一丶 @Param注解单一属性
User selectUser(@Param(“userId”) String id);
对应xml中的参数就需要是用我们注解中的名字
<select id=" selectUser" resultMap="BaseResultMap">
select * from user where id = #{userId，jdbcType=VARCHAR}
</select>
二丶@Param注解JavaBean对象
int updateByExampleSelective(@Param("record") PayShopCompanyCharge record, @Param("example") PayShopCompanyChargeExample example);
这时在xml中就可以用record.id 来获取参数
<update id="updateByExample" parameterType="map">
<!--
@mbggenerated
This element is automatically generated by MyBatis Generator,Do not modify ! Generated on Fri Nov 30 10:43:29 CST 2018.
-->
update user
set name = #{record.name,jdbcType=VARCHAR}
where
where id = #{record.id,jdbcType=BIGINT}
</update>