Question

请告诉我如何更快地制作下一个代码（我的意思是方法WriteToBase）。

class MyClass
{
public int a;
public int b;
public int c;
}
void main()
{
List<MyClass> mc=new List<MyClass>();
mc.Add(new MyClass()); //example
mc.Add(new MyClass());

WriteToBase(mc);
}
void WriteToBase(List<MyClass> mc)
{
//Create Connection

string sqlIns = "INSERT INTO table (name, information, other) VALUES (@name,           @information, @other)";

SqlCommand cmdIns = new SqlCommand(sqlIns, Connection);
for(int i=0;i<mc.Count;i++)
{
    cmdIns.Parameters.Add("@name", mc[i].a);
    cmdIns.Parameters.Add("@information", mc[i].b);
    cmdIns.Parameters.Add("@other", mc[i].c);
    cmdIns.ExecuteNonQuery();
}
}
}

有什么想法吗？

Answer 1

您目前正在多次访问数据库。所有插页应该只有1次点击。

试试这段代码：

void WriteToBase(List<MyClass> mc)
{
  //Create Connection
  using (TransactionScope scope = new TransactionScope())
  {
    string sqlIns = "INSERT INTO table (name, information, other) 
                     VALUES (@name, @information, @other)";

    SqlCommand cmdIns = new SqlCommand(sqlIns, Connection);

    for(int i=0;i<mc.Count;i++)
    {
      cmdIns.Parameters.Add("@name", mc[i].a);
      cmdIns.Parameters.Add("@information", mc[i].b);
      cmdIns.Parameters.Add("@other", mc[i].c);
      cmdIns.ExecuteNonQuery();
    }
    scope.Complete();    
  }
}

Answer 2

使用SqlBulkCopy。它可以让您高效地批量加载包含来自其他来源的数据的 SQL Server 表。

private static void WriteToBase(IEnumerable<MyClass> myClasses)
    {
        var dataTable = new DataTable();
        dataTable.Columns.Add("name", typeof(string));
        dataTable.Columns.Add("information", typeof(string));
        dataTable.Columns.Add("other", typeof(string));

        foreach (var myClass in myClasses)
        {
            var row = dataTable.NewRow();
            row["name"] = myClass.name;
            row["information"] = myClass.information;
            row["other"] = myClass.other;
            dataTable.Rows.Add(row);
        }

        using var connection = new SqlConnection(Constants.YourConnectionString);
        connection.Open();
        using var bulk = new SqlBulkCopy(connection) {DestinationTableName = "table" };
        bulk.WriteToServer(dataTable);
    }

Answer 3

void WriteToBase(List<MyClass> mc)
{
  //Create Connection
  using (TransactionScope scope = new TransactionScope())
  {
    string sqlIns = "INSERT INTO table (name, information, other) 
                     VALUES (@name, @information, @other)";

    SqlCommand cmdIns = new SqlCommand(sqlIns, Connection);

    for(int i=0;i<mc.Count;i++)
    {
      cmdIns.Parameters.AddWithValue("@name", mc[i].a);
      cmdIns.Parameters.AddWithValue("@information", mc[i].b);
      cmdIns.Parameters.AddWithValue("@other", mc[i].c);
      cmdIns.ExecuteNonQuery();
      cmdIns.Parameters.Clear();
    }
    scope.Complete();    
  }
}

将List <object>写入数据库的速度有多快？</object>

3 个答案: