LEAVE

Примечание

Ниже приведена оригинальная документация Trino. Скоро мы ее переведем на русский язык и дополним полезными примерами.

Synopsis

LEAVE label

Description

The LEAVE statement allows processing of blocks in SQL routines to move out of a specified context. Contexts are defined by a label. If no label is found, the functions fails with an error message.

Examples

The following function includes a LOOP labelled top. The conditional IF statement inside the loop can cause the exit from processing the loop when the value for the parameter p is 1 or less. This can be the case if the value is passed in as 1 or less or after a number of iterations through the loop.

FUNCTION my_pow(n int, p int)
RETURNS int
BEGIN
  DECLARE r int DEFAULT n;
  top: LOOP
    IF p <= 1 THEN
      LEAVE top;
    END IF;
    SET r = r * n;
    SET p = p - 1;
  END LOOP;
  RETURN r;
END

Further examples of varying complexity that cover usage of the LEAVE statement in combination with other statements are available in the SQL routines examples documentation.

See also

• Introduction to SQL routines

• ITERATE