How to call SQL function from Qt -


i have function returns integer. can't figure how call function in qt.

create function islastappversion(      @currentversion nvarchar(10),      @appcode nvarchar(128),      @serial nvarchar(128)) returns int  begin     declare @ret int     select @ret = case      when @currentversion = (select *from getapplastversion(@appcode,@serial))      1 else 0 end     return @ret end

from sql server call this:

declare @i int exec @i = dbo.islastappversion @currentversion = '2.1',@appcode = '33fdd5f4-e24b-11e3-a375-82687f4fc15c',@serial='14jt-cf3c-24b1-c1e3' print @i

how qt? tried. not working

qstring dbconnection::islastversion(qstring version, qstring appcode, qstring serialno){     qsqlquery query;     qstring result;       qstring connectionstring = connection.arg(servername).arg(dbname);     qsqldatabase db = qsqldatabase::adddatabase("qodbc");      db.setdatabasename(connectionstring);      if (db.open())     {         qdebug() << "opened";         query = db.exec("islastappversion('" + version + "','" + appcode + "','" + serialno + "');");          while(query.next()){             result = query.record().value(0).tostring();             qdebug() << "result la functie last version: " << result;         }         db.close();     }     else     {         qdebug() << "error = " << db.lasterror().text();     }     db.close();      return result; }

since function called via select statement, call sql server's built-in functions (getdate(), sum(), count())

in case like....

select dbo.islastappversion('2.1'                             ,'33fdd5f4-e24b-11e3-a375-82687f4fc15c'                             ,'14jt-cf3c-24b1-c1e3')

or if want store returned value variable this...

declare @i int; select @i = dbo.islastappversion('2.1'                                 ,'33fdd5f4-e24b-11e3-a375-82687f4fc15c'                                 ,'14jt-cf3c-24b1-c1e3')  print @i

note

also in function definition have following line

when @currentversion = (select *from getapplastversion(@appcode,@serial))

i believe getapplastversion table-values functions. if function returning multiple columns back, need select 1 1 column select statement. if there chance function can return multiple rows make sure use top 1 clause in select statement, comparing results returned function scalar value.

so need make sure function returns single value when called , comparing single value @currentversion variable.


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