如何在Python中使用Firebird審計和跟蹤服務？

Question

我試圖用Firebird 2.5，Python 2.7和FDB 1.4來使用審計和跟蹤服務。

這是我在做什麼空閒：

>>> import fdb 
>>> svc = fdb.services.connect(password='masterkey', host='localhost') 
>>> trace_config = """<database> 
enabled true 
log_connections true 
log_transactions true 
log_statement_finish true 
time_threshold 0 

</database>""" 
>>> trace_id = svc.trace_start(trace_config, 'test_trace_2') 
>>> svc.readline() 

在此之後我連接到數據庫，並進行一些選擇等，但readline的永不再來。

我錯過了某個步驟？

Answer 1

原來，有64kb的輸出緩衝區。有一種方法可以直接從FDB作者Pavel Cisar獲得輸出：

while 1: 
    try: 
     line = svc._QS(fdb.ibase.isc_info_svc_line) 
    except fdb.OperationalError: 
     # It is routine for actions such as RESTORE to raise an 
     # exception at the end of their output. We ignore any such 
     # exception and assume that it was expected, which is somewhat 
     # risky. For example, suppose the network connection is broken 
     # while the client is receiving the action's output... 
     break 
    if not line: # we reached the end of output 
     break 
    print line