SqlBulkCopy Constructor (String)
Initializes and opens a new instance of SqlConnection based on the supplied connectionString. The constructor uses the SqlConnection to initialize a new instance of the SqlBulkCopy class.
Assembly: System.Data (in System.Data.dll)
Parameters
- connectionString
-
Type:
System.String
The string defining the connection that will be opened for use by the SqlBulkCopy instance. If your connection string does not use Integrated Security = true, you can use SqlBulkCopy or SqlBulkCopy and SqlCredential to pass the user ID and password more securely than by specifying the user ID and password as text in the connection string.
The connection is automatically closed at the end of the bulk copy operation.
If connectionString is null, an ArgumentNullException is thrown. If connectionString is an empty string, an ArgumentException is thrown.
The following console application demonstrates how to bulk load data by using a connection specified as a string. The connection is automatically closed when the SqlBulkCopy instance is closed.
In this example, the source data is first read from a SQL Server table to a SqlDataReader instance. The source data does not have to be located on SQL Server; you can use any data source that can be read to an IDataReader or loaded to a DataTable.
Important |
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This sample will not run unless you have created the work tables as described in Bulk Copy Example Setup. This code is provided to demonstrate the syntax for using SqlBulkCopy only. 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. |
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 SqlCommand = New SqlCommand( _ "SELECT ProductID, Name, ProductNumber " & _ "FROM Production.Product;", sourceConnection) Dim reader As SqlDataReader = commandSourceData.ExecuteReader ' Set up the bulk copy object using a connection string. ' In the real world you would not use SqlBulkCopy to move ' data from one table to the other in the same database. Using bulkCopy As SqlBulkCopy = New SqlBulkCopy(connectionString) 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 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
Available since 2.0
