3 * This is the Postgres database abstraction layer.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
24 class PostgresField
implements Field
{
25 private $name, $tablename, $type, $nullable, $max_length, $deferred, $deferrable, $conname,
26 $has_default, $default;
29 * @param DatabaseBase $db
30 * @param string $table
31 * @param string $field
32 * @return null|PostgresField
34 static function fromText( $db, $table, $field ) {
37 attnotnull, attlen, conname AS conname,
40 COALESCE(condeferred, 'f') AS deferred,
41 COALESCE(condeferrable, 'f') AS deferrable,
42 CASE WHEN typname = 'int2' THEN 'smallint'
43 WHEN typname = 'int4' THEN 'integer'
44 WHEN typname = 'int8' THEN 'bigint'
45 WHEN typname = 'bpchar' THEN 'char'
46 ELSE typname END AS typname
48 JOIN pg_namespace n ON (n.oid = c.relnamespace)
49 JOIN pg_attribute a ON (a.attrelid = c.oid)
50 JOIN pg_type t ON (t.oid = a.atttypid)
51 LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
52 LEFT JOIN pg_attrdef d on c.oid=d.adrelid and a.attnum=d.adnum
59 $table = $db->tableName( $table, 'raw' );
62 $db->addQuotes( $db->getCoreSchema() ),
63 $db->addQuotes( $table ),
64 $db->addQuotes( $field )
67 $row = $db->fetchObject( $res );
71 $n = new PostgresField
;
72 $n->type
= $row->typname
;
73 $n->nullable
= ( $row->attnotnull
== 'f' );
75 $n->tablename
= $table;
76 $n->max_length
= $row->attlen
;
77 $n->deferrable
= ( $row->deferrable
== 't' );
78 $n->deferred
= ( $row->deferred
== 't' );
79 $n->conname
= $row->conname
;
80 $n->has_default
= ( $row->atthasdef
=== 't' );
81 $n->default = $row->adsrc
;
90 function tableName() {
91 return $this->tablename
;
98 function isNullable() {
99 return $this->nullable
;
102 function maxLength() {
103 return $this->max_length
;
106 function is_deferrable() {
107 return $this->deferrable
;
110 function is_deferred() {
111 return $this->deferred
;
115 return $this->conname
;
121 function defaultValue() {
122 if ( $this->has_default
) {
123 return $this->default;
131 * Used to debug transaction processing
132 * Only used if $wgDebugDBTransactions is true
137 class PostgresTransactionState
{
138 private static $WATCHED = array(
140 "desc" => "%s: Connection state changed from %s -> %s\n",
142 PGSQL_CONNECTION_OK
=> "OK",
143 PGSQL_CONNECTION_BAD
=> "BAD"
147 "desc" => "%s: Transaction state changed from %s -> %s\n",
149 PGSQL_TRANSACTION_IDLE
=> "IDLE",
150 PGSQL_TRANSACTION_ACTIVE
=> "ACTIVE",
151 PGSQL_TRANSACTION_INTRANS
=> "TRANS",
152 PGSQL_TRANSACTION_INERROR
=> "ERROR",
153 PGSQL_TRANSACTION_UNKNOWN
=> "UNKNOWN"
162 private $mCurrentState;
164 public function __construct( $conn ) {
165 $this->mConn
= $conn;
167 $this->mCurrentState
= $this->mNewState
;
170 public function update() {
171 $this->mNewState
= array(
172 pg_connection_status( $this->mConn
),
173 pg_transaction_status( $this->mConn
)
177 public function check() {
178 global $wgDebugDBTransactions;
180 if ( $wgDebugDBTransactions ) {
181 if ( $this->mCurrentState
!== $this->mNewState
) {
182 $old = reset( $this->mCurrentState
);
183 $new = reset( $this->mNewState
);
184 foreach ( self
::$WATCHED as $watched ) {
185 if ( $old !== $new ) {
186 $this->log_changed( $old, $new, $watched );
188 $old = next( $this->mCurrentState
);
189 $new = next( $this->mNewState
);
193 $this->mCurrentState
= $this->mNewState
;
196 protected function describe_changed( $status, $desc_table ) {
197 if ( isset( $desc_table[$status] ) ) {
198 return $desc_table[$status];
200 return "STATUS " . $status;
204 protected function log_changed( $old, $new, $watched ) {
205 wfDebug( sprintf( $watched["desc"],
207 $this->describe_changed( $old, $watched["states"] ),
208 $this->describe_changed( $new, $watched["states"] )
214 * Manage savepoints within a transaction
218 class SavepointPostgres
{
219 /** @var DatabaseBase Establish a savepoint within a transaction */
225 * @param DatabaseBase $dbw
228 public function __construct( $dbw, $id ) {
231 $this->didbegin
= false;
232 /* If we are not in a transaction, we need to be for savepoint trickery */
233 if ( !$dbw->trxLevel() ) {
234 $dbw->begin( "FOR SAVEPOINT" );
235 $this->didbegin
= true;
239 public function __destruct() {
240 if ( $this->didbegin
) {
241 $this->dbw
->rollback();
242 $this->didbegin
= false;
246 public function commit() {
247 if ( $this->didbegin
) {
248 $this->dbw
->commit();
249 $this->didbegin
= false;
253 protected function query( $keyword, $msg_ok, $msg_failed ) {
254 global $wgDebugDBTransactions;
255 if ( $this->dbw
->doQuery( $keyword . " " . $this->id
) !== false ) {
256 if ( $wgDebugDBTransactions ) {
257 wfDebug( sprintf( $msg_ok, $this->id
) );
260 wfDebug( sprintf( $msg_failed, $this->id
) );
264 public function savepoint() {
265 $this->query( "SAVEPOINT",
266 "Transaction state: savepoint \"%s\" established.\n",
267 "Transaction state: establishment of savepoint \"%s\" FAILED.\n"
271 public function release() {
272 $this->query( "RELEASE",
273 "Transaction state: savepoint \"%s\" released.\n",
274 "Transaction state: release of savepoint \"%s\" FAILED.\n"
278 public function rollback() {
279 $this->query( "ROLLBACK TO",
280 "Transaction state: savepoint \"%s\" rolled back.\n",
281 "Transaction state: rollback of savepoint \"%s\" FAILED.\n"
285 public function __toString() {
286 return (string)$this->id
;
293 class DatabasePostgres
extends DatabaseBase
{
295 protected $mLastResult = null;
297 /** @var int The number of rows affected as an integer */
298 protected $mAffectedRows = null;
301 private $mInsertId = null;
303 /** @var float|string */
304 private $numericVersion = null;
306 /** @var string Connect string to open a PostgreSQL connection */
307 private $connectString;
309 /** @var PostgresTransactionState */
310 private $mTransactionState;
313 private $mCoreSchema;
319 function cascadingDeletes() {
323 function cleanupTriggers() {
327 function strictIPs() {
331 function realTimestamps() {
335 function implicitGroupby() {
339 function implicitOrderby() {
343 function searchableIPs() {
347 function functionalIndexes() {
351 function hasConstraint( $name ) {
352 $sql = "SELECT 1 FROM pg_catalog.pg_constraint c, pg_catalog.pg_namespace n " .
353 "WHERE c.connamespace = n.oid AND conname = '" .
354 pg_escape_string( $this->mConn
, $name ) . "' AND n.nspname = '" .
355 pg_escape_string( $this->mConn
, $this->getCoreSchema() ) . "'";
356 $res = $this->doQuery( $sql );
358 return $this->numRows( $res );
362 * Usually aborts on failure
363 * @param string $server
364 * @param string $user
365 * @param string $password
366 * @param string $dbName
367 * @throws DBConnectionError|Exception
368 * @return DatabaseBase|null
370 function open( $server, $user, $password, $dbName ) {
371 # Test for Postgres support, to avoid suppressed fatal error
372 if ( !function_exists( 'pg_connect' ) ) {
373 throw new DBConnectionError(
375 "Postgres functions missing, have you compiled PHP with the --with-pgsql\n" .
376 "option? (Note: if you recently installed PHP, you may need to restart your\n" .
377 "webserver and database)\n"
383 if ( !strlen( $user ) ) { # e.g. the class is being loaded
387 $this->mServer
= $server;
389 $this->mUser
= $user;
390 $this->mPassword
= $password;
391 $this->mDBname
= $dbName;
393 $connectVars = array(
396 'password' => $password
398 if ( $server != false && $server != '' ) {
399 $connectVars['host'] = $server;
401 if ( $port != false && $port != '' ) {
402 $connectVars['port'] = $port;
404 if ( $this->mFlags
& DBO_SSL
) {
405 $connectVars['sslmode'] = 1;
408 $this->connectString
= $this->makeConnectionString( $connectVars, PGSQL_CONNECT_FORCE_NEW
);
410 $this->installErrorHandler();
413 $this->mConn
= pg_connect( $this->connectString
);
414 } catch ( Exception
$ex ) {
415 $this->restoreErrorHandler();
419 $phpError = $this->restoreErrorHandler();
421 if ( !$this->mConn
) {
422 wfDebug( "DB connection error\n" );
423 wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " .
424 substr( $password, 0, 3 ) . "...\n" );
425 wfDebug( $this->lastError() . "\n" );
426 throw new DBConnectionError( $this, str_replace( "\n", ' ', $phpError ) );
429 $this->mOpened
= true;
430 $this->mTransactionState
= new PostgresTransactionState( $this->mConn
);
432 global $wgCommandLineMode;
433 # If called from the command-line (e.g. importDump), only show errors
434 if ( $wgCommandLineMode ) {
435 $this->doQuery( "SET client_min_messages = 'ERROR'" );
438 $this->query( "SET client_encoding='UTF8'", __METHOD__
);
439 $this->query( "SET datestyle = 'ISO, YMD'", __METHOD__
);
440 $this->query( "SET timezone = 'GMT'", __METHOD__
);
441 $this->query( "SET standard_conforming_strings = on", __METHOD__
);
442 if ( $this->getServerVersion() >= 9.0 ) {
443 $this->query( "SET bytea_output = 'escape'", __METHOD__
); // PHP bug 53127
446 global $wgDBmwschema;
447 $this->determineCoreSchema( $wgDBmwschema );
453 * Postgres doesn't support selectDB in the same way MySQL does. So if the
454 * DB name doesn't match the open connection, open a new one
458 function selectDB( $db ) {
459 if ( $this->mDBname
!== $db ) {
460 return (bool)$this->open( $this->mServer
, $this->mUser
, $this->mPassword
, $db );
466 function makeConnectionString( $vars ) {
468 foreach ( $vars as $name => $value ) {
469 $s .= "$name='" . str_replace( "'", "\\'", $value ) . "' ";
476 * Closes a database connection, if it is open
477 * Returns success, true if already closed
480 protected function closeConnection() {
481 return pg_close( $this->mConn
);
484 public function doQuery( $sql ) {
485 if ( function_exists( 'mb_convert_encoding' ) ) {
486 $sql = mb_convert_encoding( $sql, 'UTF-8' );
488 $this->mTransactionState
->check();
489 if ( pg_send_query( $this->mConn
, $sql ) === false ) {
490 throw new DBUnexpectedError( $this, "Unable to post new query to PostgreSQL\n" );
492 $this->mLastResult
= pg_get_result( $this->mConn
);
493 $this->mTransactionState
->check();
494 $this->mAffectedRows
= null;
495 if ( pg_result_error( $this->mLastResult
) ) {
499 return $this->mLastResult
;
502 protected function dumpError() {
506 PGSQL_DIAG_MESSAGE_PRIMARY
,
507 PGSQL_DIAG_MESSAGE_DETAIL
,
508 PGSQL_DIAG_MESSAGE_HINT
,
509 PGSQL_DIAG_STATEMENT_POSITION
,
510 PGSQL_DIAG_INTERNAL_POSITION
,
511 PGSQL_DIAG_INTERNAL_QUERY
,
513 PGSQL_DIAG_SOURCE_FILE
,
514 PGSQL_DIAG_SOURCE_LINE
,
515 PGSQL_DIAG_SOURCE_FUNCTION
517 foreach ( $diags as $d ) {
518 wfDebug( sprintf( "PgSQL ERROR(%d): %s\n",
519 $d, pg_result_error_field( $this->mLastResult
, $d ) ) );
523 function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
525 /* Check for constraint violation */
526 if ( $errno === '23505' ) {
527 parent
::reportQueryError( $error, $errno, $sql, $fname, $tempIgnore );
532 /* Transaction stays in the ERROR state until rolledback */
533 if ( $this->mTrxLevel
) {
534 $this->rollback( __METHOD__
);
536 parent
::reportQueryError( $error, $errno, $sql, $fname, false );
539 function queryIgnore( $sql, $fname = __METHOD__
) {
540 return $this->query( $sql, $fname, true );
544 * @param stdClass|ResultWrapper $res
545 * @throws DBUnexpectedError
547 function freeResult( $res ) {
548 if ( $res instanceof ResultWrapper
) {
551 wfSuppressWarnings();
552 $ok = pg_free_result( $res );
555 throw new DBUnexpectedError( $this, "Unable to free Postgres result\n" );
560 * @param ResultWrapper|stdClass $res
562 * @throws DBUnexpectedError
564 function fetchObject( $res ) {
565 if ( $res instanceof ResultWrapper
) {
568 wfSuppressWarnings();
569 $row = pg_fetch_object( $res );
571 # @todo FIXME: HACK HACK HACK HACK debug
573 # @todo hashar: not sure if the following test really trigger if the object
575 if ( pg_last_error( $this->mConn
) ) {
576 throw new DBUnexpectedError(
578 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn
) )
585 function fetchRow( $res ) {
586 if ( $res instanceof ResultWrapper
) {
589 wfSuppressWarnings();
590 $row = pg_fetch_array( $res );
592 if ( pg_last_error( $this->mConn
) ) {
593 throw new DBUnexpectedError(
595 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn
) )
602 function numRows( $res ) {
603 if ( $res instanceof ResultWrapper
) {
606 wfSuppressWarnings();
607 $n = pg_num_rows( $res );
609 if ( pg_last_error( $this->mConn
) ) {
610 throw new DBUnexpectedError(
612 'SQL error: ' . htmlspecialchars( pg_last_error( $this->mConn
) )
619 function numFields( $res ) {
620 if ( $res instanceof ResultWrapper
) {
624 return pg_num_fields( $res );
627 function fieldName( $res, $n ) {
628 if ( $res instanceof ResultWrapper
) {
632 return pg_field_name( $res, $n );
636 * Return the result of the last call to nextSequenceValue();
637 * This must be called after nextSequenceValue().
641 function insertId() {
642 return $this->mInsertId
;
650 function dataSeek( $res, $row ) {
651 if ( $res instanceof ResultWrapper
) {
655 return pg_result_seek( $res, $row );
658 function lastError() {
659 if ( $this->mConn
) {
660 if ( $this->mLastResult
) {
661 return pg_result_error( $this->mLastResult
);
663 return pg_last_error();
666 return 'No database connection';
670 function lastErrno() {
671 if ( $this->mLastResult
) {
672 return pg_result_error_field( $this->mLastResult
, PGSQL_DIAG_SQLSTATE
);
678 function affectedRows() {
679 if ( !is_null( $this->mAffectedRows
) ) {
680 // Forced result for simulated queries
681 return $this->mAffectedRows
;
683 if ( empty( $this->mLastResult
) ) {
687 return pg_affected_rows( $this->mLastResult
);
691 * Estimate rows in dataset
692 * Returns estimated count, based on EXPLAIN output
693 * This is not necessarily an accurate estimate, so use sparingly
694 * Returns -1 if count cannot be found
695 * Takes same arguments as Database::select()
697 * @param string $table
698 * @param string $vars
699 * @param string $conds
700 * @param string $fname
701 * @param array $options
704 function estimateRowCount( $table, $vars = '*', $conds = '',
705 $fname = __METHOD__
, $options = array()
707 $options['EXPLAIN'] = true;
708 $res = $this->select( $table, $vars, $conds, $fname, $options );
711 $row = $this->fetchRow( $res );
713 if ( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
722 * Returns information about an index
723 * If errors are explicitly ignored, returns NULL on failure
725 * @param string $table
726 * @param string $index
727 * @param string $fname
730 function indexInfo( $table, $index, $fname = __METHOD__
) {
731 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
732 $res = $this->query( $sql, $fname );
736 foreach ( $res as $row ) {
737 if ( $row->indexname
== $this->indexName( $index ) ) {
746 * Returns is of attributes used in index
749 * @param string $index
750 * @param bool|string $schema
753 function indexAttributes( $index, $schema = false ) {
754 if ( $schema === false ) {
755 $schema = $this->getCoreSchema();
758 * A subquery would be not needed if we didn't care about the order
759 * of attributes, but we do
761 $sql = <<<__INDEXATTR__
765 i.indoption[s.g] as option,
768 (SELECT generate_series(array_lower(isub.indkey,1), array_upper(isub.indkey,1)) AS g
772 ON cis.oid=isub.indexrelid
774 ON cis.relnamespace = ns.oid
775 WHERE cis.relname='$index' AND ns.nspname='$schema') AS s,
781 ON ci.oid=i.indexrelid
783 ON ct.oid = i.indrelid
785 ON ci.relnamespace = n.oid
787 ci.relname='$index' AND n.nspname='$schema'
788 AND attrelid = ct.oid
789 AND i.indkey[s.g] = attnum
790 AND i.indclass[s.g] = opcls.oid
791 AND pg_am.oid = opcls.opcmethod
793 $res = $this->query( $sql, __METHOD__ );
796 foreach ( $res as $row ) {
810 function indexUnique( $table, $index, $fname = __METHOD__ ) {
811 $sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'" .
812 " AND indexdef LIKE 'CREATE UNIQUE%(" .
813 $this->strencode( $this->indexName( $index ) ) .
815 $res = $this->query( $sql, $fname );
820 return $res->numRows() > 0;
824 * Change the FOR UPDATE option as necessary based on the join conditions. Then pass
825 * to the parent function to get the actual SQL text.
827 * In Postgres when using FOR UPDATE, only the main table and tables that are inner joined
828 * can be locked. That means tables in an outer join cannot be FOR UPDATE locked. Trying to do
829 * so causes a DB error. This wrapper checks which tables can be locked and adjusts it accordingly.
831 * MySQL uses "ORDER BY NULL" as an optimization hint, but that syntax is illegal in PostgreSQL.
833 function selectSQLText( $table, $vars, $conds = '', $fname = __METHOD__,
834 $options = array(), $join_conds = array()
836 if ( is_array( $options ) ) {
837 $forUpdateKey = array_search( 'FOR UPDATE', $options, true );
838 if ( $forUpdateKey !== false && $join_conds ) {
839 unset( $options[$forUpdateKey] );
841 foreach ( $join_conds as $table_cond => $join_cond ) {
842 if ( 0 === preg_match( '/^(?:LEFT|RIGHT|FULL)(?: OUTER)? JOIN$/i', $join_cond[0] ) ) {
843 $options['FOR UPDATE'][] = $table_cond;
848 if ( isset( $options['ORDER BY'] ) && $options['ORDER BY'] == 'NULL' ) {
849 unset( $options['ORDER BY'] );
853 return parent::selectSQLText( $table, $vars, $conds, $fname, $options, $join_conds );
857 * INSERT wrapper, inserts an array into a table
859 * $args may be a single associative array, or an array of these with numeric keys,
860 * for multi-row insert (Postgres version 8.2 and above only).
862 * @param string $table Name of the table to insert to.
863 * @param array $args Items to insert into the table.
864 * @param string $fname Name of the function, for profiling
865 * @param array|string $options String or array. Valid options: IGNORE
866 * @return bool Success of insert operation. IGNORE always returns true.
868 function insert( $table, $args, $fname = __METHOD__, $options = array() ) {
869 if ( !count( $args ) ) {
873 $table = $this->tableName( $table );
874 if ( !isset( $this->numericVersion ) ) {
875 $this->getServerVersion();
878 if ( !is_array( $options ) ) {
879 $options = array( $options );
882 if ( isset( $args[0] ) && is_array( $args[0] ) ) {
884 $keys = array_keys( $args[0] );
887 $keys = array_keys( $args );
890 // If IGNORE is set, we use savepoints to emulate mysql's behavior
892 if ( in_array( 'IGNORE', $options ) ) {
893 $savepoint = new SavepointPostgres( $this, 'mw' );
894 $olde = error_reporting( 0 );
895 // For future use, we may want to track the number of actual inserts
896 // Right now, insert (all writes) simply return true/false
897 $numrowsinserted = 0;
900 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
903 if ( $this->numericVersion >= 8.2 && !$savepoint ) {
905 foreach ( $args as $row ) {
911 $sql .= '(' . $this->makeList( $row ) . ')';
913 $res = (bool)$this->query( $sql, $fname, $savepoint );
917 foreach ( $args as $row ) {
919 $tempsql .= '(' . $this->makeList( $row ) . ')';
922 $savepoint->savepoint();
925 $tempres = (bool)$this->query( $tempsql, $fname, $savepoint );
928 $bar = pg_last_error();
929 if ( $bar != false ) {
930 $savepoint->rollback();
932 $savepoint->release();
937 // If any of them fail, we fail overall for this function call
938 // Note that this will be ignored if IGNORE is set
945 // Not multi, just a lone insert
947 $savepoint->savepoint();
950 $sql .= '(' . $this->makeList( $args ) . ')';
951 $res = (bool)$this->query( $sql, $fname, $savepoint );
953 $bar = pg_last_error();
954 if ( $bar != false ) {
955 $savepoint->rollback();
957 $savepoint->release();
963 error_reporting( $olde );
964 $savepoint->commit();
966 // Set the affected row count for the whole operation
967 $this->mAffectedRows = $numrowsinserted;
969 // IGNORE always returns true
977 * INSERT SELECT wrapper
978 * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
979 * Source items may be literals rather then field names, but strings should
980 * be quoted with Database::addQuotes()
981 * $conds may be "*" to copy the whole table
982 * srcTable may be an array of tables.
983 * @todo FIXME: Implement this a little better (seperate select/insert)?
985 * @param string $destTable
986 * @param array|string $srcTable
987 * @param array $varMap
988 * @param array $conds
989 * @param string $fname
990 * @param array $insertOptions
991 * @param array $selectOptions
994 function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
995 $insertOptions = array(), $selectOptions = array() ) {
996 $destTable = $this->tableName( $destTable );
998 if ( !is_array( $insertOptions ) ) {
999 $insertOptions = array( $insertOptions );
1003 * If IGNORE is set, we use savepoints to emulate mysql's behavior
1004 * Ignore LOW PRIORITY option, since it is MySQL-specific
1007 if ( in_array( 'IGNORE', $insertOptions ) ) {
1008 $savepoint = new SavepointPostgres( $this, 'mw' );
1009 $olde = error_reporting( 0 );
1010 $numrowsinserted = 0;
1011 $savepoint->savepoint();
1014 if ( !is_array( $selectOptions ) ) {
1015 $selectOptions = array( $selectOptions );
1017 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
1018 if ( is_array( $srcTable ) ) {
1019 $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
1021 $srcTable = $this->tableName( $srcTable );
1024 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
1025 " SELECT $startOpts " . implode( ',', $varMap ) .
1026 " FROM $srcTable $useIndex";
1028 if ( $conds != '*' ) {
1029 $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1032 $sql .= " $tailOpts";
1034 $res = (bool)$this->query( $sql, $fname, $savepoint );
1036 $bar = pg_last_error();
1037 if ( $bar != false ) {
1038 $savepoint->rollback();
1040 $savepoint->release();
1043 error_reporting( $olde );
1044 $savepoint->commit();
1046 // Set the affected row count for the whole operation
1047 $this->mAffectedRows = $numrowsinserted;
1049 // IGNORE always returns true
1056 function tableName( $name, $format = 'quoted' ) {
1057 # Replace reserved words with better ones
1060 return $this->realTableName( 'mwuser', $format );
1062 return $this->realTableName( 'pagecontent', $format );
1064 return $this->realTableName( $name, $format );
1068 /* Don't cheat on installer */
1069 function realTableName( $name, $format = 'quoted' ) {
1070 return parent::tableName( $name, $format );
1074 * Return the next in a sequence, save the value for retrieval via insertId()
1076 * @param string $seqName
1079 function nextSequenceValue( $seqName ) {
1080 $safeseq = str_replace( "'", "''", $seqName );
1081 $res = $this->query( "SELECT nextval('$safeseq')" );
1082 $row = $this->fetchRow( $res );
1083 $this->mInsertId = $row[0];
1085 return $this->mInsertId;
1089 * Return the current value of a sequence. Assumes it has been nextval'ed in this session.
1091 * @param string $seqName
1094 function currentSequenceValue( $seqName ) {
1095 $safeseq = str_replace( "'", "''", $seqName );
1096 $res = $this->query( "SELECT currval('$safeseq')" );
1097 $row = $this->fetchRow( $res );
1103 # Returns the size of a text field, or -1 for "unlimited"
1104 function textFieldSize( $table, $field ) {
1105 $table = $this->tableName( $table );
1106 $sql = "SELECT t.typname as ftype,a.atttypmod as size
1107 FROM pg_class c, pg_attribute a, pg_type t
1108 WHERE relname='$table' AND a.attrelid=c.oid AND
1109 a.atttypid=t.oid and a.attname='$field'";
1110 $res = $this->query( $sql );
1111 $row = $this->fetchObject( $res );
1112 if ( $row->ftype == 'varchar' ) {
1113 $size = $row->size - 4;
1121 function limitResult( $sql, $limit, $offset = false ) {
1122 return "$sql LIMIT $limit " . ( is_numeric( $offset ) ? " OFFSET {$offset} " : '' );
1125 function wasDeadlock() {
1126 return $this->lastErrno() == '40P01';
1129 function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = __METHOD__ ) {
1130 $newName = $this->addIdentifierQuotes( $newName );
1131 $oldName = $this->addIdentifierQuotes( $oldName );
1133 return $this->query( 'CREATE ' . ( $temporary ? 'TEMPORARY ' : '' ) . " TABLE $newName " .
1134 "(LIKE $oldName INCLUDING DEFAULTS)", $fname );
1137 function listTables( $prefix = null, $fname = __METHOD__ ) {
1138 $eschema = $this->addQuotes( $this->getCoreSchema() );
1139 $result = $this->query( "SELECT tablename FROM pg_tables WHERE schemaname = $eschema", $fname );
1140 $endArray = array();
1142 foreach ( $result as $table ) {
1143 $vars = get_object_vars( $table );
1144 $table = array_pop( $vars );
1145 if ( !$prefix || strpos( $table, $prefix ) === 0 ) {
1146 $endArray[] = $table;
1153 function timestamp( $ts = 0 ) {
1154 return wfTimestamp( TS_POSTGRES, $ts );
1158 * Posted by cc[plus]php[at]c2se[dot]com on 25-Mar-2009 09:12
1159 * to http://www.php.net/manual/en/ref.pgsql.php
1161 * Parsing a postgres array can be a tricky problem, he's my
1162 * take on this, it handles multi-dimensional arrays plus
1163 * escaping using a nasty regexp to determine the limits of each
1166 * This should really be handled by PHP PostgreSQL module
1169 * @param string $text Postgreql array returned in a text form like {a,b}
1170 * @param string $output
1172 * @param int $offset
1175 function pg_array_parse( $text, &$output, $limit = false, $offset = 1 ) {
1176 if ( false === $limit ) {
1177 $limit = strlen( $text ) - 1;
1180 if ( '{}' == $text ) {
1184 if ( '{' != $text[$offset] ) {
1185 preg_match( "/(\\{?\"([^\"\\\\]|\\\\.)*\"|[^,{}]+)+([,}]+)/",
1186 $text, $match, 0, $offset );
1187 $offset += strlen( $match[0] );
1188 $output[] = ( '"' != $match[1][0]
1190 : stripcslashes( substr( $match[1], 1, -1 ) ) );
1191 if ( '},' == $match[3] ) {
1195 $offset = $this->pg_array_parse( $text, $output, $limit, $offset + 1 );
1197 } while ( $limit > $offset );
1203 * Return aggregated value function call
1204 * @param array $valuedata
1205 * @param string $valuename
1208 public function aggregateValue( $valuedata, $valuename = 'value' ) {
1213 * @return string Wikitext of a link to the server software's web site
1215 public function getSoftwareLink() {
1216 return '[{{int:version-db-postgres-url}} PostgreSQL]';
1220 * Return current schema (executes SELECT current_schema())
1224 * @return string Default schema for the current session
1226 function getCurrentSchema() {
1227 $res = $this->query( "SELECT current_schema()", __METHOD__ );
1228 $row = $this->fetchRow( $res );
1234 * Return list of schemas which are accessible without schema name
1235 * This is list does not contain magic keywords like "$user"
1238 * @see getSearchPath()
1239 * @see setSearchPath()
1241 * @return array List of actual schemas for the current sesson
1243 function getSchemas() {
1244 $res = $this->query( "SELECT current_schemas(false)", __METHOD__ );
1245 $row = $this->fetchRow( $res );
1248 /* PHP pgsql support does not support array type, "{a,b}" string is returned */
1250 return $this->pg_array_parse( $row[0], $schemas );
1254 * Return search patch for schemas
1255 * This is different from getSchemas() since it contain magic keywords
1260 * @return array How to search for table names schemas for the current user
1262 function getSearchPath() {
1263 $res = $this->query( "SHOW search_path", __METHOD__ );
1264 $row = $this->fetchRow( $res );
1266 /* PostgreSQL returns SHOW values as strings */
1268 return explode( ",", $row[0] );
1272 * Update search_path, values should already be sanitized
1273 * Values may contain magic keywords like "$user"
1276 * @param array $search_path List of schemas to be searched by default
1278 function setSearchPath( $search_path ) {
1279 $this->query( "SET search_path = " . implode( ", ", $search_path ) );
1283 * Determine default schema for MediaWiki core
1284 * Adjust this session schema search path if desired schema exists
1285 * and is not alread there.
1287 * We need to have name of the core schema stored to be able
1288 * to query database metadata.
1290 * This will be also called by the installer after the schema is created
1294 * @param string $desiredSchema
1296 function determineCoreSchema( $desiredSchema ) {
1297 $this->begin( __METHOD__ );
1298 if ( $this->schemaExists( $desiredSchema ) ) {
1299 if ( in_array( $desiredSchema, $this->getSchemas() ) ) {
1300 $this->mCoreSchema = $desiredSchema;
1301 wfDebug( "Schema \"" . $desiredSchema . "\" already in the search path\n" );
1304 * Prepend our schema (e.g. 'mediawiki') in front
1305 * of the search path
1308 $search_path = $this->getSearchPath();
1309 array_unshift( $search_path,
1310 $this->addIdentifierQuotes( $desiredSchema ) );
1311 $this->setSearchPath( $search_path );
1312 $this->mCoreSchema = $desiredSchema;
1313 wfDebug( "Schema \"" . $desiredSchema . "\" added to the search path\n" );
1316 $this->mCoreSchema = $this->getCurrentSchema();
1317 wfDebug( "Schema \"" . $desiredSchema . "\" not found, using current \"" .
1318 $this->mCoreSchema . "\"\n" );
1320 /* Commit SET otherwise it will be rollbacked on error or IGNORE SELECT */
1321 $this->commit( __METHOD__ );
1325 * Return schema name fore core MediaWiki tables
1328 * @return string Core schema name
1330 function getCoreSchema() {
1331 return $this->mCoreSchema;
1335 * @return string Version information from the database
1337 function getServerVersion() {
1338 if ( !isset( $this->numericVersion ) ) {
1339 $versionInfo = pg_version( $this->mConn );
1340 if ( version_compare( $versionInfo['client'], '7.4.0', 'lt' ) ) {
1341 // Old client, abort install
1342 $this->numericVersion = '7.3 or earlier';
1343 } elseif ( isset( $versionInfo['server'] ) ) {
1345 $this->numericVersion = $versionInfo['server'];
1347 // Bug 16937: broken pgsql extension from PHP<5.3
1348 $this->numericVersion = pg_parameter_status( $this->mConn, 'server_version' );
1352 return $this->numericVersion;
1356 * Query whether a given relation exists (in the given schema, or the
1357 * default mw one if not given)
1358 * @param string $table
1359 * @param array|string $types
1360 * @param bool|string $schema
1363 function relationExists( $table, $types, $schema = false ) {
1364 if ( !is_array( $types ) ) {
1365 $types = array( $types );
1368 $schema = $this->getCoreSchema();
1370 $table = $this->realTableName( $table, 'raw' );
1371 $etable = $this->addQuotes( $table );
1372 $eschema = $this->addQuotes( $schema );
1373 $sql = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
1374 . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
1375 . "AND c.relkind IN ('" . implode( "','", $types ) . "')";
1376 $res = $this->query( $sql );
1377 $count = $res ? $res->numRows() : 0;
1379 return (bool)$count;
1383 * For backward compatibility, this function checks both tables and
1385 * @param string $table
1386 * @param string $fname
1387 * @param bool|string $schema
1390 function tableExists( $table, $fname = __METHOD__, $schema = false ) {
1391 return $this->relationExists( $table, array( 'r', 'v' ), $schema );
1394 function sequenceExists( $sequence, $schema = false ) {
1395 return $this->relationExists( $sequence, 'S', $schema );
1398 function triggerExists( $table, $trigger ) {
1400 SELECT 1 FROM pg_class, pg_namespace, pg_trigger
1401 WHERE relnamespace=pg_namespace.oid AND relkind='r'
1402 AND tgrelid=pg_class.oid
1403 AND nspname=%s AND relname=%s AND tgname=%s
1405 $res = $this->query(
1408 $this->addQuotes( $this->getCoreSchema() ),
1409 $this->addQuotes( $table ),
1410 $this->addQuotes( $trigger )
1416 $rows = $res->numRows();
1421 function ruleExists( $table, $rule ) {
1422 $exists = $this->selectField( 'pg_rules', 'rulename',
1424 'rulename' => $rule,
1425 'tablename' => $table,
1426 'schemaname' => $this->getCoreSchema()
1430 return $exists === $rule;
1433 function constraintExists( $table, $constraint ) {
1434 $sql = sprintf( "SELECT 1 FROM information_schema.table_constraints " .
1435 "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
1436 $this->addQuotes( $this->getCoreSchema() ),
1437 $this->addQuotes( $table ),
1438 $this->addQuotes( $constraint )
1440 $res = $this->query( $sql );
1444 $rows = $res->numRows();
1450 * Query whether a given schema exists. Returns true if it does, false if it doesn't.
1451 * @param string $schema
1454 function schemaExists( $schema ) {
1455 $exists = $this->selectField( '"pg_catalog"."pg_namespace"', 1,
1456 array( 'nspname' => $schema ), __METHOD__ );
1458 return (bool)$exists;
1462 * Returns true if a given role (i.e. user) exists, false otherwise.
1463 * @param string $roleName
1466 function roleExists( $roleName ) {
1467 $exists = $this->selectField( '"pg_catalog"."pg_roles"', 1,
1468 array( 'rolname' => $roleName ), __METHOD__ );
1470 return (bool)$exists;
1473 function fieldInfo( $table, $field ) {
1474 return PostgresField::fromText( $this, $table, $field );
1478 * pg_field_type() wrapper
1479 * @param ResultWrapper|resource $res ResultWrapper or PostgreSQL query result resource
1480 * @param int $index Field number, starting from 0
1483 function fieldType( $res, $index ) {
1484 if ( $res instanceof ResultWrapper ) {
1485 $res = $res->result;
1488 return pg_field_type( $res, $index );
1495 function encodeBlob( $b ) {
1496 return new Blob( pg_escape_bytea( $this->mConn, $b ) );
1499 function decodeBlob( $b ) {
1500 if ( $b instanceof Blob ) {
1504 return pg_unescape_bytea( $b );
1507 function strencode( $s ) { # Should not be called by us
1508 return pg_escape_string( $this->mConn, $s );
1512 * @param null|bool|Blob $s
1513 * @return int|string
1515 function addQuotes( $s ) {
1516 if ( is_null( $s ) ) {
1518 } elseif ( is_bool( $s ) ) {
1519 return intval( $s );
1520 } elseif ( $s instanceof Blob ) {
1521 return "'" . $s->fetch( $s ) . "'";
1524 return "'" . pg_escape_string( $this->mConn, $s ) . "'";
1528 * Postgres specific version of replaceVars.
1529 * Calls the parent version in Database.php
1531 * @param string $ins SQL string, read from a stream (usually tables.sql)
1532 * @return string SQL string
1534 protected function replaceVars( $ins ) {
1535 $ins = parent::replaceVars( $ins );
1537 if ( $this->numericVersion >= 8.3 ) {
1538 // Thanks for not providing backwards-compatibility, 8.3
1539 $ins = preg_replace( "/to_tsvector\s*\(\s*'default'\s*,/", 'to_tsvector(', $ins );
1542 if ( $this->numericVersion <= 8.1 ) { // Our minimum version
1543 $ins = str_replace( 'USING gin', 'USING gist', $ins );
1550 * Various select options
1552 * @param array $options An associative array of options to be turned into
1553 * an SQL query, valid keys are listed in the function.
1556 function makeSelectOptions( $options ) {
1557 $preLimitTail = $postLimitTail = '';
1558 $startOpts = $useIndex = '';
1560 $noKeyOptions = array();
1561 foreach ( $options as $key => $option ) {
1562 if ( is_numeric( $key ) ) {
1563 $noKeyOptions[$option] = true;
1567 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1569 $preLimitTail .= $this->makeOrderBy( $options );
1571 //if ( isset( $options['LIMIT'] ) ) {
1572 // $tailOpts .= $this->limitResult( '', $options['LIMIT'],
1573 // isset( $options['OFFSET'] ) ? $options['OFFSET']
1577 if ( isset( $options['FOR UPDATE'] ) ) {
1578 $postLimitTail .= ' FOR UPDATE OF ' .
1579 implode( ', ', array_map( array( &$this, 'tableName' ), $options['FOR UPDATE'] ) );
1580 } elseif ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1581 $postLimitTail .= ' FOR UPDATE';
1584 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1585 $startOpts .= 'DISTINCT';
1588 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1591 function getDBname() {
1592 return $this->mDBname;
1595 function getServer() {
1596 return $this->mServer;
1599 function buildConcat( $stringList ) {
1600 return implode( ' || ', $stringList );
1603 public function buildGroupConcatField(
1604 $delimiter, $table, $field, $conds = '', $options = array(), $join_conds = array()
1606 $fld = "array_to_string(array_agg($field)," . $this->addQuotes( $delimiter ) . ')';
1608 return '(' . $this->selectSQLText( $table, $fld, $conds, null, array(), $join_conds ) . ')';
1611 public function getSearchEngine() {
1612 return 'SearchPostgres';
1615 public function streamStatementEnd( &$sql, &$newLine ) {
1616 # Allow dollar quoting for function declarations
1617 if ( substr( $newLine, 0, 4 ) == '$mw$' ) {
1618 if ( $this->delimiter ) {
1619 $this->delimiter = false;
1621 $this->delimiter = ';';
1625 return parent::streamStatementEnd( $sql, $newLine );
1629 * Check to see if a named lock is available. This is non-blocking.
1630 * See http://www.postgresql.org/docs/8.2/static/functions-admin.html#FUNCTIONS-ADVISORY-LOCKS
1632 * @param string $lockName Name of lock to poll
1633 * @param string $method Name of method calling us
1637 public function lockIsFree( $lockName, $method ) {
1638 $key = $this->addQuotes( $this->bigintFromLockName( $lockName ) );
1639 $result = $this->query( "SELECT (CASE(pg_try_advisory_lock($key))
1640 WHEN 'f' THEN 'f' ELSE pg_advisory_unlock($key) END) AS lockstatus", $method );
1641 $row = $this->fetchObject( $result );
1643 return ( $row->lockstatus === 't' );
1647 * See http://www.postgresql.org/docs/8.2/static/functions-admin.html#FUNCTIONS-ADVISORY-LOCKS
1648 * @param string $lockName
1649 * @param string $method
1650 * @param int $timeout
1653 public function lock( $lockName, $method, $timeout = 5 ) {
1654 $key = $this->addQuotes( $this->bigintFromLockName( $lockName ) );
1655 for ( $attempts = 1; $attempts <= $timeout; ++$attempts ) {
1656 $result = $this->query(
1657 "SELECT pg_try_advisory_lock($key) AS lockstatus", $method );
1658 $row = $this->fetchObject( $result );
1659 if ( $row->lockstatus === 't' ) {
1665 wfDebug( __METHOD__ . " failed to acquire lock\n" );
1671 * See http://www.postgresql.org/docs/8.2/static/functions-admin.html#FUNCTIONS-ADVISORY-LOCKSFROM
1672 * PG DOCS: http://www.postgresql.org/docs/8.2/static/functions-admin.html#FUNCTIONS-ADVISORY-LOCKS
1673 * @param string $lockName
1674 * @param string $method
1677 public function unlock( $lockName, $method ) {
1678 $key = $this->addQuotes( $this->bigintFromLockName( $lockName ) );
1679 $result = $this->query( "SELECT pg_advisory_unlock($key) as lockstatus", $method );
1680 $row = $this->fetchObject( $result );
1682 return ( $row->lockstatus === 't' );
1686 * @param string $lockName
1687 * @return string Integer
1689 private function bigintFromLockName( $lockName ) {
1690 return wfBaseConvert( substr( sha1( $lockName ), 0, 15 ), 16, 10 );
1692 } // end DatabasePostgres class