private async Task BulkInsertAsync <T>(
IEntityType entityType,
IEnumerable <T> entities,
string?schema,
string tableName,
IBulkInsertOptions options,
CancellationToken cancellationToken = default)
where T : class
{
if (entities == null)
{
throw new ArgumentNullException(nameof(entities));
}
if (tableName == null)
{
throw new ArgumentNullException(nameof(tableName));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
if (!(options is SqlServerBulkInsertOptions sqlServerOptions))
{
sqlServerOptions = new SqlServerBulkInsertOptions(options);
}
var factory = _ctx.GetService <IEntityDataReaderFactory>();
var properties = options.MembersToInsert.GetPropertiesForInsert(entityType);
var sqlCon = (SqlConnection)_ctx.Database.GetDbConnection();
var sqlTx = (SqlTransaction?)_ctx.Database.CurrentTransaction?.GetDbTransaction();
using var reader = factory.Create(_ctx, entities, properties);
using var bulkCopy = CreateSqlBulkCopy(sqlCon, sqlTx, schema, tableName, sqlServerOptions);
var columns = SetColumnMappings(bulkCopy, reader);
await _ctx.Database.OpenConnectionAsync(cancellationToken).ConfigureAwait(false);
try
{
LogInserting(sqlServerOptions.SqlBulkCopyOptions, bulkCopy, columns);
var stopwatch = Stopwatch.StartNew();
await bulkCopy.WriteToServerAsync(reader, cancellationToken).ConfigureAwait(false);
LogInserted(sqlServerOptions.SqlBulkCopyOptions, stopwatch.Elapsed, bulkCopy, columns);
}
finally
{
await _ctx.Database.CloseConnectionAsync().ConfigureAwait(false);
}
}
private SqlBulkCopy CreateSqlBulkCopy(SqlConnection sqlCon, SqlTransaction?sqlTx, string?schema, string tableName, SqlServerBulkInsertOptions sqlServerOptions)
{
var bulkCopy = new SqlBulkCopy(sqlCon, sqlServerOptions.SqlBulkCopyOptions, sqlTx)
{
DestinationTableName = _sqlGenerationHelper.DelimitIdentifier(tableName, schema),
EnableStreaming = sqlServerOptions.EnableStreaming
};
if (sqlServerOptions.BulkCopyTimeout.HasValue)
{
bulkCopy.BulkCopyTimeout = (int)sqlServerOptions.BulkCopyTimeout.Value.TotalSeconds;
}
if (sqlServerOptions.BatchSize.HasValue)
{
bulkCopy.BatchSize = sqlServerOptions.BatchSize.Value;
}
return(bulkCopy);
}