Executing operating system command within trigger or procedure

Question

Hello
Can some one help me out as how to execute operating system command (unix or windows ex.. stop,start,cc,del or copy etc...) in a trigger or procedure.
My requirement is, if some predefined error occure then listener listener should be stopped automatically.
Thanks in advance
kvss

Answer 1

Here is some code to tell you how to do:
First a small Java program that taker a string as a parameter and executes it as an os-command
import java.lang.Runtime;
import java.lang.Process;
public class Commands extends Object {
* Constructor
public Commands() {
// On NT the command should be like this "cmd /c del c:\temp\readme.txt"
// exec execute('cmd /c del c:\temp\readme.txt');
public static void execute (String cmd ) {
try {
Process p = Runtime.getRuntime().exec(cmd);
try {
p.waitFor();
catch (java.lang.InterruptedException intex ) {
intex.printStackTrace();
System.out.println("Return = "+ p.exitValue());
System.out.println(" Done ...");
catch ( java.io.IOException iox) {
iox.printStackTrace();
===================end of java ====
Use loadjava to load it into the database and create a pl/sql wrapper around the java code.
See the manual about loadjava details.
Log in to sqlplus as SYSTEM and create a role for this purpose e.g. 'JAVA_ROLE'
and exec the following as SYSTEM or SYS to make sure the user has the the needed privs.
dbms_java.grant_permission('JAVA_ROLE','SYS:java.io.FilePermission','<<ALL FILES>>','read,write,execute,delete');
dbms_java.grant_permission('JAVA_ROLE','SYS:java.lang.RuntimePermission','writeFileDescriptor',null);
dbms_java.grant_permission('JAVA_ROLE','SYS:java.lang.RuntimePermission','readFileDescriptor',null);
and you're done.