LOOP

Synopsis

[label :] LOOP
    statements
END LOOP

Description

The LOOP statement is an optional construct in SQL routines to allow processing of a block of statements repeatedly. The block of statements is processed until an explicit use of LEAVE causes processing to exit the loop. If processing reaches END LOOP, another iteration of processing from the beginning starts. LEAVE statements are typically wrapped in an IF statement that declares a condition to stop the loop. The optional label before the LOOP keyword can be used to name the block.

Examples

The following function counts up to 100 in a loop starting from the input value i and returns the number of incremental steps in the loop to get to 100.

FUNCTION to_one_hundred(i int)
  RETURNS int
  BEGIN
    DECLARE count int DEFAULT 0;
    abc: LOOP
      IF i >= 100 THEN
        LEAVE abc;
      END IF
      SET count = count + 1;
      SET i = i + 1;
    END LOOP;
    RETURN;
  END

Further examples of varying complexity that cover usage of the LOOP statement in combination with other statements are available in the SQL routines examples documentation.

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