How can I get a limited number of records from the table in Progress OpenEdge database?
Something like in SQL:
SELECT TOP 100 * FROM MyTable
The only ugly solution I can find is looping through all records and breaking when 100 of them were displayed. But feels like there should be some better way of doing it.
If you are using the 4GL you might also want to look at using OPEN QUERY and MAX-ROWS to achieve the result that you are looking for. The following shows a traditional FOR EACH loop with a counter and then a QUERY with MAX-ROWS:
define variable i as integer no-undo.
define frame a with 10 down.
for each customer no-lock break by name:
i = i + 1.
display i custNum name discount.
if i >= 5 then leave.
end.
define query q for customer scrolling.
open query q for each customer no-lock break by name max-rows 5.
do i = 1 to 5 with frame a:
get next q.
display i custNum name discount.
end.
If you are using the SQL-92 engine then something like:
SELECT TOP 100 FROM pub.customer;
should work just fine.
If you are using the 4GL engine then you should not be attempting to blend SQL with 4GL. It will only lead to pain, misery and agony. The 4GL is not SQL. There are a few SQL-89 statements that were put in the 4GL a long, long time ago for marketing reasons. Trying to use them will result in severe emotional trauma. You have been warned.
Please follow the link to download the file. Hoping that the question will answer on it OpenEdge Database
DEFINE VARIABLE i AS INTEGER NO-UNDO.
FOR EACH customer NO-LOCK with width 320:
ASSIGN i = i + 1.
if i <= 100 then
DISP CustNum Address Balance City Contact
Country CreditLimit Discount
Name Phone PostalCode SalesRep State Terms .
END.
