SqlBulkCopy 类
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
允许你使用其他源的数据有效地批量加载 SQL Server 表。
public ref class SqlBulkCopy sealed : IDisposablepublic sealed class SqlBulkCopy : IDisposabletype SqlBulkCopy = class
interface IDisposablePublic NotInheritable Class SqlBulkCopy
Implements IDisposable- 继承
-
SqlBulkCopy
- 实现
示例
下面的控制台应用程序演示了如何使用 SqlBulkCopy 类加载数据。 在此示例中，SqlDataReader 用于将数据从 SQL Server AdventureWorks 数据库的 Production.Product 表复制到相同数据库的一个类似的表中。
重要
除非已按批量复制示例设置中所述创建了工作表，否则此示例不会运行。 提供此代码是为了演示仅使用 SqlBulkCopy 时的语法。 如果源表和目标表位于同一SQL Server实例中，则使用 Transact-SQL INSERT ... SELECT 语句复制数据会更轻松、更快。
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;";
}
}
Imports System.Data.SqlClient
Module Module1
Sub Main()
Dim connectionString As String = GetConnectionString()
' Open a connection to the AdventureWorks database.
Using sourceConnection As SqlConnection = _
New SqlConnection(connectionString)
sourceConnection.Open()
' Perform an initial count on the destination table.
Dim commandRowCount As New SqlCommand( _
"SELECT COUNT(*) FROM dbo.BulkCopyDemoMatchingColumns;", _
sourceConnection)
Dim countStart As Long = _
System.Convert.ToInt32(commandRowCount.ExecuteScalar())
Console.WriteLine("Starting row count = {0}", countStart)
' Get data from the source table as a SqlDataReader.
Dim commandSourceData As New SqlCommand( _
"SELECT ProductID, Name, ProductNumber " & _
"FROM Production.Product;", sourceConnection)
Dim reader As SqlDataReader = 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 destinationConnection As SqlConnection = _
New SqlConnection(connectionString)
destinationConnection.Open()
' Set up the bulk copy object.
' 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 bulkCopy As SqlBulkCopy = _
New SqlBulkCopy(destinationConnection)
bulkCopy.DestinationTableName = _
"dbo.BulkCopyDemoMatchingColumns"
Try
' Write from the source to the destination.
bulkCopy.WriteToServer(reader)
Catch ex As Exception
Console.WriteLine(ex.Message)
Finally
' Close the SqlDataReader. The SqlBulkCopy
' object is automatically closed at the end
' of the Using block.
reader.Close()
End Try
End Using
' Perform a final count on the destination table
' to see how many rows were added.
Dim countEnd As Long = _
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()
End Using
End Using
End Sub
Private Function GetConnectionString() As String
' 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;"
End Function
End Module
注解
Microsoft SQL Server包含一个名为 bcp 的常用命令提示符实用工具，用于将数据从一个表移动到另一个表，无论是在单个服务器上还是在服务器之间。 类 SqlBulkCopy 允许你编写提供类似功能的托管代码解决方案。 还可通过其他方法将数据加载到 SQL Server 表（例如 INSERT 语句），但 SqlBulkCopy 可提供显著的性能优势。
SqlBulkCopy 类可用于只将数据写入 SQL Server 表。 但是，数据源不限于SQL Server;可以使用任何数据源，只要数据可以加载到DataTable实例或使用实例读取IDataReader。
SqlBulkCopy将类型的SqlDateTime列大容量加载DataTable到类型为 2008 SQL Server中添加的日期/时间类型的一个SQL Server列时将失败。
构造函数
| SqlBulkCopy(SqlConnection) |
使用 SqlConnection 的打开的指定实例初始化 SqlBulkCopy 类的新实例。 |
| SqlBulkCopy(SqlConnection, SqlBulkCopyOptions, SqlTransaction) |
使用提供的 SqlBulkCopy 的现有打开实例初始化 SqlConnection 类的新实例。
SqlBulkCopy 实例的行为取决于 |
| SqlBulkCopy(String) |
基于提供的 |
| SqlBulkCopy(String, SqlBulkCopyOptions) |
基于提供的 |
属性
| BatchSize |
每批中的行数。 在每批结束时，会将批中的行发送到服务器。 |
| BulkCopyTimeout |
超时之前操作完成所允许的秒数。 |
| ColumnMappings |
返回 SqlBulkCopyColumnMapping 项的集合。 列映射定义数据源中的列和目标中的列之间的关系。 |
| DestinationTableName |
服务器上的目标表的名称。 |
| EnableStreaming |
启用或禁用 SqlBulkCopy 对象，以流式传输 IDataReader 对象中的数据。 |
| NotifyAfter |
定义生成通知事件之前要处理的行数。 |
方法
事件
| SqlRowsCopied |
每当 NotifyAfter 属性指定的行数被处理后会发生。 |
显式接口实现
| IDisposable.Dispose() |
释放 SqlBulkCopy 类的当前实例所使用的所有资源。 |
