數據表：meal_info

映射類：MealInfo

批量插入或更新的集合：List<MealInfo> mealInfos

mapper方法：

mealInfoMapper.insertList(mealInfos);

mealInfoMapper.updateList(mealInfos);

映射文件：

<?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.mapper.MealInfoMapper" >  <resultMap id="BaseResultMap" type="com.entity.MealInfo" >    <id column="id" PRoperty="id" jdbcType="INTEGER" />    <result column="name" property="name" jdbcType="VARCHAR" />    <result column="gender" property="gender" jdbcType="VARCHAR" />    <result column="energy" property="energy" jdbcType="DOUBLE" />    <result column="protein" property="protein" jdbcType="DOUBLE" />    <result column="fat" property="fat" jdbcType="DOUBLE" />    <result column="cho" property="cho" jdbcType="DOUBLE" />    <result column="createDate" property="createdate" jdbcType="TIMESTAMP" />    <result column="updateDate" property="updatedate" jdbcType="TIMESTAMP" />  </resultMap>       <update id="updateList" parameterType="java.util.List">	  update meal_info set	    energy=	  <foreach collection="list" item="item" index="index" separator=" " open="case ID" close="end">	      when #{item.id,jdbcType=DECIMAL} then #{item.energy,jdbcType=VARCHAR}	  </foreach>	  ,protein=	  <foreach collection="list" item="item" index="index" separator=" " open="case ID" close="end">	      when #{item.id,jdbcType=DECIMAL} then #{item.protein,jdbcType=VARCHAR}	  </foreach>	  ,fat=	  <foreach collection="list" item="item" index="index" separator=" " open="case ID" close="end">	      when #{item.id,jdbcType=DECIMAL} then #{item.fat,jdbcType=VARCHAR}	  </foreach>	  ,cho=	  <foreach collection="list" item="item" index="index" separator=" " open="case ID" close="end">	      when #{item.id,jdbcType=DECIMAL} then #{item.cho,jdbcType=VARCHAR}	  </foreach>	  where ID in	  <foreach collection="list" index="index" item="item" separator="," open="(" close=")">	      #{item.id,jdbcType=DECIMAL}	  </foreach>  </update>    <insert id="insertList" parameterType="java.util.List">      <selectKey resultType="long" keyProperty="id" order="AFTER">          SELECT          LAST_INSERT_ID()      </selectKey>      insert into meal_info    (id, name, gender,energy,protein,fat,cho,createDate, updateDate)      values    <foreach collection="list" item="item" index="index" separator="," >          (#{item.id},#{item.name},#{item.gender},#{item.energy},#{item.protein},        #{item.fat},#{item.cho},now(),now())      </foreach>    </insert>