Attempt to fix some issues with prepaired explain queries

Author: kormoc

init.php

@@ -12,10 +12,15 @@
 	require_once('config.php');
 	require_once('util.php');
 	require_once('libs/Database/Database.php');
-	Database::connect(null, $reviewhost['user'], $reviewhost['password'], null, null, 'pdo', array('dsn' => $reviewhost['dsn']), 'review');
+    
+    $options = array('dsn'                              => $reviewhost['dsn'],
+                     PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true
+                     );
+    
+	Database::connect(null, $reviewhost['user'], $reviewhost['password'], null, null, 'pdo', $options, 'review');
 
 // Needed for SqlParser
-	$dbh = new PDO($reviewhost['dsn'], $reviewhost['user'], $reviewhost['password']);
+	$dbh = new PDO($reviewhost['dsn'], $reviewhost['user'], $reviewhost['password'], $options);
 
     require_once('libs/sqlquery/SqlParser.php');
 	require_once('classes/QueryRewrite.php');

libs/Database/Database/Query/pdo.php

@@ -66,8 +66,15 @@ public function execute() {
         // working on prepared statements that return multiple result sets
         // combined with multiple concurrent statement handles.  See the
         // comments on the PDOStatement::closeCursor() manual page.
-            $this->sh = $this->dbh->prepare($this->last_query);
-            $this->sh->execute($nargs);
+        
+        // Skip preparing the query if there are no args in the query.
+            if ($nargn == 0) {
+                $this->sh = $this->dbh->query($this->last_query);
+            }
+            else {
+                $this->sh = $this->dbh->prepare($this->last_query);
+                $this->sh->execute($nargs);
+            }
         } catch(PDOException $e) {
             $this->last_exception = $e;
             $this->db->error('SQL Error:');