SqlBulkCopyColumnMapping 构造函数
定义
初始化 SqlBulkCopyColumnMapping 类的新实例。Initializes a new instance of the SqlBulkCopyColumnMapping class.
重载
| SqlBulkCopyColumnMapping() |
用于初始化新的 SqlBulkCopyColumnMapping 对象的无参数构造函数。Parameterless constructor that initializes a new SqlBulkCopyColumnMapping object. |
| SqlBulkCopyColumnMapping(Int32, Int32) |
创建新的列映射,并使用列序号引用源列和目标列。Creates a new column mapping, using column ordinals to refer to source and destination columns. |
| SqlBulkCopyColumnMapping(Int32, String) |
创建新的列映射,并使用列序号引用源列和目标列的列名称。Creates a new column mapping, using a column ordinal to refer to the source column and a column name for the target column. |
| SqlBulkCopyColumnMapping(String, Int32) |
创建新的列映射,并使用列名称引用源列和目标列的列序号。Creates a new column mapping, using a column name to refer to the source column and a column ordinal for the target column. |
| SqlBulkCopyColumnMapping(String, String) |
创建新的列映射,并使用列名称引用源列和目标列。Creates a new column mapping, using column names to refer to source and destination columns. |
SqlBulkCopyColumnMapping()
用于初始化新的 SqlBulkCopyColumnMapping 对象的无参数构造函数。Parameterless constructor that initializes a new SqlBulkCopyColumnMapping object.
public:
SqlBulkCopyColumnMapping();
public SqlBulkCopyColumnMapping ();
Public Sub New ()
示例
下面的示例将数据从AdventureWorks示例数据库中的源表大容量复制到同一个数据库中的目标表。The following example bulk copies data from a source table in the AdventureWorks sample database to a destination table in the same database. 尽管目标中的列数与源中的列数匹配,但列名称和序号位置不匹配。Although the number of columns in the destination matches the number of columns in the source, the column names and ordinal positions do not match. SqlBulkCopyColumnMapping对象用于为大容量复制创建列映射。SqlBulkCopyColumnMapping objects are used to create a column map for the bulk copy.
重要
除非已按照大容量复制示例设置中所述创建了工作表,否则此示例将不会运行。This sample will not run unless you have created the work tables as described in Bulk Copy Example Setup. 提供此代码是为了演示仅使用 SqlBulkCopy 时的语法。This code is provided to demonstrate the syntax for using SqlBulkCopy only. 如果源表和目标表位于同一个 SQL Server 实例中,则使用 Transact-sql 语句复制数据会更加简单快捷 INSERT … SELECT 。If the source and destination tables are in the same SQL Server instance, it is easier and faster to use a Transact-SQL INSERT … SELECT statement to copy the data.
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.BulkCopyDemoDifferentColumns;",
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();
// Set up the bulk copy object.
using (SqlBulkCopy bulkCopy =
new SqlBulkCopy(connectionString))
{
bulkCopy.DestinationTableName =
"dbo.BulkCopyDemoDifferentColumns";
// Set up the column mappings by name.
SqlBulkCopyColumnMapping mapID =
new SqlBulkCopyColumnMapping("ProductID", "ProdID");
bulkCopy.ColumnMappings.Add(mapID);
SqlBulkCopyColumnMapping mapName =
new SqlBulkCopyColumnMapping("Name", "ProdName");
bulkCopy.ColumnMappings.Add(mapName);
SqlBulkCopyColumnMapping mapMumber =
new SqlBulkCopyColumnMapping("ProductNumber", "ProdNum");
bulkCopy.ColumnMappings.Add(mapMumber);
// Write from the source to the destination.
try
{
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.BulkCopyDemoDifferentColumns;", _
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 SqlCommand = New SqlCommand( _
"SELECT ProductID, Name, ProductNumber " & _
"FROM Production.Product;", sourceConnection)
Dim reader As SqlDataReader = commandSourceData.ExecuteReader
' Set up the bulk copy object.
Using bulkCopy As SqlBulkCopy = New SqlBulkCopy(connectionString)
bulkCopy.DestinationTableName = _
"dbo.BulkCopyDemoDifferentColumns"
' Set up the column mappings by name.
Dim mapID As New _
SqlBulkCopyColumnMapping("ProductID", "ProdID")
bulkCopy.ColumnMappings.Add(mapID)
Dim mapName As New _
SqlBulkCopyColumnMapping("Name", "ProdName")
bulkCopy.ColumnMappings.Add(mapName)
Dim mapMumber As New _
SqlBulkCopyColumnMapping("ProductNumber", "ProdNum")
bulkCopy.ColumnMappings.Add(mapMumber)
' Write from the source to the destination.
Try
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 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
如果使用此构造函数,则必须使用属性或属性为映射定义源 SourceColumn SourceOrdinal ,并使用 DestinationColumn 属性或属性定义映射的目标 DestinationOrdinal 。If you use this constructor, you must then define the source for the mapping using the SourceColumn property or the SourceOrdinal property, and define the destination for the mapping using the DestinationColumn property or the DestinationOrdinal property.
适用于
SqlBulkCopyColumnMapping(Int32, Int32)
创建新的列映射,并使用列序号引用源列和目标列。Creates a new column mapping, using column ordinals to refer to source and destination columns.
public:
SqlBulkCopyColumnMapping(int sourceColumnOrdinal, int destinationOrdinal);
public SqlBulkCopyColumnMapping (int sourceColumnOrdinal, int destinationOrdinal);
new System.Data.SqlClient.SqlBulkCopyColumnMapping : int * int -> System.Data.SqlClient.SqlBulkCopyColumnMapping
Public Sub New (sourceColumnOrdinal As Integer, destinationOrdinal As Integer)
参数
- sourceColumnOrdinal
- Int32
数据源中源列的序号位置。The ordinal position of the source column within the data source.
- destinationOrdinal
- Int32
目标表中目标列的序号位置。The ordinal position of the destination column within the destination table.
示例
下面的示例将数据从AdventureWorks示例数据库中的源表大容量复制到同一个数据库中的目标表。The following example bulk copies data from a source table in the AdventureWorks sample database to a destination table in the same database. 尽管目标中的列数与源中的列数匹配,但列名称和序号位置不匹配。Although the number of columns in the destination matches the number of columns in the source, the column names and ordinal positions do not match. SqlBulkCopyColumnMapping对象用于基于列的序号位置为大容量复制创建列映射。SqlBulkCopyColumnMapping objects are used to create a column map for the bulk copy based on the ordinal positions of the columns.
重要
除非已按照大容量复制示例设置中所述创建了工作表,否则此示例将不会运行。This sample will not run unless you have created the work tables as described in Bulk Copy Example Setup. 提供此代码是为了演示仅使用 SqlBulkCopy 时的语法。This code is provided to demonstrate the syntax for using SqlBulkCopy only. 如果源表和目标表位于同一个 SQL Server 实例中,则使用 Transact-sql 语句复制数据会更加简单快捷 INSERT … SELECT 。If the source and destination tables are in the same SQL Server instance, it is easier and faster to use a Transact-SQL INSERT … SELECT statement to copy the data.
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.BulkCopyDemoDifferentColumns;",
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();
// Set up the bulk copy object.
using (SqlBulkCopy bulkCopy =
new SqlBulkCopy(connectionString))
{
bulkCopy.DestinationTableName =
"dbo.BulkCopyDemoDifferentColumns";
// Set up the column mappings by ordinal.
SqlBulkCopyColumnMapping columnMapID =
new SqlBulkCopyColumnMapping(0, 0);
bulkCopy.ColumnMappings.Add(columnMapID);
SqlBulkCopyColumnMapping columnMapName =
new SqlBulkCopyColumnMapping(1, 2);
bulkCopy.ColumnMappings.Add(columnMapName);
SqlBulkCopyColumnMapping columnMapNumber =
new SqlBulkCopyColumnMapping(2, 1);
bulkCopy.ColumnMappings.Add(columnMapNumber);
// Write from the source to the destination.
try
{
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.BulkCopyDemoDifferentColumns;", _
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 SqlCommand = New SqlCommand( _
"SELECT ProductID, Name, ProductNumber " & _
"FROM Production.Product;", sourceConnection)
Dim reader As SqlDataReader = commandSourceData.ExecuteReader
' Set up the bulk copy object.
Using bulkCopy As SqlBulkCopy = New SqlBulkCopy(connectionString)
bulkCopy.DestinationTableName = _
"dbo.BulkCopyDemoDifferentColumns"
' Set up the column mappings by ordinal.
Dim columnMapID As New _
SqlBulkCopyColumnMapping(0, 0)
bulkCopy.ColumnMappings.Add(columnMapID)
Dim columnMapName As New _
SqlBulkCopyColumnMapping(1, 2)
bulkCopy.ColumnMappings.Add(columnMapName)
Dim columnMapNumber As New _
SqlBulkCopyColumnMapping(2, 1)
bulkCopy.ColumnMappings.Add(columnMapNumber)
' Write from the source to the destination.
Try
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 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
适用于
SqlBulkCopyColumnMapping(Int32, String)
创建新的列映射,并使用列序号引用源列和目标列的列名称。Creates a new column mapping, using a column ordinal to refer to the source column and a column name for the target column.
public:
SqlBulkCopyColumnMapping(int sourceColumnOrdinal, System::String ^ destinationColumn);
public SqlBulkCopyColumnMapping (int sourceColumnOrdinal, string destinationColumn);
new System.Data.SqlClient.SqlBulkCopyColumnMapping : int * string -> System.Data.SqlClient.SqlBulkCopyColumnMapping
Public Sub New (sourceColumnOrdinal As Integer, destinationColumn As String)
参数
- sourceColumnOrdinal
- Int32
数据源中源列的序号位置。The ordinal position of the source column within the data source.
- destinationColumn
- String
目标表中目标列的名称。The name of the destination column within the destination table.
示例
下面的示例将数据从AdventureWorks示例数据库中的源表大容量复制到同一个数据库中的目标表。The following example bulk copies data from a source table in the AdventureWorks sample database to a destination table in the same database. 尽管目标中的列数与源中的列数匹配,但列名称和序号位置不匹配。Although the number of columns in the destination matches the number of columns in the source, the column names and ordinal positions do not match. SqlBulkCopyColumnMapping对象用于为大容量复制创建列映射。SqlBulkCopyColumnMapping objects are used to create a column map for the bulk copy.
重要
除非已按照大容量复制示例设置中所述创建了工作表,否则此示例将不会运行。This sample will not run unless you have created the work tables as described in Bulk Copy Example Setup. 提供此代码是为了演示仅使用 SqlBulkCopy 时的语法。This code is provided to demonstrate the syntax for using SqlBulkCopy only. 如果源表和目标表位于同一个 SQL Server 实例中,则使用 Transact-sql 语句复制数据会更加简单快捷 INSERT … SELECT 。If the source and destination tables are in the same SQL Server instance, it is easier and faster to use a Transact-SQL INSERT … SELECT statement to copy the data.
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.BulkCopyDemoDifferentColumns;",
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();
// Set up the bulk copy object.
using (SqlBulkCopy bulkCopy =
new SqlBulkCopy(connectionString))
{
bulkCopy.DestinationTableName =
"dbo.BulkCopyDemoDifferentColumns";
// Set up the column mappings by ordinal and name.
SqlBulkCopyColumnMapping columnMapID =
new SqlBulkCopyColumnMapping(0, "ProdID");
bulkCopy.ColumnMappings.Add(columnMapID);
SqlBulkCopyColumnMapping columnMapName =
new SqlBulkCopyColumnMapping(1, "ProdName");
bulkCopy.ColumnMappings.Add(columnMapName);
SqlBulkCopyColumnMapping columnMapNumber =
new SqlBulkCopyColumnMapping(2, "ProdNum");
bulkCopy.ColumnMappings.Add(columnMapNumber);
// Write from the source to the destination.
try
{
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.BulkCopyDemoDifferentColumns;", _
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 SqlCommand = New SqlCommand( _
"SELECT ProductID, Name, ProductNumber " & _
"FROM Production.Product;", sourceConnection)
Dim reader As SqlDataReader = commandSourceData.ExecuteReader
' Set up the bulk copy object.
Using bulkCopy As SqlBulkCopy = New SqlBulkCopy(connectionString)
bulkCopy.DestinationTableName = _
"dbo.BulkCopyDemoDifferentColumns"
' Set up the column mappings by ordinal and name.
Dim columnMapID As New _
SqlBulkCopyColumnMapping(0, "ProdID")
bulkCopy.ColumnMappings.Add(columnMapID)
Dim columnMapName As New _
SqlBulkCopyColumnMapping(1, "ProdName")
bulkCopy.ColumnMappings.Add(columnMapName)
Dim columnMapNumber As New _
SqlBulkCopyColumnMapping(2, "ProdNum")
bulkCopy.ColumnMappings.Add(columnMapNumber)
' Write from the source to the destination.
Try
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 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
适用于
SqlBulkCopyColumnMapping(String, Int32)
创建新的列映射,并使用列名称引用源列和目标列的列序号。Creates a new column mapping, using a column name to refer to the source column and a column ordinal for the target column.
public:
SqlBulkCopyColumnMapping(System::String ^ sourceColumn, int destinationOrdinal);
public SqlBulkCopyColumnMapping (string sourceColumn, int destinationOrdinal);
new System.Data.SqlClient.SqlBulkCopyColumnMapping : string * int -> System.Data.SqlClient.SqlBulkCopyColumnMapping
Public Sub New (sourceColumn As String, destinationOrdinal As Integer)
参数
- sourceColumn
- String
数据源中源列的名称。The name of the source column within the data source.
- destinationOrdinal
- Int32
目标表中目标列的序号位置。The ordinal position of the destination column within the destination table.
示例
下面的示例将数据从AdventureWorks示例数据库中的源表大容量复制到同一个数据库中的目标表。The following example bulk copies data from a source table in the AdventureWorks sample database to a destination table in the same database. 尽管目标中的列数与源中的列数匹配,但列名称和序号位置不匹配。Although the number of columns in the destination matches the number of columns in the source, the column names and ordinal positions do not match. SqlBulkCopyColumnMapping对象用于为大容量复制创建列映射。SqlBulkCopyColumnMapping objects are used to create a column map for the bulk copy.
重要
除非已按照大容量复制示例设置中所述创建了工作表,否则此示例将不会运行。This sample will not run unless you have created the work tables as described in Bulk Copy Example Setup. 提供此代码是为了演示仅使用 SqlBulkCopy 时的语法。This code is provided to demonstrate the syntax for using SqlBulkCopy only. 如果源表和目标表位于同一个 SQL Server 实例中,则使用 Transact-sql 语句复制数据会更加简单快捷 INSERT … SELECT 。If the source and destination tables are in the same SQL Server instance, it is easier and faster to use a Transact-SQL INSERT … SELECT statement to copy the data.
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.BulkCopyDemoDifferentColumns;",
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();
// Set up the bulk copy object.
using (SqlBulkCopy bulkCopy =
new SqlBulkCopy(connectionString))
{
bulkCopy.DestinationTableName =
"dbo.BulkCopyDemoDifferentColumns";
// Set up the column mappings by name and ordinal.
SqlBulkCopyColumnMapping columnMapID =
new SqlBulkCopyColumnMapping("ProductID", 0);
bulkCopy.ColumnMappings.Add(columnMapID);
SqlBulkCopyColumnMapping columnMapName =
new SqlBulkCopyColumnMapping("Name", 2);
bulkCopy.ColumnMappings.Add(columnMapName);
SqlBulkCopyColumnMapping columnMapNumber =
new SqlBulkCopyColumnMapping("ProductNumber", 1);
bulkCopy.ColumnMappings.Add(columnMapNumber);
// Write from the source to the destination.
try
{
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.BulkCopyDemoDifferentColumns;", _
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 SqlCommand = New SqlCommand( _
"SELECT ProductID, Name, ProductNumber " & _
"FROM Production.Product;", sourceConnection)
Dim reader As SqlDataReader = commandSourceData.ExecuteReader
' Set up the bulk copy object.
Using bulkCopy As SqlBulkCopy = New SqlBulkCopy(connectionString)
bulkCopy.DestinationTableName = _
"dbo.BulkCopyDemoDifferentColumns"
' Set up the column mappings by name and ordinal.
Dim columnMapID As New _
SqlBulkCopyColumnMapping("ProductID", 0)
bulkCopy.ColumnMappings.Add(columnMapID)
Dim columnMapName As New _
SqlBulkCopyColumnMapping("Name", 2)
bulkCopy.ColumnMappings.Add(columnMapName)
Dim columnMapNumber As New _
SqlBulkCopyColumnMapping("ProductNumber", 1)
bulkCopy.ColumnMappings.Add(columnMapNumber)
' Write from the source to the destination.
Try
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 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
适用于
SqlBulkCopyColumnMapping(String, String)
创建新的列映射,并使用列名称引用源列和目标列。Creates a new column mapping, using column names to refer to source and destination columns.
public:
SqlBulkCopyColumnMapping(System::String ^ sourceColumn, System::String ^ destinationColumn);
public SqlBulkCopyColumnMapping (string sourceColumn, string destinationColumn);
new System.Data.SqlClient.SqlBulkCopyColumnMapping : string * string -> System.Data.SqlClient.SqlBulkCopyColumnMapping
Public Sub New (sourceColumn As String, destinationColumn As String)
参数
- sourceColumn
- String
数据源中源列的名称。The name of the source column within the data source.
- destinationColumn
- String
目标表中目标列的名称。The name of the destination column within the destination table.
示例
下面的示例将数据从AdventureWorks示例数据库中的源表大容量复制到同一个数据库中的目标表。The following example bulk copies data from a source table in the AdventureWorks sample database to a destination table in the same database. 尽管目标中的列数与源中的列数匹配,但列名称和序号位置不匹配。Although the number of columns in the destination matches the number of columns in the source, the column names and ordinal positions do not match. SqlBulkCopyColumnMapping对象用于为大容量复制创建列映射。SqlBulkCopyColumnMapping objects are used to create a column map for the bulk copy.
重要
除非已按照大容量复制示例设置中所述创建了工作表,否则此示例将不会运行。This sample will not run unless you have created the work tables as described in Bulk Copy Example Setup. 提供此代码是为了演示仅使用 SqlBulkCopy 时的语法。This code is provided to demonstrate the syntax for using SqlBulkCopy only. 如果源表和目标表位于同一个 SQL Server 实例中,则使用 Transact-sql 语句复制数据会更加简单快捷 INSERT … SELECT 。If the source and destination tables are in the same SQL Server instance, it is easier and faster to use a Transact-SQL INSERT … SELECT statement to copy the data.
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.BulkCopyDemoDifferentColumns;",
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();
// Set up the bulk copy object.
using (SqlBulkCopy bulkCopy =
new SqlBulkCopy(connectionString))
{
bulkCopy.DestinationTableName =
"dbo.BulkCopyDemoDifferentColumns";
// Set up the column mappings by name.
SqlBulkCopyColumnMapping mapID =
new SqlBulkCopyColumnMapping("ProductID", "ProdID");
bulkCopy.ColumnMappings.Add(mapID);
SqlBulkCopyColumnMapping mapName =
new SqlBulkCopyColumnMapping("Name", "ProdName");
bulkCopy.ColumnMappings.Add(mapName);
SqlBulkCopyColumnMapping mapMumber =
new SqlBulkCopyColumnMapping("ProductNumber", "ProdNum");
bulkCopy.ColumnMappings.Add(mapMumber);
// Write from the source to the destination.
try
{
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.BulkCopyDemoDifferentColumns;", _
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 SqlCommand = New SqlCommand( _
"SELECT ProductID, Name, ProductNumber " & _
"FROM Production.Product;", sourceConnection)
Dim reader As SqlDataReader = commandSourceData.ExecuteReader
' Set up the bulk copy object.
Using bulkCopy As SqlBulkCopy = New SqlBulkCopy(connectionString)
bulkCopy.DestinationTableName = _
"dbo.BulkCopyDemoDifferentColumns"
' Set up the column mappings by name.
Dim mapID As New _
SqlBulkCopyColumnMapping("ProductID", "ProdID")
bulkCopy.ColumnMappings.Add(mapID)
Dim mapName As New _
SqlBulkCopyColumnMapping("Name", "ProdName")
bulkCopy.ColumnMappings.Add(mapName)
Dim mapMumber As New _
SqlBulkCopyColumnMapping("ProductNumber", "ProdNum")
bulkCopy.ColumnMappings.Add(mapMumber)
' Write from the source to the destination.
Try
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 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