本文实例讲述了C#使用SqlBulkCopy批量复制数据到数据表的方法。分享给大家供大家参考。具体实现方法如下:
使用 SqlBulkCopy 类只能向 SQL Server 表写入数据。但是,数据源不限于 SQL Server;可以使用任何数据源,只要数据可加载到 DataTable 实例或可使用 IDataReader 实例读取数据
1.使用Datatable作为数据源的方式:
下面的代码使用到了ColumnMappings,因为目标表和数据源Datatable的结构不一致,需要这么一个映射来指定对应关系
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;\";
}
}
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