快速插入資料

主要思想是通過在客戶端把資料都快取在Table中，然後利用SqlBulkCopy一次性把Table中的資料插入到資料庫

    public static void BulkToDB(DataTable dt)  
    {  
        SqlConnection sqlConn = new SqlConnection(  
            ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString);  
        SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConn);  
        bulkCopy.DestinationTableName = "BulkTestTable";  
        bulkCopy.BatchSize = dt.Rows.Count;  
      
        try  
        {  
            sqlConn.Open();  
        if (dt != null && dt.Rows.Count != 0)  
            bulkCopy.WriteToServer(dt);  
        }  
        catch (Exception ex)  
        {  
            throw ex;  
        }  
        finally  
        {  
            sqlConn.Close();  
            if (bulkCopy != null)  
                bulkCopy.Close();  
        }  
    }  
      
    public static DataTable GetTableSchema()  
    {  
        DataTable dt = new DataTable();  
        dt.Columns.AddRange(new DataColumn[]{  
            new DataColumn("Id",typeof(int)),  
            new DataColumn("UserName",typeof(string)),  
        new DataColumn("Pwd",typeof(string))});  
      
        return dt;  
    }  
      
    static void Main(string[] args)  
    {  
        Stopwatch sw = new Stopwatch();  
        for (int multiply = 0; multiply < 10; multiply++)  
        {  
            DataTable dt = Bulk.GetTableSchema();  
            for (int count = multiply * 100000; count < (multiply + 1) * 100000; count++)  
            {  
                DataRow r = dt.NewRow();  
                r[0] = count;  
                r[1] = string.Format("User-{0}", count * multiply);  
                r[2] = string.Format("Pwd-{0}", count * multiply);  
                dt.Rows.Add(r);  
            }  
            sw.Start();  
            Bulk.BulkToDB(dt);  
            sw.Stop();  
            Console.WriteLine(string.Format("Elapsed Time is {0} Milliseconds", sw.ElapsedMilliseconds));  
        }  
      
        Console.ReadLine();  
    }  
 

耗時圖如下：

最後再看看使用表值引數的效率，會另你大為驚訝的。

表值引數是SQL Server 2008新特性，簡稱TVPs。對於表值引數不熟悉的朋友，可以參考最新的book online，我也會另外寫一篇關於表值引數的部落格，不過此次不對錶值引數的概念做過多的介紹。言歸正傳，看程式碼：

    public static void TableValuedToDB(DataTable dt)  
    {  
        SqlConnection sqlConn = new SqlConnection(  
          ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString);  
        const string TSqlStatement =  
         "insert into BulkTestTable (Id,UserName,Pwd)" +  
         " SELECT nc.Id, nc.UserName,nc.Pwd" +  
         " FROM @NewBulkTestTvp AS nc";  
        SqlCommand cmd = new SqlCommand(TSqlStatement, sqlConn);  
        SqlParameter catParam = cmd.Parameters.AddWithValue("@NewBulkTestTvp", dt);  
        catParam.SqlDbType = SqlDbType.Structured;  
        //表值引數的名字叫BulkUdt，在上面的建立測試環境的SQL中有。  
        catParam.TypeName = "dbo.BulkUdt";  
        try  
        {  
          sqlConn.Open();  
          if (dt != null && dt.Rows.Count != 0)  
          {  
              cmd.ExecuteNonQuery();  
          }  
        }  
        catch (Exception ex)  
        {  
          throw ex;  
        }  
        finally  
        {  
          sqlConn.Close();  
        }  
    }  
      
    public static DataTable GetTableSchema()  
    {  
        DataTable dt = new DataTable();  
        dt.Columns.AddRange(new DataColumn[]{  
          new DataColumn("Id",typeof(int)),  
          new DataColumn("UserName",typeof(string)),  
          new DataColumn("Pwd",typeof(string))});  
      
        return dt;  
    }  
      
    static void Main(string[] args)  
    {  
        Stopwatch sw = new Stopwatch();  
        for (int multiply = 0; multiply < 10; multiply++)  
        {  
            DataTable dt = TableValued.GetTableSchema();  
            for (int count = multiply * 100000; count < (multiply + 1) * 100000; count++)  
            {          
                DataRow r = dt.NewRow();  
                r[0] = count;  
                r[1] = string.Format("User-{0}", count * multiply);  
                r[2] = string.Format("Pwd-{0}", count * multiply);  
                dt.Rows.Add(r);  
            }  
            sw.Start();  
            TableValued.TableValuedToDB(dt);  
            sw.Stop();  
            Console.WriteLine(string.Format("Elapsed Time is {0} Milliseconds", sw.ElapsedMilliseconds));  
        }  
      
        Console.ReadLine();  
    }  
 

比Bulk還快5秒。