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