MyBatis 实现批量插入和删除中双层循环的写法案例

public int batchDelPrice(@Param("deleteList")List<Map<String, Object>> deleteList);

List<String> deletePriceId = getDelPriceId(oriPriceId,nowPriceId);
Map<String,Object> deleteMap = new HashMap<String,Object>();
deleteMap.put("userCode", userCode);
deleteMap.put("delete", deletePriceId);
deleteList.add(deleteMap);

<delete id="batchDelPrice" parameterType="java.util.ArrayList">
  <foreach collection="deleteList" item="deleteItem" separator=";">
  delete from xxx
  where user_code = #{deleteItem.userCode} 
  and product_id in 
  <foreach collection="deleteItem.delete" item="item" index="index" open="(" close=")" separator=",">
   #{item}
  </foreach>
 </foreach>
</delete>

public int batchAddPrice(@Param("addList")List<Map<String, Object>> newAddList);

List<Map<String,Object>> newAddList = new ArrayList<Map<String,Object>>();
 for(int i = 0; i < addList.size(); i++){
 Map<String,Object> userMap = addList.get(i);
 //获取需要增加的产品id集合
 List<String> priceIds = (List<String>) userMap.get("add");
 List<Map<String,Object>> priceList = new ArrayList<Map<String,Object>>();
 //遍历产品id集合，取相应的产品默认价格，组装成一个新的产品+默认价格集合
 for(int j = 0; j < priceIds.size(); j++){
  Map<String,Object> priceMap = new HashMap<String,Object>();
  String priceId = priceIds.get(j);
  //取相应产品id的默认价格
  double defPrice = productDefPrice.get(Integer.valueOf(priceId)).get("default_price");
  priceMap.put("priceId", priceId);
  priceMap.put("defPrice", defPrice);
  priceList.add(priceMap);
 }
 userMap.put("priceList", priceList);
 newAddList.add(userMap);
}

<insert id="batchAddPrice" parameterType="java.util.ArrayList">
 insert into xxx(
 user_code,product_id,price,efftime,index_num,pubtime
 )values
  <foreach collection="addList" item="addItem" separator="," >
  <foreach collection="addItem.priceList" item="priceItem" index="priceIndex" separator=",">
  (
   #{addItem.userCode},#{priceItem.priceId},#{priceItem.defPrice},now(),1,now()
  )
  </foreach>
  </foreach>
</insert>

@MapKey("product_id") 
public Map<Integer,Map<Integer,Double>> queryProductDefPrice();

<select id="queryProductDefPrice" resultType="java.util.HashMap">
 select product_id,default_price from xxx
</select>

 <insert id="insertOneSheet" parameterType="map">
 <foreach collection = "lineList" item ="item" index ="index">
 insert into ${table}(${lineColumn}) values
 (<foreach collection="item" index ="key" item="_value" separator=",">
  #{_value}
 </foreach>)
 </foreach>
 </insert>