bulkloader.py 文件源码

def _OpenSecondaryConnection(self):
    """Possibly open a database connection for the secondary thread.

    If the connection is not open (for the calling thread, which is assumed
    to be the unique secondary thread), then open it. We also open a couple
    cursors for later use (and reuse).
    """
    if self.secondary_conn:
      return

    assert not _RunningInThread(self.primary_thread)

    self.secondary_thread = threading.currentThread()







    self.secondary_conn = sqlite3.connect(self.db_filename)


    self.insert_cursor = self.secondary_conn.cursor()
    self.update_cursor = self.secondary_conn.cursor()