Firebird 2.1 Language Reference Update

|| ')';
execute statement stmt;
end
Warning
PSQL statements
Although this form of EXECUTE STATEMENT can also be used with all kinds of DDL strings (except CRE-
ATE/DROP DATABASE), it is generally very, very unwise to use this trick in order to circumvent the no-DDL
rule in PSQL.
One row of data returned
This form is used with singleton SELECT statements.
Syntax:
Example:
EXECUTE STATEMENT INTO [, ...]
::= An SQL statement returning at most one row of data.
::= A PSQL variable, optionally preceded by “:”
create procedure DynamicSampleTwo (TableName varchar(100))
as
declare variable param int;
begin
execute statement
'select max(CheckField) from ' || TableName into :param;
if (param > 100) then
exception Ex_Overflow 'Overflow in ' || TableName;
end
Any number of data rows returned
This form – analogous to “FOR SELECT ... DO” – is used with SELECT statements that may return a multi-row
dataset.
Syntax:
Example:
FOR EXECUTE STATEMENT INTO [, ...]
DO
::= Any SELECT statement.
::= A PSQL variable, optionally preceded by “:”
create procedure DynamicSampleThree
( TextField varchar(100),
TableName varchar(100) )
returns
( LongLine varchar(32000) )
102