c# 快速 将大量数据插入数据库_c# 将类与数据库快速插入

快速插入数据

主要思想是通过在客户端把数据都缓存在Table中，然后利用SqlBulkCopy一次性把Table中的数据插入到数据库

    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();  
    }  

耗时图如下：

最后再看看使用表值参数的效率，会另你大为惊讶的。

 

表值参数是SQL Server 2008新特性，简称TVPs。对于表值参数不熟悉的朋友，可以参考最新的book online，我也会另外写一篇关于表值参数的博客，不过此次不对表值参数的概念做过多的介绍。言归正传，看代码：

    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;  
        //表值参数的名字叫BulkUdt，在上面的建立测试环境的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还快5秒。