7 files changed, 11 insertions, 10 deletions
diff --git a/system/database/DB_forge.php b/system/database/DB_forge.php
index 826aa1ebf..ed6f4b672 100644
--- a/system/database/DB_forge.php
+++ b/system/database/DB_forge.php
@@ -184,7 +184,7 @@ abstract class CI_DB_forge {
 		{
 			return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE;
 		}
-		elseif ( ! $this->db->query(sprintf($this->_create_database, $db_name, $this->db->char_set, $this->db->dbcollat)))
+		elseif ( ! $this->db->query(sprintf($this->_create_database, $this->db->escape_identifiers($db_name), $this->db->char_set, $this->db->dbcollat)))
 		{
 			return ($this->db->db_debug) ? $this->db->display_error('db_unable_to_drop') : FALSE;
 		}
@@ -211,7 +211,7 @@ abstract class CI_DB_forge {
 		{
 			return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE;
 		}
-		elseif ( ! $this->db->query(sprintf($this->_drop_database, $db_name)))
+		elseif ( ! $this->db->query(sprintf($this->_drop_database, $this->db->escape_identifiers($db_name))))
 		{
 			return ($this->db->db_debug) ? $this->db->display_error('db_unable_to_drop') : FALSE;
 		}
diff --git a/system/database/drivers/ibase/ibase_forge.php b/system/database/drivers/ibase/ibase_forge.php
index 9c358c365..b35cc3749 100644
--- a/system/database/drivers/ibase/ibase_forge.php
+++ b/system/database/drivers/ibase/ibase_forge.php
@@ -111,7 +111,7 @@ class CI_DB_ibase_forge extends CI_DB_forge {
 	 * @param	string	$db_name	(ignored)
 	 * @return	bool
 	 */
-	public function drop_database($db_name = '')
+	public function drop_database($db_name)
 	{
 		if ( ! ibase_drop_db($this->conn_id))
 		{
diff --git a/system/database/drivers/pdo/subdrivers/pdo_firebird_forge.php b/system/database/drivers/pdo/subdrivers/pdo_firebird_forge.php
index 256fa1413..50df76905 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_firebird_forge.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_firebird_forge.php
@@ -97,7 +97,7 @@ class CI_DB_pdo_firebird_forge extends CI_DB_pdo_forge {
 	 * @param	string	$db_name	(ignored)
 	 * @return	bool
 	 */
-	public function drop_database($db_name = '')
+	public function drop_database($db_name)
 	{
 		if ( ! ibase_drop_db($this->conn_id))
 		{
diff --git a/system/database/drivers/pdo/subdrivers/pdo_sqlite_forge.php b/system/database/drivers/pdo/subdrivers/pdo_sqlite_forge.php
index f6f9bb481..b124bcad1 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_sqlite_forge.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_sqlite_forge.php
@@ -101,7 +101,7 @@ class CI_DB_pdo_sqlite_forge extends CI_DB_pdo_forge {
 	 * @param	string	$db_name	(ignored)
 	 * @return	bool
 	 */
-	public function create_database($db_name = '')
+	public function create_database($db_name)
 	{
 		// In SQLite, a database is created when you connect to the database.
 		// We'll return TRUE so that an error isn't generated
@@ -116,7 +116,7 @@ class CI_DB_pdo_sqlite_forge extends CI_DB_pdo_forge {
 	 * @param	string	$db_name	(ignored)
 	 * @return	bool
 	 */
-	public function drop_database($db_name = '')
+	public function drop_database($db_name)
 	{
 		// In SQLite, a database is dropped when we delete a file
 		if (file_exists($this->db->database))
diff --git a/system/database/drivers/sqlite/sqlite_forge.php b/system/database/drivers/sqlite/sqlite_forge.php
index 8a1659430..3ad3477e4 100644
--- a/system/database/drivers/sqlite/sqlite_forge.php
+++ b/system/database/drivers/sqlite/sqlite_forge.php
@@ -75,7 +75,7 @@ class CI_DB_sqlite_forge extends CI_DB_forge {
 	 * @param	string	$db_name	(ignored)
 	 * @return	bool
 	 */
-	public function create_database($db_name = '')
+	public function create_database($db_name)
 	{
 		// In SQLite, a database is created when you connect to the database.
 		// We'll return TRUE so that an error isn't generated
@@ -90,7 +90,7 @@ class CI_DB_sqlite_forge extends CI_DB_forge {
 	 * @param	string	$db_name	(ignored)
 	 * @return	bool
 	 */
-	public function drop_database($db_name = '')
+	public function drop_database($db_name)
 	{
 		if ( ! file_exists($this->db->database) OR ! @unlink($this->db->database))
 		{
diff --git a/system/database/drivers/sqlite3/sqlite3_forge.php b/system/database/drivers/sqlite3/sqlite3_forge.php
index 43cbe33e5..c45472f54 100644
--- a/system/database/drivers/sqlite3/sqlite3_forge.php
+++ b/system/database/drivers/sqlite3/sqlite3_forge.php
@@ -87,7 +87,7 @@ class CI_DB_sqlite3_forge extends CI_DB_forge {
 	 * @param	string	$db_name
 	 * @return	bool
 	 */
-	public function create_database($db_name = '')
+	public function create_database($db_name)
 	{
 		// In SQLite, a database is created when you connect to the database.
 		// We'll return TRUE so that an error isn't generated
@@ -102,7 +102,7 @@ class CI_DB_sqlite3_forge extends CI_DB_forge {
 	 * @param	string	$db_name	(ignored)
 	 * @return	bool
 	 */
-	public function drop_database($db_name = '')
+	public function drop_database($db_name)
 	{
 		// In SQLite, a database is dropped when we delete a file
 		if (file_exists($this->db->database))
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 019adad91..9aa716c89 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -34,6 +34,7 @@ Bug fixes for 3.1.1
 -  Fixed a bug (#4809) - :doc:`Database <database/index>` driver 'pdo/mysql' didn't turn off ``AUTOCOMMIT`` when starting a transaction.
 -  Fixed a bug (#4822) - :doc:`CAPTCHA Helper <helpers/captcha_helper>` didn't clear expired PNG images.
 -  Fixed a bug (#4823) - :doc:`Session Library <libraries/sessions>` 'files' driver could enter an infinite loop if ``mbstring.func_override`` is enabled.
+-  Fixed a bug (#4851) - :doc:`Database Forge <database/forge>` didn't quote schema names passed to its ``create_database()`` method.
 
 Version 3.1.0
 =============