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13.6.5.5 LOOP Syntax

Contents
  1. [begin_label:] LOOP
  2.     statement_list
  3. END LOOP [end_label]

LOOP implements a simple loop construct, enabling repeated execution of the statement list, which consists of one or more statements, each terminated by a semicolon (;) statement delimiter. The statements within the loop are repeated until the loop is terminated. Usually, this is accomplished with a LEAVE statement. Within a stored function, RETURN can also be used, which exits the function entirely.

Neglecting to include a loop-termination statement results in an infinite loop.

A LOOP statement can be labeled. For the rules regarding label use, see Section 13.6.2, “Statement Label Syntax”.

Example:

  1. CREATE PROCEDURE doiterate(p1 INT)
  2. BEGIN
  3.   label1: LOOP
  4.     SET p1 = p1 + 1;
  5.     IF p1 < 10 THEN
  6.       ITERATE label1;
  7.     END IF;
  8.     LEAVE label1;
  9.   END LOOP label1;
  10.   SET @x = p1;
  11. END;

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Document created the 26/06/2006, last modified the 26/10/2018
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