diff --git a/classes/db/DB.class.php b/classes/db/DB.class.php
index bec5666a1..85339e092 100644
--- a/classes/db/DB.class.php
+++ b/classes/db/DB.class.php
@@ -175,12 +175,6 @@
          * @return list of supported db
          **/
         function _getSupportedList() {
-			static $get_supported_list = '';
-			if(is_array($get_supported_list)) {
-				$this->supported_list = $get_supported_list;
-				return $this->supported_list;
-			}
-			$get_supported_list = array();
             $db_classes_path = _XE_PATH_."classes/db/";
             $filter = "/^DB([^\.]+)\.class\.php/i";
             $supported_list = FileHandler::readDir($db_classes_path, $filter, true);
@@ -207,9 +201,9 @@
                 $obj->db_type = $db_type;
                 $obj->enable = $oDB->isSupported() ? true : false;
 
-                $get_supported_list[] = $obj;
+                $this->supported_list[] = $obj;
             }
-			$this->supported_list = $get_supported_list;
+
             return $this->supported_list;
         }
 
@@ -337,7 +331,6 @@
          * @remarks this function finds xml file or cache file of $query_id, compiles it and then execute it
          **/
         function executeQuery($query_id, $args = NULL, $arg_columns = NULL) {
-			static $cache_file = array();
             if(!$query_id) return new Object(-1, 'msg_invalid_queryid');
 			if(!$this->db_type) return;
 
@@ -345,40 +338,38 @@
 
 			$this->query_id = $query_id;
 
-			if(!isset($cache_file[$query_id])) {
-				$id_args = explode('.', $query_id);
-				if(count($id_args) == 2) {
-					$target = 'modules';
-					$module = $id_args[0];
-					$id = $id_args[1];
-				} elseif(count($id_args) == 3) {
-					$target = $id_args[0];
-					if(!in_array($target, array('addons','widgets'))){
-						$this->actDBClassFinish();
-						return;
-					}
-					$module = $id_args[1];
-					$id = $id_args[2];
-				}
-				if(!$target || !$module || !$id){
-					$this->actDBClassFinish();
-					return new Object(-1, 'msg_invalid_queryid');
-				}
+            $id_args = explode('.', $query_id);
+            if(count($id_args) == 2) {
+                $target = 'modules';
+                $module = $id_args[0];
+                $id = $id_args[1];
+            } elseif(count($id_args) == 3) {
+                $target = $id_args[0];
+                if(!in_array($target, array('addons','widgets'))){
+		    $this->actDBClassFinish();
+		    return;
+		}
+                $module = $id_args[1];
+                $id = $id_args[2];
+            }
+            if(!$target || !$module || !$id){
+		$this->actDBClassFinish();
+		return new Object(-1, 'msg_invalid_queryid');
+	    }
 
-				$xml_file = sprintf('%s%s/%s/queries/%s.xml', _XE_PATH_, $target, $module, $id);
-				if(!file_exists($xml_file)){
-					$this->actDBClassFinish();
-					return new Object(-1, 'msg_invalid_queryid');
-				}
+            $xml_file = sprintf('%s%s/%s/queries/%s.xml', _XE_PATH_, $target, $module, $id);
+            if(!file_exists($xml_file)){
+		$this->actDBClassFinish();
+		return new Object(-1, 'msg_invalid_queryid');
+	    }
 
-				// look for cache file
-				$cache_file[$query_id] = $this->checkQueryCacheFile($query_id, $xml_file);
-			}
-			$result = $this->_executeQuery($cache_file[$query_id], $args, $query_id, $arg_columns);
+            // look for cache file
+            $cache_file = $this->checkQueryCacheFile($query_id, $xml_file);
+	    $result = $this->_executeQuery($cache_file, $args, $query_id, $arg_columns);
 
-			$this->actDBClassFinish();
-			// execute query
-			return $result;
+	    $this->actDBClassFinish();
+            // execute query
+            return $result;
         }
 
 
diff --git a/classes/db/queryparts/Query.class.php b/classes/db/queryparts/Query.class.php
index 33f233a1a..729ca46e4 100644
--- a/classes/db/queryparts/Query.class.php
+++ b/classes/db/queryparts/Query.class.php
@@ -92,10 +92,6 @@
 
 			$this->tables = $tables;
 		}
-		
-		function setSubquery($subquery){
-			$this->subquery = $subquery;
-		}
 
 		function setConditions($conditions){
                     $this->conditions = array();
@@ -189,20 +185,6 @@
 
 		function getInsertString($with_values = true){
 			$columnsList = '';
-			if($this->subquery){ // means we have insert-select
-				
-				foreach($this->columns as $column){
-					$columnsList .= $column->getColumnName() . ', ';
-				}
-				$columnsList = substr($columnsList, 0, -2);
-				
-				$selectStatement = $this->subquery->toString($with_values);
-				$selectStatement = substr($selectStatement, 1, -1);
-				
-				return "($columnsList) \n $selectStatement";
-			}
-			
-			
 			$valuesList = '';
 			foreach($this->columns as $column){
 				if($column->show()){
diff --git a/classes/xml/XmlQueryParser.150.class.php b/classes/xml/XmlQueryParser.150.class.php
index c90402e63..f42920447 100644
--- a/classes/xml/XmlQueryParser.150.class.php
+++ b/classes/xml/XmlQueryParser.150.class.php
@@ -21,7 +21,6 @@
 	require(_XE_PATH_.'classes/xml/xmlquery/tags/column/ColumnTag.class.php');
         require(_XE_PATH_.'classes/xml/xmlquery/tags/column/SelectColumnTag.class.php');
         require(_XE_PATH_.'classes/xml/xmlquery/tags/column/InsertColumnTag.class.php');
-		require(_XE_PATH_.'classes/xml/xmlquery/tags/column/InsertColumnTagWithoutArgument.class.php');
         require(_XE_PATH_.'classes/xml/xmlquery/tags/column/UpdateColumnTag.class.php');
         require(_XE_PATH_.'classes/xml/xmlquery/tags/column/SelectColumnsTag.class.php');
         require(_XE_PATH_.'classes/xml/xmlquery/tags/column/InsertColumnsTag.class.php');
diff --git a/classes/xml/xmlquery/tags/column/InsertColumnTagWithoutArgument.class.php b/classes/xml/xmlquery/tags/column/InsertColumnTagWithoutArgument.class.php
deleted file mode 100644
index 011800840..000000000
--- a/classes/xml/xmlquery/tags/column/InsertColumnTagWithoutArgument.class.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-    /**
-     * @class InsertColumnTagWithoutArgument
-     * @author Arnia Software
-     * @brief Models the <column> tag inside an XML Query file whose action is 'insert-select'
-     *
-     **/
-
-	class InsertColumnTagWithoutArgument extends ColumnTag {
-
-		function InsertColumnTagWithoutArgument($column) {
-			parent::ColumnTag($column->attrs->name);
-			$dbParser = DB::getParser();
-			$this->name = $dbParser->parseColumnName($this->name);
-		}
-
-		function getExpressionString(){
-			var_dump($this->name);
-			return sprintf('new Expression(\'%s\')', $this->name);
-		}
-
-		function getArgument(){
-			return null;
-		}
-
-	}
-?>
\ No newline at end of file
diff --git a/classes/xml/xmlquery/tags/column/InsertColumnsTag.class.php b/classes/xml/xmlquery/tags/column/InsertColumnsTag.class.php
index d849952db..88ed19ccb 100644
--- a/classes/xml/xmlquery/tags/column/InsertColumnsTag.class.php
+++ b/classes/xml/xmlquery/tags/column/InsertColumnsTag.class.php
@@ -19,7 +19,6 @@
 
 			foreach($xml_columns as $column){
 				if($column->name === 'query') $this->columns[] = new QueryTag($column, true);
-				else if(!isset($column->attrs->var) && !isset($column->attrs->default)) $this->columns[] = new InsertColumnTagWithoutArgument($column);
 				else $this->columns[] = new InsertColumnTag($column);
 			}
 		}
diff --git a/classes/xml/xmlquery/tags/query/QueryTag.class.php b/classes/xml/xmlquery/tags/query/QueryTag.class.php
index d65af090b..ac9a2a6c4 100644
--- a/classes/xml/xmlquery/tags/query/QueryTag.class.php
+++ b/classes/xml/xmlquery/tags/query/QueryTag.class.php
@@ -10,7 +10,6 @@ class QueryTag {
 	//xml tags
 	var $columns;
 	var $tables;
-	var $subquery;
 	var $conditions;
 	var $groups;
 	var $navigation;
@@ -38,12 +37,9 @@ class QueryTag {
 		$this->getColumns();
 		$tables = $this->getTables();
 		$this->setTableColumnTypes($tables);
-		$this->getSubquery(); // Used for insert-select
 		$this->getConditions();
 		$this->getGroups();
 		$this->getNavigation();
-		
-		
 		$this->getPrebuff();
 		$this->getBuff();
 	}
@@ -82,7 +78,7 @@ class QueryTag {
 	function getColumns(){
 		if($this->action == 'select'){
 			return $this->columns =  new SelectColumnsTag($this->query->columns);
-		}else if($this->action == 'insert' || $this->action == 'insert-select'){
+		}else if($this->action == 'insert'){
 			return $this->columns =  new InsertColumnsTag($this->query->columns->column);
 		}else if($this->action == 'update') {
 			return $this->columns =  new UpdateColumnsTag($this->query->columns->column);
@@ -92,7 +88,6 @@ class QueryTag {
 	}
 
 	function getPrebuff(){
-		if($this->isSubQuery) return;
 		// TODO Check if this work with arguments in join clause
 		$arguments = $this->getArguments();
 
@@ -144,8 +139,6 @@ class QueryTag {
 			$buff .= '$query->setColumns(' . $this->columns->toString() . ');'.PHP_EOL;
 
         $buff .= '$query->setTables(' . $this->tables->toString() .');'.PHP_EOL;
-		if($this->action == 'insert-select')
-				$buff .= '$query->setSubquery(' . $this->subquery->toString() .');'.PHP_EOL;
         $buff .= '$query->setConditions('.$this->conditions->toString() .');'.PHP_EOL;
        	$buff .= '$query->setGroups(' . $this->groups->toString() . ');'.PHP_EOL;
        	$buff .= '$query->setOrder(' . $this->navigation->getOrderByString() .');'.PHP_EOL;
@@ -156,18 +149,12 @@ class QueryTag {
 	}
 
 	function getTables(){
-		if($this->query->index_hint->attrs->for == 'ALL' || Context::getDBType() == strtolower($this->query->index_hint->attrs->for))
-			return $this->tables = new TablesTag($this->query->tables, $this->query->index_hint);
-		else
-			return $this->tables = new TablesTag($this->query->tables);
+                if($this->query->index_hint->attrs->for == 'ALL' || Context::getDBType() == strtolower($this->query->index_hint->attrs->for))
+                    return $this->tables = new TablesTag($this->query->tables, $this->query->index_hint);
+                else
+                    return $this->tables = new TablesTag($this->query->tables);
 	}
 
-	function getSubquery(){
-		if($this->query->query){
-			$this->subquery = new QueryTag($this->query->query, true);
-		}
-	}
-	
 	function getConditions(){
 		return $this->conditions = new ConditionsTag($this->query->conditions);
 	}
@@ -196,13 +183,12 @@ class QueryTag {
 		return $this->buff;
 	}
 
+
 	function getArguments(){
 		$arguments = array();
 		if($this->columns)
 			$arguments = array_merge($arguments, $this->columns->getArguments());
-		if($this->action =='insert-select')
-			$arguments = array_merge($arguments, $this->subquery->getArguments());
-        $arguments = array_merge($arguments, $this->tables->getArguments());
+                $arguments = array_merge($arguments, $this->tables->getArguments());
 		$arguments = array_merge($arguments, $this->conditions->getArguments());
 		$arguments = array_merge($arguments, $this->navigation->getArguments());
 		return $arguments;
diff --git a/tests/classes/db/db/xml_query/mysql/MysqlInsertTest.php b/tests/classes/db/db/xml_query/mysql/MysqlInsertTest.php
deleted file mode 100644
index f064ca626..000000000
--- a/tests/classes/db/db/xml_query/mysql/MysqlInsertTest.php
+++ /dev/null
@@ -1,44 +0,0 @@
-<?php
-
-/**
- * @class MysqlInsertTest
- * @brief Constains all test method for insert statements, using Mysql SQL syntax
- * @developer Corina Udrescu (xe_dev@arnia.ro)
- */
-class MysqlInsertTest extends MysqlTest 
-{
-	/**
-	 * @brief _test - local helper method
-	 * @developer Corina Udrescu (xe_dev@arnia.ro)
-	 * @access private
-	 * @param $xml_file string - Path to XML file containing the query to be tested
-	 * @param $argsString string - String containing PHP code that initializez the arguments that the query receives
-	 * @param $expected string - Expected SQL query as string
-	 * @param $columnList array - Array containing the column names that will be retrieved, in case only a part of the ones in the query file are needed
-	 * @return void
-	 */
-	function _test($xml_file, $argsString, $expected, $columnList = NULL)
-	{
-		$this->_testQuery($xml_file, $argsString, $expected, 'getInsertSql', $columnList);
-	}
-
-	/**
-	 * @brief testInsertSelectStatement - checks that when query action is 'insert-selct' an 'INSERT INTO .. SELECT ...' statement is properly generated
-	 * @developer Corina Udrescu (xe_dev@arnia.ro)
-	 * @access public
-	 * @return void
-	 */
-	function testInsertSelectStatement()
-	{
-		$xml_file = _TEST_PATH_ . "db/xml_query/mysql/data/insert_select.xml";
-		$argsString = '$args->condition_value = 7;';
-		$expected = 'insert into `xe_table1` (`column1`, `column2`, `column3`) 
-						select `column4`, `column5`, `column6` 
-							from `xe_table2` as `table2` 
-							where `column4` >= 7';
-		$this->_test($xml_file, $argsString, $expected);
-	}
-}
-
-/* End of file MysqlInsertTest.php */
-/* Location: ./tests/classes/db/db/xml_query/mysql/MysqlInsertTest.php */
diff --git a/tests/classes/db/db/xml_query/mysql/data/insert_select.xml b/tests/classes/db/db/xml_query/mysql/data/insert_select.xml
deleted file mode 100644
index 4aa87f26c..000000000
--- a/tests/classes/db/db/xml_query/mysql/data/insert_select.xml
+++ /dev/null
@@ -1,23 +0,0 @@
-<query id="QUERY_ID" action="insert-select">
-    <tables>
-            <table name="table1" />
-    </tables>
-    <columns>
-            <column name="column1" />
-            <column name="column2" />
-            <column name="column3" />
-    </columns>
-	<query>
-			<tables>
-					<table name="table2" />
-			</tables>
-			<columns>
-					<column name="column4" />
-					<column name="column5" />
-					<column name="column6" />
-			</columns>
-			<conditions>
-					<condition operation="more" column="column4" default="100" var="condition_value" />
-			</conditions>
-	</query>		
-</query>
\ No newline at end of file