protected override IEnumerable <Command> OnDrop(IMetadata sourceMetadata, IMetadata targetMetadata, IComparerContext context)
 {
     yield return(new Command()
                  .Append($"DROP EXCEPTION {ExceptionName.AsSqlIndentifier()}"));
 }
 protected override IEnumerable <Command> OnCreate(IMetadata sourceMetadata, IMetadata targetMetadata, IComparerContext context)
 {
     yield return(new Command()
                  .Append($"CREATE OR ALTER EXCEPTION {ExceptionName.AsSqlIndentifier()} '{SqlHelper.DoubleSingleQuotes(Message)}'"));
 }