how to set up auto mapping in sqlbulkcopy

Question

In our project we use Linq2SQL, but now we need to have a possibility to quickly insert nearly 15k rows in database table, so i wrote an extension method:

public static void BulkInsertBigData(Table<Maintenance> maintenance, IEnumerable<Maintenance> maintenancesToInsert)
    {

            using (var copy = new SqlBulkCopy(maintenance.Context.Connection.ConnectionString, SqlBulkCopyOptions.KeepIdentity | SqlBulkCopyOptions.KeepNulls))
            {
                //copy.ColumnMappings.Add("Id", "Id");
                //copy.ColumnMappings.Add("FacilityId", "FacilityId");
                //copy.ColumnMappings.Add("ParentFacilityId", "ParentFacilityId");
                //copy.ColumnMappings.Add("StartTime", "StartTime");
                //copy.ColumnMappings.Add("EndTime", "EndTime");
                //copy.ColumnMappings.Add("ExpirationTime", "ExpirationTime");
                //copy.ColumnMappings.Add("DispatcherUserName", "DispatcherUserName");
                copy.DestinationTableName = "dbo.Maintenance";
                var data = maintenancesToInsert.ToDataTable();
                copy.WriteToServer(data);
            }

    }

Maintanance is auto-generated Linq2SQL class. This code works great when i uncomment ColumnMappings lines, but they doesn't fit, because if somebody will change dbml this code won't work(this code isn't agile :) ). ToDataTable() is a reflection-based method, which converts List of Maintenance to DataTable.

I'll be gratefull for any help

score 5 · Accepted Answer · answered Nov 18 '13 at 10:29

How about:

public static void BulkInsertBigData<T>(Table<T> definition, IEnumerable<T> rows)
{
    using (var copy = new SqlBulkCopy(definition.Context.Connection.ConnectionString, SqlBulkCopyOptions.KeepIdentity | SqlBulkCopyOptions.KeepNulls))
    {
        var meta = definition.Context.Mapping.GetMetaType(typeof(T));
        foreach (var col in meta.DataMembers)
        {
            copy.ColumnMappings.Add(col.Member.Name, col.MappedName);
        }
        copy.DestinationTableName = meta.Table.TableName;
        var data = rows.ToDataTable();
        copy.WriteToServer(data);
    }
}

or even better: do away with DataTable via FastMember:

public static void BulkInsertBigData<T>(Table<T> definition, IEnumerable<T> rows)
{
    using (var copy = new SqlBulkCopy(definition.Context.Connection.ConnectionString, SqlBulkCopyOptions.KeepIdentity | SqlBulkCopyOptions.KeepNulls))
    {
        var meta = definition.Context.Mapping.GetMetaType(typeof(T));
        var members = new List<string>(meta.DataMembers.Count);
        foreach (var col in meta.DataMembers)
        {
            copy.ColumnMappings.Add(col.Member.Name, col.MappedName);
            members.Add(col.Member.Name);
        }
        copy.DestinationTableName = meta.Table.TableName;
        using (var reader = ObjectReader.Create(rows, members.ToArray()))
        {
            copy.WriteToServer(reader);
        }
    }
}

how to set up auto mapping in sqlbulkcopy

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