first name and collection methods
Hello
Billy explained in a recent thread that do not use such and .last methods. Can someone explain this indetail. What are the problems, we will be facing if we use these?
https://forums.Oracle.com/thread/2590384
A loop in a table (do not use . First and . Last methods but if you fully realize the consequences of this):
- Start
- ...
- for I in 1.myArray. Counting loop
- .. do something with myArray (i)
- end loop;
I prefer the following construction:
I: = myArray.first;
loop
output I have is zero;
do something with myArray (i);
I: = myArray.next (i);
end loop;
It works on the associative and normal collections.
Also, it will not fail if the collection is null.
According to the first, last or 1.count will give an error with the rare collections, when indexes are not contiguous.
For example, a collection where myArray (1) and myArray (3) exist, but there is no such thing as myArray (2).
declare
type t_myArray is table of index varchar2 (64) by pls_integer;
myArray t_myArray;
Start
myArray (1): = "foo";
myArray (3): = 'bar ';
because me in 1.myArray.count
loop
dbms_output.put_line (myArray (i));
end loop;
end;
This will give an ora-01403 no data found
in the same way:
declare
type t_myArray is table of index varchar2 (64) by pls_integer;
myArray t_myArray;
Start
myArray (1): = "foo";
myArray (3): = 'bar ';
I'm in myArray.first... myArray.last
loop
dbms_output.put_line (myArray (i));
end loop;
end;
will also give ora-01403
but it works perfectly:
declare
type t_myArray is table of index varchar2 (64) by pls_integer;
myArray t_myArray;
I have pls_integer;
Start
myArray (1): = "foo";
myArray (3): = 'bar ';
i: = myArray.first;
loop
output I have is zero;
dbms_output.put_line (myArray (i));
I: = myArray.next (i);
end loop;
end;
Tags: Database
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