mybatis异常Mapper method attempted to return null from a method with a primitive re
org.apache.ibatis.binding.BindingException: Mapper method attempted to return null from a method with a primitive return type (int).
错误写法：
<select id="updatePayoffStatusById" resultType="int">update bu_payoff set payoff_status = #{payoffStatus} where id = #{id}
</select>int updatePayoffStatusById(@Param("id") Integer id, @Param("payoffStatus") Integer payoffStatus);正确写法：
<select id="updatePayoffStatusById" >update bu_payoff set payoff_status = #{payoffStatus} where id = #{id}
</select>void updatePayoffStatusById(@Param("id") Integer id, @Param("payoffStatus") Integer payoffStatus);
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