13.6.5.5 LOOP Syntax

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:

DELIMITER $$

CREATE PROCEDURE doiterate(p1 INT)
BEGIN
    label1: LOOP
        SET p1 = p1 + 1;

        IF p1 < 10 THEN
            ITERATE label1;
        END IF;

        LEAVE label1;
    END LOOP label1;

    SET @x = p1;
END;