mysql where条件里面加if判断

SELECT * FROM  gx_notice WHERE   IF(seestate=1,kjfwid LIKE '%85a8f53e59ac4dfd89fd315012a016a8%',1=1 ) 

还有一种简单的写法   SELECT * FROM  gx_notice WHERE 1=1  AND seestate=0 OR  kjfwid  LIKE '%85a8f53e59ac4dfd89fd315012a016a8%'