в 13:44, 26 мая 2010

2010-05-26T13:44:56Z

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2010-05-26T09:53:33Z

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== IF statement in a While loop==



<source lang="sql">
mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc()
-> BEGIN
->
-> DECLARE i int;
-> SET i=1;
-> loop1: WHILE i<=10 DO
-> IF MOD(i,2)<>0 THEN /*Even number - try again*/
-> SELECT CONCAT(i," is an odd number");
-> END IF;
-> SET i=i+1;
-> END WHILE loop1;
-> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> delimiter ;
mysql> call myProc();
+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 1 is an odd number |
+-------------------------------+
1 row in set (0.02 sec)
+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 3 is an odd number |
+-------------------------------+
1 row in set (0.02 sec)
+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 5 is an odd number |
+-------------------------------+
1 row in set (0.02 sec)
+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 7 is an odd number |
+-------------------------------+
1 row in set (0.02 sec)
+-------------------------------+
| CONCAT(i," is an odd number") |
+-------------------------------+
| 9 is an odd number |
+-------------------------------+
1 row in set (0.02 sec)
Query OK, 0 rows affected (0.38 sec)
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql></source>

== While loop==



<source lang="sql">
mysql>
mysql>
mysql> delimiter //
mysql> create procedure test_while (IN in_count INT)
-> BEGIN
-> declare count INT default 0;
->
-> while count < 10 do
-> set count = count + 1;
-> end while;
->
-> select count;
-> END
-> //
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> delimiter ;
mysql>
mysql> call test_while(10);
+-------+
| count |
+-------+
| 10 |
+-------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> drop procedure test_while;
Query OK, 0 rows affected (0.00 sec)</source>

== WHILE Statement==

<p>The WHILE statement is another mechanism to loop over a set of statements until a condition is true.</p>



<source lang="sql">
[begin_label:] WHILE search_condition DO
statement_list
END WHILE [end_label]</source>

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в 13:44, 26 мая 2010

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