数据库错误: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1' at line 1]
SELECT * FROM doc_list WHERE channelId=5 ORDER BY ordering DESC,id DESC LIMIT ,1

数据库错误: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-2,1' at line 1]
SELECT * FROM doc_list WHERE channelId=5 ORDER BY ordering DESC,id DESC LIMIT -2,1

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