springboot + mybatis 批量插入方法总结、问题及解决

第一种 XML里面定义好SQL

void  updateBatch(List userPermission);

   
      SELECT LAST_INSERT_ID()
   
   insert into user_permission ()
   values
   
      
         #{item.id,jdbcType=BIGINT},#{item.bid,jdbcType=BIGINT}, #{item.fid,jdbcType=BIGINT},#{item.buttonName,jdbcType=VARCHAR},#{item.buttonState,jdbcType=BIGINT},#{item.effective,jdbcType=BIGINT},#{item.createAt,jdbcType=TIMESTAMP}
      
   
 


   id,bid,fid,button_Name,button_state,effective,create_at

selectKey是用来自增长主键Id，如果使用的mybatis3.3.*以下的版本是有自增长的bug，mybatis3.3.*以上的版本是修复了该bug.

第二种 在Mapper里自定义Provider

import java.text.MessageFormat;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.annotations.InsertProvider;
public interface StudentMapper {
    @InsertProvider(type = Provider.class, method = "batchInsert")
    int batchInsert(List students);
    
    class Provider {
        /* 批量插入 */
        public String batchInsert(Map map) {
            List students = (List) map.get("list");
            StringBuilder sb = new StringBuilder();
            sb.append("INSERT INTO student (name,sex,addr) VALUES ");
            MessageFormat mf = new MessageFormat(
                    "(#'{'list[{0}].name}, #'{'list[{0}].sex}, #'{'list[{0}].addr})"
            );
            for (int i = 0; i < students.size(); i++) {
                sb.append(mf.format(new Object[] {i}));
                if (i < students.size() - 1)
                    sb.append(",");
            }
            return sb.toString();
        }
}

问题及解决
SqlServer 对语句的条数和参数的数量都有限制，分别是 1000 和 2100。
Mysql 对语句的长度有限制，默认是 4M。 这个错误是 Mysql 的JDBC包抛出的。
Mybatis 对动态语句没有数量上的限制。
SqlServer解决：分批次插入

@Service
public class TempServiceImpl implements ITempService {
 
    @Autowired
     private  SqlSessionFactory sqlSessionFactory;
 
 
    @Override
    @Transactional
    public boolean save(List autoBatcyList) {
        boolean flag = false;
        try( SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH);) {
            //由于数据库对于插入字段的限制，在这里对批量插入的数据进行分批处理
            int batchCount =120;//每批commit的个数
            int batchLastIndex = batchCount - 1;// 每批最后一个的下标
            for (int index = 0; index < autoBatcyLIst.size() - 1;) {
                if (batchLastIndex > autoBatcyList.size() - 1) {
                    batchLastIndex = autoBatcyList.size() - 1;
                    sqlSession.insert("com.demo.dao.ITempDao.save", autoBatcyList.subList(index, batchLastIndex + 1));
                    sqlSession.commit();
                    break;// 数据插入完毕,退出循环
                } else {
                    sqlSession.insert("com.demo.dao.ITempDao.save", autoBatcyList.subList(index, batchLastIndex + 1));
                    sqlSession.commit();
                    index = batchLastIndex + 1;// 设置下一批下标
                    batchLastIndex = index + (batchCount - 1);
                }
            }
 
            sqlSession.commit();
            flag = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return flag;
    }
}

        
            insert into
            demo(name,age,address,school,addtime)
            values (#{item.name},#{item.age},#{item.address},#{item.school},GETDATE())
        
    

参考：https://blog.csdn.net/qq_24607837/article/details/81381934

Mysql解决：

## 查询当前大小
mysql> select @@max_allowed_packet;
+----------------------+
| @@max_allowed_packet |
+----------------------+
|              4194304 |
+----------------------+
1 row in set (0.00 sec)
 
## 修改为256M
mysql> SET GLOBAL max_allowed_packet=268435456;
Query OK, 0 rows affected (0.00 sec)
 
## 退出客户端重新登录
mysql> select @@max_allowed_packet;
+----------------------+
| @@max_allowed_packet |
+----------------------+
|            268435456 |
+----------------------+
1 row in set (0.00 sec)