Firebird 2.1 Language Reference Update

DML statements
ROWS can also be used with the SELECT and UPDATE statements.
Available in: DSQL
Added in: 2.0
Changed in: 2.1
EXECUTE BLOCK
Description: Executes a block of PSQL code as if it were a stored procedure, optionally with input and output
parameters and variable declarations. This allows the user to perform “on-the-fly” PSQL within a DSQL context.
Syntax:
EXECUTE BLOCK [()]
[RETURNS ()]
AS
[]
BEGIN
[]
END
::= = ? [, ]
::= [, ]
::= paramname [NOT NULL] [COLLATE collation]
::= sql_datatype | [TYPE OF] domain
::= See PSQL::DECLARE for the exact syntax
Examples:
This example injects the numbers 0 through 127 and their corresponding ASCII characters into the
table ASCIITABLE:
execute block
as
declare i int = 0;
begin
while (i < 128) do
begin
insert into AsciiTable values (:i, ascii_char(:i));
i = i + 1;
end
end
The next example calculates the geometric mean of two numbers and returns it to the user:
execute block (x double precision = ?, y double precision = ?)
returns (gmean double precision)
as
begin
gmean = sqrt(x*y);
suspend;
end
59