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我正在运行 FQL 查询并且我保留此错误但无法弄清楚原因，因为错误消息没有告诉我任何内容。查询和错误是：

SELECT backdated_time, can_backdate, caption, created_time, owner, owner_comment, picture, summary, title, url FROM link WHERE owner IN (SELECT uid2 FROM friend WHERE uid1 = me()) AND (strpos(lower(summary),"boston") >=0 OR strpos(lower(owner_comment),"boston") >=0 ) LIMIT 20

Fatal error: Uncaught Exception: 1: An unknown error occurred
  thrown in /Facebook/base_facebook.php on line 1254

有谁知道为什么会出现这个错误？我正在使用 Facebook PHP 库。

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1 回答 1

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令人窒息，查询太大了。考虑使用多查询、朋友查询的 LIMITs 和一些 OFFSET 来分页数据。

fql?q={"friendsquery":"SELECT uid2 FROM friend WHERE uid1 = me() LIMIT 20 OFFSET 0","linkquery": "SELECT backdated_time, can_backdate, caption, created_time, owner, owner_comment, picture, summary, title, url FROM link WHERE owner IN (SELECT uid2 FROM #friendsquery) AND (strpos(lower(summary),'boston') >=0 OR strpos(lower(owner_comment),'boston') >=0 ) LIMIT 20"}

对于 400 个好友列表，当前查询需要 80 秒。

这是 Python 中的示例，它不是 PHP，但 API 实现是相同的

from facepy import GraphAPI
import time
import urllib
import json

fb_dump = open('dumpfb.txt', 'w')

graph = GraphAPI('MY_ACCESS_TOKEN')

all_posts = []
offset = 0

friendsquery = 'SELECT uid2 FROM friend WHERE uid1 = me() LIMIT 20 OFFSET '+ str(offset)

linksquery = 'SELECT backdated_time, can_backdate, caption, created_time, owner, owner_comment, picture, summary, title, url FROM link WHERE owner IN (SELECT uid2 FROM #friendsquery) AND (strpos(lower(summary),"trinidad") >=0 OR strpos(lower(owner_comment),"trinidad") >=2 ) LIMIT 20'


t0 = time.time()

try:
     my_posts = graph.fql({'friendsquery': friendsquery, 'linksquery': linksquery})
     while my_posts["data"][0]["fql_result_set"]:
         all_posts = all_posts + my_posts["data"]
         offset = offset + 20
   friendsquery = 'SELECT uid2 FROM friend WHERE uid1 = me() LIMIT 20 OFFSET '+ str(offset)
     my_posts = graph.fql({'friendsquery': friendsquery, 'linksquery': linksquery})
     t1 = time.time()
     print t1-t0
     fb_dump.write(json.dumps(all_posts, indent=4))
except GraphAPI.OAuthError, e:
     print e.message

进行批量查询可以使查询时间缩短到 25 秒。不快，但比前两个查询快一个订单。我没有在 PHP 中做过，但你应该明白要点

这是一批中的 20 个多查询和一个 /me/friend 调用

fb_dump = open('lumpfb.txt', 'w')

graph = GraphAPI('MY_ACCESS_TOKEN')


all_posts = []
offset = 0

friendsquery = 'SELECT uid2 FROM friend WHERE uid1 = me() LIMIT 20 OFFSET '

linksquery = 'SELECT backdated_time, can_backdate, caption, created_time, owner, owner_comment, picture, summary, title, url FROM link WHERE owner IN (SELECT uid2 FROM #friendsquery) AND (strpos(lower(summary),\'trinidad\') >=0 OR strpos(lower(owner_comment),\'trinidad\') >=2 ) LIMIT 20'


t0 = time.time()

batch_request = []

try:
     my_friends = graph.get("me?fields=friends")
     counter = len(my_friends["friends"]["data"])
     while counter > 0 :
     friendsquery0 = 'SELECT uid2 FROM friend WHERE uid1 = me() LIMIT 20 OFFSET '+ str(offset)
     the_query = '{"friendsquery":"'+friendsquery0+'","linksquery":"'+linksquery+'"}'
     batch_item = {"method":"GET","relative_url":"fql?q=" + the_query}
     batch_request.append(batch_item)
     offset = offset + 20
     counter = counter - 20
     my_posts = graph.batch(batch_request)
     for post in my_posts:
     all_posts = all_posts + post['data']
     t1 = time.time()
     print t1-t0
except facepy.exceptions.FacepyError, e:
     print e.message
于 2013-05-27T14:38:20.153 回答