select * from table
<where>
<if test = "....">
....
</if>
<choose>
<when test = "....">
and ...
</when>
</choose>
</where>
如图
select * from table
<where>
<if test = "....">
....
</if>
<choose>
<when test = "....">
and ...
</when>
</choose>
</where>
如图