mysqlprocedure存储过程循环，条件判断范例

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了mysqlprocedure存储过程循环，条件判断范例，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含3215字，纯文字阅读大概需要5分钟。

内容图文

mysql procedure存储过程循环，条件判断实例 本文转载自:???? http://www.111cn.net/database/mysql/38878.htm ? ? mysql教程 procedure存储过程循环，条件判断实例 ? mysql delimiter $$ mysql CREATE PROCEDURE myProc() ??? - DETERMINISTIC ??? - BEGIN ?

本文转载自:???? http://www.111cn.net/database/mysql/38878.htm

mysql教程 procedure存储过程循环，条件判断实例

mysql> delimiter $$
mysql> CREATE PROCEDURE myProc()
??? -> DETERMINISTIC
??? -> BEGIN
??? ->?? DECLARE counter INT DEFAULT 0;
??? ->
??? ->?? simple_loop: LOOP
??? ->???? SET counter=counter+1;
??? ->???? select counter;
??? ->???? IF counter=10 THEN
??? ->??????? LEAVE simple_loop;
??? ->???? END IF;
??? ->?? END LOOP simple_loop;
??? ->?? SELECT 'I can count to 10';
??? -> END$$
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> delimiter ;
mysql>
mysql> call myProc();
+---------+
| counter |
+---------+
|?????? 1 |
+---------+
1 row in set (0.00 sec)

+---------+
| counter |
+---------+
|?????? 2 |
+---------+
1 row in set (0.02 sec)

+---------+
| counter |
+---------+
|?????? 3 |
+---------+
1 row in set (0.02 sec)

+---------+
| counter |
+---------+
|?????? 4 |
+---------+
1 row in set (0.02 sec)

+---------+
| counter |
+---------+
|?????? 5 |
+---------+
1 row in set (0.02 sec)

+---------+
| counter |
+---------+
|?????? 6 |
+---------+
1 row in set (0.02 sec)

+---------+
| counter |
+---------+
|?????? 7 |
+---------+
1 row in set (0.02 sec)

+---------+
| counter |
+---------+
|?????? 8 |
+---------+
1 row in set (0.02 sec)

+---------+
| counter |
+---------+
|?????? 9 |
+---------+
1 row in set (0.33 sec)

+---------+
| counter |
+---------+
|????? 10 |
+---------+
1 row in set (0.33 sec)

+-------------------+
| I can count to 10 |
+-------------------+
| I can count to 10 |
+-------------------+
1 row in set (0.33 sec)

Query OK, 0 rows affected (0.33 sec)

实例二

mysql> CREATE PROCEDURE myProc()
??? -> BEGIN
??? ->???? DECLARE i int;
??? ->???? SET i=1;
??? ->???? myloop: LOOP
??? ->????????? SET i=i+1;
??? ->????????? IF i=10 THEN
??? ->?????????????????? LEAVE myloop;
??? ->????????? END IF;
??? ->???? END LOOP myloop;
??? ->???? SELECT 'I can count to 10';
??? ->
??? -> END$$
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> delimiter ;
mysql>
mysql> call myProc();
+-------------------+
| I can count to 10 |
+-------------------+
| I can count to 10 |
+-------------------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec

带有条件

mysql> create procedure increment (IN in_count INT)
??? -> BEGIN
??? -> declare count INT default 0;
??? ->
??? ->???? increment: loop
??? ->???????? set count = count + 1;
??? ->???????? if count < 20 then
??? ->???????????? iterate increment;
??? ->???????? end if;
??? ->???????? if count > in_count then
??? ->???????????? leave increment;
??? ->???????? end if;
??? ->???? end loop increment;
??? ->???? select count;
??? -> END
??? -> //
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> delimiter ;
mysql> call increment(3);
+-------+
| count |
+-------+
|??? 20 |
+-------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

?

内容总结

以上是互联网集市为您收集整理的mysqlprocedure存储过程循环，条件判断范例全部内容，希望文章能够帮你解决mysqlprocedure存储过程循环，条件判断范例所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端