48                                 $db->addQuotes( $field )
  49                         )
  50                 );
  51                 $row = $db->fetchObject( $res );
  52                 if ( !$row ) {
  53                         return null;
  54                 }
  55                 $n = new PostgresField;
  56                 $n->type = $row->typname;
  57                 $n->nullable = ( $row->attnotnull == 'f' );
  58                 $n->name = $field;
  59                 $n->tablename = $table;
  60                 $n->max_length = $row->attlen;
  61                 $n->deferrable = ( $row->deferrable == 't' );
  62                 $n->deferred = ( $row->deferred == 't' );
  63                 $n->conname = $row->conname;
  64                 return $n;
  65         }
  66
  67         function name() {
  68                 return $this->name;
  69         }
  70
  71         function tableName() {
  72                 return $this->tablename;
  73         }
  74
  75         function type() {
  76                 return $this->type;
  77         }
  78
  79         function isNullable() {
  80                 return $this->nullable;
  81         }
  82
  83         function maxLength() {
  84                 return $this->max_length;
  85         }
  86
  87         function is_deferrable() {
  88                 return $this->deferrable;
  89         }
  90
  91         function is_deferred() {
  92                 return $this->deferred;
  93         }
  94
  95         function conname() {
  96                 return $this->conname;
  97         }
  98
  99 }
 100
 101 /**
 102  * @ingroup Database
 103  */
 104 class DatabasePostgres extends DatabaseBase {
 105         var $mInsertId = null;
 106         var $mLastResult = null;
 107         var $numeric_version = null;
 108         var $mAffectedRows = null;
 109
 110         function getType() {
 111                 return 'postgres';
 112         }
 113
 114         function cascadingDeletes() {
 115                 return true;
 116         }
 117         function cleanupTriggers() {
 118                 return true;
 119         }
 120         function strictIPs() {
 121                 return true;
 122         }
 123         function realTimestamps() {
 124                 return true;
 125         }
 126         function implicitGroupby() {
 127                 return false;
 128         }
 129         function implicitOrderby() {
 130                 return false;
 131         }
 132         function searchableIPs() {
 133                 return true;
 134         }
 135         function functionalIndexes() {
 136                 return true;
 137         }
 138
 139         function hasConstraint( $name ) {
 140                 global $wgDBmwschema;
 141                 $SQL = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n WHERE c.connamespace = n.oid AND conname = '" .
 142                                 pg_escape_string( $this->mConn, $name ) . "' AND n.nspname = '" . pg_escape_string( $this->mConn, $wgDBmwschema ) ."'";
 143                 $res = $this->doQuery( $SQL );
 144                 return $this->numRows( $res );
 145         }
 146
 147         /**
 148          * Usually aborts on failure
 149          */
 150         function open( $server, $user, $password, $dbName ) {
 151                 # Test for Postgres support, to avoid suppressed fatal error
 152                 if ( !function_exists( 'pg_connect' ) ) {
 153                         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" );
 154                 }
 155
 156                 global $wgDBport;
 157
 158                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 159                         return;
 160                 }
 161
 162                 $this->close();
 163                 $this->mServer = $server;
 164                 $port = $wgDBport;
 165                 $this->mUser = $user;
 166                 $this->mPassword = $password;
 167                 $this->mDBname = $dbName;
 168
 169                 $connectVars = array(
 170                         'dbname' => $dbName,
 171                         'user' => $user,
 172                         'password' => $password
 173                 );
 174                 if ( $server != false && $server != '' ) {
 175                         $connectVars['host'] = $server;
 176                 }
 177                 if ( $port != false && $port != '' ) {
 178                         $connectVars['port'] = $port;
 179                 }
 180                 $connectString = $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW );
 181
 182                 $this->installErrorHandler();
 183                 $this->mConn = pg_connect( $connectString );
 184                 $phpError = $this->restoreErrorHandler();
 185
 186                 if ( !$this->mConn ) {
 187                         wfDebug( "DB connection error\n" );
 188                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 189                         wfDebug( $this->lastError() . "\n" );
 190                         throw new DBConnectionError( $this, $phpError );
 191                 }
 192
 193                 $this->mOpened = true;
 194
 195                 global $wgCommandLineMode;
 196                 # If called from the command-line (e.g. importDump), only show errors
 197                 if ( $wgCommandLineMode ) {
 198                         $this->doQuery( "SET client_min_messages = 'ERROR'" );
 199                 }
 200
 201                 $this->query( "SET client_encoding='UTF8'", __METHOD__ );
 202                 $this->query( "SET datestyle = 'ISO, YMD'", __METHOD__ );
 203                 $this->query( "SET timezone = 'GMT'", __METHOD__ );
 204
 205                 global $wgDBmwschema;
 206                 if ( $this->schemaExists( $wgDBmwschema ) ) {
 207                         $safeschema = $this->addIdentifierQuotes( $wgDBmwschema );
 208                         $this->doQuery( "SET search_path = $safeschema" );
 209                 } else {
 210                         $this->doQuery( "SET search_path = public" );
 211                 }
 212
 213                 return $this->mConn;
 214         }
 215
 216         /**
 217          * Postgres doesn't support selectDB in the same way MySQL does. So if the
 218          * DB name doesn't match the open connection, open a new one
 219          * @return
 220          */
 221         function selectDB( $db ) {
 222                 return (bool)$this->open( $this->mServer, $this->mUser, $this->mPassword, $db );
 223         }
 224
 225         function makeConnectionString( $vars ) {
 226                 $s = '';
 227                 foreach ( $vars as $name => $value ) {
 228                         $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
 229                 }
 230                 return $s;
 231         }
 232
 233         /**
 234          * Closes a database connection, if it is open
 235          * Returns success, true if already closed
 236          */
 237         function close() {
 238                 $this->mOpened = false;
 239                 if ( $this->mConn ) {
 240                         return pg_close( $this->mConn );
 241                 } else {
 242                         return true;
 243                 }
 244         }
 245
 246         function doQuery( $sql ) {
 247                 if ( function_exists( 'mb_convert_encoding' ) ) {
 248                         $sql = mb_convert_encoding( $sql, 'UTF-8' );
 249                 }
 250                 $this->mLastResult = pg_query( $this->mConn, $sql );
 251                 $this->mAffectedRows = null; // use pg_affected_rows(mLastResult)
 252                 return $this->mLastResult;
 253         }
 254
 255         function queryIgnore( $sql, $fname = 'DatabasePostgres::queryIgnore' ) {
 256                 return $this->query( $sql, $fname, true );
 257         }
 258
 259         function freeResult( $res ) {
 260                 if ( $res instanceof ResultWrapper ) {
 261                         $res = $res->result;
 262                 }
 263                 if ( !@pg_free_result( $res ) ) {
 264                         throw new DBUnexpectedError( $this, "Unable to free Postgres result\n" );
 265                 }
 266         }
 267
 268         function fetchObject( $res ) {
 269                 if ( $res instanceof ResultWrapper ) {
 270                         $res = $res->result;
 271                 }
 272                 @$row = pg_fetch_object( $res );
 273                 # FIXME: HACK HACK HACK HACK debug
 274
 275                 # TODO:
 276                 # hashar : not sure if the following test really trigger if the object
 277                 #          fetching failed.
 278                 if( pg_last_error( $this->mConn ) ) {
 279                         throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 280                 }
 281                 return $row;
 282         }
 283
 284         function fetchRow( $res ) {
 285                 if ( $res instanceof ResultWrapper ) {
 286                         $res = $res->result;
 287                 }
 288                 @$row = pg_fetch_array( $res );
 289                 if( pg_last_error( $this->mConn ) ) {
 290                         throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 291                 }
 292                 return $row;
 293         }
 294
 295         function numRows( $res ) {
 296                 if ( $res instanceof ResultWrapper ) {
 297                         $res = $res->result;
 298                 }
 299                 @$n = pg_num_rows( $res );
 300                 if( pg_last_error( $this->mConn ) ) {
 301                         throw new DBUnexpectedError( $this, 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn ) ) );
 302                 }
 303                 return $n;
 304         }
 305
 306         function numFields( $res ) {
 307                 if ( $res instanceof ResultWrapper ) {
 308                         $res = $res->result;
 309                 }
 310                 return pg_num_fields( $res );
 311         }
 312
 313         function fieldName( $res, $n ) {
 314                 if ( $res instanceof ResultWrapper ) {
 315                         $res = $res->result;
 316                 }
 317                 return pg_field_name( $res, $n );
 318         }
 319
 320         /**
 321          * This must be called after nextSequenceVal
 322          */
 323         function insertId() {
 324                 return $this->mInsertId;
 325         }
 326
 327         function dataSeek( $res, $row ) {
 328                 if ( $res instanceof ResultWrapper ) {
 329                         $res = $res->result;
 330                 }
 331                 return pg_result_seek( $res, $row );
 332         }
 333
 334         function lastError() {
 335                 if ( $this->mConn ) {
 336                         return pg_last_error();
 337                 } else {
 338                         return 'No database connection';
 339                 }
 340         }
 341         function lastErrno() {
 342                 return pg_last_error() ? 1 : 0;
 343         }
 344
 345         function affectedRows() {
 346                 if ( !is_null( $this->mAffectedRows ) ) {
 347                         // Forced result for simulated queries
 348                         return $this->mAffectedRows;
 349                 }
 350                 if( empty( $this->mLastResult ) ) {
 351                         return 0;
 352                 }
 353                 return pg_affected_rows( $this->mLastResult );
 354         }
 355
 356         /**
 357          * Estimate rows in dataset
 358          * Returns estimated count, based on EXPLAIN output
 359          * This is not necessarily an accurate estimate, so use sparingly
 360          * Returns -1 if count cannot be found
 361          * Takes same arguments as Database::select()
 362          */
 363         function estimateRowCount( $table, $vars = '*', $conds='', $fname = 'DatabasePostgres::estimateRowCount', $options = array() ) {
 364                 $options['EXPLAIN'] = true;
 365                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 366                 $rows = -1;
 367                 if ( $res ) {
 368                         $row = $this->fetchRow( $res );
 369                         $count = array();
 370                         if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
 371                                 $rows = $count[1];
 372                         }
 373                 }
 374                 return $rows;
 375         }
 376
 377         /**
 378          * Returns information about an index
 379          * If errors are explicitly ignored, returns NULL on failure
 380          */
 381         function indexInfo( $table, $index, $fname = 'DatabasePostgres::indexInfo' ) {
 382                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
 383                 $res = $this->query( $sql, $fname );
 384                 if ( !$res ) {
 385                         return null;
 386                 }
 387                 foreach ( $res as $row ) {
 388                         if ( $row->indexname == $this->indexName( $index ) ) {
 389                                 return $row;
 390                         }
 391                 }
 392                 return false;
 393         }
 394
 395         function indexUnique( $table, $index, $fname = 'DatabasePostgres::indexUnique' ) {
 396                 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
 397                         " AND indexdef LIKE 'CREATE UNIQUE%(" .
 398                         $this->strencode( $this->indexName( $index ) ) .
 399                         ")'";
 400                 $res = $this->query( $sql, $fname );
 401                 if ( !$res ) {
 402                         return null;
 403                 }
 404                 foreach ( $res as $row ) {
 405                         return true;
 406                 }
 407                 return false;
 408         }
 409
 410         /**
 411          * INSERT wrapper, inserts an array into a table
 412          *
 413          * $args may be a single associative array, or an array of these with numeric keys,
 414          * for multi-row insert (Postgres version 8.2 and above only).
 415          *
 416          * @param $table   String: Name of the table to insert to.
 417          * @param $args    Array: Items to insert into the table.
 418          * @param $fname   String: Name of the function, for profiling
 419          * @param $options String or Array. Valid options: IGNORE
 420          *
 421          * @return bool Success of insert operation. IGNORE always returns true.
 422          */
 423         function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
 424                 if ( !count( $args ) ) {
 425                         return true;
 426                 }
 427
 428                 $table = $this->tableName( $table );
 429                 if (! isset( $this->numeric_version ) ) {
 430                         $this->getServerVersion();
 431                 }
 432
 433                 if ( !is_array( $options ) ) {
 434                         $options = array( $options );
 435                 }
 436
 437                 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
 438                         $multi = true;
 439                         $keys = array_keys( $args[0] );
 440                 } else {
 441                         $multi = false;
 442                         $keys = array_keys( $args );
 443                 }
 444
 445                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 446                 $ignore = in_array( 'IGNORE', $options ) ? 'mw' : '';
 447
 448                 // If we are not in a transaction, we need to be for savepoint trickery
 449                 $didbegin = 0;
 450                 if ( $ignore ) {
 451                         if ( !$this->mTrxLevel ) {
 452                                 $this->begin();
 453                                 $didbegin = 1;
 454                         }
 455                         $olde = error_reporting( 0 );
 456                         // For future use, we may want to track the number of actual inserts
 457                         // Right now, insert (all writes) simply return true/false
 458                         $numrowsinserted = 0;
 459                 }
 460
 461                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
 462
 463                 if ( $multi ) {
 464                         if ( $this->numeric_version >= 8.2 && !$ignore ) {
 465                                 $first = true;
 466                                 foreach ( $args as $row ) {
 467                                         if ( $first ) {
 468                                                 $first = false;
 469                                         } else {
 470                                                 $sql .= ',';
 471                                         }
 472                                         $sql .= '(' . $this->makeList( $row ) . ')';
 473                                 }
 474                                 $res = (bool)$this->query( $sql, $fname, $ignore );
 475                         } else {
 476                                 $res = true;
 477                                 $origsql = $sql;
 478                                 foreach ( $args as $row ) {
 479                                         $tempsql = $origsql;
 480                                         $tempsql .= '(' . $this->makeList( $row ) . ')';
 481
 482                                         if ( $ignore ) {
 483                                                 pg_query( $this->mConn, "SAVEPOINT $ignore" );
 484                                         }
 485
 486                                         $tempres = (bool)$this->query( $tempsql, $fname, $ignore );
 487
 488                                         if ( $ignore ) {
 489                                                 $bar = pg_last_error();
 490                                                 if ( $bar != false ) {
 491                                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 492                                                 } else {
 493                                                         pg_query( $this->mConn, "RELEASE $ignore" );
 494                                                         $numrowsinserted++;
 495                                                 }
 496                                         }
 497
 498                                         // If any of them fail, we fail overall for this function call
 499                                         // Note that this will be ignored if IGNORE is set
 500                                         if ( !$tempres ) {
 501                                                 $res = false;
 502                                         }
 503                                 }
 504                         }
 505                 } else {
 506                         // Not multi, just a lone insert
 507                         if ( $ignore ) {
 508                                 pg_query($this->mConn, "SAVEPOINT $ignore");
 509                         }
 510
 511                         $sql .= '(' . $this->makeList( $args ) . ')';
 512                         $res = (bool)$this->query( $sql, $fname, $ignore );
 513                         if ( $ignore ) {
 514                                 $bar = pg_last_error();
 515                                 if ( $bar != false ) {
 516                                         pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 517                                 } else {
 518                                         pg_query( $this->mConn, "RELEASE $ignore" );
 519                                         $numrowsinserted++;
 520                                 }
 521                         }
 522                 }
 523                 if ( $ignore ) {
 524                         $olde = error_reporting( $olde );
 525                         if ( $didbegin ) {
 526                                 $this->commit();
 527                         }
 528
 529                         // Set the affected row count for the whole operation
 530                         $this->mAffectedRows = $numrowsinserted;
 531
 532                         // IGNORE always returns true
 533                         return true;
 534                 }
 535
 536                 return $res;
 537         }
 538
 539         /**
 540          * INSERT SELECT wrapper
 541          * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
 542          * Source items may be literals rather then field names, but strings should be quoted with Database::addQuotes()
 543          * $conds may be "*" to copy the whole table
 544          * srcTable may be an array of tables.
 545          * @todo FIXME: implement this a little better (seperate select/insert)?
 546          */
 547         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabasePostgres::insertSelect',
 548                 $insertOptions = array(), $selectOptions = array() )
 549         {
 550                 $destTable = $this->tableName( $destTable );
 551
 552                 // If IGNORE is set, we use savepoints to emulate mysql's behavior
 553                 $ignore = in_array( 'IGNORE', $insertOptions ) ? 'mw' : '';
 554
 555                 if( is_array( $insertOptions ) ) {
 556                         $insertOptions = implode( ' ', $insertOptions );
 557                 }
 558                 if( !is_array( $selectOptions ) ) {
 559                         $selectOptions = array( $selectOptions );
 560                 }
 561                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 562                 if( is_array( $srcTable ) ) {
 563                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 564                 } else {
 565                         $srcTable = $this->tableName( $srcTable );
 566                 }
 567
 568                 // If we are not in a transaction, we need to be for savepoint trickery
 569                 $didbegin = 0;
 570                 if ( $ignore ) {
 571                         if( !$this->mTrxLevel ) {
 572                                 $this->begin();
 573                                 $didbegin = 1;
 574                         }
 575                         $olde = error_reporting( 0 );
 576                         $numrowsinserted = 0;
 577                         pg_query( $this->mConn, "SAVEPOINT $ignore");
 578                 }
 579
 580                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 581                                 " SELECT $startOpts " . implode( ',', $varMap ) .
 582                                 " FROM $srcTable $useIndex";
 583
 584                 if ( $conds != '*' ) {
 585                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 586                 }
 587
 588                 $sql .= " $tailOpts";
 589
 590                 $res = (bool)$this->query( $sql, $fname, $ignore );
 591                 if( $ignore ) {
 592                         $bar = pg_last_error();
 593                         if( $bar != false ) {
 594                                 pg_query( $this->mConn, "ROLLBACK TO $ignore" );
 595                         } else {
 596                                 pg_query( $this->mConn, "RELEASE $ignore" );
 597                                 $numrowsinserted++;
 598                         }
 599                         $olde = error_reporting( $olde );
 600                         if( $didbegin ) {
 601                                 $this->commit();
 602                         }
 603
 604                         // Set the affected row count for the whole operation
 605                         $this->mAffectedRows = $numrowsinserted;
 606
 607                         // IGNORE always returns true
 608                         return true;
 609                 }
 610
 611                 return $res;
 612         }
 613
 614         function tableName( $name ) {
 615                 # Replace reserved words with better ones
 616                 switch( $name ) {
 617                         case 'user':
 618                                 return 'mwuser';
 619                         case 'text':
 620                                 return 'pagecontent';
 621                         default:
 622                                 return $name;
 623                 }
 624         }
 625
 626         /**
 627          * Return the next in a sequence, save the value for retrieval via insertId()
 628          */
 629         function nextSequenceValue( $seqName ) {
 630                 $safeseq = str_replace( "'", "''", $seqName );
 631                 $res = $this->query( "SELECT nextval('$safeseq')" );
 632                 $row = $this->fetchRow( $res );
 633                 $this->mInsertId = $row[0];
 634                 return $this->mInsertId;
 635         }
 636
 637         /**
 638          * Return the current value of a sequence. Assumes it has been nextval'ed in this session.
 639          */
 640         function currentSequenceValue( $seqName ) {
 641                 $safeseq = str_replace( "'", "''", $seqName );
 642                 $res = $this->query( "SELECT currval('$safeseq')" );
 643                 $row = $this->fetchRow( $res );
 644                 $currval = $row[0];
 645                 return $currval;
 646         }
 647
 648         /**
 649          * REPLACE query wrapper
 650          * Postgres simulates this with a DELETE followed by INSERT
 651          * $row is the row to insert, an associative array
 652          * $uniqueIndexes is an array of indexes. Each element may be either a
 653          * field name or an array of field names
 654          *
 655          * It may be more efficient to leave off unique indexes which are unlikely to collide.
 656          * However if you do this, you run the risk of encountering errors which wouldn't have
 657          * occurred in MySQL
 658          */
 659         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabasePostgres::replace' ) {
 660                 $table = $this->tableName( $table );
 661
 662                 if ( count( $rows ) == 0 ) {
 663                         return;
 664                 }
 665
 666                 # Single row case
 667                 if ( !is_array( reset( $rows ) ) ) {
 668                         $rows = array( $rows );
 669                 }
 670
 671                 foreach( $rows as $row ) {
 672                         # Delete rows which collide
 673                         if ( $uniqueIndexes ) {
 674                                 $sql = "DELETE FROM $table WHERE ";
 675                                 $first = true;
 676                                 foreach ( $uniqueIndexes as $index ) {
 677                                         if ( $first ) {
 678                                                 $first = false;
 679                                                 $sql .= '(';
 680                                         } else {
 681                                                 $sql .= ') OR (';
 682                                         }
 683                                         if ( is_array( $index ) ) {
 684                                                 $first2 = true;
 685                                                 foreach ( $index as $col ) {
 686                                                         if ( $first2 ) {
 687                                                                 $first2 = false;
 688                                                         } else {
 689                                                                 $sql .= ' AND ';
 690                                                         }
 691                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 692                                                 }
 693                                         } else {
 694                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 695                                         }
 696                                 }
 697                                 $sql .= ')';
 698                                 $this->query( $sql, $fname );
 699                         }
 700
 701                         # Now insert the row
 702                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 703                                 $this->makeList( $row, LIST_COMMA ) . ')';
 704                         $this->query( $sql, $fname );
 705                 }
 706         }
 707
 708         # DELETE where the condition is a join
 709         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabasePostgres::deleteJoin' ) {
 710                 if ( !$conds ) {
 711                         throw new DBUnexpectedError( $this, 'DatabasePostgres::deleteJoin() called with empty $conds' );
 712                 }
 713
 714                 $delTable = $this->tableName( $delTable );
 715                 $joinTable = $this->tableName( $joinTable );
 716                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 717                 if ( $conds != '*' ) {
 718                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 719                 }
 720                 $sql .= ')';
 721
 722                 $this->query( $sql, $fname );
 723         }
 724
 725         # Returns the size of a text field, or -1 for "unlimited"
 726         function textFieldSize( $table, $field ) {
 727                 $table = $this->tableName( $table );
 728                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 729                         FROM pg_class c, pg_attribute a, pg_type t
 730                         WHERE relname='$table' AND a.attrelid=c.oid AND
 731                                 a.atttypid=t.oid and a.attname='$field'";
 732                 $res =$this->query( $sql );
 733                 $row = $this->fetchObject( $res );
 734                 if ( $row->ftype == 'varchar' ) {
 735                         $size = $row->size - 4;
 736                 } else {
 737                         $size = $row->size;
 738                 }
 739                 return $size;
 740         }
 741
 742         function limitResult( $sql, $limit, $offset = false ) {
 743                 return "$sql LIMIT $limit " . ( is_numeric( $offset ) ? " OFFSET {$offset} " : '' );
 744         }
 745
 746         function wasDeadlock() {
 747                 return $this->lastErrno() == '40P01';
 748         }
 749
 750         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabasePostgres::duplicateTableStructure' ) {
 751                 return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName (LIKE $oldName INCLUDING DEFAULTS)", $fname );
 752         }
 753
 754         function timestamp( $ts = 0 ) {
 755                 return wfTimestamp( TS_POSTGRES, $ts );
 756         }
 757
 758         /**
 759          * Return aggregated value function call
 760          */
 761         function aggregateValue( $valuedata, $valuename = 'value' ) {
 762                 return $valuedata;
 763         }
 764
 765         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 766                 // Ignore errors during error handling to avoid infinite recursion
 767                 $ignore = $this->ignoreErrors( true );
 768                 $this->mErrorCount++;
 769
 770                 if ( $ignore || $tempIgnore ) {
 771                         wfDebug( "SQL ERROR (ignored): $error\n" );
 772                         $this->ignoreErrors( $ignore );
 773                 } else {
 774                         $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" .
 775                                 "Query: $sql\n" .
 776                                 "Function: $fname\n" .
 777                                 "Error: $errno $error\n";
 778                         throw new DBUnexpectedError( $this, $message );
 779                 }
 780         }
 781
 782         /**
 783          * @return string wikitext of a link to the server software's web site
 784          */
 785         public static function getSoftwareLink() {
 786                 return '[http://www.postgresql.org/ PostgreSQL]';
 787         }
 788
 789         /**
 790          * @return string Version information from the database
 791          */
 792         function getServerVersion() {
 793                 if ( !isset( $this->numeric_version ) ) {
 794                         $versionInfo = pg_version( $this->mConn );
 795                         if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
 796                                 // Old client, abort install
 797                                 $this->numeric_version = '7.3 or earlier';
 798                         } elseif ( isset( $versionInfo['server'] ) ) {
 799                                 // Normal client
 800                                 $this->numeric_version = $versionInfo['server'];
 801                         } else {
 802                                 // Bug 16937: broken pgsql extension from PHP<5.3
 803                                 $this->numeric_version = pg_parameter_status( $this->mConn, 'server_version' );
 804                         }
 805                 }
 806                 return $this->numeric_version;
 807         }
 808
 809         /**
 810          * Query whether a given relation exists (in the given schema, or the
 811          * default mw one if not given)
 812          */
 813         function relationExists( $table, $types, $schema = false ) {
 814                 global $wgDBmwschema;
 815                 if ( !is_array( $types ) ) {
 816                         $types = array( $types );
 817                 }
 818                 if ( !$schema ) {
 819                         $schema = $wgDBmwschema;
 820                 }
 821                 $table = $this->tableName( $table );
 822                 $etable = $this->addQuotes( $table );
 823                 $eschema = $this->addQuotes( $schema );
 824                 $SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
 825                         . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
 826                         . "AND c.relkind IN ('" . implode( "','", $types ) . "')";
 827                 $res = $this->query( $SQL );
 828                 $count = $res ? $res->numRows() : 0;
 829                 return (bool)$count;
 830         }
 831
 832         /**
 833          * For backward compatibility, this function checks both tables and
 834          * views.
 835          */
 836         function tableExists( $table, $schema = false ) {
 837                 return $this->relationExists( $table, array( 'r', 'v' ), $schema );
 838         }
 839
 840         function sequenceExists( $sequence, $schema = false ) {
 841                 return $this->relationExists( $sequence, 'S', $schema );
 842         }
 843
 844         function triggerExists( $table, $trigger ) {
 845                 global $wgDBmwschema;
 846
 847                 $q = <<<SQL
 848         SELECT 1 FROM pg_class, pg_namespace, pg_trigger
 849                 WHERE relnamespace=pg_namespace.oid AND relkind='r'
 850                       AND tgrelid=pg_class.oid
 851                       AND nspname=%s AND relname=%s AND tgname=%s
 852 SQL;
 853                 $res = $this->query(
 854                         sprintf(
 855                                 $q,
 856                                 $this->addQuotes( $wgDBmwschema ),
 857                                 $this->addQuotes( $table ),
 858                                 $this->addQuotes( $trigger )
 859                         )
 860                 );
 861                 if ( !$res ) {
 862                         return null;
 863                 }
 864                 $rows = $res->numRows();
 865                 return $rows;
 866         }
 867
 868         function ruleExists( $table, $rule ) {
 869                 global $wgDBmwschema;
 870                 $exists = $this->selectField( 'pg_rules', 'rulename',
 871                         array(
 872                                 'rulename' => $rule,
 873                                 'tablename' => $table,
 874                                 'schemaname' => $wgDBmwschema
 875                         )
 876                 );
 877                 return $exists === $rule;
 878         }
 879
 880         function constraintExists( $table, $constraint ) {
 881                 global $wgDBmwschema;
 882                 $SQL = sprintf( "SELECT 1 FROM information_schema.table_constraints ".
 883                            "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
 884                         $this->addQuotes( $wgDBmwschema ),
 885                         $this->addQuotes( $table ),
 886                         $this->addQuotes( $constraint )
 887                 );
 888                 $res = $this->query( $SQL );
 889                 if ( !$res ) {
 890                         return null;
 891                 }
 892                 $rows = $res->numRows();
 893                 return $rows;
 894         }
 895
 896         /**
 897          * Query whether a given schema exists. Returns the name of the owner
 898          */
 899         function schemaExists( $schema ) {
 900                 $eschema = str_replace( "'", "''", $schema );
 901                 $SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
 902                                 ."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
 903                 $res = $this->query( $SQL );
 904                 if ( $res && $res->numRows() ) {
 905                         $row = $res->fetchObject();
 906                         $owner = $row->rolname;
 907                 } else {
 908                         $owner = false;
 909                 }
 910                 return $owner;
 911         }
 912
 913         function fieldInfo( $table, $field ) {
 914                 return PostgresField::fromText( $this, $table, $field );
 915         }
 916
 917         /**
 918          * pg_field_type() wrapper
 919          */
 920         function fieldType( $res, $index ) {
 921                 if ( $res instanceof ResultWrapper ) {
 922                         $res = $res->result;
 923                 }
 924                 return pg_field_type( $res, $index );
 925         }
 926
 927         /* Not even sure why this is used in the main codebase... */
 928         function limitResultForUpdate( $sql, $num ) {
 929                 return $sql;
 930         }
 931
 932         function encodeBlob( $b ) {
 933                 return new Blob( pg_escape_bytea( $this->mConn, $b ) );
 934         }
 935
 936         function decodeBlob( $b ) {
 937                 if ( $b instanceof Blob ) {
 938                         $b = $b->fetch();
 939                 }
 940                 return pg_unescape_bytea( $b );
 941         }
 942
 943         function strencode( $s ) { # Should not be called by us
 944                 return pg_escape_string( $this->mConn, $s );
 945         }
 946
 947         function addQuotes( $s ) {
 948                 if ( is_null( $s ) ) {
 949                         return 'NULL';
 950                 } elseif ( is_bool( $s ) ) {
 951                         return intval( $s );
 952                 } elseif ( $s instanceof Blob ) {
 953                         return "'" . $s->fetch( $s ) . "'";
 954                 }
 955                 return "'" . pg_escape_string( $this->mConn, $s ) . "'";
 956         }
 957
 958         /**
 959          * Postgres specific version of replaceVars.
 960          * Calls the parent version in Database.php
 961          *
 962          * @private
 963          *
 964          * @param $ins String: SQL string, read from a stream (usually tables.sql)
 965          *
 966          * @return string SQL string
 967          */
 968         protected function replaceVars( $ins ) {
 969                 $ins = parent::replaceVars( $ins );
 970
 971                 if ( $this->numeric_version >= 8.3 ) {
 972                         // Thanks for not providing backwards-compatibility, 8.3
 973                         $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
 974                 }
 975
 976                 if ( $this->numeric_version <= 8.1 ) { // Our minimum version
 977                         $ins = str_replace( 'USING gin', 'USING gist', $ins );
 978                 }
 979
 980                 return $ins;
 981         }
 982
 983         /**
 984          * Various select options
 985          *
 986          * @private
 987          *
 988          * @param $options Array: an associative array of options to be turned into
 989          *              an SQL query, valid keys are listed in the function.
 990          * @return array
 991          */
 992         function makeSelectOptions( $options ) {
 993                 $preLimitTail = $postLimitTail = '';
 994                 $startOpts = $useIndex = '';
 995
 996                 $noKeyOptions = array();
 997                 foreach ( $options as $key => $option ) {
 998                         if ( is_numeric( $key ) ) {
 999                                 $noKeyOptions[$option] = true;
1000                         }
1001                 }
1002
1003                 if ( isset( $options['GROUP BY'] ) ) {
1004                         $preLimitTail .= ' GROUP BY ' . $options['GROUP BY'];
1005                 }
1006                 if ( isset( $options['HAVING'] ) ) {
1007                         $preLimitTail .= " HAVING {$options['HAVING']}";
1008                 }
1009                 if ( isset( $options['ORDER BY'] ) ) {
1010                         $preLimitTail .= ' ORDER BY ' . $options['ORDER BY'];
1011                 }
1012
1013                 //if ( isset( $options['LIMIT'] ) ) {
1014                 //      $tailOpts .= $this->limitResult( '', $options['LIMIT'],
1015                 //              isset( $options['OFFSET'] ) ? $options['OFFSET']
1016                 //              : false );
1017                 //}
1018
1019                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1020                         $postLimitTail .= ' FOR UPDATE';
1021                 }
1022                 if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) {
1023                         $postLimitTail .= ' LOCK IN SHARE MODE';
1024                 }
1025                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1026                         $startOpts .= 'DISTINCT';
1027                 }
1028
1029                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1030         }
1031
1032         function setFakeMaster( $enabled = true ) {}
1033
1034         function getDBname() {
1035                 return $this->mDBname;
1036         }
1037
1038         function getServer() {
1039                 return $this->mServer;
1040         }
1041
1042         function buildConcat( $stringList ) {
1043                 return implode( ' || ', $stringList );
1044         }
1045
1046         public function getSearchEngine() {
1047                 return 'SearchPostgres';
1048         }
1049 } // end DatabasePostgres class