Question

我希望从C＃应用程序高效地执行DataTable到SQLServer的批量插入，并以正确的顺序检索插入的ID。为了使插入的主键自动递增值，我在同一连接上使用以下方法：

创建表#StagingTable（....）“
将DataTable批量插入#StagingTable

执行读者：

insert into DestinationTable(....<columns_list>...)
output inserted.ID -- primary key which is auto increment
select <columns_list> from #StagingTable

然后在C＃中我读取列表中的所有生成的ID。读取顺序未正确映射到DataTable.Rows顺序。

我的问题是：如果我在不做任何映射的情况下对这个id列表进行排序（即c＃simple：list.Sort()） - 这是正确的插入顺序，以便table.Rows[k]对应id = list[k]吗？

谢谢！

/编辑：

为了给你完整的上下文，我在C＃

using System.Data;
using System.Data.SqlClient;
using System.Web.UI.WebControls;

public static class SQLWrite
{
    public static void BulkWrite(this DataTable table, string destinationTable, SqlConnection connection, int batchSize)
    {
        if (connection.State != ConnectionState.Open)
        {
            connection.Open();
        }
        string columnNamesAndSQLType = string.Join(", ", Enumerable.Range(0, table.Columns.Count).
            Where(i => !table.Columns[i].AutoIncrement).
            Select(i => "[" + table.Columns[i].ColumnName + "] " +
                Parameter.ConvertTypeCodeToDbType(Type.GetTypeCode(table.Columns[i].DataType)).ToString()));
        string columnNames = string.Join(", ", Enumerable.Range(0, table.Columns.Count).
            Where(i => !table.Columns[i].AutoIncrement).
            Select(i => "[" + table.Columns[i].ColumnName + "]"));
        using (var command = connection.CreateCommand())
        {
            command.CommandText = @"
CREATE  TABLE #StagingTable(
    RowNumber INT IDENTITY(1, 1) NOT NULL, 
    " + columnNamesAndSQLType + @")     ";
            command.ExecuteNonQuery();
        }
        DataColumn autoIncrementColumn = null;
        using (var copy = new SqlBulkCopy(connection))
        {
            copy.BatchSize = batchSize;
            copy.DestinationTableName = destinationTable;
            foreach (DataColumn column in table.Columns)
            {
                if (column.AutoIncrement)
                {
                    autoIncrementColumn = column;
                    continue;
                }
                copy.ColumnMappings.Add(new SqlBulkCopyColumnMapping(column.ColumnName, column.ColumnName));
            }
            copy.WriteToServer(table);
        }
        using (var command = connection.CreateCommand())
        {
            command.CommandText = @"
INSERT  INTO dbo.DestinationTable(" + columnNames + @")
OUTPUT  INSERTED.ID 
SELECT  " + columnNames + @"
FROM    #StagingTable 
ORDER   BY RowNumber    
";   //Will the inserted ID values be retrieved in the natural order of insertion - by RowNumber ?
            using (var reader = command.ExecuteReader())
            {
                List<long> list = new List<long>();
                while (reader.Read())
                {
                    list.Add(reader.GetInt64(0));
                }
                list.Sort();
                int rowIndex = 0;
                foreach (DataRow row in table.Rows)
                {
                    row[autoIncrementColumn] = list[rowIndex];
                    rowIndex++;
                }
            }
        }
        if (connection.State != ConnectionState.Closed)
        {
            connection.Close();
        }
    }
}

假设每个表都有一个名为ID的bigint主键自动增量列。我想知道上面的代码是否检索SQL生成的IDS并将它们与数据表正确关联。

批量插入生成的ids返回顺序

0 个答案: