单次批量复制操作

最新推荐文章于 2023-07-05 11:45:17 发布

ilove3

最新推荐文章于 2023-07-05 11:45:17 发布

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分类专栏：数据库文章标签： table string exception security 服务器 object

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本文介绍如何使用SqlBulkCopy对象在SQL Server中进行批量复制数据。文章通过示例代码详细展示了从打开连接到关闭连接的整个过程，包括读取源数据、设置目标表名及执行复制操作等关键步骤。

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注：此文从msdn抄过来的。

执行批量复制操作的一般步骤如下所示：

连接到源服务器上并获取要复制的数据。如果可以从 IDataReader 或 DataTable 对象检索数据，则这些数据还可能来自其他源。
连接到目标服务器（除非您希望 SqlBulkCopy 为您建立连接）。
创建一个 SqlBulkCopy 对象，设置任何必要的属性。
设置 DestinationTableName 属性以指示执行批量插入操作的目标表。
调用一个 WriteToServer 方法。
可以选择更新属性并根据需要再次调用 WriteToServer。
调用 Close，或将批量复制操作包装在 Using 语句。

代码如下：

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;";
    }
}