我们在使用中MySQL的时候难免会遇到大批量数据inset的情况,通常最简单的方法就是写一个insert,然后通过循环给变量赋值,批量插入数据库:
//save rddform for (int i = 0; i < rddformlist.Count; i++) { string cmdText = "insert into rddform (ID,CreatedTime,ModifiedTime,CreatedBy,ModifiedBy,FormType) values ('" + rddformlist[i].RddFormGuid + "','" + rddformlist[i].CreateTime + "','" + rddformlist[i].ModifyTime + "','" + rddformlist[i].CreateBy + "','" + rddformlist[i].ModifyBy + "'," + rddformlist[i].FormType + ")"; MySqlCommand mysqlcom = new MySqlCommand(cmdText, mysqlcon); mysqlcom.Transaction = trans; //绑定事务 mysqlcom.ExecuteNonQuery(); }
经过方法经过亲测,性能不太好,本地大概是一秒insert20条数据,云上大概是一秒insert3条数据。两千条数据本地大概就要一分半,云上大概十几分,显然速度太慢了。
现在我们改为多条数据合并插入,就是用一个insert语句插入所有的数据:
//save rddform for (int i = 0; i < rddformlist.Count; i++) { strRddForm.Append("('" + rddformlist[i].RddFormGuid + "','" + rddformlist[i].CreateTime + "','" + rddformlist[i].ModifyTime + "','" + rddformlist[i].CreateBy + "','" + rddformlist[i].ModifyBy + "','" + rddformlist[i].FormType + "')"); if (i<rddformlist.Count-1) { strRddForm.Append(","); } } MySqlCommand rddformcom = new MySqlCommand(strRddForm.ToString(), mysqlcon); rddformcom.Transaction = trans; //绑定事务 rddformcom.ExecuteNonQuery();
亲测之后两千条本地真的是秒插,云上大概一秒多,这速度让人根本没有拒绝的理由,果断的把代码改了。当然速度可能根据个人机器以及网络环境因素有关,下面是网上牛人做的性能对比
注意事项:
SQL语句是有长度限制,在进行数据合并在同一SQL中务必不能超过SQL长度限制,通过max_allowed_packet配置可以修改,默认是1M,测试时修改为8M。
事务需要控制大小,事务太大可能会影响执行的效率。MySQL有innodb_log_buffer_size配置项,超过这个值会把innodb的数据刷到磁盘中,这时,效率会有所下降。所以比 较好的做法是,在数据达到这个这个值前进行事务提交。
以上就是MySQL数据库inset性能优化_MySQL的内容,更多相关内容请关注PHP中文网(www.php.cn)!

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