Statement Label Syntax

Labels are permitted for BEGIN ... END blocks and for the LOOP, REPEAT, and WHILE statements. Label use for those statements follows these rules:

• begin_label must be followed by a colon.
• begin_label can be given without end_label. If end_label is present, it must be the same as begin_label.
• end_label cannot be given without begin_label.
• Labels at the same nesting level must be distinct.
• Labels can be up to 16 characters long.

To refer to a label within the labeled construct, use an ITERATE or LEAVE statement. The following example uses those statements to continue iterating or terminate the loop:

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;
END;

The scope of a block label does not include the code for handlers declared within the block. For details, see , "DECLARE ... HANDLER Syntax".

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