protected static Guid GetGuid <T>(SqlBase source_con, object id)
{
Guid result = Guid.NewGuid();
var map = source_con.GetMapping <T>();
string text = source_con.Single <string>($"SELECT SyncGuid FROM {map.TableName} where {map.PK.Name}='{id}'");
if (!string.IsNullOrEmpty(text))
{
Guid.TryParse(text, out result);
}
return(result);
}