13.6.5.6 REPEAT Syntax

The statement list within a REPEAT statement is repeated until the search_condition expression is true. Thus, a REPEAT always enters the loop at least once. statement_list consists of one or more statement, each terminated by a semicolon(;) statement delimiter.

A REPEAT statement can be labeled. For the rules regarding label use, see Section 13.6.2, "Statement Label Syntax".

Example:

CREATE PROCEDURE dorepeat2(p1 INT)
BEGIN
    SET @x = 0;
    REPEAT 
        SET @x = @x+ 1;
    UNTIL @x > p1 END REPEAT;
END
$$
Query OK, 0 rows affected (0.00 sec)

mysql> select @x;
    -> $$
+------+
| @x   |
+------+
|   11 |
+------+
1 row in set (0.00 sec)