src/com/javapandeng/mapper/CarMapper.xml

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<?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.javapandeng.mapper.CarMapper">
    <!--实体类与数据库映射字段部分-->
    <resultMap id="ResultMapCar" type="com.javapandeng.po.Car">
        <result property="id" column="id" jdbcType="INTEGER"/>
        <result property="itemId" column="item_id" jdbcType="INTEGER"/>
        <result property="userId" column="user_id" jdbcType="INTEGER"/>
        <result property="num" column="num" jdbcType="INTEGER"/>
        <result property="price" column="price" jdbcType="DECIMAL"/>
        <result property="total" column="total" jdbcType="VARCHAR"/>
    </resultMap>

    <resultMap id="ResultMapCarDto" type="com.javapandeng.po.Car">
        <result property="id" column="id" jdbcType="INTEGER"/>
        <result property="itemId" column="item_id" jdbcType="INTEGER"/>
        <result property="userId" column="user_id" jdbcType="INTEGER"/>
        <result property="num" column="num" jdbcType="INTEGER"/>
        <result property="price" column="price" jdbcType="DECIMAL"/>
        <result property="total" column="total" jdbcType="VARCHAR"/>
        <association property="item" column="item_id" select="com.javapandeng.mapper.ItemMapper.load"/>
    </resultMap>

    <!-- 声明数据库字段 -->
    <sql id="Car_field">
        id,item_id,user_id,num,price,total
    </sql>

    <!-- 实体类属性-->
    <sql id="Car_insert">
        #{id},#{itemId},#{userId},#{num},#{price},#{total}
    </sql>

    <!-- 更新结果  -->
    <sql id="Car_update">
        <if test="itemId != null">
            item_id = #{itemId},
        </if>
        <if test="userId != null">
            user_id = #{userId},
        </if>
        <if test="num != null">
            num = #{num},
        </if>
        <if test="price != null">
            price = #{price},
        </if>
        <if test="total != null">
            total = #{total},
        </if>

    </sql>

    <!-- 查询时条件   -->
    <sql id="Car_where">
        <if test="id != null">
            and id = #{id}
        </if>
        <if test="itemId != null">
            and item_id = #{itemId}