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<?php
// $Id$
/**
* @file
* Database interface code for PostgreSQL database servers.
*/
/**
* @ingroup database
* @{
*/
class DatabaseConnection_pgsql extends DatabaseConnection {
public function __construct(array $connection_options = array()) {
// This driver defaults to transaction support, except if explicitly passed FALSE.
$this->transactionSupport = !isset($connection_options['transactions']) || $connection_options['transactions'] === FALSE;
// Default to TCP connection on port 5432.
if (empty($connection_options['port'])) {
$connection_options['port'] = 5432;
}
$dsn = 'pgsql:host=' . $connection_options['host'] . ' dbname=' . $connection_options['database'] . ' port=' . $connection_options['port'];
parent::__construct($dsn, $connection_options['username'], $connection_options['password'], array(
// Convert numeric values to strings when fetching.
PDO::ATTR_STRINGIFY_FETCHES => TRUE,
// Force column names to lower case.
PDO::ATTR_CASE => PDO::CASE_LOWER,
));
}
public function query($query, array $args = array(), $options = array()) {
$options += $this->defaultOptions();
try {
if ($query instanceof DatabaseStatementInterface) {
$stmt = $query;
$stmt->execute(NULL, $options);
}
else {
$stmt = $this->prepareQuery($query);
$stmt->execute($args, $options);
}
switch ($options['return']) {
case Database::RETURN_STATEMENT:
return $stmt;
case Database::RETURN_AFFECTED:
return $stmt->rowCount();
case Database::RETURN_INSERT_ID:
return $this->lastInsertId($options['sequence_name']);
case Database::RETURN_NULL:
return;
default:
throw new PDOException('Invalid return directive: ' . $options['return']);
}
}
catch (PDOException $e) {
_db_check_install_needed();
if ($options['throw_exception']) {
if ($query instanceof DatabaseStatementInterface) {
$query_string = $stmt->getQueryString();
}
else {
$query_string = $query;
}
throw new PDOException($query_string . " - \n" . print_r($args,1) . $e->getMessage());
}
return NULL;
}
}
public function queryRange($query, array $args, $from, $count, array $options = array()) {
return $this->query($query . ' LIMIT ' . $count . ' OFFSET ' . $from, $args, $options);
}
public function queryTemporary($query, array $args, $tablename, array $options = array()) {
return $this->query(preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE ' . $tablename . ' AS SELECT', $query), $args, $options);
}
public function driver() {
return 'pgsql';
}
public function databaseType() {
return 'pgsql';
}
public function mapConditionOperator($operator) {
static $specials = array(
// In PostgreSQL, 'LIKE' is case-sensitive. For case-insensitive LIKE
// statements, we need to use ILIKE instead.
'LIKE' => array('operator' => 'ILIKE'),
);
return isset($specials[$operator]) ? $specials[$operator] : NULL;
}
/**
* @todo Remove this as soon as db_rewrite_sql() has been exterminated.
*/
public function distinctField($table, $field, $query) {
$field_to_select = 'DISTINCT(' . $table . '.' . $field . ')';
// (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
return preg_replace('/(SELECT.*)(?:' . $table . '\.|\s)(?<!DISTINCT\()(?<!DISTINCT\(' . $table . '\.)' . $field . '(.*FROM )/AUsi', '\1 ' . $field_to_select . '\2', $query);
}
}
/**
* @} End of "ingroup database".
*/
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