OpenEuphoria

Re: database.e record numbers & replace data

• Posted by Robert Craig <rds at ATTCANADA.NET> May 04, 2000
• 411 views

Tony Steward writes:
> I am experimenting with the new database.e,
> db_replace_data(i,x) does not seem to work
> i keep getting an error expected to see expression
> not procedure.

db_replace_data() is a procedure, meaning it does not
return a value. Only functions return values. Some of
the database routines are functions, others are procedures.
Many of the routines return an error code. db_replace_data()
does not - it will call the fatal error handler if you pass it
an invalid record number.

> Also to delete a record you need the record number.
> How do you get the rn and how can you move around by rn.

You can get the record number from the key value for that
record, by calling db_find_key(). If you don't know the
key value, you will have to search for the record by starting
at record number 1 and looping until the record number
given by db_table_size().  e.g.

   recnum = 1
   while recnum <= db_table_size() do
        data = db_record_data(recnum)
         if data[1] = 997 and equal(data[2], "Tony") then
             db_delete_record(recnum)
         end if
         recnum += 1
   end while

There are no routines such as "get next record" or
"get previous record", since you can
simply increment/decrement the record number to move to
the next/previous  record in a table.

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com