                 return
             }
         
-            //execute the query statement
+            //execute the change statement
             error = SQLiteDB.sharedInstance.executeChange(sqlStr, withArgs: withArgs)
         
             //close database connection

                return
            }
        
            //execute the update statement
            error = SQLiteDB.sharedInstance.executeChange(sqlStr)
        
            //close database connection

    
    private class SQLiteDB {
        
        //create a single instance of SQLiteDB
        class var sharedInstance: SQLiteDB {
            struct Singleton {
                static let instance = SQLiteDB()
