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|
<?php
// $Id$
/**
* @file
* Database interface code for PostgreSQL database servers.
*/
/**
* @ingroup database
* @{
*/
class DatabaseConnection_pgsql extends DatabaseConnection {
protected $transactionSupport;
//protected $lastInsertInfo = NULL;
public function __construct(Array $connection_options = array()) {
$connection_options += array(
'transactions' => TRUE,
);
$this->transactionSupport = $connection_options['transactions'];
$dsn = 'pgsql:host=' . $connection_options['host'] . ' dbname=' . $connection_options['database'];
if (!empty($connection_options['port'])) {
$dsn .= ' port=' . $connection_options['port'];
}
parent::__construct($dsn, $connection_options['username'], $connection_options['password'], array(PDO::ATTR_STRINGIFY_FETCHES => TRUE));
}
public function query($query, Array $args = array(), $options = array()) {
$options += $this->defaultOptions();
try {
if ($query instanceof DatabaseStatement) {
$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 $e) {
if (!function_exists('module_implements')) {
_db_need_install();
}
//watchdog('database', var_export($e, TRUE) . $e->getMessage(), NULL, WATCHDOG_ERROR);
if ($options['throw_exception']) {
if ($query instanceof DatabaseStatement) {
$query_string = $stmt->queryString;
}
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) {
// Backward compatibility hack, temporary.
$query = str_replace(array('%d' , '%f' , '%b' , "'%s'"), '?', $query);
return $this->query($query . ' LIMIT ' . $count . ' OFFSET ' . $from, $args, $options);
}
public function queryTemporary($query, Array $args, $tablename) {
$query = preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE ' . $tablename . ' Engine=HEAP SELECT', $this->prefixTables($query));
return $this->query($query, $args, $options);
}
public function driver() {
return 'pgsql';
}
public function databaseType() {
return 'pgsql';
}
public function supportsTransactions() {
return $this->transactionSupport;
}
public function escapeTable($table) {
return preg_replace('/[^A-Za-z0-9_]+/', '', $table);
}
public function mapConditionOperator($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".
*/
|
