c# - SQL Server 2008——并行执行查询

Question

有没有一种简单的方法可以并行执行查询？我有一个类似这样的查询:

delete from TableA where id = @id
delete from TableB where id = @id
delete from TableC where id = @id
...

我想同时进行。我也可以使用 C#，但不确定如何使用。

Answer 1

第一个想法是拥有单独的线程和单独的连接，但我认为您可以使用异步回调在单个线程中管理多个连接:

string[] tables = new string[] { "TableA", "TableB", "TableC" ... };
var runningCommands = new List<SqlCommand>();
foreach(var table in tables)
{
  var conn = new SqlConnection(...);
  conn.Open();
  var cmd = new SqlCommand("DELETE FROM " + table + " WHERE id = @id");
  cmd.Parameters.Add(new SqlParameter("@id", id);
  cmd.BeginExecuteNonQuery(); 
  runningCommands.Add(cmd);
}
// now wait for all of them to finish executing
foreach(var cmd in runningCommands)
{
  cmd.EndExecuteNonQuery();
  cmd.Connection.Close();
}