I'm writing Sybase procedure and ran into a problem: how to break inside of a for loop. It just gives me syntax error. Is it possible to skip the current row and go to the next one in for loop?
for TmpUserEvents as TmpUserCursorEvents dynamic scroll cursor for
select
*
from
test
do
if flag = 1 then
continue; --break;
end if;
end for;
To answer my own question: it is possible to continue for loop while executing.
for TmpUserEvents as TmpUserCursorEvents dynamic scroll cursor for
select
*
from
test
do
lbl:
loop
if condition = 1 then
leave lbl;
end if;
end loop lbl;
end for;
Related
Will the first while loop continue after I have exited fork/join_any? I see the message "iam here" after the message "after join any".
I expect that the first while loop will stop when I exit fork/join_any.
Is that not the case?
fork
begin
while(1)
begin
#(posedge trigger_clock);
do something
$info("i am here");
end
end
begin
while(1)
begin
#(posedge trigger_clock);
if(condition is true)
begin
break;
end
end
end
join_any
$info("after join any");
As you have observed, the top while loop continues to execute even when you exit the fork when the bottom while loop completes. This is expected.
If you want the top while loop to stop executing when you exit the fork, you can use the disable fork statement:
fork
// ...
join_any
disable fork;
$info("after join any");
Refer to IEEE Std 1800-2017, section 9.6 Process control.
I have a small problem which I believed I could solve simply, it turns out I'm not able to figure out.
I have following query:
SELECT custom_field
INTO v_start_of_invoice
FROM BILL
WHERE BIMA_TRACKING_ID = v_previous_BIMAtrackingID
AND BSCO_CODE_ID = 'PRPAYMENT'
AND PREP_SEQ_NUM = 0
AND ITEM_CAT_CODE_ID = 1
AND PARTITION_KEY = v_prev_partition
AND SUBPARTITION_KEY = v_prev_subpartition;
What I would like to achieve here is to give to variable v_start_of_invoice the value "0" if one or all the where condition are not met.
In simple word I don't want the script to fail but I want the variable either to be set with some value if all the where conditions are matched, otherwise I want to assign the value 0.
I'm sure there are quite a few ways but I need to check what could be the best way to achieve that.
Many Thks in advance
M.
You seem to have a misunderstanding of what the exception block actually does. First off you cannot avoid the exception. If you use "select into" the query is successful only when exactly 1 row is returned. Otherwise PLSQL will internally raise the NO_DATA_FOUND when the query returns 0 rows, and TOO_MANY_ROWS when it returns more then 1 row. The exception block tells PLSQL what to do when an error is generated. Basically the exception block tells what action to take on specific errors and whether to continue error processing or discard the error. (Check the RAISE and RAISE_APPLICATION_ERROR statements.)
Keep in mind that blocks can be nested. With this in mind and in context of a outer block the solution offered by #are is exactly what you want. The structure becomes:
Begin
.
.
.
begin
place #are's code here.
end ;
-- Continue your code here: The Error has been handled and execution continues as though the exception never happened.
.
.
.
end;
As far as the "NVL(v_start_of_invoice, 0);" it's a function that will return 0 if v_start_of_invoice is NULL and v_start_of_invoice otherwise. Note the value of INTO variables is not it the select generates an error unless you set it in the exception block.
begin
SELECT custom_field
INTO v_start_of_invoice
FROM BILL
WHERE BIMA_TRACKING_ID = v_previous_BIMAtrackingID
AND BSCO_CODE_ID = 'PRPAYMENT'
AND PREP_SEQ_NUM = 0
AND ITEM_CAT_CODE_ID = 1
AND PARTITION_KEY = v_prev_partition
AND SUBPARTITION_KEY = v_prev_subpartition;
exception WHEN NO_DATA_FOUND THEN
v_start_of_invoice := 0;
end;
I have this code:
values_nodelay = no_of_values(2:2:end)
no_of_values_x1 = (find(u~=[u(2:end), u(end)+1]));
no_of_values_x1 = no_of_values_x1(2:2:end)
l = 1;
delay = 2;
values_delay = [];
while l<=length(values_nodelay)
values_delay_temp = values_nodelay(l)-delay;
if delay>values_delay_temp
end
values_delay = [values_delay, values_delay_temp];
l = l+1;
end
values_delay
I need a goto or jump function to the beginning of while, or an equivalent if anyone
knows an easier way, that if delay > values_delay_temp, it won't become part of the final vector values_delay. Instead, I want to skip it and continue again with the while loop.
Rather than using jumps like continue or break, you could just do this:
if delay<=values_delay_temp
values_delay=[values_delay, values_delay_temp];
end
In other words make the "default" behavior of the loop to do nothing, and then only increment your vector when you hit the right condition. It's much clearer and easier to debug.
Also instead of using vector concatenation like you have, I've found it's more efficient to do values_delay(end+1) = values_delay_temp; if you have to grow a vector in a loop.
The continue statement will stop the execution of a loop for the current iteration and continue with the next iteration, e.g.
while foo
# stuff that will execute for all iterations
if bar
continue
end
# stuff that won't execute if bar is false
end
Although, in your specific case, why don't you just issue
values_delay=[values_delay, values_delay_temp];
and increase the loop counter when
delay <= values_delay_temp
is true?
I want to write a code for postgis in pgAdmin that is based on postgresql. It defines a 3-dimensional array of geometry.
I used this code for it:
DECLARE
G geometry[9][9][9];
BEGIN
for i IN 1..9 LOOP
for j IN 1..9 LOOP
for k IN 1..9 LOOP
G[i][j][k] := [value that I want];
END LOOP;
END LOOP;
END LOOP;
But it returned this error:
"array subscript out of range"
I used this instead:
DECLARE
G geometry[9][9][9];
BEGIN
for i IN array_lower(G, 1)..array_upper(G, 1) LOOP
for j IN array_lower(G, 1)..array_upper(G, 1) LOOP
for k IN array_lower(G, 1)..array_upper(G, 1) LOOP
G[i][j][k] := [value that I want];
END LOOP;
END LOOP;
END LOOP;
I have a different error this time:
"lower bound of FOR loop cannot be null"
I used this in BEGIN Part and solved all the errors:
G[1][1][1] := '01010000200400000000000000000000000000000000000000';
But I think this is not true and doesn't calculate all of the iterations for loops. I think this takes in account only the G[1][1][1]. What should I do now?
In PostgreSQL, simply declaring the array dimensions does not initialize or pre-allocate anything. The array is dynamic in all its dimensions. That differs significantly from the multi-dimensional array implementations found in general programming language like C.
To mimic the logic of these languages, you may first initialize the 9x9x9 array with a statement like this:
G:=array_fill('point(0 0)'::geometry, array[9,9,9]);
Then the rest of the code will just work when refering to G[i][j][k] either as source or destination of assignments.
I am pulling data from table Supervisors. Through each iteration, I want to know when Supervisor.SupNum changes. If the value changes, do this. If it stays the same, do the other.
How would I accomplish this?
try this.
if (Supervisor.SupNum = chk) then
flag =true; else
chk := Supervisor.SupNum; flag =false end if;
If you want the first iteration to be true then have another iterator i.
if (i=0) then Supervisor.SupNum := chk; end if; i++;