我想实现sql语句where后面的条件拼接，就是通过if判断去拼接，这个怎么写？mysql数据库。
where 1=1
${if(len(参数1)=0,""," AND 字段1 IN ('"+参数1+"')")}
${if(len(参数2)=0,""," AND 字段2 IN ('"+参数2+"')")}
一般是这样
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