useGeneratedKeys="true" keyProperty="id">

sql全部内容：

<insert id="insertSelective" parameterType="com.gblfy.mall.pojo.Shipping" useGeneratedKeys="true" keyProperty="id">insert into mall_shipping<trim prefix="(" suffix=")" suffixOverrides=","><if test="id != null">id,</if><if test="userId != null">user_id,</if><if test="receiverName != null">receiver_name,</if><if test="receiverPhone != null">receiver_phone,</if><if test="receiverMobile != null">receiver_mobile,</if><if test="receiverProvince != null">receiver_province,</if><if test="receiverCity != null">receiver_city,</if><if test="receiverDistrict != null">receiver_district,</if><if test="receiverAddress != null">receiver_address,</if><if test="receiverZip != null">receiver_zip,</if></trim><trim prefix="values (" suffix=")" suffixOverrides=","><if test="id != null">#{id,jdbcType=INTEGER},</if><if test="userId != null">#{userId,jdbcType=INTEGER},</if><if test="receiverName != null">#{receiverName,jdbcType=VARCHAR},</if><if test="receiverPhone != null">#{receiverPhone,jdbcType=VARCHAR},</if><if test="receiverMobile != null">#{receiverMobile,jdbcType=VARCHAR},</if><if test="receiverProvince != null">#{receiverProvince,jdbcType=VARCHAR},</if><if test="receiverCity != null">#{receiverCity,jdbcType=VARCHAR},</if><if test="receiverDistrict != null">#{receiverDistrict,jdbcType=VARCHAR},</if><if test="receiverAddress != null">#{receiverAddress,jdbcType=VARCHAR},</if><if test="receiverZip != null">#{receiverZip,jdbcType=VARCHAR},</if></trim></insert>