Discuz升级后（旧版本到3.2版本），发现抱歉，该附件无法读取的错误
报错信息：抱歉，该附件无法读取
经排查，权限之类的完全正确。排查了数据库，发现数据升级时候丢掉了一些数据。
主要是这个表：pre_forum_attachment，丢掉了大部分附件所有数据。
解决办法：sql执行以下命令（有一个缺点，附件下载次数没有了）。如果想完全的恢复，只能恢复备份数据重新执行。
再次郑重说明，删除数据一定要谨慎，数据无价，谨慎操作。
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,1,'10' FROM pre_forum_attachment_1 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,2,'10' FROM pre_forum_attachment_2 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,3,'10' FROM pre_forum_attachment_3 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,4,'10' FROM pre_forum_attachment_4 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,5,'10' FROM pre_forum_attachment_5 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,6,'10' FROM pre_forum_attachment_6 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,7,'10' FROM pre_forum_attachment_7 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,8,'10' FROM pre_forum_attachment_8 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
INSERT INTO pre_forum_attachment(aid,tid,pid, uid,tableid,downloads)SELECT aid,tid,pid, uid,9,'10' FROM pre_forum_attachment_9 d WHERE NOT EXISTS (select tid from pre_forum_attachment where pre_forum_attachment.aid = d.aid);
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