protected virtual void UpdateLinkDatabase(BulkLoadContext loadContext, BulkLoadSqlContext sqlContext,
LinkedList <BulkItemLink> links, ICollection <ItemChange> changes)
{
// Index all items that were actually changed in db.
var touchedItemsMap = changes
.GroupBy(x => x.ItemId)
.ToDictionary(x => x.First().OriginalItemId, x => x.First().ItemId);
// Get links and filter and map them by touched items.
if (links.Count == 0)
{
return;
}
var linksForTouchedItems = links
.Where(x => touchedItemsMap.ContainsKey(x.SourceItemID.Guid))
.Select(x => x.Map(x.SourceItemID.Guid, touchedItemsMap[x.SourceItemID.Guid]));
// Create temp table, bulk load temp table, merge records in link database.
// The link database is probably not the same physical db as the one were loading data to.
var createLinkTempTable = sqlContext.GetEmbeddedSql(loadContext, "Sql.20.CreateLinkTempTable.sql");
var mergeLinkData = sqlContext.GetEmbeddedSql(loadContext, "Sql.21.MergeLinkTempData.sql");
var connectionString = ((SqlServerLinkDatabase)Factory.GetLinkDatabase()).ConnectionString;
using (var conn = new SqlConnection(connectionString))
{
conn.Open();
var linkSqlContext = new SqlContext(conn);
linkSqlContext.ExecuteSql(createLinkTempTable);
using (var bulkCopy = new SqlBulkCopy(conn))
{
bulkCopy.BulkCopyTimeout = int.MaxValue;
bulkCopy.EnableStreaming = true;
bulkCopy.DestinationTableName = sqlContext.PostProcessSql(loadContext, "#ItemLinks");
try
{
bulkCopy.WriteToServer(new ItemLinksReader(() => linksForTouchedItems.GetEnumerator()));
}
catch (Exception exception)
{
loadContext.StageFailed(Stage.Load, exception,
$"Write to #ItemLinks failed with message: {exception.Message}");
return;
}
}
linkSqlContext.ExecuteSql(mergeLinkData);
}
}
