Add DboSource::flushQueryCache()

Author: chinpei215

lib/Cake/Model/Datasource/DboSource.php

@@ -3540,6 +3540,15 @@ public function introspectType($value) {
 		return 'string';
 	}
 
+/**
+ * Empties the query caches.
+ *
+ * @return void
+ */
+	public function flushQueryCache() {
+		$this->_queryCache = array();
+	}
+
 /**
  * Writes a new key for the in memory sql query cache
  *

lib/Cake/Test/Case/Model/Datasource/DboSourceTest.php

@@ -1810,4 +1810,20 @@ public function testHasOneAfterFind() {
 		$User->Article = $Article;
 		$User->find('first', array('conditions' => array('User.id' => 1), 'recursive' => 2));
 	}
+
+/**
+ * Test that flushQueryCache works as expected
+ *
+ * @return void
+ */
+	public function testFlushQueryCache() {
+		$this->db->flushQueryCache();
+		$this->db->query('SELECT 1');
+		$this->db->query('SELECT 1');
+		$this->db->query('SELECT 2');
+		$this->assertAttributeCount(2, '_queryCache', $this->db);
+
+		$this->db->flushQueryCache();
+		$this->assertAttributeCount(0, '_queryCache', $this->db);
+	}
 }