query(sprintf($q,
$db->addQuotes($wgDBmwschema),
$db->addQuotes($table),
$db->addQuotes($field)));
$row = $db->fetchObject($res);
if (!$row)
return null;
$n = new PostgresField;
$n->type = $row->typname;
$n->nullable = ($row->attnotnull == 'f');
$n->name = $field;
$n->tablename = $table;
$n->max_length = $row->attlen;
return $n;
}
function name() {
return $this->name;
}
function tableName() {
return $this->tablename;
}
function type() {
return $this->type;
}
function nullable() {
return $this->nullable;
}
function maxLength() {
return $this->max_length;
}
}
/**
* @addtogroup Database
*/
class DatabasePostgres extends Database {
var $mInsertId = NULL;
var $mLastResult = NULL;
var $numeric_version = NULL;
function DatabasePostgres($server = false, $user = false, $password = false, $dbName = false,
$failFunction = false, $flags = 0 )
{
global $wgOut;
# Can't get a reference if it hasn't been set yet
if ( !isset( $wgOut ) ) {
$wgOut = NULL;
}
$this->mOut =& $wgOut;
$this->mFailFunction = $failFunction;
$this->mFlags = $flags;
$this->open( $server, $user, $password, $dbName);
}
function cascadingDeletes() {
return true;
}
function cleanupTriggers() {
return true;
}
function strictIPs() {
return true;
}
function realTimestamps() {
return true;
}
function implicitGroupby() {
return false;
}
function implicitOrderby() {
return false;
}
function searchableIPs() {
return true;
}
function functionalIndexes() {
return true;
}
static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0)
{
return new DatabasePostgres( $server, $user, $password, $dbName, $failFunction, $flags );
}
/**
* Usually aborts on failure
* If the failFunction is set to a non-zero integer, returns success
*/
function open( $server, $user, $password, $dbName ) {
# Test for Postgres support, to avoid suppressed fatal error
if ( !function_exists( 'pg_connect' ) ) {
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" );
}
global $wgDBport;
if (!strlen($user)) { ## e.g. the class is being loaded
return;
}
$this->close();
$this->mServer = $server;
$port = $wgDBport;
$this->mUser = $user;
$this->mPassword = $password;
$this->mDBname = $dbName;
$hstring="";
if ($server!=false && $server!="") {
$hstring="host=$server ";
}
if ($port!=false && $port!="") {
$hstring .= "port=$port ";
}
error_reporting( E_ALL );
@$this->mConn = pg_connect("$hstring dbname=$dbName user=$user password=$password");
if ( $this->mConn == false ) {
wfDebug( "DB connection error\n" );
wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
wfDebug( $this->lastError()."\n" );
return false;
}
$this->mOpened = true;
## If this is the initial connection, setup the schema stuff and possibly create the user
## TODO: Move this out of open()
if (defined('MEDIAWIKI_INSTALL')) {
global $wgDBname, $wgDBuser, $wgDBpassword, $wgDBsuperuser, $wgDBmwschema,
$wgDBts2schema;
print "Checking the version of Postgres...";
$version = $this->getServerVersion();
$PGMINVER = "8.1";
if ($this->numeric_version < $PGMINVER) {
print "FAILED. Required version is $PGMINVER. You have $this->numeric_version ($version)\n";
dieout("");
}
print "version $this->numeric_version is OK.\n";
$safeuser = $this->quote_ident($wgDBuser);
## Are we connecting as a superuser for the first time?
if ($wgDBsuperuser) {
## Are we really a superuser? Check out our rights
$SQL = "SELECT
CASE WHEN usesuper IS TRUE THEN
CASE WHEN usecreatedb IS TRUE THEN 3 ELSE 1 END
ELSE CASE WHEN usecreatedb IS TRUE THEN 2 ELSE 0 END
END AS rights
FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBsuperuser);
$rows = $this->numRows($res = $this->doQuery($SQL));
if (!$rows) {
print "ERROR: Could not read permissions for user \"$wgDBsuperuser\"\n";
dieout('');
}
$perms = pg_fetch_result($res, 0, 0);
$SQL = "SELECT 1 FROM pg_catalog.pg_user WHERE usename = " . $this->addQuotes($wgDBuser);
$rows = $this->numRows($this->doQuery($SQL));
if ($rows) {
print "User \"$wgDBuser\" already exists, skipping account creation.";
}
else {
if ($perms != 1 and $perms != 3) {
print "ERROR: the user \"$wgDBsuperuser\" cannot create other users. ";
print 'Please use a different Postgres user.';
dieout('');
}
print "Creating user $wgDBuser...";
$safepass = $this->addQuotes($wgDBpassword);
$SQL = "CREATE USER $safeuser NOCREATEDB PASSWORD $safepass";
$this->doQuery($SQL);
print "OK\n";
}
## User now exists, check out the database
if ($dbName != $wgDBname) {
$SQL = "SELECT 1 FROM pg_catalog.pg_database WHERE datname = " . $this->addQuotes($wgDBname);
$rows = $this->numRows($this->doQuery($SQL));
if ($rows) {
print "Database \"$wgDBname\" already exists, skipping database creation.";
}
else {
if ($perms < 2) {
print "ERROR: the user \"$wgDBsuperuser\" cannot create databases. ";
print 'Please use a different Postgres user.';
dieout('');
}
print "Creating database $wgDBname...";
$safename = $this->quote_ident($wgDBname);
$SQL = "CREATE DATABASE $safename OWNER $safeuser ";
$this->doQuery($SQL);
print "OK\n";
## Hopefully tsearch2 and plpgsql are in template1...
}
## Reconnect to check out tsearch2 rights for this user
print "Connecting to \"$wgDBname\" as superuser \"$wgDBsuperuser\" to check rights...";
@$this->mConn = pg_connect("$hstring dbname=$wgDBname user=$user password=$password");
if ( $this->mConn == false ) {
print "FAILED TO CONNECT!";
dieout("");
}
print "OK\n";
}
## Tsearch2 checks
print "Checking that tsearch2 is installed in the database \"$wgDBname\"...";
if (! $this->tableExists("pg_ts_cfg", $wgDBts2schema)) {
print "FAILED. tsearch2 must be installed in the database \"$wgDBname\".";
print "Please see this article";
print " for instructions or ask on #postgresql on irc.freenode.net\n";
dieout("");
}
print "OK\n";
print "Ensuring that user \"$wgDBuser\" has select rights on the tsearch2 tables...";
foreach (array('cfg','cfgmap','dict','parser') as $table) {
$SQL = "GRANT SELECT ON pg_ts_$table TO $safeuser";
$this->doQuery($SQL);
}
print "OK\n";
## Setup the schema for this user if needed
$result = $this->schemaExists($wgDBmwschema);
$safeschema = $this->quote_ident($wgDBmwschema);
if (!$result) {
print "Creating schema $wgDBmwschema ...";
$result = $this->doQuery("CREATE SCHEMA $safeschema AUTHORIZATION $safeuser");
if (!$result) {
print "FAILED.\n";
dieout("");
}
print "OK\n";
}
else {
print "Schema already exists, explicitly granting rights...\n";
$safeschema2 = $this->addQuotes($wgDBmwschema);
$SQL = "SELECT 'GRANT ALL ON '||pg_catalog.quote_ident(relname)||' TO $safeuser;'\n".
"FROM pg_catalog.pg_class p, pg_catalog.pg_namespace n\n".
"WHERE relnamespace = n.oid AND n.nspname = $safeschema2\n".
"AND p.relkind IN ('r','S','v')\n";
$SQL .= "UNION\n";
$SQL .= "SELECT 'GRANT ALL ON FUNCTION '||pg_catalog.quote_ident(proname)||'('||\n".
"pg_catalog.oidvectortypes(p.proargtypes)||') TO $safeuser;'\n".
"FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n\n".
"WHERE p.pronamespace = n.oid AND n.nspname = $safeschema2";
$res = $this->doQuery($SQL);
if (!$res) {
print "FAILED. Could not set rights for the user.\n";
dieout("");
}
$this->doQuery("SET search_path = $safeschema");
$rows = $this->numRows($res);
while ($rows) {
$rows--;
$this->doQuery(pg_fetch_result($res, $rows, 0));
}
print "OK";
}
$wgDBsuperuser = '';
return true; ## Reconnect as regular user
} ## end superuser
if (!defined('POSTGRES_SEARCHPATH')) {
## Do we have the basic tsearch2 table?
print "Checking for tsearch2 in the schema \"$wgDBts2schema\"...";
if (! $this->tableExists("pg_ts_dict", $wgDBts2schema)) {
print "FAILED. Make sure tsearch2 is installed. See this article";
print " for instructions.\n";
dieout("");
}
print "OK\n";
## Does this user have the rights to the tsearch2 tables?
$ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
print "Checking tsearch2 permissions...";
## Let's check all four, just to be safe
error_reporting( 0 );
$ts2tables = array('cfg','cfgmap','dict','parser');
foreach ( $ts2tables AS $tname ) {
$SQL = "SELECT count(*) FROM $wgDBts2schema.pg_ts_$tname";
$res = $this->doQuery($SQL);
if (!$res) {
print "FAILED to access pg_ts_$tname. Make sure that the user ".
"\"$wgDBuser\" has SELECT access to all four tsearch2 tables\n";
dieout("");
}
}
$SQL = "SELECT ts_name FROM $wgDBts2schema.pg_ts_cfg WHERE locale = '$ctype'";
$SQL .= " ORDER BY CASE WHEN ts_name <> 'default' THEN 1 ELSE 0 END";
$res = $this->doQuery($SQL);
error_reporting( E_ALL );
if (!$res) {
print "FAILED. Could not determine the tsearch2 locale information\n";
dieout("");
}
print "OK";
## Will the current locale work? Can we force it to?
print "Verifying tsearch2 locale with $ctype...";
$rows = $this->numRows($res);
$resetlocale = 0;
if (!$rows) {
print "not found\n";
print "Attempting to set default tsearch2 locale to \"$ctype\"...";
$resetlocale = 1;
}
else {
$tsname = pg_fetch_result($res, 0, 0);
if ($tsname != 'default') {
print "not set to default ($tsname)";
print "Attempting to change tsearch2 default locale to \"$ctype\"...";
$resetlocale = 1;
}
}
if ($resetlocale) {
$SQL = "UPDATE $wgDBts2schema.pg_ts_cfg SET locale = '$ctype' WHERE ts_name = 'default'";
$res = $this->doQuery($SQL);
if (!$res) {
print "FAILED. ";
print "Please make sure that the locale in pg_ts_cfg for \"default\" is set to \"$ctype\"\n";
dieout("");
}
print "OK";
}
## Final test: try out a simple tsearch2 query
$SQL = "SELECT $wgDBts2schema.to_tsvector('default','MediaWiki tsearch2 testing')";
$res = $this->doQuery($SQL);
if (!$res) {
print "FAILED. Specifically, \"$SQL\" did not work.";
dieout("");
}
print "OK";
## Do we have plpgsql installed?
print "Checking for Pl/Pgsql ...";
$SQL = "SELECT 1 FROM pg_catalog.pg_language WHERE lanname = 'plpgsql'";
$rows = $this->numRows($this->doQuery($SQL));
if ($rows < 1) {
// plpgsql is not installed, but if we have a pg_pltemplate table, we should be able to create it
print "not installed. Attempting to install Pl/Pgsql ...";
$SQL = "SELECT 1 FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace) ".
"WHERE relname = 'pg_pltemplate' AND nspname='pg_catalog'";
$rows = $this->numRows($this->doQuery($SQL));
if ($rows >= 1) {
$olde = error_reporting(0);
error_reporting($olde - E_WARNING);
$result = $this->doQuery("CREATE LANGUAGE plpgsql");
error_reporting($olde);
if (!$result) {
print "FAILED. You need to install the language plpgsql in the database $wgDBname";
dieout("");
}
}
else {
print "FAILED. You need to install the language plpgsql in the database $wgDBname";
dieout("");
}
}
print "OK\n";
## Does the schema already exist? Who owns it?
$result = $this->schemaExists($wgDBmwschema);
if (!$result) {
print "Creating schema $wgDBmwschema ...";
error_reporting( 0 );
$result = $this->doQuery("CREATE SCHEMA $wgDBmwschema");
error_reporting( E_ALL );
if (!$result) {
print "FAILED. The user \"$wgDBuser\" must be able to access the schema. ".
"You can try making them the owner of the database, or try creating the schema with a ".
"different user, and then grant access to the \"$wgDBuser\" user.\n";
dieout("");
}
print "OK\n";
}
else if ($result != $user) {
print "Schema \"$wgDBmwschema\" exists but is not owned by \"$user\". Not ideal.\n";
}
else {
print "Schema \"$wgDBmwschema\" exists and is owned by \"$user\". Excellent.\n";
}
## Always return GMT time to accomodate the existing integer-based timestamp assumption
print "Setting the timezone to GMT for user \"$user\" ...";
$SQL = "ALTER USER $safeuser SET timezone = 'GMT'";
$result = pg_query($this->mConn, $SQL);
if (!$result) {
print "FAILED.\n";
dieout("");
}
print "OK\n";
## Set for the rest of this session
$SQL = "SET timezone = 'GMT'";
$result = pg_query($this->mConn, $SQL);
if (!$result) {
print "Failed to set timezone\n";
dieout("");
}
print "Setting the datestyle to ISO, YMD for user \"$user\" ...";
$SQL = "ALTER USER $safeuser SET datestyle = 'ISO, YMD'";
$result = pg_query($this->mConn, $SQL);
if (!$result) {
print "FAILED.\n";
dieout("");
}
print "OK\n";
## Set for the rest of this session
$SQL = "SET datestyle = 'ISO, YMD'";
$result = pg_query($this->mConn, $SQL);
if (!$result) {
print "Failed to set datestyle\n";
dieout("");
}
## Fix up the search paths if needed
print "Setting the search path for user \"$user\" ...";
$path = $this->quote_ident($wgDBmwschema);
if ($wgDBts2schema !== $wgDBmwschema)
$path .= ", ". $this->quote_ident($wgDBts2schema);
if ($wgDBmwschema !== 'public' and $wgDBts2schema !== 'public')
$path .= ", public";
$SQL = "ALTER USER $safeuser SET search_path = $path";
$result = pg_query($this->mConn, $SQL);
if (!$result) {
print "FAILED.\n";
dieout("");
}
print "OK\n";
## Set for the rest of this session
$SQL = "SET search_path = $path";
$result = pg_query($this->mConn, $SQL);
if (!$result) {
print "Failed to set search_path\n";
dieout("");
}
define( "POSTGRES_SEARCHPATH", $path );
}}
global $wgCommandLineMode;
## If called from the command-line (e.g. importDump), only show errors
if ($wgCommandLineMode) {
$this->doQuery("SET client_min_messages = 'ERROR'");
}
return $this->mConn;
}
/**
* Closes a database connection, if it is open
* Returns success, true if already closed
*/
function close() {
$this->mOpened = false;
if ( $this->mConn ) {
return pg_close( $this->mConn );
} else {
return true;
}
}
function doQuery( $sql ) {
return $this->mLastResult=pg_query( $this->mConn , $sql);
}
function queryIgnore( $sql, $fname = '' ) {
return $this->query( $sql, $fname, true );
}
function freeResult( $res ) {
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
if ( !@pg_free_result( $res ) ) {
throw new DBUnexpectedError($this, "Unable to free Postgres result\n" );
}
}
function fetchObject( $res ) {
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
@$row = pg_fetch_object( $res );
# FIXME: HACK HACK HACK HACK debug
# TODO:
# hashar : not sure if the following test really trigger if the object
# fetching failed.
if( pg_last_error($this->mConn) ) {
throw new DBUnexpectedError($this, 'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
}
return $row;
}
function fetchRow( $res ) {
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
@$row = pg_fetch_array( $res );
if( pg_last_error($this->mConn) ) {
throw new DBUnexpectedError($this, 'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
}
return $row;
}
function numRows( $res ) {
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
@$n = pg_num_rows( $res );
if( pg_last_error($this->mConn) ) {
throw new DBUnexpectedError($this, 'SQL error: ' . htmlspecialchars( pg_last_error($this->mConn) ) );
}
return $n;
}
function numFields( $res ) {
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
return pg_num_fields( $res );
}
function fieldName( $res, $n ) {
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
return pg_field_name( $res, $n );
}
/**
* This must be called after nextSequenceVal
*/
function insertId() {
return $this->mInsertId;
}
function dataSeek( $res, $row ) {
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
return pg_result_seek( $res, $row );
}
function lastError() {
if ( $this->mConn ) {
return pg_last_error();
}
else {
return "No database connection";
}
}
function lastErrno() {
return pg_last_error() ? 1 : 0;
}
function affectedRows() {
if( !isset( $this->mLastResult ) or ! $this->mLastResult )
return 0;
return pg_affected_rows( $this->mLastResult );
}
/**
* Estimate rows in dataset
* Returns estimated count, based on EXPLAIN output
* This is not necessarily an accurate estimate, so use sparingly
* Returns -1 if count cannot be found
* Takes same arguments as Database::select()
*/
function estimateRowCount( $table, $vars='*', $conds='', $fname = 'Database::estimateRowCount', $options = array() ) {
$options['EXPLAIN'] = true;
$res = $this->select( $table, $vars, $conds, $fname, $options );
$rows = -1;
if ( $res ) {
$row = $this->fetchRow( $res );
$count = array();
if( preg_match( '/rows=(\d+)/', $row[0], $count ) ) {
$rows = $count[1];
}
$this->freeResult($res);
}
return $rows;
}
/**
* Returns information about an index
* If errors are explicitly ignored, returns NULL on failure
*/
function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
$sql = "SELECT indexname FROM pg_indexes WHERE tablename='$table'";
$res = $this->query( $sql, $fname );
if ( !$res ) {
return NULL;
}
while ( $row = $this->fetchObject( $res ) ) {
if ( $row->indexname == $index ) {
return $row;
}
}
return false;
}
function indexUnique ($table, $index, $fname = 'Database::indexUnique' ) {
$sql = "SELECT indexname FROM pg_indexes WHERE tablename='{$table}'".
" AND indexdef LIKE 'CREATE UNIQUE%({$index})'";
$res = $this->query( $sql, $fname );
if ( !$res )
return NULL;
while ($row = $this->fetchObject( $res ))
return true;
return false;
}
/**
* INSERT wrapper, inserts an array into a table
*
* $args may be a single associative array, or an array of these with numeric keys,
* for multi-row insert (Postgres version 8.2 and above only).
*
* @param array $table String: Name of the table to insert to.
* @param array $args Array: Items to insert into the table.
* @param array $fname String: Name of the function, for profiling
* @param mixed $options String or Array. Valid options: IGNORE
*
* @return bool Success of insert operation. IGNORE always returns true.
*/
function insert( $table, $args, $fname = 'DatabasePostgres::insert', $options = array() ) {
global $wgDBversion;
$table = $this->tableName( $table );
if (! isset( $wgDBversion ) ) {
$this->getServerVersion();
$wgDBversion = $this->numeric_version;
}
if ( !is_array( $options ) )
$options = array( $options );
if ( isset( $args[0] ) && is_array( $args[0] ) ) {
$multi = true;
$keys = array_keys( $args[0] );
}
else {
$multi = false;
$keys = array_keys( $args );
}
$ignore = in_array( 'IGNORE', $options ) ? 1 : 0;
if ( $ignore )
$olde = error_reporting( 0 );
$sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES ';
if ( $multi ) {
if ( $wgDBversion >= 8.2 ) {
$first = true;
foreach ( $args as $row ) {
if ( $first ) {
$first = false;
} else {
$sql .= ',';
}
$sql .= '(' . $this->makeList( $row ) . ')';
}
$res = (bool)$this->query( $sql, $fname, $ignore );
}
else {
$res = true;
$origsql = $sql;
foreach ( $args as $row ) {
$tempsql = $origsql;
$tempsql .= '(' . $this->makeList( $row ) . ')';
$tempres = (bool)$this->query( $tempsql, $fname, $ignore );
if (! $tempres)
$res = false;
}
}
}
else {
$sql .= '(' . $this->makeList( $args ) . ')';
$res = (bool)$this->query( $sql, $fname, $ignore );
}
if ( $ignore ) {
$olde = error_reporting( $olde );
return true;
}
return $res;
}
function tableName( $name ) {
# Replace reserved words with better ones
switch( $name ) {
case 'user':
return 'mwuser';
case 'text':
return 'pagecontent';
default:
return $name;
}
}
/**
* Return the next in a sequence, save the value for retrieval via insertId()
*/
function nextSequenceValue( $seqName ) {
$safeseq = preg_replace( "/'/", "''", $seqName );
$res = $this->query( "SELECT nextval('$safeseq')" );
$row = $this->fetchRow( $res );
$this->mInsertId = $row[0];
$this->freeResult( $res );
return $this->mInsertId;
}
/**
* Postgres does not have a "USE INDEX" clause, so return an empty string
*/
function useIndexClause( $index ) {
return '';
}
# REPLACE query wrapper
# Postgres simulates this with a DELETE followed by INSERT
# $row is the row to insert, an associative array
# $uniqueIndexes is an array of indexes. Each element may be either a
# field name or an array of field names
#
# It may be more efficient to leave off unique indexes which are unlikely to collide.
# However if you do this, you run the risk of encountering errors which wouldn't have
# occurred in MySQL
function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
$table = $this->tableName( $table );
if (count($rows)==0) {
return;
}
# Single row case
if ( !is_array( reset( $rows ) ) ) {
$rows = array( $rows );
}
foreach( $rows as $row ) {
# Delete rows which collide
if ( $uniqueIndexes ) {
$sql = "DELETE FROM $table WHERE ";
$first = true;
foreach ( $uniqueIndexes as $index ) {
if ( $first ) {
$first = false;
$sql .= "(";
} else {
$sql .= ') OR (';
}
if ( is_array( $index ) ) {
$first2 = true;
foreach ( $index as $col ) {
if ( $first2 ) {
$first2 = false;
} else {
$sql .= ' AND ';
}
$sql .= $col.'=' . $this->addQuotes( $row[$col] );
}
} else {
$sql .= $index.'=' . $this->addQuotes( $row[$index] );
}
}
$sql .= ')';
$this->query( $sql, $fname );
}
# Now insert the row
$sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
$this->makeList( $row, LIST_COMMA ) . ')';
$this->query( $sql, $fname );
}
}
# DELETE where the condition is a join
function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
if ( !$conds ) {
throw new DBUnexpectedError($this, 'Database::deleteJoin() called with empty $conds' );
}
$delTable = $this->tableName( $delTable );
$joinTable = $this->tableName( $joinTable );
$sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
if ( $conds != '*' ) {
$sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
}
$sql .= ')';
$this->query( $sql, $fname );
}
# Returns the size of a text field, or -1 for "unlimited"
function textFieldSize( $table, $field ) {
$table = $this->tableName( $table );
$sql = "SELECT t.typname as ftype,a.atttypmod as size
FROM pg_class c, pg_attribute a, pg_type t
WHERE relname='$table' AND a.attrelid=c.oid AND
a.atttypid=t.oid and a.attname='$field'";
$res =$this->query($sql);
$row=$this->fetchObject($res);
if ($row->ftype=="varchar") {
$size=$row->size-4;
} else {
$size=$row->size;
}
$this->freeResult( $res );
return $size;
}
function lowPriorityOption() {
return '';
}
function limitResult($sql, $limit,$offset=false) {
return "$sql LIMIT $limit ".(is_numeric($offset)?" OFFSET {$offset} ":"");
}
/**
* Returns an SQL expression for a simple conditional.
* Uses CASE on Postgres
*
* @param string $cond SQL expression which will result in a boolean value
* @param string $trueVal SQL expression to return if true
* @param string $falseVal SQL expression to return if false
* @return string SQL fragment
*/
function conditional( $cond, $trueVal, $falseVal ) {
return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
}
function wasDeadlock() {
return $this->lastErrno() == '40P01';
}
function timestamp( $ts=0 ) {
return wfTimestamp(TS_POSTGRES,$ts);
}
/**
* Return aggregated value function call
*/
function aggregateValue ($valuedata,$valuename='value') {
return $valuedata;
}
function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
# Ignore errors during error handling to avoid infinite recursion
$ignore = $this->ignoreErrors( true );
++$this->mErrorCount;
if ($ignore || $tempIgnore) {
wfDebug("SQL ERROR (ignored): $error\n");
$this->ignoreErrors( $ignore );
}
else {
$message = "A database error has occurred\n" .
"Query: $sql\n" .
"Function: $fname\n" .
"Error: $errno $error\n";
throw new DBUnexpectedError($this, $message);
}
}
/**
* @return string wikitext of a link to the server software's web site
*/
function getSoftwareLink() {
return "[http://www.postgresql.org/ PostgreSQL]";
}
/**
* @return string Version information from the database
*/
function getServerVersion() {
$version = pg_fetch_result($this->doQuery("SELECT version()"),0,0);
$thisver = array();
if (!preg_match('/PostgreSQL (\d+\.\d+)(\S+)/', $version, $thisver)) {
die("Could not determine the numeric version from $version!");
}
$this->numeric_version = $thisver[1];
return $version;
}
/**
* Query whether a given relation exists (in the given schema, or the
* default mw one if not given)
*/
function relationExists( $table, $types, $schema = false ) {
global $wgDBmwschema;
if (!is_array($types))
$types = array($types);
if (! $schema )
$schema = $wgDBmwschema;
$etable = $this->addQuotes($table);
$eschema = $this->addQuotes($schema);
$SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n "
. "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema "
. "AND c.relkind IN ('" . implode("','", $types) . "')";
$res = $this->query( $SQL );
$count = $res ? $res->numRows() : 0;
if ($res)
$this->freeResult( $res );
return $count ? true : false;
}
/*
* For backward compatibility, this function checks both tables and
* views.
*/
function tableExists ($table, $schema = false) {
return $this->relationExists($table, array('r', 'v'), $schema);
}
function sequenceExists ($sequence, $schema = false) {
return $this->relationExists($sequence, 'S', $schema);
}
function triggerExists($table, $trigger) {
global $wgDBmwschema;
$q = <<query(sprintf($q,
$this->addQuotes($wgDBmwschema),
$this->addQuotes($table),
$this->addQuotes($trigger)));
if (!$res)
return NULL;
$rows = $res->numRows();
$this->freeResult($res);
return $rows;
}
function ruleExists($table, $rule) {
global $wgDBmwschema;
$exists = $this->selectField("pg_rules", "rulename",
array( "rulename" => $rule,
"tablename" => $table,
"schemaname" => $wgDBmwschema));
return $exists === $rule;
}
function constraintExists($table, $constraint) {
global $wgDBmwschema;
$SQL = sprintf("SELECT 1 FROM information_schema.table_constraints ".
"WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s",
$this->addQuotes($wgDBmwschema),
$this->addQuotes($table),
$this->addQuotes($constraint));
$res = $this->query($SQL);
if (!$res)
return NULL;
$rows = $res->numRows();
$this->freeResult($res);
return $rows;
}
/**
* Query whether a given schema exists. Returns the name of the owner
*/
function schemaExists( $schema ) {
$eschema = preg_replace("/'/", "''", $schema);
$SQL = "SELECT rolname FROM pg_catalog.pg_namespace n, pg_catalog.pg_roles r "
."WHERE n.nspowner=r.oid AND n.nspname = '$eschema'";
$res = $this->query( $SQL );
if ( $res && $res->numRows() ) {
$row = $res->fetchObject();
$owner = $row->rolname;
} else {
$owner = false;
}
if ($res)
$this->freeResult($res);
return $owner;
}
/**
* Query whether a given column exists in the mediawiki schema
*/
function fieldExists( $table, $field, $fname = 'DatabasePostgres::fieldExists' ) {
global $wgDBmwschema;
$etable = preg_replace("/'/", "''", $table);
$eschema = preg_replace("/'/", "''", $wgDBmwschema);
$ecol = preg_replace("/'/", "''", $field);
$SQL = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n, pg_catalog.pg_attribute a "
. "WHERE c.relnamespace = n.oid AND c.relname = '$etable' AND n.nspname = '$eschema' "
. "AND a.attrelid = c.oid AND a.attname = '$ecol'";
$res = $this->query( $SQL, $fname );
$count = $res ? $res->numRows() : 0;
if ($res)
$this->freeResult( $res );
return $count;
}
function fieldInfo( $table, $field ) {
return PostgresField::fromText($this, $table, $field);
}
function begin( $fname = 'DatabasePostgres::begin' ) {
$this->query( 'BEGIN', $fname );
$this->mTrxLevel = 1;
}
function immediateCommit( $fname = 'DatabasePostgres::immediateCommit' ) {
return true;
}
function commit( $fname = 'DatabasePostgres::commit' ) {
$this->query( 'COMMIT', $fname );
$this->mTrxLevel = 0;
}
/* Not even sure why this is used in the main codebase... */
function limitResultForUpdate($sql, $num) {
return $sql;
}
function setup_database() {
global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
## Make sure that we can write to the correct schema
## If not, Postgres will happily and silently go to the next search_path item
$ctest = "mw_test_table";
if ($this->tableExists($ctest, $wgDBmwschema)) {
$this->doQuery("DROP TABLE $wgDBmwschema.$ctest");
}
$SQL = "CREATE TABLE $wgDBmwschema.$ctest(a int)";
$olde = error_reporting( 0 );
$res = $this->doQuery($SQL);
error_reporting( $olde );
if (!$res) {
print "FAILED. Make sure that the user \"$wgDBuser\" can write to the schema \"$wgDBmwschema\"\n";
dieout("");
}
$this->doQuery("DROP TABLE $wgDBmwschema.mw_test_table");
dbsource( "../maintenance/postgres/tables.sql", $this);
## Version-specific stuff
if ($this->numeric_version == 8.1) {
$this->doQuery("CREATE INDEX ts2_page_text ON pagecontent USING gist(textvector)");
$this->doQuery("CREATE INDEX ts2_page_title ON page USING gist(titlevector)");
}
else {
$this->doQuery("CREATE INDEX ts2_page_text ON pagecontent USING gin(textvector)");
$this->doQuery("CREATE INDEX ts2_page_title ON page USING gin(titlevector)");
}
## Update version information
$mwv = $this->addQuotes($wgVersion);
$pgv = $this->addQuotes($this->getServerVersion());
$pgu = $this->addQuotes($this->mUser);
$mws = $this->addQuotes($wgDBmwschema);
$tss = $this->addQuotes($wgDBts2schema);
$pgp = $this->addQuotes($wgDBport);
$dbn = $this->addQuotes($this->mDBname);
$ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);
$SQL = "UPDATE mediawiki_version SET mw_version=$mwv, pg_version=$pgv, pg_user=$pgu, ".
"mw_schema = $mws, ts2_schema = $tss, pg_port=$pgp, pg_dbname=$dbn, ".
"ctype = '$ctype' ".
"WHERE type = 'Creation'";
$this->query($SQL);
## Avoid the non-standard "REPLACE INTO" syntax
$f = fopen( "../maintenance/interwiki.sql", 'r' );
if ($f == false ) {
dieout( "Could not find the interwiki.sql file");
}
## We simply assume it is already empty as we have just created it
$SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
while ( ! feof( $f ) ) {
$line = fgets($f,1024);
$matches = array();
if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
continue;
}
$this->query("$SQL $matches[1],$matches[2])");
}
print " (table interwiki successfully populated)...\n";
$this->doQuery("COMMIT");
}
function encodeBlob( $b ) {
return pg_escape_bytea( $b );
}
function decodeBlob( $b ) {
return pg_unescape_bytea( $b );
}
function strencode( $s ) { ## Should not be called by us
return pg_escape_string( $s );
}
function addQuotes( $s ) {
if ( is_null( $s ) ) {
return 'NULL';
} else if (is_array( $s )) { ## Assume it is bytea data
return "E'$s[1]'";
}
return "'" . pg_escape_string($s) . "'";
// Unreachable: return "E'" . pg_escape_string($s) . "'";
}
function quote_ident( $s ) {
return '"' . preg_replace( '/"/', '""', $s) . '"';
}
/* For now, does nothing */
function selectDB( $db ) {
return true;
}
/**
* Various select options
*
* @private
*
* @param array $options an associative array of options to be turned into
* an SQL query, valid keys are listed in the function.
* @return array
*/
function makeSelectOptions( $options ) {
$preLimitTail = $postLimitTail = '';
$startOpts = $useIndex = '';
$noKeyOptions = array();
foreach ( $options as $key => $option ) {
if ( is_numeric( $key ) ) {
$noKeyOptions[$option] = true;
}
}
if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY " . $options['GROUP BY'];
if ( isset( $options['HAVING'] ) ) $preLimitTail .= " HAVING {$options['HAVING']}";
if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY " . $options['ORDER BY'];
//if (isset($options['LIMIT'])) {
// $tailOpts .= $this->limitResult('', $options['LIMIT'],
// isset($options['OFFSET']) ? $options['OFFSET']
// : false);
//}
if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $postLimitTail .= ' FOR UPDATE';
if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $postLimitTail .= ' LOCK IN SHARE MODE';
if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
}
public function setTimeout( $timeout ) {
// @todo fixme no-op
}
function ping() {
wfDebug( "Function ping() not written for DatabasePostgres.php yet");
return true;
}
/**
* How lagged is this slave?
*
*/
public function getLag() {
# Not implemented for PostgreSQL
return false;
}
} // end DatabasePostgres class