对顺序文件做读文件操作时，总是从 按顺序读出信息。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30162' and id < 2440400 and id<>'2440400' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30162' and id > 2440400 and id<>'2440400' order by id asc limit 5