MyBatis 新增获取自增主键的小坑

@Mapper中
Integer addHugong(@Param("hg") Hugong hg);

.xml中 如果传入是带了参数名，返回主键值时也需要带着才能返回去
<insert id="addHugong" parameterType="com.shiro.shirodemo.entity.Hugong"
        useGeneratedKeys="true" keyProperty="hg.id"  keyColumn="id">
    insert into sys_hugong
    <trim prefix="(" suffix=")" suffixOverrides=",">
        <if test="hg.name != null">
            name,
        </if>
        <if test="hg.sex != null">
            sex,
        </if>
        <if test="hg.sfz != null">
            sfz,
        </if>
        <if test="hg.phone != null">
            phone,
        </if>
        <if test="hg.level != null">
            level,
        </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
        <if test="hg.name != null">
            #{hg.name,jdbcType=VARCHAR},
        </if>
        <if test="hg.sex != null">
            #{hg.sex,jdbcType=VARCHAR},
        </if>
        <if test="hg.sfz != null">
            #{hg.sfz,jdbcType=VARCHAR},
        </if>
        <if test="hg.phone != null">
            #{hg.phone,jdbcType=VARCHAR},
        </if>
        <if test="hg.level != null">
            #{hg.level,jdbcType=VARCHAR},
        </if>
    </trim>
</insert>