code: public int[] batchUpdate(String tableName, List<Record> recordList, int batchSize) {
      	return batchUpdate(tableName, config.dialect.getDefaultPrimaryKey(),recordList, batchSize);
      }
docs: Batch update records with default primary key, using the columns names of the first record in recordList.
  Ensure all the records can use the same sql as the first record.
  @param tableName the table name