SqlBulkCopy使用记录

MSDN:

Microsoft SQL Server includes a popular command-prompt utility named bcp for moving data from one table to another, whether on a single server or between servers. The SqlBulkCopy class lets you write managed code solutions that provide similar functionality. There are other ways to load data into a SQL Server table (INSERT statements, for example), but SqlBulkCopy offers a significant performance advantage over them.

The SqlBulkCopy class can be used to write data only to SQL Server tables. However, the data source is not limited to SQL Server; any data source can be used, as long as the data can be loaded to a DataTable instance or read with a IDataReader instance.

    大致是说SqlBulkCopy提供了可以在同一服务器下或多个服务器之间进行传递数据的工作,尽管也有其他方法能实现这个功能,但它明显要更高效.

    这个方法仅只能向SqlServer中的表写数据,它能通过DataTable实现,或者IDataReader实现.

    以下实例仅供记录,提供思路作用,并不保证测试通过..

实例1.

   DataTable例子

  
    

   
     
   
     public
   
      
   
     void
   
      ExecuteInsert(
   
     string
   
      destinationTableName, DataTable sourcedt)
 {
 Open();
 
   
     using
   
      (SqlBulkCopy sbc 
   
     =
   
      
   
     new
   
      SqlBulkCopy(con))
 {
 
   
     //
   
     服务器上目标表的名称
   
     

   
      sbc.DestinationTableName 
   
     =
   
      destinationTableName;
 
   
     for
   
      (
   
     int
   
      i 
   
     =
   
      
   
     0
   
     ; i 
   
     <
   
      sourcedt.Columns.Count; i
   
     ++
   
     )
 {
 
   
     //
   
     列映射定义数据源中的列和目标表中的列之间的关系
   
     

   
      sbc.ColumnMappings.Add(sourcedt.Columns[i].ColumnName,
   
     "
   
     destinationName
   
     "
   
     );
 }
 sbc.WriteToServer(sourcedt);
 }
 }
  
    

实例2 DataReader

  

代码

   
     

    
      
    
      using
    
       System.Data.SqlClient;


    
      class
    
       Program
{
 
    
      static
    
       
    
      void
    
       Main()
 {
 
    
      string
    
       connectionString 
    
      =
    
       GetConnectionString();
 
    
      //
    
       Open a sourceConnection to the AdventureWorks database.
    
      

    
       
    
      using
    
       (SqlConnection sourceConnection 
    
      =
    
      
 
    
      new
    
       SqlConnection(connectionString))
 {
 sourceConnection.Open();

 
    
      //
    
       Perform an initial count on the destination table.
    
      

    
       SqlCommand commandRowCount 
    
      =
    
       
    
      new
    
       SqlCommand(
 
    
      "
    
      SELECT COUNT(*) FROM 
    
      "
    
       
    
      +
    
      
 
    
      "
    
      dbo.BulkCopyDemoMatchingColumns;
    
      "
    
      ,
 sourceConnection);
 
    
      long
    
       countStart 
    
      =
    
       System.Convert.ToInt32(
 commandRowCount.ExecuteScalar());
 Console.WriteLine(
    
      "
    
      Starting row count = {0}
    
      "
    
      , countStart);

 
    
      //
    
       Get data from the source table as a SqlDataReader.
    
      

    
       SqlCommand commandSourceData 
    
      =
    
       
    
      new
    
       SqlCommand(
 
    
      "
    
      SELECT ProductID, Name, 
    
      "
    
       
    
      +
    
      
 
    
      "
    
      ProductNumber 
    
      "
    
       
    
      +
    
      
 
    
      "
    
      FROM Production.Product;
    
      "
    
      , sourceConnection);
 SqlDataReader reader 
    
      =
    
      
 commandSourceData.ExecuteReader();

 
    
      //
    
       Open the destination connection. In the real world you would 
 
    
      //
    
       not use SqlBulkCopy to move data from one table to the other 
 
    
      //
    
       in the same database. This is for demonstration purposes only.
    
      

    
       
    
      using
    
       (SqlConnection destinationConnection 
    
      =
    
      
 
    
      new
    
       SqlConnection(connectionString))
 {
 destinationConnection.Open();

 
    
      //
    
       Set up the bulk copy object. 
 
    
      //
    
       Note that the column positions in the source
 
    
      //
    
       data reader match the column positions in 
 
    
      //
    
       the destination table so there is no need to
 
    
      //
    
       map columns.
    
      

    
       
    
      using
    
       (SqlBulkCopy bulkCopy 
    
      =
    
      
 
    
      new
    
       SqlBulkCopy(destinationConnection))
 {
 bulkCopy.DestinationTableName 
    
      =
    
      
 
    
      "
    
      dbo.BulkCopyDemoMatchingColumns
    
      "
    
      ;

 
    
      try
    
      
 {
 
    
      //
    
       Write from the source to the destination.
    
      

    
       bulkCopy.WriteToServer(reader);
 }
 
    
      catch
    
       (Exception ex)
 {
 Console.WriteLine(ex.Message);
 }
 
    
      finally
    
      
 {
 
    
      //
    
       Close the SqlDataReader. The SqlBulkCopy
 
    
      //
    
       object is automatically closed at the end
 
    
      //
    
       of the using block.
    
      

    
       reader.Close();
 }
 }

 
    
      //
    
       Perform a final count on the destination 
 
    
      //
    
       table to see how many rows were added.
    
      

    
       
    
      long
    
       countEnd 
    
      =
    
       System.Convert.ToInt32(
 commandRowCount.ExecuteScalar());
 Console.WriteLine(
    
      "
    
      Ending row count = {0}
    
      "
    
      , countEnd);
 Console.WriteLine(
    
      "
    
      {0} rows were added.
    
      "
    
      , countEnd 
    
      -
    
       countStart);
 Console.WriteLine(
    
      "
    
      Press Enter to finish.
    
      "
    
      );
 Console.ReadLine();
 }
 }
 }

 
    
      private
    
       
    
      static
    
       
    
      string
    
       GetConnectionString()
 
    
      //
    
       To avoid storing the sourceConnection string in your code, 
 
    
      //
    
       you can retrieve it from a configuration file. 
    
      

    
       {
 
    
      return
    
       
    
      "
    
      Data Source=(local); 
    
      "
    
       
    
      +
    
      
 
    
      "
    
       Integrated Security=true;
    
      "
    
       
    
      +
    
      
 
    
      "
    
      Initial Catalog=AdventureWorks;
    
      "
    
      ;
 }
}