mybatis if标签判断不生效的解决方法

<if test="computationrule == '1'">
  from app_sz_bbb a
</if>
<if test="computationrule == '2'">
  from app_ccc a
</if>

<if test="computationrule == '1'.tostring()">
  from app_sz_bbb a
</if>
<if test="computationrule == '2'.tostring()">
  from app_ccc a
</if>

<choose>
   <when test="computationrule == '1'">
   from app_sz_bbb a
   </when>
   <otherwise>
     from app_sz_bbb a
   </otherwise>
 </choose>

<if test='computationrule == "1"'>
  from app_sz_bbb a
</if>
<if test='computationrule == "2"'>
  from app_ccc a
</if>

<if test="isbound != null and isbound !='' and isbound == '1'">
  and box_sid is not null 
</if>
<if test="isbound != null and isbound !='' and isbound == '2'">
  and box_sid is null 
</if>

<if test="isbound != null and isbound !='' and isbound == '1'.tostring()">
  and box_sid is not null 
</if>
<if test="isbound != null and isbound !='' and isbound == '2'.tostring()">
  and box_sid is null 
 </if>