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<?php
// $Id$
/**
* @file
* Install functions for PostgreSQL embedded database engine.
*/
// PostgreSQL specific install functions
class DatabaseTasks_pgsql extends DatabaseTasks {
protected $pdoDriver = 'pgsql';
public function __construct() {
$this->tasks[] = array(
'function' => 'checkEncoding',
'arguments' => array(),
);
$this->tasks[] = array(
'function' => 'checkPHPVersion',
'arguments' => array(),
);
$this->tasks[] = array(
'function' => 'checkBinaryOutput',
'arguments' => array(),
);
$this->tasks[] = array(
'function' => 'initializeDatabase',
'arguments' => array(),
);
}
public function name() {
return st('PostgreSQL');
}
public function minimumVersion() {
return '8.3';
}
/**
* Check encoding is UTF8.
*/
protected function checkEncoding() {
try {
if (db_query('SHOW server_encoding')->fetchField() == 'UTF8') {
$this->pass(st('Database is encoded in UTF-8'));
}
else {
$replacements = array(
'%encoding' => 'UTF8',
'%driver' => $this->name(),
'!link' => '<a href="INSTALL.pgsql.txt">INSTALL.pgsql.txt</a>'
);
$text = 'The %driver database must use %encoding encoding to work with Drupal.';
$text .= 'Recreate the database with %encoding encoding. See !link for more details.';
$this->fail(st($text, $replacements));
}
}
catch (Exception $e) {
$this->fail(st('Drupal could not determine the encoding of the database was set to UTF-8'));
}
}
/**
* Check PHP version.
*
* There are two bugs in PDO_pgsql affecting Drupal:
*
* - in versions < 5.2.7, PDO_pgsql refuses to insert an empty string into
* a NOT NULL BLOB column. See: http://bugs.php.net/bug.php?id=46249
* - in versions < 5.2.11 and < 5.3.1 that prevents inserting integer values
* into numeric columns that exceed the PHP_INT_MAX value.
* See: http://bugs.php.net/bug.php?id=48924
*/
function checkPHPVersion() {
if (!version_compare(PHP_VERSION, '5.2.11', '>=') || (version_compare(PHP_VERSION, '5.3.0', '>=') && !version_compare(PHP_VERSION, '5.3.1', '>='))) {
$this->fail(st('The version of PHP you are using has known issues with PostgreSQL. You need to upgrade PHP to 5.2.11, 5.3.1 or greater.'));
};
}
/**
* Check Binary Output.
*
* Unserializing does not work on Postgresql 9 when bytea_output is 'hex'.
*/
function checkBinaryOutput() {
// PostgreSQL < 9 doesn't support bytea_output, so verify we are running
// at least PostgreSQL 9.
$database_connection = Database::getConnection();
if (version_compare($database_connection->version(), '9') >= 0) {
if (!$this->checkBinaryOutputSuccess()) {
// First try to alter the database. If it fails, raise an error telling
// the user to do it themselves.
$connection_options = $database_connection->getConnectionOptions();
// It is safe to include the database name directly here, because this
// code is only called when a connection to the database is already
// established, thus the database name is guaranteed to be a correct
// value.
$query = "ALTER DATABASE \"" . $connection_options['database'] . "\" SET bytea_output = 'escape';";
try {
db_query($query);
}
catch (Exception $e) {
// Ignore possible errors when the user doesn't have the necessary
// privileges to ALTER the database.
}
// Close the database connection so that the configuration parameter
// is applied to the current connection.
db_close();
// Recheck, if it fails, finally just rely on the end user to do the
// right thing.
if (!$this->checkBinaryOutputSuccess()) {
$replacements = array(
'%setting' => 'bytea_output',
'%current_value' => 'hex',
'%needed_value' => 'escape',
'!query' => "<code>" . $query . "</code>",
);
$this->fail(st("The %setting setting is currently set to '%current_value', but needs to be '%needed_value'. Change this by running the following query: !query", $replacements));
}
}
}
}
/**
* Verify that a binary data roundtrip returns the original string.
*/
protected function checkBinaryOutputSuccess() {
$bytea_output = db_query("SELECT 'encoding'::bytea AS output")->fetchField();
return ($bytea_output == 'encoding');
}
/**
* Make PostgreSQL Drupal friendly.
*/
function initializeDatabase() {
// We create some functions using global names instead of prefixing them
// like we do with table names. This is so that we don't double up if more
// than one instance of Drupal is running on a single database. We therefore
// avoid trying to create them again in that case.
try {
// Create functions.
db_query('CREATE OR REPLACE FUNCTION "greatest"(numeric, numeric) RETURNS numeric AS
\'SELECT CASE WHEN (($1 > $2) OR ($2 IS NULL)) THEN $1 ELSE $2 END;\'
LANGUAGE \'sql\''
);
db_query('CREATE OR REPLACE FUNCTION "greatest"(numeric, numeric, numeric) RETURNS numeric AS
\'SELECT greatest($1, greatest($2, $3));\'
LANGUAGE \'sql\''
);
// Don't use {} around pg_proc table.
if (!db_query("SELECT COUNT(*) FROM pg_proc WHERE proname = 'rand'")->fetchField()) {
db_query('CREATE OR REPLACE FUNCTION "rand"() RETURNS float AS
\'SELECT random();\'
LANGUAGE \'sql\''
);
}
db_query('CREATE OR REPLACE FUNCTION "substring_index"(text, text, integer) RETURNS text AS
\'SELECT array_to_string((string_to_array($1, $2)) [1:$3], $2);\'
LANGUAGE \'sql\''
);
// Using || to concatenate in Drupal is not recommeneded because there are
// database drivers for Drupal that do not support the syntax, however
// they do support CONCAT(item1, item2) which we can replicate in
// PostgreSQL. PostgreSQL requires the function to be defined for each
// different argument variation the function can handle.
db_query('CREATE OR REPLACE FUNCTION "concat"(anynonarray, anynonarray) RETURNS text AS
\'SELECT CAST($1 AS text) || CAST($2 AS text);\'
LANGUAGE \'sql\'
');
db_query('CREATE OR REPLACE FUNCTION "concat"(text, anynonarray) RETURNS text AS
\'SELECT $1 || CAST($2 AS text);\'
LANGUAGE \'sql\'
');
db_query('CREATE OR REPLACE FUNCTION "concat"(anynonarray, text) RETURNS text AS
\'SELECT CAST($1 AS text) || $2;\'
LANGUAGE \'sql\'
');
db_query('CREATE OR REPLACE FUNCTION "concat"(text, text) RETURNS text AS
\'SELECT $1 || $2;\'
LANGUAGE \'sql\'
');
$this->pass(st('PostgreSQL has initialized itself.'));
}
catch (Exception $e) {
$this->fail(st('Drupal could not be correctly setup with the existing database. Revise any errors.'));
}
}
}
|
