how to find if incomming parameter in not null and not empty in Sybase

问题

I am trying to write some thing like this in sybase ASE

@searchstring varchar(500)
    If(IsNULLorEmpty(@searchstring))
    {

    exec(@strexecsql)

    }
    else
    {

    exec(@strexecsql1)

    }

what is best way to check this condition IsNULLorEmpty for a incoming @parameter?

回答1:

The best would be ISNULL, i.e.:

DECLARE @searchstring varchar(500)
...
IF(ISNULL(@searchstring,'') = '')
    EXEC(@strexecsql)
ELSE
    EXEC(@strexecsql1)

来源：https://stackoverflow.com/questions/29077854/how-to-find-if-incomming-parameter-in-not-null-and-not-empty-in-sybase