From fe2eecace037ea1abf78b16130e5826832e95c7d Mon Sep 17 00:00:00 2001
From: Nathaniel Catchpole <catch@35733.no-reply.drupal.org>
Date: Thu, 21 May 2015 13:05:34 +0100
Subject: [PATCH] Issue #2475187 by amateescu: Add a user-space implementation
for LIKE BINARY in SQLite
---
.../Database/Driver/sqlite/Connection.php | 26 +++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
index 69103bef8964..247d6532a054 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
@@ -112,6 +112,12 @@ public static function open(array &$connection_options = array()) {
$pdo->sqliteCreateFunction('rand', array(__CLASS__, 'sqlFunctionRand'));
$pdo->sqliteCreateFunction('regexp', array(__CLASS__, 'sqlFunctionRegexp'));
+ // SQLite does not support the LIKE BINARY operator, so we overload the
+ // non-standard GLOB operator for case-sensitive matching. Another option
+ // would have been to override another non-standard operator, MATCH, but
+ // that does not support the NOT keyword prefix.
+ $pdo->sqliteCreateFunction('glob', array(__CLASS__, 'sqlFunctionLikeBinary'));
+
// Create a user-space case-insensitive collation with UTF-8 support.
$pdo->sqliteCreateCollation('NOCASE_UTF8', array('Drupal\Component\Utility\Unicode', 'strcasecmp'));
@@ -256,6 +262,24 @@ public static function sqlFunctionRegexp($pattern, $subject) {
return preg_match($pattern, $subject);
}
+ /**
+ * SQLite compatibility implementation for the LIKE BINARY SQL operator.
+ *
+ * SQLite supports case-sensitive LIKE operations through the
+ * 'case_sensitive_like' PRAGMA statement, but only for ASCII characters, so
+ * we have to provide our own implementation with UTF-8 support.
+ *
+ * @see https://sqlite.org/pragma.html#pragma_case_sensitive_like
+ * @see https://sqlite.org/lang_expr.html#like
+ */
+ public static function sqlFunctionLikeBinary($pattern, $subject) {
+ // Replace the SQL LIKE wildcard meta-characters with the equivalent regular
+ // expression meta-characters and escape the delimiter that will be used for
+ // matching.
+ $pattern = str_replace(array('%', '_'), array('.*?', '.'), preg_quote($pattern, '/'));
+ return preg_match('/^' . $pattern . '$/', $subject);
+ }
+
/**
* {@inheritdoc}
*/
@@ -325,6 +349,8 @@ public function mapConditionOperator($operator) {
static $specials = array(
'LIKE' => array('postfix' => " ESCAPE '\\'"),
'NOT LIKE' => array('postfix' => " ESCAPE '\\'"),
+ 'LIKE BINARY' => array('postfix' => " ESCAPE '\\'", 'operator' => 'GLOB'),
+ 'NOT LIKE BINARY' => array('postfix' => " ESCAPE '\\'", 'operator' => 'NOT GLOB'),
);
return isset($specials[$operator]) ? $specials[$operator] : NULL;
}
--
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