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+<?php
+
+/**
+ * @file
+ * Database interface code for engines that need complete control over their
+ * result sets. For example, SQLite will prefix some column names by the name
+ * of the table. We post-process the data, by renaming the column names
+ * using the same convention as MySQL and PostgreSQL.
+ */
+
+/**
+ * @addtogroup database
+ * @{
+ */
+
+/**
+ * An implementation of DatabaseStatementInterface that prefetches all data.
+ *
+ * This class behaves very similar to a PDOStatement but as it always fetches
+ * every row it is possible to manipulate those results.
+ */
+class DatabaseStatementPrefetch implements Iterator, DatabaseStatementInterface {
+
+ /**
+ * The query string.
+ *
+ * @var string
+ */
+ protected $queryString;
+
+ /**
+ * Driver-specific options. Can be used by child classes.
+ *
+ * @var Array
+ */
+ protected $driverOptions;
+
+ /**
+ * Reference to the database connection object for this statement.
+ *
+ * The name $dbh is inherited from PDOStatement.
+ *
+ * @var DatabaseConnection
+ */
+ public $dbh;
+
+ /**
+ * Main data store.
+ *
+ * @var Array
+ */
+ protected $data = array();
+
+ /**
+ * The current row, retrieved in PDO::FETCH_ASSOC format.
+ *
+ * @var Array
+ */
+ protected $currentRow = NULL;
+
+ /**
+ * The key of the current row.
+ *
+ * @var int
+ */
+ protected $currentKey = NULL;
+
+ /**
+ * The list of column names in this result set.
+ *
+ * @var Array
+ */
+ protected $columnNames = NULL;
+
+ /**
+ * The number of rows affected by the last query.
+ *
+ * @var int
+ */
+ protected $rowCount = NULL;
+
+ /**
+ * The number of rows in this result set.
+ *
+ * @var int
+ */
+ protected $resultRowCount = 0;
+
+ /**
+ * Holds the current fetch style (which will be used by the next fetch).
+ * @see PDOStatement::fetch()
+ *
+ * @var int
+ */
+ protected $fetchStyle = PDO::FETCH_OBJ;
+
+ /**
+ * Holds supplementary current fetch options (which will be used by the next fetch).
+ *
+ * @var Array
+ */
+ protected $fetchOptions = array(
+ 'class' => 'stdClass',
+ 'constructor_args' => array(),
+ 'object' => NULL,
+ 'column' => 0,
+ );
+
+ /**
+ * Holds the default fetch style.
+ *
+ * @var int
+ */
+ protected $defaultFetchStyle = PDO::FETCH_OBJ;
+
+ /**
+ * Holds supplementary default fetch options.
+ *
+ * @var Array
+ */
+ protected $defaultFetchOptions = array(
+ 'class' => 'stdClass',
+ 'constructor_args' => array(),
+ 'object' => NULL,
+ 'column' => 0,
+ );
+
+ public function __construct(DatabaseConnection $connection, $query, array $driver_options = array()) {
+ $this->dbh = $connection;
+ $this->queryString = $query;
+ $this->driverOptions = $driver_options;
+ }
+
+ /**
+ * Executes a prepared statement.
+ *
+ * @param $args
+ * An array of values with as many elements as there are bound parameters in the SQL statement being executed.
+ * @param $options
+ * An array of options for this query.
+ * @return
+ * TRUE on success, or FALSE on failure.
+ */
+ public function execute($args = array(), $options = array()) {
+ if (isset($options['fetch'])) {
+ if (is_string($options['fetch'])) {
+ // Default to an object. Note: db fields will be added to the object
+ // before the constructor is run. If you need to assign fields after
+ // the constructor is run, see http://drupal.org/node/315092.
+ $this->setFetchMode(PDO::FETCH_CLASS, $options['fetch']);
+ }
+ else {
+ $this->setFetchMode($options['fetch']);
+ }
+ }
+
+ $logger = $this->dbh->getLogger();
+ if (!empty($logger)) {
+ $query_start = microtime(TRUE);
+ }
+
+ // Prepare the query.
+ $statement = $this->getStatement($this->queryString, $args);
+ if (!$statement) {
+ $this->throwPDOException();
+ }
+
+ $return = $statement->execute($args);
+ if (!$return) {
+ $this->throwPDOException();
+ }
+
+ // Fetch all the data from the reply, in order to release any lock
+ // as soon as possible.
+ $this->rowCount = $statement->rowCount();
+ $this->data = $statement->fetchAll(PDO::FETCH_ASSOC);
+ // Destroy the statement as soon as possible. See
+ // DatabaseConnection_sqlite::PDOPrepare() for explanation.
+ unset($statement);
+
+ $this->resultRowCount = count($this->data);
+
+ if ($this->resultRowCount) {
+ $this->columnNames = array_keys($this->data[0]);
+ }
+ else {
+ $this->columnNames = array();
+ }
+
+ if (!empty($logger)) {
+ $query_end = microtime(TRUE);
+ $logger->log($this, $args, $query_end - $query_start);
+ }
+
+ // Initialize the first row in $this->currentRow.
+ $this->next();
+
+ return $return;
+ }
+
+ /**
+ * Throw a PDO Exception based on the last PDO error.
+ */
+ protected function throwPDOException() {
+ $error_info = $this->dbh->errorInfo();
+ // We rebuild a message formatted in the same way as PDO.
+ $exception = new PDOException("SQLSTATE[" . $error_info[0] . "]: General error " . $error_info[1] . ": " . $error_info[2]);
+ $exception->errorInfo = $error_info;
+ throw $exception;
+ }
+
+ /**
+ * Grab a PDOStatement object from a given query and its arguments.
+ *
+ * Some drivers (including SQLite) will need to perform some preparation
+ * themselves to get the statement right.
+ *
+ * @param $query
+ * The query.
+ * @param array $args
+ * An array of arguments.
+ * @return PDOStatement
+ * A PDOStatement object.
+ */
+ protected function getStatement($query, &$args = array()) {
+ return $this->dbh->prepare($query);
+ }
+
+ /**
+ * Return the object's SQL query string.
+ */
+ public function getQueryString() {
+ return $this->queryString;
+ }
+
+ /**
+ * @see PDOStatement::setFetchMode()
+ */
+ public function setFetchMode($fetchStyle, $a2 = NULL, $a3 = NULL) {
+ $this->defaultFetchStyle = $fetchStyle;
+ switch ($fetchStyle) {
+ case PDO::FETCH_CLASS:
+ $this->defaultFetchOptions['class'] = $a2;
+ if ($a3) {
+ $this->defaultFetchOptions['constructor_args'] = $a3;
+ }
+ break;
+ case PDO::FETCH_COLUMN:
+ $this->defaultFetchOptions['column'] = $a2;
+ break;
+ case PDO::FETCH_INTO:
+ $this->defaultFetchOptions['object'] = $a2;
+ break;
+ }
+
+ // Set the values for the next fetch.
+ $this->fetchStyle = $this->defaultFetchStyle;
+ $this->fetchOptions = $this->defaultFetchOptions;
+ }
+
+ /**
+ * Return the current row formatted according to the current fetch style.
+ *
+ * This is the core method of this class. It grabs the value at the current
+ * array position in $this->data and format it according to $this->fetchStyle
+ * and $this->fetchMode.
+ *
+ * @return
+ * The current row formatted as requested.
+ */
+ public function current() {
+ if (isset($this->currentRow)) {
+ switch ($this->fetchStyle) {
+ case PDO::FETCH_ASSOC:
+ return $this->currentRow;
+ case PDO::FETCH_BOTH:
+ // PDO::FETCH_BOTH returns an array indexed by both the column name
+ // and the column number.
+ return $this->currentRow + array_values($this->currentRow);
+ case PDO::FETCH_NUM:
+ return array_values($this->currentRow);
+ case PDO::FETCH_LAZY:
+ // We do not do lazy as everything is fetched already. Fallback to
+ // PDO::FETCH_OBJ.
+ case PDO::FETCH_OBJ:
+ return (object) $this->currentRow;
+ case PDO::FETCH_CLASS | PDO::FETCH_CLASSTYPE:
+ $class_name = array_unshift($this->currentRow);
+ // Deliberate no break.
+ case PDO::FETCH_CLASS:
+ if (!isset($class_name)) {
+ $class_name = $this->fetchOptions['class'];
+ }
+ if (count($this->fetchOptions['constructor_args'])) {
+ $reflector = new ReflectionClass($class_name);
+ $result = $reflector->newInstanceArgs($this->fetchOptions['constructor_args']);
+ }
+ else {
+ $result = new $class_name();
+ }
+ foreach ($this->currentRow as $k => $v) {
+ $result->$k = $v;
+ }
+ return $result;
+ case PDO::FETCH_INTO:
+ foreach ($this->currentRow as $k => $v) {
+ $this->fetchOptions['object']->$k = $v;
+ }
+ return $this->fetchOptions['object'];
+ case PDO::FETCH_COLUMN:
+ if (isset($this->columnNames[$this->fetchOptions['column']])) {
+ return $this->currentRow[$k][$this->columnNames[$this->fetchOptions['column']]];
+ }
+ else {
+ return;
+ }
+ }
+ }
+ }
+
+ /* Implementations of Iterator. */
+
+ public function key() {
+ return $this->currentKey;
+ }
+
+ public function rewind() {
+ // Nothing to do: our DatabaseStatement can't be rewound.
+ }
+
+ public function next() {
+ if (!empty($this->data)) {
+ $this->currentRow = reset($this->data);
+ $this->currentKey = key($this->data);
+ unset($this->data[$this->currentKey]);
+ }
+ else {
+ $this->currentRow = NULL;
+ }
+ }
+
+ public function valid() {
+ return isset($this->currentRow);
+ }
+
+ /* Implementations of DatabaseStatementInterface. */
+
+ public function rowCount() {
+ return $this->rowCount;
+ }
+
+ public function fetch($fetch_style = NULL, $cursor_orientation = PDO::FETCH_ORI_NEXT, $cursor_offset = NULL) {
+ if (isset($this->currentRow)) {
+ // Set the fetch parameter.
+ $this->fetchStyle = isset($fetch_style) ? $fetch_style : $this->defaultFetchStyle;
+ $this->fetchOptions = $this->defaultFetchOptions;
+
+ // Grab the row in the format specified above.
+ $return = $this->current();
+ // Advance the cursor.
+ $this->next();
+
+ // Reset the fetch parameters to the value stored using setFetchMode().
+ $this->fetchStyle = $this->defaultFetchStyle;
+ $this->fetchOptions = $this->defaultFetchOptions;
+ return $return;
+ }
+ else {
+ return FALSE;
+ }
+ }
+
+ public function fetchColumn($index = 0) {
+ if (isset($this->currentRow) && isset($this->columnNames[$index])) {
+ // We grab the value directly from $this->data, and format it.
+ $return = $this->currentRow[$this->columnNames[$index]];
+ $this->next();
+ return $return;
+ }
+ else {
+ return FALSE;
+ }
+ }
+
+ public function fetchField($index = 0) {
+ return $this->fetchColumn($index);
+ }
+
+ public function fetchObject($class_name = NULL, $constructor_args = array()) {
+ if (isset($this->currentRow)) {
+ if (!isset($class_name)) {
+ // Directly cast to an object to avoid a function call.
+ $result = (object) $this->currentRow;
+ }
+ else {
+ $this->fetchStyle = PDO::FETCH_CLASS;
+ $this->fetchOptions = array('constructor_args' => $constructor_args);
+ // Grab the row in the format specified above.
+ $result = $this->current();
+ // Reset the fetch parameters to the value stored using setFetchMode().
+ $this->fetchStyle = $this->defaultFetchStyle;
+ $this->fetchOptions = $this->defaultFetchOptions;
+ }
+
+ $this->next();
+
+ return $result;
+ }
+ else {
+ return FALSE;
+ }
+ }
+
+ public function fetchAssoc() {
+ if (isset($this->currentRow)) {
+ $result = $this->currentRow;
+ $this->next();
+ return $result;
+ }
+ else {
+ return FALSE;
+ }
+ }
+
+ public function fetchAll($fetch_style = NULL, $fetch_column = NULL, $constructor_args = NULL) {
+ $this->fetchStyle = isset($fetch_style) ? $fetch_style : $this->defaultFetchStyle;
+ $this->fetchOptions = $this->defaultFetchOptions;
+ if (isset($fetch_column)) {
+ $this->fetchOptions['column'] = $fetch_column;
+ }
+ if (isset($constructor_args)) {
+ $this->fetchOptions['constructor_args'] = $constructor_args;
+ }
+
+ $result = array();
+ // Traverse the array as PHP would have done.
+ while (isset($this->currentRow)) {
+ // Grab the row in the format specified above.
+ $result[] = $this->current();
+ $this->next();
+ }
+
+ // Reset the fetch parameters to the value stored using setFetchMode().
+ $this->fetchStyle = $this->defaultFetchStyle;
+ $this->fetchOptions = $this->defaultFetchOptions;
+ return $result;
+ }
+
+ public function fetchCol($index = 0) {
+ if (isset($this->columnNames[$index])) {
+ $column = $this->columnNames[$index];
+ $result = array();
+ // Traverse the array as PHP would have done.
+ while (isset($this->currentRow)) {
+ $result[] = $this->currentRow[$this->columnNames[$index]];
+ $this->next();
+ }
+ return $result;
+ }
+ else {
+ return array();
+ }
+ }
+
+ public function fetchAllKeyed($key_index = 0, $value_index = 1) {
+ if (!isset($this->columnNames[$key_index]) || !isset($this->columnNames[$value_index]))
+ return array();
+
+ $key = $this->columnNames[$key_index];
+ $value = $this->columnNames[$value_index];
+
+ $result = array();
+ // Traverse the array as PHP would have done.
+ while (isset($this->currentRow)) {
+ $result[$this->currentRow[$key]] = $this->currentRow[$value];
+ $this->next();
+ }
+ return $result;
+ }
+
+ public function fetchAllAssoc($key, $fetch_style = NULL) {
+ $this->fetchStyle = isset($fetch_style) ? $fetch_style : $this->defaultFetchStyle;
+ $this->fetchOptions = $this->defaultFetchOptions;
+
+ $result = array();
+ // Traverse the array as PHP would have done.
+ while (isset($this->currentRow)) {
+ // Grab the row in its raw PDO::FETCH_ASSOC format.
+ $row = $this->currentRow;
+ // Grab the row in the format specified above.
+ $result_row = $this->current();
+ $result[$this->currentRow[$key]] = $result_row;
+ $this->next();
+ }
+
+ // Reset the fetch parameters to the value stored using setFetchMode().
+ $this->fetchStyle = $this->defaultFetchStyle;
+ $this->fetchOptions = $this->defaultFetchOptions;
+ return $result;
+ }
+
+}
+
+/**
+ * @} End of "addtogroup database".
+ */
+