【SpringBoot】批量插入数据

批量插入大量数据

• 问题
  最近使用Spring-Boot遇到一个问题，当向数据库批量插入数据时，如果数据量过大会报错
  MutationState size is bigger than maximum allowed number of bytes

• 解决

    @PersistenceContext
    private EntityManager em;
    
    @Override
    @Transactional
    public <T> void saveList(List<T> list) throws SQLException {
        if (list == null || list.isEmpty()) {
            return ;
        }
        int size = list.size();
        Connection connection = em.unwrap(SessionImpl.class).connection();
        for (int i = 0; i < list.size(); ++i) {
            System.out.println("正在保存第：" + i + "条数据*************************************");
            em.persist(list.get(i));
            if (i % 10000 == 0 || i == list.size()) {
                em.flush();
                em.clear();
                connection.commit();
            }
        }
    }