mysql functions实例：检查mysql版本

在mysql存储过程中，使用mysql函数version()检测mysql数据库的版本。

代码：

mysql> delimiter $$
mysql> CREATE PROCEDURE myProc() //创建存储过程
    -> BEGIN
    ->
    ->   IF (CAST(SUBSTR(version(),1,3) AS DECIMAL(2,1)) <5.0) THEN
    ->     SELECT 'MySQL versions earlier than 5.0'; //检测mysql版本
    ->   ELSE
    ->     SELECT 'Thank you are running 5.0 or higher!';
    ->   END IF;
    ->
    -> END$$
Query OK, 0 rows affected (0.02 sec)

mysql> delimiter ;
mysql> call myProc(); //调用存储过程  输出当前mysql数据库的版本
+--------------------------------------+
| Thank you are running 5.0 or higher! |
+--------------------------------------+
| Thank you are running 5.0 or higher! |
+--------------------------------------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.02 sec)

mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)