WebRoot/WEB-INF/classes/com/itheima/mapper/CommentMapper.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.itheima.mapper.CommentMapper">
    <!--实体类与数据库映射字段部分-->
    <resultMap id="ResultMapComment" type="com.itheima.po.Comment">
        <result property="id" column="id" jdbcType="INTEGER"/>
        <result property="userId" column="userId" jdbcType="INTEGER"/>
        <result property="itemId" column="itemId" jdbcType="INTEGER"/>
        <result property="content" column="content" jdbcType="VARCHAR"/>
        <result property="addTime" column="addTime" jdbcType="TIMESTAMP"/>
        <association property="user" column="user_id" select="com.itheima.mapper.UserMapper.load"/>
    </resultMap>

    <!-- 声明数据库字段 -->
    <sql id="Comment_field">
        id,user_id,item_id,content,addTime
    </sql>

    <!-- 实体类属性-->
    <sql id="Comment_insert">
        #{id},#{userId},#{itemId},#{content},#{addTime}
    </sql>

    <!-- 更新结果  -->
    <sql id="Comment_update">
        <if test="userId != null">
            user_id = #{userId},
        </if>
        <if test="itemId != null">
            item_id = #{itemId},
        </if>
        <if test="content != null">
            content = #{content},
        </if>
        <if test="addTime != null">
            addTime = #{addTime}
        </if>
    </sql>

    <!-- 查询时条件   -->
    <sql id="Comment_where">
        <if test="id != null">
            and id = #{id}
        </if>
        <if test="userId != null">
            and user_id = #{userId}
        </if>
        <if test="itemId != null">
            and item_id = #{itemId}
        </if>
        <if test="content != null">
            and content = #{content}
        </if>
        <if test="addTime != null">
            and addTime = #{addTime}
        </if>
    </sql>

    <!--    新增        -->
    <!--    参数：实体类-->