1.REPEAT
代碼如下:
REPEAT
Statements;
UNTIL expression
END REPEAT
demo
DECLARE num INT;
DECLARE my_string VARCHAR(255);
REPEAT
SET my_string =CONCAT(my_string,num,',');
SET num = num +1;
UNTIL num <5
END REPEAT;

2.WHILE

代碼如下:
WHILE expression DO
Statements;
END WHILE
demo
DECLARE num INT;
DECLARE my_string VARCHAR(255);
SET num =1;
SET str ='';
WHILE num < span>10DO
SET my_string =CONCAT(my_string,num,',');
SET num = num +1;
END WHILE;

3.LOOP(這里面有非常重要的ITERATE,LEAVE)

代碼如下:
DECLARE num INT;
DECLARE str VARCHAR(255);
SET num =1;
SET my_string ='';
loop_label: LOOP
IF num <10THEN
LEAVE loop_label;
ENDIF;
SET num = num +1;
IF(num mod3)THEN
ITERATE loop_label;
ELSE
SET my_string =CONCAT(my_string,num,',');
ENDIF;
END LOOP;

PS:可以這樣理解ITERATE就是我們程序中常用的contiune,而ITERATE就是break.當然在MySQL存儲過程,需要循環結構有個名稱,其他都是一樣的.

官方的文檔-->http://dev.mysql.com/doc/refman/5.0/en/loop.html

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