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13.6.2 Statement Label Syntax

Contents
  1. [begin_label:] BEGIN
  2.     [statement_list]
  3. END [end_label]
  4.  
  5. [begin_label:] LOOP
  6.     statement_list
  7. END LOOP [end_label]
  8.  
  9. [begin_label:] REPEAT
  10.     statement_list
  11. UNTIL search_condition
  12. END REPEAT [end_label]
  13.  
  14. [begin_label:] WHILE search_condition DO
  15.     statement_list
  16. END WHILE [end_label]

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:

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

The scope of a block label does not include the code for handlers declared within the block. For details, see Section 13.6.7.2, “DECLARE ... HANDLER Syntax”.


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