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MySQL Tutorial/Procedure Function/Default - История изменений
2026-04-04T00:51:54Z
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в 13:44, 26 мая 2010
2010-05-26T13:44:56Z
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Admin: 1 версия
2010-05-26T09:53:40Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Declare variable with default value==<br />
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<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
mysql><br />
mysql> delimiter $$<br />
mysql><br />
mysql> CREATE PROCEDURE myProc()<br />
-> BEGIN<br />
-> DECLARE my_pi FLOAT /* Floating point number*/<br />
-> DEFAULT 3.1415926; /* initialized as PI */<br />
-><br />
-> select "my_pi="+my_pi;<br />
-> END$$<br />
Query OK, 0 rows affected (0.00 sec)<br />
mysql> delimiter ;<br />
mysql><br />
mysql> call myProc();<br />
+----------------+<br />
| "my_pi="+my_pi |<br />
+----------------+<br />
| 3.141592502594 |<br />
+----------------+<br />
1 row in set (0.00 sec)<br />
Query OK, 0 rows affected, 1 warning (0.00 sec)<br />
mysql><br />
mysql> drop procedure myProc;<br />
Query OK, 0 rows affected (0.00 sec)<br />
mysql><br />
mysql></source><br />
<br />
<br />
<br />
== Integer variable with default value==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
mysql><br />
mysql> delimiter $$<br />
mysql> CREATE PROCEDURE myProc()<br />
-> BEGIN<br />
-><br />
-> DECLARE l_int1 INT DEFAULT -2000000;<br />
-><br />
-> select l_int1;<br />
-><br />
-> END$$<br />
Query OK, 0 rows affected (0.02 sec)<br />
mysql> delimiter ;<br />
mysql><br />
mysql> call myProc();<br />
+----------+<br />
| l_int1 |<br />
+----------+<br />
| -2000000 |<br />
+----------+<br />
1 row in set (0.00 sec)<br />
Query OK, 0 rows affected (0.00 sec)<br />
mysql><br />
mysql> drop procedure myProc;<br />
Query OK, 0 rows affected (0.00 sec)<br />
mysql></source></div>
Admin