拓展mybatisPlus服务实现类方法，批量插入时，唯一索引冲突后更新

package com.zk.fahai.common.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface FhId {}

package com.zk.fahai.util;

import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.baomidou.mybatisplus.core.mapper.baseMapper;
import com.baomidou.mybatisplus.core.metadata.TableFieldInfo;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
import com.baomidou.mybatisplus.core.toolkit.Assert;
import com.baomidou.mybatisplus.core.toolkit.ReflectionKit;
import com.baomidou.mybatisplus.extension.service.IService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zk.fahai.common.annotation.FhId;
import com.zk.fx.common.util.JsonUtils;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.transaction.annotation.Transactional;

  
  @Transactional(rollbackFor = Exception.class)
  public void saveOrUpdateBatchByFhId(Collection entityList) throws IOException {
    TableInfo tableInfo = TableInfoHelper.getTableInfo(entityClass);
    Assert.notNull(
        tableInfo, "error: can not execute. because can not find cache of TableInfo for entity!");

    List ukFieldNameList =
        tableInfo.getFieldList().stream()
            .filter(c -> c.getField().isAnnotationPresent(FhId.class))
            .map(tableFieldInfo -> tableFieldInfo.getField().getName())
            .collect(Collectors.toList());
    if (ukFieldNameList.size() < 1) {
      logger.error("未找到唯一索引，class：{}", tableInfo.getEntityType());
      return;
    }
    for (List list : this.cutList(entityList, IService.DEFAULT_BATCH_SIZE)) {
      try {
        super.saveBatch(list);
      } catch (DuplicateKeyException duplicateKeyException) {
        for (T entity : list) {
          try {
            super.save(entity);
          } catch (DuplicateKeyException e2) {
            logger.info("数据更新触发唯一索引，对象：{}", JsonUtils.object2JsonString(entity));
            UpdateWrapper updateWrapper = new UpdateWrapper<>();
            ukFieldNameList.forEach(
                uk -> updateWrapper.eq(uk, ReflectionKit.getFieldValue(entity, uk)));
            super.update(entity, updateWrapper);
          }
        }
      }
    }
  }

  
  public  List> cutList(Collection list, int maxNum) {
    int step = (list.size() + maxNum - 1) / maxNum;
    return Stream.iterate(0, n -> n + 1)
        .limit(step)
        .parallel()
        .map(
            a ->
                list.stream()
                    .skip(a * maxNum)
                    .limit(maxNum)
                    .parallel()
                    .collect(Collectors.toList()))
        .collect(Collectors.toList());
  }
}