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+<?php
+
+/**
+ * @file
+ * Database interface code for PostgreSQL database servers.
+ */
+
+/**
+ * @addtogroup database
+ * @{
+ */
+
+/**
+ * The name by which to obtain a lock for retrive the next insert id.
+ */
+define('POSTGRESQL_NEXTID_LOCK', 1000);
+
+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);
+
+ // Transactional DDL is always available in PostgreSQL,
+ // but we'll only enable it if standard transactions are.
+ $this->transactionalDDLSupport = $this->transactionSupport;
+
+ // Default to TCP connection on port 5432.
+ if (empty($connection_options['port'])) {
+ $connection_options['port'] = 5432;
+ }
+
+ // PostgreSQL in trust mode doesn't require a password to be supplied.
+ if (empty($connection_options['password'])) {
+ $connection_options['password'] = NULL;
+ }
+ // If the password contains a backslash it is treated as an escape character
+ // http://bugs.php.net/bug.php?id=53217
+ // so backslashes in the password need to be doubled up.
+ // The bug was reported against pdo_pgsql 1.0.2, backslashes in passwords
+ // will break on this doubling up when the bug is fixed, so check the version
+ //elseif (phpversion('pdo_pgsql') < 'version_this_was_fixed_in') {
+ else {
+ $connection_options['password'] = str_replace('\\', '\\\\', $connection_options['password']);
+ }
+
+ $this->connectionOptions = $connection_options;
+
+ $dsn = 'pgsql:host=' . $connection_options['host'] . ' dbname=' . $connection_options['database'] . ' port=' . $connection_options['port'];
+
+ // Allow PDO options to be overridden.
+ $connection_options += array(
+ 'pdo' => array(),
+ );
+ $connection_options['pdo'] += array(
+ // Prepared statements are most effective for performance when queries
+ // are recycled (used several times). However, if they are not re-used,
+ // prepared statements become ineffecient. Since most of Drupal's
+ // prepared queries are not re-used, it should be faster to emulate
+ // the preparation than to actually ready statements for re-use. If in
+ // doubt, reset to FALSE and measure performance.
+ PDO::ATTR_EMULATE_PREPARES => TRUE,
+ // Convert numeric values to strings when fetching.
+ PDO::ATTR_STRINGIFY_FETCHES => TRUE,
+ );
+ parent::__construct($dsn, $connection_options['username'], $connection_options['password'], $connection_options['pdo']);
+
+ // Force PostgreSQL to use the UTF-8 character set by default.
+ $this->exec("SET NAMES 'UTF8'");
+
+ // Execute PostgreSQL init_commands.
+ if (isset($connection_options['init_commands'])) {
+ $this->exec(implode('; ', $connection_options['init_commands']));
+ }
+ }
+
+ public function prepareQuery($query) {
+ // mapConditionOperator converts LIKE operations to ILIKE for consistency
+ // with MySQL. However, Postgres does not support ILIKE on bytea (blobs)
+ // fields.
+ // To make the ILIKE operator work, we type-cast bytea fields into text.
+ // @todo This workaround only affects bytea fields, but the involved field
+ // types involved in the query are unknown, so there is no way to
+ // conditionally execute this for affected queries only.
+ return parent::prepareQuery(preg_replace('/ ([^ ]+) +(I*LIKE|NOT +I*LIKE) /i', ' ${1}::text ${2} ', $query));
+ }
+
+ public function query($query, array $args = array(), $options = array()) {
+
+ $options += $this->defaultOptions();
+
+ // The PDO PostgreSQL driver has a bug which
+ // doesn't type cast booleans correctly when
+ // parameters are bound using associative
+ // arrays.
+ // See http://bugs.php.net/bug.php?id=48383
+ foreach ($args as &$value) {
+ if (is_bool($value)) {
+ $value = (int) $value;
+ }
+ }
+
+ try {
+ if ($query instanceof DatabaseStatementInterface) {
+ $stmt = $query;
+ $stmt->execute(NULL, $options);
+ }
+ else {
+ $this->expandArguments($query, $args);
+ $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 $e) {
+ if ($options['throw_exception']) {
+ // Add additional debug information.
+ if ($query instanceof DatabaseStatementInterface) {
+ $e->query_string = $stmt->getQueryString();
+ }
+ else {
+ $e->query_string = $query;
+ }
+ $e->args = $args;
+ throw $e;
+ }
+ return NULL;
+ }
+ }
+
+ public function queryRange($query, $from, $count, array $args = array(), array $options = array()) {
+ return $this->query($query . ' LIMIT ' . (int) $count . ' OFFSET ' . (int) $from, $args, $options);
+ }
+
+ public function queryTemporary($query, array $args = array(), array $options = array()) {
+ $tablename = $this->generateTemporaryTableName();
+ $this->query(preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE {' . $tablename . '} AS SELECT', $query), $args, $options);
+ return $tablename;
+ }
+
+ public function driver() {
+ return 'pgsql';
+ }
+
+ public function databaseType() {
+ return 'pgsql';
+ }
+
+ public function mapConditionOperator($operator) {
+ static $specials;
+
+ // Function calls not allowed in static declarations, thus this method.
+ if (!isset($specials)) {
+ $specials = array(
+ // In PostgreSQL, 'LIKE' is case-sensitive. For case-insensitive LIKE
+ // statements, we need to use ILIKE instead.
+ 'LIKE' => array('operator' => 'ILIKE'),
+ 'NOT LIKE' => array('operator' => 'NOT ILIKE'),
+ );
+ }
+
+ return isset($specials[$operator]) ? $specials[$operator] : NULL;
+ }
+
+ /**
+ * Retrive a the next id in a sequence.
+ *
+ * PostgreSQL has built in sequences. We'll use these instead of inserting
+ * and updating a sequences table.
+ */
+ public function nextId($existing = 0) {
+
+ // Retrive the name of the sequence. This information cannot be cached
+ // because the prefix may change, for example, like it does in simpletests.
+ $sequence_name = $this->makeSequenceName('sequences', 'value');
+
+ // When PostgreSQL gets a value too small then it will lock the table,
+ // retry the INSERT and if it's still too small then alter the sequence.
+ $id = $this->query("SELECT nextval('" . $sequence_name . "')")->fetchField();
+ if ($id > $existing) {
+ return $id;
+ }
+
+ // PostgreSQL advisory locks are simply locks to be used by an
+ // application such as Drupal. This will prevent other Drupal proccesses
+ // from altering the sequence while we are.
+ $this->query("SELECT pg_advisory_lock(" . POSTGRESQL_NEXTID_LOCK . ")");
+
+ // While waiting to obtain the lock, the sequence may have been altered
+ // so lets try again to obtain an adequate value.
+ $id = $this->query("SELECT nextval('" . $sequence_name . "')")->fetchField();
+ if ($id > $existing) {
+ $this->query("SELECT pg_advisory_unlock(" . POSTGRESQL_NEXTID_LOCK . ")");
+ return $id;
+ }
+
+ // Reset the sequence to a higher value than the existing id.
+ $this->query("ALTER SEQUENCE " . $sequence_name . " RESTART WITH " . ($existing + 1));
+
+ // Retrive the next id. We know this will be as high as we want it.
+ $id = $this->query("SELECT nextval('" . $sequence_name . "')")->fetchField();
+
+ $this->query("SELECT pg_advisory_unlock(" . POSTGRESQL_NEXTID_LOCK . ")");
+
+ return $id;
+ }
+}
+
+/**
+ * @} End of "addtogroup database".
+ */