This is because SQLPlus does the substitution before executing the block, and thus the
entered value is inserted into the code as a literal, not as a bind variable.
eg,
accept x prompt 'Enter x:'
begin
if &&x = 2 then
do_something;
end if;
end;
If the user enters 100, then the block becomes:
begin
if 100 = 2 then
do_something;
end if;
end;
However, if the user doesn't enter anything, x is replaced with nothing, leaving the
block as:
begin
if = 2 then
do_something;
end if;
end;
which produces an execution error.
One way around this is to ensure there's always a correct argument in that position,
eg:
begin
if '&&x' = '2' then
do_something;
end if;
end;
For null entry, this would give:
begin
if '' = '2' then
do_something;
end if;
end;
which works.
HTH
-a
>>> [EMAIL PROTECTED] 14/3/2002 1:43:24 >>>
This message has been scanned by MAILSweeper.
************************************************************
I'm writing an anonymous PL/SQL block that accepts various input from
SQL*Plus via ACCEPT commands. I then take the SQL input and use it in the
block, usually by assigning it to a PL/SQL variable.
If no value is specified on the ACCEPT line, it appears that nothing is
passed into PL/SQL, not even NULL. I tried using NVL(&&variable,0) to
reassign the supposed NULL to a 0, but the program returns an error that
nothing exists in place of &&variable.
Any ideas how to catch this null, which I want to be a viable option (e.g.,
if the &&varible is NULL then perform certain operations).
Thanks much
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Author: Arn Klammer
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