SqlBulkCopyColumnMapping Constructeurs
Définition
Important
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Initialise une nouvelle instance de la classe SqlBulkCopyColumnMapping.
Surcharges
| SqlBulkCopyColumnMapping() |
Constructeur sans paramètre qui initialise un nouvel objet SqlBulkCopyColumnMapping. |
| SqlBulkCopyColumnMapping(Int32, Int32) |
Crée un nouveau mappage de colonnes à l'aide de numéros de colonne pour faire référence aux colonnes source et de destination. |
| SqlBulkCopyColumnMapping(Int32, String) |
Crée un nouveau mappage de colonnes à l'aide d'un numéro de colonne pour faire référence à la colonne source et d'un nom de colonne pour la colonne cible. |
| SqlBulkCopyColumnMapping(String, Int32) |
Crée un nouveau mappage de colonnes à l'aide d'un nom de colonne pour faire référence à la colonne source et d'un numéro de colonne pour la colonne cible. |
| SqlBulkCopyColumnMapping(String, String) |
Crée un nouveau mappage de colonnes à l'aide de noms de colonnes pour faire référence aux colonnes source et de destination. |
SqlBulkCopyColumnMapping()
Constructeur sans paramètre qui initialise un nouvel objet SqlBulkCopyColumnMapping.
public:
SqlBulkCopyColumnMapping();public SqlBulkCopyColumnMapping ();Public Sub New ()Exemples
L’exemple suivant copie en bloc les données d’une table source de l’exemple de base de données AdventureWorks vers une table de destination située dans la même base de données. Bien que le nombre de colonnes dans la destination corresponde au nombre de colonnes dans la source, les noms de colonnes et les positions ordinales ne correspondent pas. SqlBulkCopyColumnMapping les objets sont utilisés pour créer un mappage de colonnes pour la copie en bloc.
Important
Cet exemple ne s’exécutera que si vous avez créé les tables de travail comme décrit dans Configuration de l’exemple de copie en bloc. Ce code est fourni uniquement pour illustrer la syntaxe de l’utilisation de SqlBulkCopy. Si les tables source et de destination se trouvent dans le même SQL Server instance, il est plus facile et plus rapide d’utiliser une instruction Transact-SQL INSERT … SELECT pour copier les données.
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
Remarques
Si vous utilisez ce constructeur, vous devez ensuite définir la source du mappage à l’aide de la SourceColumn propriété ou de la SourceOrdinal propriété, et définir la destination du mappage à l’aide de la DestinationColumn propriété ou de la DestinationOrdinal propriété.
Voir aussi
S’applique à
SqlBulkCopyColumnMapping(Int32, Int32)
Crée un nouveau mappage de colonnes à l'aide de numéros de colonne pour faire référence aux colonnes source et de destination.
public:
SqlBulkCopyColumnMapping(int sourceColumnOrdinal, int destinationOrdinal);public SqlBulkCopyColumnMapping (int sourceColumnOrdinal, int destinationOrdinal);new System.Data.SqlClient.SqlBulkCopyColumnMapping : int * int -> System.Data.SqlClient.SqlBulkCopyColumnMappingPublic Sub New (sourceColumnOrdinal As Integer, destinationOrdinal As Integer)Paramètres
- sourceColumnOrdinal
- Int32
Position ordinale de la colonne source dans la source de données.
- destinationOrdinal
- Int32
Position ordinale de la colonne de destination dans la table de destination.
Exemples
L’exemple suivant copie en bloc les données d’une table source de l’exemple de base de données AdventureWorks vers une table de destination située dans la même base de données. Bien que le nombre de colonnes dans la destination corresponde au nombre de colonnes dans la source, les noms de colonnes et les positions ordinales ne correspondent pas. SqlBulkCopyColumnMapping les objets sont utilisés pour créer un mappage de colonnes pour la copie en bloc en fonction des positions ordinales des colonnes.
Important
Cet exemple ne s’exécutera que si vous avez créé les tables de travail comme décrit dans Configuration de l’exemple de copie en bloc. Ce code est fourni uniquement pour illustrer la syntaxe de l’utilisation de SqlBulkCopy. Si les tables source et de destination se trouvent dans le même SQL Server instance, il est plus facile et plus rapide d’utiliser une instruction Transact-SQL INSERT … SELECT pour copier les données.
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
Voir aussi
S’applique à
SqlBulkCopyColumnMapping(Int32, String)
Crée un nouveau mappage de colonnes à l'aide d'un numéro de colonne pour faire référence à la colonne source et d'un nom de colonne pour la colonne cible.
public:
SqlBulkCopyColumnMapping(int sourceColumnOrdinal, System::String ^ destinationColumn);public SqlBulkCopyColumnMapping (int sourceColumnOrdinal, string destinationColumn);new System.Data.SqlClient.SqlBulkCopyColumnMapping : int * string -> System.Data.SqlClient.SqlBulkCopyColumnMappingPublic Sub New (sourceColumnOrdinal As Integer, destinationColumn As String)Paramètres
- sourceColumnOrdinal
- Int32
Position ordinale de la colonne source dans la source de données.
- destinationColumn
- String
Nom de la colonne de destination dans la table de destination.
Exemples
L’exemple suivant copie en bloc les données d’une table source de l’exemple de base de données AdventureWorks vers une table de destination située dans la même base de données. Bien que le nombre de colonnes dans la destination corresponde au nombre de colonnes dans la source, les noms de colonnes et les positions ordinales ne correspondent pas. SqlBulkCopyColumnMapping les objets sont utilisés pour créer un mappage de colonnes pour la copie en bloc.
Important
Cet exemple ne s’exécutera que si vous avez créé les tables de travail comme décrit dans Configuration de l’exemple de copie en bloc. Ce code est fourni uniquement pour illustrer la syntaxe de l’utilisation de SqlBulkCopy. Si les tables source et de destination se trouvent dans le même SQL Server instance, il est plus facile et plus rapide d’utiliser une instruction Transact-SQL INSERT … SELECT pour copier les données.
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
Voir aussi
S’applique à
SqlBulkCopyColumnMapping(String, Int32)
Crée un nouveau mappage de colonnes à l'aide d'un nom de colonne pour faire référence à la colonne source et d'un numéro de colonne pour la colonne cible.
public:
SqlBulkCopyColumnMapping(System::String ^ sourceColumn, int destinationOrdinal);public SqlBulkCopyColumnMapping (string sourceColumn, int destinationOrdinal);new System.Data.SqlClient.SqlBulkCopyColumnMapping : string * int -> System.Data.SqlClient.SqlBulkCopyColumnMappingPublic Sub New (sourceColumn As String, destinationOrdinal As Integer)Paramètres
- sourceColumn
- String
Nom de la colonne source dans la source de données.
- destinationOrdinal
- Int32
Position ordinale de la colonne de destination dans la table de destination.
Exemples
L’exemple suivant copie en bloc les données d’une table source de l’exemple de base de données AdventureWorks vers une table de destination située dans la même base de données. Bien que le nombre de colonnes dans la destination corresponde au nombre de colonnes dans la source, les noms de colonnes et les positions ordinales ne correspondent pas. SqlBulkCopyColumnMapping les objets sont utilisés pour créer un mappage de colonnes pour la copie en bloc.
Important
Cet exemple ne s’exécutera que si vous avez créé les tables de travail comme décrit dans Configuration de l’exemple de copie en bloc. Ce code est fourni uniquement pour illustrer la syntaxe de l’utilisation de SqlBulkCopy. Si les tables source et de destination se trouvent dans le même SQL Server instance, il est plus facile et plus rapide d’utiliser une instruction Transact-SQL INSERT … SELECT pour copier les données.
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
Voir aussi
S’applique à
SqlBulkCopyColumnMapping(String, String)
Crée un nouveau mappage de colonnes à l'aide de noms de colonnes pour faire référence aux colonnes source et de destination.
public:
SqlBulkCopyColumnMapping(System::String ^ sourceColumn, System::String ^ destinationColumn);public SqlBulkCopyColumnMapping (string sourceColumn, string destinationColumn);new System.Data.SqlClient.SqlBulkCopyColumnMapping : string * string -> System.Data.SqlClient.SqlBulkCopyColumnMappingPublic Sub New (sourceColumn As String, destinationColumn As String)Paramètres
- sourceColumn
- String
Nom de la colonne source dans la source de données.
- destinationColumn
- String
Nom de la colonne de destination dans la table de destination.
Exemples
L’exemple suivant copie en bloc les données d’une table source de l’exemple de base de données AdventureWorks vers une table de destination située dans la même base de données. Bien que le nombre de colonnes dans la destination corresponde au nombre de colonnes dans la source, les noms de colonnes et les positions ordinales ne correspondent pas. SqlBulkCopyColumnMapping les objets sont utilisés pour créer un mappage de colonnes pour la copie en bloc.
Important
Cet exemple ne s’exécutera que si vous avez créé les tables de travail comme décrit dans Configuration de l’exemple de copie en bloc. Ce code est fourni uniquement pour illustrer la syntaxe de l’utilisation de SqlBulkCopy. Si les tables source et de destination se trouvent dans le même SQL Server instance, il est plus facile et plus rapide d’utiliser une instruction Transact-SQL INSERT … SELECT pour copier les données.
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
Voir aussi
S’applique à
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