where下用case when的问题

[charlesxu]

下面的写法可以通过，因为case when对字段名进行选择

select checkvaluetable.* from checkvaluetable@test inner join checkfile@test on checkvaluetable.filename = checkfile.filename ]]><![CDATA[
            where checkfile.filename like '%{1}%' and 
            (case when '{2}' = 'ISKeylack' then checkfile.ISKeylack 
            when '{2}' = 'ISCiNoExist' then checkfile.ISCiNoExist 
            when '{2}' = 'ISFMPMMatching' then checkfile.ISFMPMMatching 
            when '{2}' = 'ISNotReal' then checkfile.ISNotReal 
            when '{2}' = 'IS30PER' then checkfile.IS30PER 
            else checkfile.ISConFiveDay end) = 'true'

但是这下面的写法就不对了，因为case when是对整个where子句做判断

select keyvaluetable.* from keyvaluetable inner join checkfile on keyvaluetable.filename = checkfile.filename 
                   where checkfile.filename like '%{1}%' and 
                   case when 'FDESC' = 'FDESC' then checkfile.fdesc like '%没有通过%'
                   else checkfile.ISKEYLACK = 'true' end

请问有其它写法能实现上面这个sql语句，通过case when来根据参数选择执行任意一个where子句吗？

[BenChiM888]

SELECT KEYVALUETABLE.*
  FROM KEYVALUETABLE
 INNER JOIN CHECKFILE ON KEYVALUETABLE.FILENAME = CHECKFILE.FILENAME
 WHERE CHECKFILE.FILENAME LIKE '%{1}%'
   AND (CHECKFILE.FDESC LIKE CASE WHEN 'FDESC' = 'FDESC' THEN '%没有通过%' ELSE NULL END 
        OR
        CHECKFILE.ISKEYLACK = CASE WHEN 'FDESC' = 'FDESC' THEN NULL ELSE 'true' END)
;