Fix call_function() for the native PostgreSQL, Oracle drivers and imp…

…lement logic for method calls

system/database/DB_driver.php

@@ -65,6 +65,7 @@ abstract class CI_DB_driver {
 	public $queries			= array();
 	public $query_times		= array();
 	public $data_cache		= array();
+	public $function_prefix;
 
 	public $trans_enabled		= TRUE;
 	public $trans_strict		= TRUE;
@@ -1182,23 +1183,35 @@ protected function _get_operator($str)
 	 * @param	mixed	any parameters needed by the function
 	 * @return	mixed
 	 */
-	public function call_function($function)
+	public function call_function($func)
 	{
-		$driver = ($this->dbdriver === 'postgre') ? 'pg_' : $this->dbdriver.'_';
-
-		if (FALSE === strpos($driver, $function))
+		// Procedural
+		if (isset($this->function_prefix))
 		{
-			$function = $driver.$function;
-		}
+			if (FALSE === strpos($func, $this->function_prefix))
+			{
+				$func = $this->function_prefix.$func;
+			}
 
-		if ( ! function_exists($function))
+			if ( ! function_exists($func))
+			{
+				return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
+			}
+		}
+		else
+		// OOP
 		{
-			return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
+			if ( ! method_exists($this->conn_id, $func))
+			{
+				return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
+			}
+
+			$func = array($this->conn_id, $func);
 		}
 
 		return (func_num_args() > 1)
-			? call_user_func_array($function, array_splice(func_get_args(), 1))
-			: call_user_func($function);
+			? call_user_func_array($func, array_splice(func_get_args(), 1))
+			: call_user_func($func);
 	}
 
 	// --------------------------------------------------------------------

system/database/drivers/native_driver.php

@@ -40,8 +40,6 @@
  */
 abstract class CI_DB_native_driver extends CI_DB {
 
-	public $function_prefix;
-
 	// The character used to escaping
 	protected $_escape_char = '"';
 

user_guide_src/source/changelog.rst

@@ -137,8 +137,8 @@ Release Date: Not Released
    -  Added PDO support for create_database(), drop_database and drop_table() in :doc:`Database Forge <database/forge>`.
    -  Added unbuffered_row() method for getting a row without prefetching whole result (consume less memory).
    -  Added PDO support for ``list_fields()`` in :doc:`Database Results <database/results>`.
-   -  Added capability for packages to hold database.php config files 
-   -  Added subdrivers support (currently only used by PDO).
+   -  Added capability for packages to hold database.php config files.
+   -  Added OOP support for the ``call_function()`` method (used by SQLite3, PDO).
 
 -  Libraries
 
@@ -316,6 +316,7 @@ Bug fixes for 3.0
 -  Fixed a bug (#135) - PHP Error logging was impossible without the errors being displayed.
 -  Fixed a bug (#1613) - :doc:`Form Helper <helpers/form_helper>` functions ``form_multiselect()``, ``form_dropdown()`` didn't properly handle empty array option groups.
 -  Fixed a bug (#1605) - :doc:`Pagination Library <libraries/pagination>` produced incorrect *previous* and *next* link values.
+-  Fixed a bug in :doc:`Database method call_function() <database/call_function>` where it failed with the OCI8 and PDO drivers.
 
 Version 2.1.2
 =============