以下代码将在我的数据库中插入一些值。它获得6个随机值,将数据放入数组中,然后将其插入数据库中。
public void LottoTest(object sender, EventArgs e)
{
Dictionary<int, int> numbers = new Dictionary<int, int>();
Random generator = new Random();
while (numbers.Count < 6)
{
numbers[generator.Next(1, 49)] = 1;
}
string[] lotto = numbers.Keys.OrderBy(n => n).Select(s => s.ToString()).ToArray();
foreach (String _str in lotto)
{
Response.Write(_str);
Response.Write(",");
}
var connectionstring = "Server=C;Database=lotto;User Id=lottoadmin;Password=password;";
using (var con = new SqlConnection(connectionstring)) // Create connection with automatic disposal
{
con.Open();
using (var tran = con.BeginTransaction()) // Open a transaction
{
// Create command with parameters (DO NOT PUT VALUES IN LINE!!!!!)
string sql =
"insert into CustomerSelections(val1,val2,val3,val4,val5,val6) values (@val1,@val2,@val3,@val4,@val5,@val6)";
var cmd = new SqlCommand(sql, con);
cmd.Parameters.AddWithValue("val1", lotto[0]);
cmd.Parameters.AddWithValue("val2", lotto[1]);
cmd.Parameters.AddWithValue("val3", lotto[2]);
cmd.Parameters.AddWithValue("val4", lotto[3]);
cmd.Parameters.AddWithValue("val5", lotto[4]);
cmd.Parameters.AddWithValue("val6", lotto[5]);
cmd.Transaction = tran;
cmd.ExecuteNonQuery(); // Insert Record
tran.Commit(); // commit transaction
Response.Write("<br />");
Response.Write("<br />");
Response.Write("Ticket has been registered!");
}
}
}
将MASS条目循环并插入数据库的最佳方法是什么。可以说,C#的100,000条记录?我希望能够通过我的方法生成随机数并利用我也有的插入..
答案 0 :(得分:8)
对于真正的大型插页,SqlBulkCopy
是您的朋友。执行此操作的简单但低效的方法只是使用数据填充DataTable
,然后将其放在SqlBulkCopy
,但它可以快两倍(相信我,我已经定时)通过欺骗IDataReader
。为方便起见,我最近将此代码移至FastMember,因此您可以执行以下操作:
class YourDataType {
public int val1 {get;set;}
public string val2 {get;set;}
... etc
public DateTime val6 {get;set;}
}
然后创建一个迭代器块(即一个非缓冲转发器只读取器):
public IEnumerable<YourDataType> InventSomeData(int count) {
for(int i = 0 ; i < count ; i++) {
var obj = new YourDataType {
... initialize your random per row values here...
}
yield return obj;
}
}
然后:
var data = InventSomeData(1000000);
using(var bcp = new SqlBulkCopy(connection))
using(var reader = ObjectReader.Create(data))
{ // note that you can be more selective with the column map
bcp.DestinationTableName = "CustomerSelections";
bcp.WriteToServer(reader);
}
答案 1 :(得分:1)
您需要Sql批量插入。 msdn http://blogs.msdn.com/b/nikhilsi/archive/2008/06/11/bulk-insert-into-sql-from-c-app.aspx
上有一个很好的教程答案 2 :(得分:1)
基本上,您使用要放入SqlServer的数据填充数据表。
DataTable tvp = new DataTable("LottoNumbers");
forach(var numberSet in numbers)
// add the data to the dataset
然后使用类似于此的代码通过ADO传递数据......
command.Parameters.Add("@CustomerLottoNumbers", SqlDbType.Structured);
command.Parameters["CustomerLottoNumbers"].Value = tvp;
然后你可以使用与此类似的SQL ...
INSERT CustomerSelections
SELECT * from @CustomerLottoNumbers