mysql 批量新增，修改

批量新增
<insert id="insertList">
  insert into sea_user (id, username,`time`)
  values
  <foreach collection="list" item="item" index="index" separator=",">
    (replace(uuid(),"-",""), #{item.username}, #{item.time})
  </foreach>
</insert>

注释

list　　传过来的集合对象

item="item" 　"item" 遍历的集合中的每个对象

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新增返回主键id （useGeneratedKeys="true" keyProperty="id"）

<insert id="insert" parameterType="com.mmall.pojo.Shipping" useGeneratedKeys="true" keyProperty="id">
  insert into mmall_shipping (id, user_id, receiver_name, 
    receiver_phone, receiver_mobile, receiver_province, 
    receiver_city, receiver_district, receiver_address, 
    receiver_zip, create_time, update_time
    )
  values (#{id,jdbcType=INTEGER}, #{userId,jdbcType=INTEGER}, #{receiverName,jdbcType=VARCHAR}, 
    #{receiverPhone,jdbcType=VARCHAR}, #{receiverMobile,jdbcType=VARCHAR}, #{receiverProvince,jdbcType=VARCHAR}, 
    #{receiverCity,jdbcType=VARCHAR}, #{receiverDistrict,jdbcType=VARCHAR}, #{receiverAddress,jdbcType=VARCHAR}, 
    #{receiverZip,jdbcType=VARCHAR}, now(), now()
    )
</insert>

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批量修改
list  - 传过来的数据集合，使用注解
goods_id 表中数据
goodsId 对应的实体类属性

<update id="updateBatchStock">
  update
    goods
  set
    goods_stock =
    <foreach collection="list" item="item" index="index" separator=" " open="case goods_id" close="end">
        when #{item.goodsId} then goods_stock - #{item.quantity}
    </foreach>
    ,goods_sales_quantity =
    <foreach collection="list" item="item" index="index" separator=" " open="case goods_id" close="end">
        when #{item.goodsId} then goods_sales_quantity + #{item.quantity}
    </foreach>
    where goods_id in
    <foreach collection="list" index="index" item="item" separator="," open="(" close=")">
        #{item.goodsId}
    </foreach>
</update>