mybatis3 多条件查询的xml写法

多条件查询时，用<where>

<select id="findAllSelective" resultMap="BaseResultMap">
select
"Base_Column_List" />
from sys_user
<where>
<if test="id != null">
and id = #{id,jdbcType=BIGINT}
if>
<if test="username != null">
and username = #{username,jdbcType=VARCHAR}
if>
where>
select>

https://blog.csdn.net/thris/article/details/84810974