Firebird 2.1 Language Reference Update

Notes:
PSQL statements
as
begin
for select town, pop from towns into :town, :pop as cursor tcur do
begin
if (town = towntodelete)
then delete from towns where current of tcur;
else suspend;
end
end
• A “FOR UPDATE” clause is allowed in the SELECT statement., but not required for a positioned update or
delete to succeed.
• Make sure that cursor names defined here do not clash with any names created earlier on in DECLARE CUR-
SOR statements.
• AS CURSOR is not supported in FOR EXECUTE STATEMENT loops, even if the statement to execute is a
suitable SELECT query.
Available in: PSQL
Added in: 1.5
Changed in: 2.0
LEAVE
Description: LEAVE immediately terminates the innermost WHILE or FOR loop. With the optional label argument
introduced in Firebird 2.0, LEAVE can break out of surrounding loops as well. Execution continues with
the first statement after the outermost terminated loop.
Syntax:
Example:
[label:]
{FOR | WHILE} ... DO
...
(possibly nested loops, with or without labels)
...
LEAVE [label];
If an error occurs during the insert in the example below, the event is logged and the loop terminated.
The program continues at the line of code reading “c = 0;”
while (b < 10) do
begin
insert into Numbers(B) values (:b);
b = b + 1;
when any do
begin
execute procedure log_error (current_timestamp, 'Error in B loop');
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