DateTime begin = DateTime.Now;
string connectionString = ......;
using(SqlConnection conn = new SqlConnection(connectionString))...{
conn.Open();
SqlDataAdapter sd = new SqlDataAdapter();
sd.SelectCommand = new SqlCommand("select devid,data_time,data_value from CurrentTest", conn);
sd.InsertCommand = new SqlCommand("insert into CurrentTest (devid,data_time,data_value) "
+ " values (@devid,@data_time,@data_value);", conn);
sd.InsertCommand.Parameters.Add("@devid", SqlDbType.Char, 18, "devid");
sd.InsertCommand.Parameters.Add("@data_time", SqlDbType.Char, 19, "data_time");
sd.InsertCommand.Parameters.Add("@data_value", SqlDbType.Int, 8, "data_value");
sd.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
sd.UpdateBatchSize = 0;
DataSet dataset = new DataSet();
sd.Fill(dataset);
Random r = new Random(1000);
for (int i = 0; i < 100000; i++) ...{
object[] row = ...{"DEVID"+i,DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),r.Next(1,1000) };
dataset.Tables[0].Rows.Add(row);
if (i % 300 == 0) ...{
sd.Update(dataset.Tables[0]);
dataset.Tables[0].Clear();
}
}
sd.Update(dataset.Tables[0]);
dataset.Tables[0].Clear();
sd.Dispose();
dataset.Dispose();
conn.Close();
调整思路,先从数据库中取200条(批更新的Size大小),直接得到一个Original的DataTable.
sd.SelectCommand = new SqlCommand("select top 200 devid,data_time,data_value from CurrentTest", conn);
DataSet dataset = new DataSet();
sd.Fill(dataset);
用这200个空间来放要更新的其它数据看看:
for (int i = 0; i < 100; i++)
{
dataset.Tables[0].Rows[i].BeginEdit();
dataset.Tables[0].Rows[i]["data_time"] = "2222-22-22 22:22:22";
dataset.Tables[0].Rows[i]["data_value"] = 100;
dataset.Tables[0].Rows[i]["devid"] = "DEVID"+(i+10000);//更新DEVID10000到DEVID10200的记录
dataset.Tables[0].Rows[i].EndEdit();
}
sd.Update(dataset.Tables[0]);
OK,成功,哈哈.把要更新的数据不断往这个空间填,填满就提交,这样更新100000条数据只要几个循环就行了.
DateTime begin = DateTime.Now;
string connectionString = "";
using(SqlConnection conn = new SqlConnection(connectionString))...{
conn.Open();
SqlDataAdapter sd = new SqlDataAdapter();
sd.SelectCommand = new SqlCommand("select top 200 devid,data_time,data_value from CurrentTest", conn);
DataSet dataset = new DataSet();
sd.Fill(dataset);
Random r = new Random(1000);