mybatis 遍历foreach中or拼接的操作

select id, name from t_keys where 1 = 1 
<if test="keys != null"> 
 <foreach collection="keys" item="key" open="AND (" close=")" separator="or" > 
 name = #{key} 
 </foreach> 
</if>

//使用&或者&& | 和||
if（a==1&b==2）｛
｝
//或者sql文中的and和or
select * from emp where empno='7788' and deptno='20'

//动态添加语句
<if test="(buhinmt.buhinCd!= null and buhinmt.buhinCd != '') or(buhinmt.syohinCd!= null and buhinmt.syohinCd != '')">
 AND BM.buhin_cd = SMBM.buhin_cd 
 AND SMBM.syohin_cd = SM.syohin_cd 
 AND SM.syurisaki_cd = SYUM.syurisaki_cd
 </if>