| 11. 16. 1. Loop with ITERATE Statement |
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ITERATE can appear only within LOOP, REPEAT, and WHILE statements. |
ITERATE means "do the loop again." |
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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
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You can use ITERATE in a LOOP, WHILE, or REPEAT control to indicate that the control should iterate through the statements in the loop again. |
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mysql>
mysql>
mysql> DELIMITER //
mysql> CREATE PROCEDURE myProc (IN in_count INT)
-> BEGIN
-> DECLARE count INT default 0;
->
-> increment: LOOP
-> SET count = count + 1;
-> IF count < 20 THEN ITERATE increment; END IF;
-> IF count > in_count THEN LEAVE increment;
-> END IF;
-> END LOOP increment;
->
-> SELECT count;
-> END
-> //
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER ;
mysql>
mysql> call myProc(5);
+-------+
| count |
+-------+
| 20 |
+-------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql>
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