是否可以在mysql触发器中调用网址（http：//）？

Question

是否有可能从MySQL触发器调用网址？

例如：我为插入创建了一个触发器。那时候，我想调用一个网址，如http://www.example.com/。

Answer 1

不能直接 - 你必须创建一个user-defined function和它挂在

P.S：这听起来像使用数据库的可怕方式。

Answer 2

我希望这篇文章能够对您有用

来源：http://vorachet.blogspot.com/2013/03/how-to-install-mysql-udf-on-centos.html

How to install MySQL UDF on CENTOS 
How to install MySQL UDF on CENTOS 

Step1. Download the MYSQL UDF at https://github.com/mysqludf/lib_mysqludf_sys 

Step2. Run make script 
The default make file written by the project owner at step1 does not works for CentOS 64bit 
We need a bit customization as follow. 
gcc -Wall -m64 -I/usr/include/mysql -I. -shared lib_mysqludf_sys.c -o /usr/lib/lib_mysqludf_sys.so -fPIC 

Precondition: Make sure you have MySQL header files. You can prepare the header files using this command. 
yum install mysql-devel.x86_64 

Step3. Configure plugin dir in /etc/my.cnf 
... 
[mysqld] 
plugin_dir=/var/lib/mysql/plugin 
... 

NOTES: Do not forget to change directory owner to mysql 
chown mysql: mysql -R /var/lib/mysql/plugin 

Step4. Copy library to plugin dir 
cp /usr/lib/lib_mysqludf_sys.so /var/lib/mysql/plugin 

Step5. Restart MYSQL and Execute this SQL statements 

DROP FUNCTION IF EXISTS lib_mysqludf_sys_info; 
DROP FUNCTION IF EXISTS sys_get; 
DROP FUNCTION IF EXISTS sys_set; 
DROP FUNCTION IF EXISTS sys_exec; 
DROP FUNCTION IF EXISTS sys_eval; 
CREATE FUNCTION lib_mysqludf_sys_info RETURNS string SONAME 'lib_mysqludf_sys.so'; 
CREATE FUNCTION sys_get RETURNS string SONAME 'lib_mysqludf_sys.so'; 
CREATE FUNCTION sys_set RETURNS int SONAME 'lib_mysqludf_sys.so'; 
CREATE FUNCTION sys_exec RETURNS int SONAME 'lib_mysqludf_sys.so'; 
CREATE FUNCTION sys_eval RETURNS string SONAME 'lib_mysqludf_sys.so' 

TESTING: SELECT sys_exec ('touch /var/lib/mysql/test.txt ') 
You should see /var/lib/mysql/test.txt after above statement is executed.