Add seed values support for Query Builder order_by
(feature request #1987)
diff --git a/system/database/drivers/postgre/postgre_driver.php b/system/database/drivers/postgre/postgre_driver.php
index 40f21b1..a52777b 100644
--- a/system/database/drivers/postgre/postgre_driver.php
+++ b/system/database/drivers/postgre/postgre_driver.php
@@ -60,9 +60,9 @@
/**
* ORDER BY random keyword
*
- * @var string
+ * @var array
*/
- protected $_random_keyword = ' RANDOM()'; // database specific random keyword
+ protected $_random_keyword = array('RANDOM()', 'RANDOM()');
// --------------------------------------------------------------------
@@ -482,6 +482,41 @@
// --------------------------------------------------------------------
/**
+ * ORDER BY
+ *
+ * @param string $orderby
+ * @param string $direction ASC or DESC
+ * @param bool $escape
+ * @return object
+ */
+ public function order_by($orderby, $direction = '', $escape = NULL)
+ {
+ $direction = strtoupper(trim($direction));
+ if ($direction === 'RANDOM')
+ {
+ if ( ! is_float($orderby) && ctype_digit((string) $orderby))
+ {
+ $orderby = ($orderby > 1)
+ ? (float) '0.'.$orderby
+ : (float) $orderby;
+ }
+
+ if (is_float($orderby))
+ {
+ $this->simple_query('SET SEED '.$orderby);
+ }
+
+ $orderby = $this->_random_keyword[0];
+ $direction = '';
+ $escape = FALSE;
+ }
+
+ return parent::order_by($orderby, $direction, $escape);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* Update statement
*
* Generates a platform-specific update string from the supplied data