public static void Merge <T>(DbContext context, IList <T> entities, TableInfo tableInfo, OperationType operationType, Action <decimal> progress) where T : class
        {
            tableInfo.InsertToTempTable = true;
            tableInfo.CheckHasIdentity(context);

            context.Database.CommandTimeout = 960;

            context.Database.ExecuteSqlCommand(SqlQueryBuilder.CreateTableCopy(tableInfo.FullTableName, tableInfo.FullTempTableName));

            if (tableInfo.BulkConfig.SetOutputIdentity)
            {
                context.Database.ExecuteSqlCommand(SqlQueryBuilder.CreateTableCopy(tableInfo.FullTableName, tableInfo.FullTempOutputTableName));
            }
            try
            {
                Insert(context, entities, tableInfo, progress);
                context.Database.ExecuteSqlCommand(SqlQueryBuilder.MergeTable(tableInfo, operationType));
                context.Database.ExecuteSqlCommand(SqlQueryBuilder.DropTable(tableInfo.FullTempTableName));

                if (!tableInfo.BulkConfig.SetOutputIdentity || !tableInfo.HasSinglePrimaryKey)
                {
                    return;
                }
                try
                {
                    tableInfo.UpdateOutputIdentity(context, entities);
                    var dp = SqlQueryBuilder.DropTable(tableInfo.FullTempOutputTableName);
                    context.Database.ExecuteSqlCommand(dp);
                }
                catch (Exception)
                {
                    context.Database.ExecuteSqlCommand(SqlQueryBuilder.DropTable(tableInfo.FullTempOutputTableName));
                    throw;
                }
            }
            catch (Exception)
            {
                context.Database.ExecuteSqlCommand(SqlQueryBuilder.DropTable(tableInfo.FullTempTableName));
                throw;
            }
        }