From 36f15a52b419beb60f5a8bf271c2b334770c1f9a Mon Sep 17 00:00:00 2001
From: Ingo Schommer <ingo@silverstripe.com>
Date: Tue, 11 Dec 2012 01:43:37 +0100
Subject: [PATCH] BUG Using GLOB for case sensitive matches in SQLite3

As opposed to LIKE, the GLOB operator is case sensitive by default
in SQlite3. It uses "*" instead of "%" for wildcards,
which necessitated a new SearchFilter->getWildcard() method.

SQlite3 doesn't support per-term modifiers,
COLLATE BINARY LIKE is case insensitive by default
unless the field collation is set up accordingly.
There's connection-level modifiers (PRAGMA case_sensitive_like = true),
but that would affect all comparisators in the executed query.
---
 code/SQLite3Database.php | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/code/SQLite3Database.php b/code/SQLite3Database.php
index 3e13efb..6d530d8 100644
--- a/code/SQLite3Database.php
+++ b/code/SQLite3Database.php
@@ -1076,6 +1076,37 @@ class SQLite3Database extends SS_Database {
 		return true;
 	}
 
+	/**
+	 * Generate a WHERE clause for text matching.
+	 * 
+	 * @param String $field Quoted field name
+	 * @param String $value Escaped search. Can include percentage wildcards.
+	 * @param boolean $exact Exact matches or wildcard support.
+	 * @param boolean $negate Negate the clause.
+	 * @param boolean $caseSensitive Enforce case sensitivity if TRUE or FALSE.
+	 *                               Stick with default collation if set to NULL.
+	 * @return String SQL
+	 */
+	public function comparisonClause($field, $value, $exact = false, $negate = false, $caseSensitive = null) {
+		if($exact && !$caseSensitive) {
+			$comp = ($negate) ? '!=' : '=';
+		} else {
+			if($caseSensitive) {
+				// GLOB uses asterisks as wildcards.
+				// Replace them in search string, without replacing escaped percetage signs.
+				$comp = 'GLOB';
+				$value = preg_replace('/^%([^\\\\])/', '*$1', $value);
+				$value = preg_replace('/([^\\\\])%$/', '$1*', $value);
+				$value = preg_replace('/([^\\\\])%/', '$1*', $value);
+			} else {
+				$comp = 'LIKE';
+			}
+			if($negate) $comp = 'NOT ' . $comp;
+		}
+		
+		return sprintf("%s %s '%s'", $field, $comp, $value);
+	}
+
 	/**
 	 * Function to return an SQL datetime expression that can be used with SQLite3
 	 * used for querying a datetime in a certain format