方法1：concat

<where>
    <trim  suffixOverrides="," >
        <if test="id != null and id != ''" >
            and id =  #{id}
        </if>
        <if test="name != null and name != ''" >
            and name like concat('%',#{name},'%')
        </if>
    </trim>
</where>

方法2：${}

<if test="examTypeName!=null and examTypeName!=''">
    and exam_type_name like '%${examTypeName}%'
</if>

方法3：#{}

<if test="examTypeName!=null and examTypeName!=''">
    and exam_type_name like "%"#{examTypeName}"%"
</if>

参考文章

• mybatis中xml开发like的几种写法