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Rechercher dans le manuel MySQL

13.6.6 Cursors

Contents

[+/-]

13.6.6.1 Cursor CLOSE Syntax
13.6.6.2 Cursor DECLARE Syntax
13.6.6.3 Cursor FETCH Syntax
13.6.6.4 Cursor OPEN Syntax

MySQL supports cursors inside stored programs. The syntax is as in embedded SQL. Cursors have these properties:

  • Asensitive: The server may or may not make a copy of its result table

  • Read only: Not updatable

  • Nonscrollable: Can be traversed only in one direction and cannot skip rows

Cursor declarations must appear before handler declarations and after variable and condition declarations.

Example:

  1. CREATE PROCEDURE curdemo()
  2. BEGIN
  3.   DECLARE done INT DEFAULT FALSE;
  4.   DECLARE a CHAR(16);
  5.   DECLARE b, c INT;
  6.   DECLARE cur1 CURSOR FOR SELECT id,data FROM test.t1;
  7.   DECLARE cur2 CURSOR FOR SELECT i FROM test.t2;
  8.   DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
  9.  
  10.   OPEN cur1;
  11.   OPEN cur2;
  12.  
  13.   read_loop: LOOP
  14.     FETCH cur1 INTO a, b;
  15.     FETCH cur2 INTO c;
  16.     IF done THEN
  17.       LEAVE read_loop;
  18.     END IF;
  19.     IF b < c THEN
  20.       INSERT INTO test.t3 VALUES (a,b);
  21.     ELSE
  22.       INSERT INTO test.t3 VALUES (a,c);
  23.     END IF;
  24.   END LOOP;
  25.  
  26.   CLOSE cur1;
  27.   CLOSE cur2;
  28. END;

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