Commit 1731cd48 authored by alexpott's avatar alexpott

Issue #2465633 by amateescu: Bring back the custom Statement class for the SQLite driver

parent ce498b91
......@@ -52,6 +52,10 @@ class Connection extends DatabaseConnection {
* Constructs a \Drupal\Core\Database\Driver\sqlite\Connection object.
*/
public function __construct(\PDO $connection, array $connection_options) {
// We don't need a specific PDOStatement class here, we simulate it in
// static::prepare().
$this->statementClass = NULL;
parent::__construct($connection, $connection_options);
// This driver defaults to transaction support, except if explicitly passed FALSE.
......@@ -255,69 +259,8 @@ public static function sqlFunctionRegexp($pattern, $subject) {
/**
* {@inheritdoc}
*/
protected function expandArguments(&$query, &$args) {
$modified = parent::expandArguments($query, $args);
// The PDO SQLite driver always replaces placeholders with strings, which
// breaks numeric expressions (e.g., COUNT(*) >= :count). Replace numeric
// placeholders in the query to work around this bug.
// @see http://bugs.php.net/bug.php?id=45259
if (empty($args)) {
return $modified;
}
// Check if $args is a simple numeric array.
if (range(0, count($args) - 1) === array_keys($args)) {
// In that case, we have unnamed placeholders.
$count = 0;
$new_args = array();
foreach ($args as $value) {
if (is_float($value) || is_int($value) || is_numeric($value)) {
if (is_float($value)) {
// Force the conversion to float so as not to loose precision
// in the automatic cast.
$value = sprintf('%F', $value);
}
$query = substr_replace($query, $value, strpos($query, '?'), 1);
}
else {
$placeholder = ':db_statement_placeholder_' . $count++;
$query = substr_replace($query, $placeholder, strpos($query, '?'), 1);
$new_args[$placeholder] = $value;
}
}
$args = $new_args;
$modified = TRUE;
}
// Otherwise this is using named placeholders.
else {
foreach ($args as $placeholder => $value) {
if (is_float($value) || is_int($value) || is_numeric($value)) {
if (is_float($value)) {
// Force the conversion to float so as not to loose precision
// in the automatic cast.
$value = sprintf('%F', $value);
}
// We will remove this placeholder from the query as PDO throws an
// exception if the number of placeholders in the query and the
// arguments does not match.
unset($args[$placeholder]);
// PDO allows placeholders to not be prefixed by a colon. See
// http://marc.info/?l=php-internals&m=111234321827149&w=2 for
// more.
if ($placeholder[0] != ':') {
$placeholder = ":$placeholder";
}
// When replacing the placeholders, make sure we search for the
// exact placeholder. For example, if searching for
// ':db_placeholder_1', do not replace ':db_placeholder_11'.
$query = preg_replace('/' . preg_quote($placeholder, '/') . '\b/', $value, $query);
$modified = TRUE;
}
}
}
return $modified;
public function prepare($statement, array $driver_options = array()) {
return new Statement($this->connection, $this, $statement, $driver_options);
}
/**
......@@ -386,6 +329,13 @@ public function mapConditionOperator($operator) {
return isset($specials[$operator]) ? $specials[$operator] : NULL;
}
/**
* {@inheritdoc}
*/
public function prepareQuery($query) {
return $this->prepare($this->prefixTables($query));
}
public function nextId($existing_id = 0) {
$this->startTransaction();
// We can safely use literal queries here instead of the slower query
......
<?php
/**
* @file
* Definition of Drupal\Core\Database\Driver\sqlite\Statement
*/
namespace Drupal\Core\Database\Driver\sqlite;
use Drupal\Core\Database\StatementPrefetch;
use Drupal\Core\Database\StatementInterface;
/**
* Specific SQLite implementation of DatabaseConnection.
*
* The PDO SQLite driver only closes SELECT statements when the PDOStatement
* destructor is called and SQLite does not allow data change (INSERT,
* UPDATE etc) on a table which has open SELECT statements. This is a
* user-space mock of PDOStatement that buffers all the data and doesn't
* have those limitations.
*/
class Statement extends StatementPrefetch implements StatementInterface {
/**
* SQLite specific implementation of getStatement().
*
* The PDO SQLite layer doesn't replace numeric placeholders in queries
* correctly, and this makes numeric expressions (such as COUNT(*) >= :count)
* fail. We replace numeric placeholders in the query ourselves to work
* around this bug.
*
* See http://bugs.php.net/bug.php?id=45259 for more details.
*/
protected function getStatement($query, &$args = array()) {
if (count($args)) {
// Check if $args is a simple numeric array.
if (range(0, count($args) - 1) === array_keys($args)) {
// In that case, we have unnamed placeholders.
$count = 0;
$new_args = array();
foreach ($args as $value) {
if (is_float($value) || is_int($value)) {
if (is_float($value)) {
// Force the conversion to float so as not to loose precision
// in the automatic cast.
$value = sprintf('%F', $value);
}
$query = substr_replace($query, $value, strpos($query, '?'), 1);
}
else {
$placeholder = ':db_statement_placeholder_' . $count++;
$query = substr_replace($query, $placeholder, strpos($query, '?'), 1);
$new_args[$placeholder] = $value;
}
}
$args = $new_args;
}
else {
// Else, this is using named placeholders.
foreach ($args as $placeholder => $value) {
if (is_float($value) || is_int($value)) {
if (is_float($value)) {
// Force the conversion to float so as not to loose precision
// in the automatic cast.
$value = sprintf('%F', $value);
}
// We will remove this placeholder from the query as PDO throws an
// exception if the number of placeholders in the query and the
// arguments does not match.
unset($args[$placeholder]);
// PDO allows placeholders to not be prefixed by a colon. See
// http://marc.info/?l=php-internals&m=111234321827149&w=2 for
// more.
if ($placeholder[0] != ':') {
$placeholder = ":$placeholder";
}
// When replacing the placeholders, make sure we search for the
// exact placeholder. For example, if searching for
// ':db_placeholder_1', do not replace ':db_placeholder_11'.
$query = preg_replace('/' . preg_quote($placeholder) . '\b/', $value, $query);
}
}
}
}
return $this->dbh->prepare($query);
}
public function execute($args = array(), $options = array()) {
try {
$return = parent::execute($args, $options);
}
catch (\PDOException $e) {
if (!empty($e->errorInfo[1]) && $e->errorInfo[1] === 17) {
// The schema has changed. SQLite specifies that we must resend the query.
$return = parent::execute($args, $options);
}
else {
// Rethrow the exception.
throw $e;
}
}
// In some weird cases, 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.
$rename_columns = array();
foreach ($this->columnNames as $k => $column) {
// In some SQLite versions, SELECT DISTINCT(field) will return "(field)"
// instead of "field".
if (preg_match("/^\((.*)\)$/", $column, $matches)) {
$rename_columns[$column] = $matches[1];
$this->columnNames[$k] = $matches[1];
$column = $matches[1];
}
// Remove "table." prefixes.
if (preg_match("/^.*\.(.*)$/", $column, $matches)) {
$rename_columns[$column] = $matches[1];
$this->columnNames[$k] = $matches[1];
}
}
if ($rename_columns) {
// DatabaseStatementPrefetch already extracted the first row,
// put it back into the result set.
if (isset($this->currentRow)) {
$this->data[0] = &$this->currentRow;
}
// Then rename all the columns across the result set.
foreach ($this->data as $k => $row) {
foreach ($rename_columns as $old_column => $new_column) {
$this->data[$k][$new_column] = $this->data[$k][$old_column];
unset($this->data[$k][$old_column]);
}
}
// Finally, extract the first row again.
$this->currentRow = $this->data[0];
unset($this->data[0]);
}
return $return;
}
}
......@@ -187,8 +187,8 @@ public function execute($args = array(), $options = array()) {
// Fetch all the data from the reply, in order to release any lock
// as soon as possible.
$this->data = $statement->fetchAll(\PDO::FETCH_ASSOC);
// Destroy the statement as soon as possible. See
// DatabaseConnection_sqlite::PDOPrepare() for explanation.
// Destroy the statement as soon as possible. See the documentation of
// \Drupal\Core\Database\Driver\sqlite\Statement for an explanation.
unset($statement);
$this->resultRowCount = count($this->data);
......
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