HotelDemo/src/main/resources/dataImpl/user/OrderMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.hotel.data.user.OrderMapper">

    <insert id="insertOrder" parameterType="com.example.hotel.po.Order"
            useGeneratedKeys="true" keyProperty="id">
        insert into Order(id,userId,hotelId,checkInDate,checkOutDate,roomType,roomNum,peopleNum,haveChild,createDate)
        values (#{id},#{userId},#{checkInDate},#{checkOutDate},#{roomType},#{roomNum},#{peopleNum},#{haveChild},#{createDate})
    </insert>
    <select id="selectAllOrder" resultMap="Order">
        select * from Order
    </select>

    <resultMap id="Order" type="com.example.hotel.po.Order">
    </resultMap>
</mapper>