diff --git a/WebBasedCrawler/base/baseclasses.py b/WebBasedCrawler/base/baseclasses.py
index 70fc8a8..8203cc2 100644
--- a/WebBasedCrawler/base/baseclasses.py
+++ b/WebBasedCrawler/base/baseclasses.py
@@ -32,6 +32,7 @@ def is_debugger_attached():
 
 is_debug = is_debugger_attached()
 
+
 def printl(*objects, sep=' ', end='\n', file=None, flush=True):
     if is_debug:
         cur_frame = inspect.currentframe()
diff --git a/WebBasedCrawler/base/dbdata.py b/WebBasedCrawler/base/dbdata.py
index d08d986..e36185d 100644
--- a/WebBasedCrawler/base/dbdata.py
+++ b/WebBasedCrawler/base/dbdata.py
@@ -24,6 +24,34 @@ class DataDBRow:
         self.reply_url = None
         self.etc = None
 
+    def get_keys(self):
+        inst = DataDBRow()
+        keys = ()
+        for key, value_type in inst.__dict__.items():
+            if key.startswith('__') or callable(value_type):
+                continue
+
+            keys += key,
+
+        return keys
+
+    def get_values(self, conn, db_num):
+        inst = DataDBRow()
+        values = ()
+        for key, value_type in inst.__dict__.items():
+            if key.startswith('__') or callable(value_type):
+                continue
+
+            value = self.__dict__[key]
+            if isinstance(value, Number):
+                values += str(value),
+            elif isinstance(value, str):
+                values += conn.escape(value.encode('utf8').decode('utf8')),
+            else:
+                values += conn.escape(value),
+
+        return values
+
     def get_insert_query(self, conn, db_num):
 
         inst = DataDBRow()
diff --git a/WebBasedCrawler/base/proxy.py b/WebBasedCrawler/base/proxy.py
index e3f5d6c..a36367c 100644
--- a/WebBasedCrawler/base/proxy.py
+++ b/WebBasedCrawler/base/proxy.py
@@ -97,6 +97,31 @@ def get_driver(platform, proxies):
     else:
         return platform_webdriver[platform](capabilities=desired_capabilities)
 
+_expired_proxies = []
+
+
+def set_proxy_expired(proxy):
+    if proxy not in _expired_proxies:
+        _expired_proxies.append(proxy)
+
+    address = proxy['http'][len('http://'):]
+
+    with open(proxy_filename, 'r') as f:
+        lines = f.readlines()
+
+    expired_idx = -1
+    for idx, line in enumerate(lines):
+        if line.startswith(address):
+            expired_idx = idx
+            break
+
+    if expired_idx >= 0:
+        lines[expired_idx] = '# ' + lines[expired_idx]
+        lines.append(lines.pop(expired_idx))
+
+    with open(proxy_filename, 'w') as f:
+        f.writelines(lines)
+
 
 def get_proxy_from_file(filename):
     """
@@ -104,7 +129,7 @@ def get_proxy_from_file(filename):
     :return (ip, port): string, string
     if ip, port or filename is invalid, return (None, None)
     """
-    proxy_lists = [line.replace('\n', '') for line in open(filename) if re_ip.search(line)]
+    proxy_lists = [line.replace('\n', '') for line in open(filename) if not line.strip().startswith('#') and re_ip.search(line)]
     if proxy_lists:
         m = re_ip.search(proxy_lists[random.randint(0, len(proxy_lists) - 1)])
         if m: