Host Command in a trigger

Is it possible to use a host command from inside an oracle trigger? I am trying to execute a unix script with a trigger.

Hi
There are few options.
In 7.x
Using the dbms_pipe send ur command to the pipe and use a cron job to read the pipe and execute the command.
In 8.x, it is more interesting.
Using External libraries/procedures you can map a c or java executable/dll to a procedure and call that from the trigger.
HTH
Arvind Balaraman
null

Similar Messages

How to execute host command in trigger

dear professional:
i'm trying to create a trigger that when a certain value inserts into a table , it fires some UNIX command to do the job following
here is what i tried ,create a trigger that gives host command , but when i tried insert , it fails to work
i also tried dbms_pipe ,but seems same when using dynamic sql to do the job
any idea of how to accomplish this task ?
many thanks ~
br/ricky
SQL> CREATE OR REPLACE TRIGGER price_exec
2 BEFORE INSERT ON omc.price_test
FOR EACH ROW
BEGIN
IF :NEW.price = 4 THEN
execute immediate 'host ll';
END IF;
END price_exec;
/ 3 4 5 6 7 8 9
Trigger created.
SQL> insert into price values ('test',4);
insert into price values ('test',4)
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> insert into price_test values ('test',4);
insert into price_test values ('test',4)
ERROR at line 1:
ORA-00900: invalid SQL statement
ORA-06512: at "OMC.PRICE_EXEC", line 3
ORA-04088: error during execution of trigger 'OMC.PRICE_EXEC'

hi,
my db is 9.2
i'm aware of schedule you mentioned , but if it's up to the task , you don't know when a row with certain value is inserted
simple way :
when a row inserted into a table with value "catch me" you want to know who inserted this test value
so you tried to create a trigger to catch program, machine, module ,and terminal info from v$session
so you can figure out where it is coming from
and i want to go a step further , by executing some os command to digging out more
and i come up with this , when value 4 is inserted i exec a procedure host to execute command,
the problem is it's not working as i exepcted , so spare me the lecture of reading docs and just tell me what to do
i'd really appreciate it , thanks
CREATE OR REPLACE TRIGGER price_exec
BEFORE INSERT ON omc.price_test
FOR EACH ROW
BEGIN
IF :NEW.price = 4 THEN
execute immediate 'host('echo')';
END IF;
END;
Warning: Trigger created with compilation errors.
SQL> show errors
Errors for TRIGGER PRICE_EXEC:
LINE/COL ERROR
3/30 PLS-00103: Encountered the symbol "ECHO" when expecting one of
the following:
. ( * @ % & = - + ; < / > at in is mod not rem return
returning <an exponent (**)> <> or != or ~= >= <= <> and or
like between into using || bulk
The symbol ". was inserted before "ECHO" to continue.

Calling java host command in trigger/PLSQL

I created a java call to execute a linux host command that calls a shell script that will echo out a result. It is owned by SYS and has granted execute to SYSTEM. SYSTEM has a table that monitors accesses to the RDBMS. When a user logs on from a remote server vis sqlplus, this LOGON trigger write to the SYSTEM table (successfully). SYSTEM has a trigger that runs a linux command to execute a shell script that pulls the actual IP address from the remote system. I can run this call from a PLSQL block (outside the trigger) and get a response back like "user:101.101.101.111" but when I have the same user log on, the trigger fires - no errors or exceptions yet no rows are returned. Is there some restriction in a trigger versus just a plsql block call? The java code used is what I found on (http://www.oracle-base.com/articles/8i/ ... mPLSQL.php) and it works perfectly OUTSIDE the trigger but nothing is returned in the trigger firing steps. Any idea?
rdbms: 11.1.0.7, Redhat 4
I know the code works because I can write the host command output to a file. Later in the trigger I can open the file and can read the data that should have been returned in the java host call.

FYI - here is the code from your site that I used:
DROP JAVA SOURCE SYS."Host";
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED SYS."Host" as import java.io.*;
public class Host {
public static void executeCommand(String command) {
try {
String[] finalCommand;
if (isWindows()) {
finalCommand = new String[4];
// Use the appropriate path for your windows version.
finalCommand[0] = "C:\\windows\\system32\\cmd.exe"; // Windows XP/2003
//finalCommand[0] = "C:\\winnt\\system32\\cmd.exe"; // Windows NT/2000
finalCommand[1] = "/y";
finalCommand[2] = "/c";
finalCommand[3] = command;
else {
finalCommand = new String[3];
finalCommand[0] = "/bin/sh";
finalCommand[1] = "-c";
finalCommand[2] = command;
final Process pr = Runtime.getRuntime().exec(finalCommand);
pr.waitFor();
new Thread(new Runnable(){
public void run() {
BufferedReader br_in = null;
try {
br_in = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String buff = null;
while ((buff = br_in.readLine()) != null) {
System.out.println("Cmd results: " + buff);
try {Thread.sleep(100); } catch(Exception e) {}
br_in.close();
catch (IOException ioe) {
System.out.println("Exception caught printing process output.");
ioe.printStackTrace();
finally {
try {
br_in.close();
} catch (Exception ex) {}
}).start();
new Thread(new Runnable(){
public void run() {
BufferedReader br_err = null;
try {
br_err = new BufferedReader(new InputStreamReader(pr.getErrorStream()));
String buff = null;
while ((buff = br_err.readLine()) != null) {
System.out.println("Cmd Error: " + buff);
try {Thread.sleep(100); } catch(Exception e) {}
br_err.close();
catch (IOException ioe) {
System.out.println("Exception caught printing process error.");
ioe.printStackTrace();
finally {
try {
br_err.close();
} catch (Exception ex) {}
}).start();
catch (Exception ex) {
System.out.println(ex.getLocalizedMessage());
public static boolean isWindows() {
if (System.getProperty("os.name").toLowerCase().indexOf("windows") != -1)
return true;
else
return false;
/

Use Host command in Oracle Database Trigger

I need to run Host command from a database trigger in order to execute a sh file in a Solaris, Unix, environment. How can I do it? The database environment is in Solaris and the database is 10g.
Please let me know as soon as possible.

Hi,
read this <http://devtrigger.blogspot.com.br/2012/08/svn-backup-on-unix-or-solaris.html>
Or
you can to run in nohup. For example
You can a script with the command vi about your trigger and run with the sintaxe bellow:
nohup sqlplus "/as sysdba" @script.sql &
Where "script.sql" is the name of the your file.
Kind regards,
Bruno Reis.
www.brunors.com

How to run a HOST command from Report 2.5

Hello everybody,
I want to pass an unix command from a Report. I am running the report (Report 2.5) on an Unix server and I want to pass a unix host command inside the Before Report Trigger of the report. But Report2.5 is not recognising the HOST built-in. Is there is any way around?
Thank in advance.
Samujjwal Basu

First off is that openssl command correct? Should it be this instead:
openssl pkcs8 -inform der -nocrypt -in test.der -out result.pem
Try out your openssl command within a command prompt so that you know that it works ok. I think the command line you specified waits on stdin (well it does for me).
After that.....
runtime.exec creates a Process object. If you do this:
Process openssl = runtime.exec("....")
then you can examine the return code from openssl to see the exit code - for instance if the input file does not exist then exit = 1. You can test for this with Java
Alternatively you could get the stderr from the process and look inside it - if it is 0 length then all is good, if it has some text in there then it has likely failed. You could then throw an exception and include the stderr output in the exception messgae. You may need to experiment with this, runnig it first when openssl is happy then running it again when openssl is upset.
M

Host command not working properly

Hi,
I am using oracle forms 10.1.2.0.2.
In my form, I need to call a unix shell script.
{ Oracle forms will run on application server.
Unix will run in a development server.
(Both the servers are different)
From forms, if I click a button, it should call the unix shell script in a specified path.
Internally, the unix script will call oracle to generate a file.
In the file, some manipulations are done using unix.
After doing some manipulations, the file is stored in a specified path in the unix box. }
To achieve the above, I did the below things.
To execute a unix shell script from my oracle forms (10g),
1) the below configuration i added in the webutil.cfg file
install.syslib.0.user.1=ffisamp.dll|40960|1.0|true
transfer.database.enabled=TRUE
transfer.appsrv.enabled=TRUE
transfer.appsrv.workAreaRoot=c:\temp
transfer.appsrv.accessControl=TRUE
#List transfer.appsrv.read.<n> directories
transfer.appsrv.read.1=c:\temp
#List transfer.appsrv.write.<n> directories
transfer.appsrv.write.1=c:\temp
2) I have attached webutil.pll library to my form
3) I have subclassed object group from webutil.olb to my form.
4) The host command i used is (these code are present in when-button-pressed trigger of a button)
host('rsh selvas -l administrator sh <foldername>/if_csv.ksh',NO_SCREEN);
if form_failure then
     emessage('hi selva');
emessage(SQLERRM);
else
     emessage('failure selva');
end if;
when I click the button, I am getting the below messages,
hi selva
normal, successful completion
Also, the script is not executing and it is not giving me the desired result.
Can any one help me, where I am missing.
Thanks,
Selvaraj

hi steve,
Thanks for your response
after the host command i added like this
host.....;
pause;
if form_failure then
     emessage('hi selva');
else
     emessage('failure selva');
end if;
when I executed,
I got the below messages
PLEASE ACKNOWLEDGE
-- when i clicked ok,
it showed me failure selva
but still the shell script has not executed.
Note:
In /tmp directory, no log files are available.
Can you plz help
thanks,
selvaraj

Calling SQL Loader using HOST command from Developer Forms 4.5

I want to execute a set of code from D2K Forms 4.5 which has interfface with Client - OS ( In my case Windows NT/XP). I want to execute SQL Loader from Forms using Host Command and then after completion of that process, I want to do next transcations ( depending upond success of HOST/SQL Loader).
How to achive this?
I tried writing code like this ...
l_vc_command := 'sqlldr73'
                    ||' USERID='||l_vc_username||'/'||l_vc_password||'@'||l_vc_connect_string
                    ||' CONTROL='||l_vc_filepath||'Upload.ctl'
                    ||' DATA='||LTRIM(RTRIM(l_vc_fileloc))
                    ||' LOG='||l_vc_filepath|| l_vc_log_file || '_' || l_dt_sysdate_str ||'.log'
                    ||' BAD='||l_vc_filepath|| l_vc_bad_file || '_' || l_dt_sysdate_str ||'.bad'
                    ||' DISCARD='||l_vc_filepath|| l_vc_discard_file || '_' || l_dt_sysdate_str ||'.dsc';
HOST(l_vc_command,NO_PROMPT);
After this command i want to do some other code execution. so even if it fails or success, next code is executed. How to control this?
Please help..
Regards,
Milind

Forms6i running on W2000, Rdbms 8.1.7
in Forms I added a button TEST,
Trigger when-button-pressed : host('test.bat') ;
in directory .......\frm I added file test.bat :
REM ===============
cd /d C:\........\ldr
pause
sqlldr parfile=test.par
pause
type test.log
pause
exit
REM ================
now, pressing TEST button opens DOS window, telling me what's going on, running sqlldr, finally going back to forms
Are you using NO_PROMPT or NO_SCREEN option of HOST command ?
Had a look at Forms 4.5 manuals, there is no mentioning of (a)synchronously operation in connection with HOST command.

Calling SQL Loader from Forms 4.5 using HOST command in Win2000

One of my forms calls SQL Loader 7.3 using HOST command to load a csv file onto the database(Oracle 7.3) under Windows 2000 platform.
Only after sql loader finishes its operation the control should come to my form i.e. synchronous execution.
As of now its running asynchronously.
Is there any way to make it synchronous. If Not any other work arounds?
Environment Details
Forms [32 Bit] Version 4.5.10.6.0 (Production)
Windows 2000 Operating System
Oracle7 Release 7.3.2.3.2

Forms6i running on W2000, Rdbms 8.1.7
in Forms I added a button TEST,
Trigger when-button-pressed : host('test.bat') ;
in directory .......\frm I added file test.bat :
REM ===============
cd /d C:\........\ldr
pause
sqlldr parfile=test.par
pause
type test.log
pause
exit
REM ================
now, pressing TEST button opens DOS window, telling me what's going on, running sqlldr, finally going back to forms
Are you using NO_PROMPT or NO_SCREEN option of HOST command ?
Had a look at Forms 4.5 manuals, there is no mentioning of (a)synchronously operation in connection with HOST command.

Forms HOST command on WebLogic not working.

I am attempting to issue a HOST command from Forms 11g on a WebLogic Application Server (running on Solaris) to execute a server-side shell script.
I previously had no problem doing this using OAS10g (also running on Solaris), but all attempts on WebLogic set FORM_FAILURE to TRUE, and I do not know how to trace the error or cause of the problem.
To recreate, create a simple Form with a Text Item (ITEM4) and Command Button (ITEM5).
When-Button-Pressed trigger on ITEM5 contains the following code:
HOST(:item4);
IF FORM_FAILURE THEN
message('Form Failure occurred');
END IF;Transfer to Form server, and compile.
Even supplying '/bin/ls' as a command produces the error message.
As I mentioned, this was previously working without a problem on OAS10g on Solaris, so I am unsure if WebLogic requires some sort of different Security or privileges to be specified for the Forms Application component.
Cheers,
Marc.
Edited (code formatted) by: sirmarc on Oct 11, 2011 4:41 PM

The problem is most often caused as a result of not having the necessary environment variables available to execute the command in question. When the shell is launched using HOST, most of the typical variables are stripped. Specifically PATH and LD_LIBRARY_PATH. As a result, you need to create your own script to call and not call the command directly. The script would include the setting of the necessary environment variable before calling the wanted command.
You can try adding the needed variables to the default.env. In many cases, these will be picked up, it will just depend on exactly what it is you are trying to execute. So for example in default.env add to the existing PATH entry something like this or whatever is appropriate for your system> /usr/bin:/usr/ucb:/etc:.
Do not delete any of the existing entries in default.env and most importantly, do not use variable references. You must fully qualify your entries. Variables like $PATH are not permitted.

Host command on linux with forms 10g

Dear Experts
i have one major problem as i have made a form in forms 10g to upload .dmp files copied in application server my problem is that when i excute host command like bellow
cmdln := './imp.sh'
host(cmdln)
to excute and run shell script saved on application server which runs an imp command to upload all files copied in specified location but nothing is happening when i click on button as these command are fired on when button click trigger plzzz help its urgent
were i can make mistake

Whoa...please don't use txt speak when posting here; it is very hard to read and right now it took me about 5 minutes to understand what you have written. Please write proper sentences; help us to help you ; )
It is a good idea to have exact the same verison of exp / imp then your database version; Forms 10.1.2.0.2 would be compatible with a 10.1 database. If your database is e.g. 10.2 you'd need to install the 10.2 client software on your application server anyway. You wouldn't need to care about this when using datapump.
And another thing regarding datapump: conventional export is deprecated in 11.2 so one day or another your customers will need to move to datapump; the sooner the better.
As said: try to run your script on the shell without forms and see if this works. You would see error messages generated by your shell script too.
cheers
Edited by: christian erlinger on 19.05.2011 01:14
that damn smileys don't work anymore

Forms HOST command no longer works after database upgrade from 10g to 11g

Hi,
After upgrading the database 10g to 11g the forms HOST command no longer works on Unix server. The form used to work fine prior the upgrade. I read all the threads I could find and did not see any solutions. Adding PATH and LD_LIBRARY_PATH does not work because it does not even run a basic shell script. (I saw this solution, adding PATH and LD_LIBRARY_PATH, in many questions / threads).
1. I wouldn't expect the database upgrade to be an issue, but it is the only change we had.
2. Note, 11g is Oracle Fusion Middleware which is quite a bit different than 10g.
I even tried the most basic commands like "echo" which is a build-in Unix command and there is no directory for it (ie. no /usr/bin - so variable PATH is irrelvent). i.e HOST('echo hi'); and HOST('echo "hi" '); and even HOST ('echo hi > /my_file.txt'); all returns FORMS_FAILURE (actually the if is IF FORM_SUCCESS THEN ... else ... and the else part always runs now - whereas it didn't before.).
Or basic commands like /usr/bin/ls as in HOST(/usr/bin/ls). At that point I was just testing the Unix command would return FORM_SUCCESS even though I could not see the results (because they weren't writing to a log file). Notice that I'm using the direct path /usr/bin so no Unix environment variables were needed.
The form does use webutil but that part works. For example, we have webutil_file_transfer( ....) The file shows up on the application server and in the expected directory.
Here's the main goal. Upload a file from clients local PC to the datebase server. The form uploads the file to the Application server, then we have a Unix script to scp (secure copy) the file from the application server to the database server. IF webutil, or any other Oracle functions could put the file on the database server that would be better. But, I don't know of any procedures that do that - or would have done it cleanly (i.e. storing to database and write back to server and then using a blob etc. )
Anyway, I was hoping someone would help with either of these.
1) Get the HOST command to work. - If we can get that to work then I wouldn't need any more help. We can just call the already existing Unix script to copy the file from the application server to the database.
2) OR be able to upload directly to the database server - wanted to do that originally
Any help would be appreciated

Solution for those interested and for anyone else searching this forum for a solution
I found this on My Oracle Support:
<h3>Host Command from Forms Not Working in 11g in Sun Solaris Sparc OS [ID 1157346.1]</h3>
Applies To: Oracle Forms - Version 11.1.1.1.0 and later
Sun SPARC Sun OS
Symptoms:
When trying to execute a Shell script or any OS command using the host() Built-in from Forms 11g, the host()command is not getting executed. The same functionality works on other operating systems and in previous versions like 10gR2.
Steps to be followed:
1) Take a backup and edit the $DOMAIN_HOME/config/fmwconfig/servers/WLS_FORMS/applications/formsapp_11.1.1/config/default.env or any custom environment file.
2) Locate the following environment variable:
LD_PRELOAD=/ora10gas/app/11.1.0/Middleware/as_1/jdk/jre/lib/sparcv9/libjsig.so
3) Comment out this variable. After the changes, it will look like the following:
#LD_PRELOAD=/ora10gas/app/11.1.0/Middleware/as_1/jdk/jre/lib/sparcv9/libjsig.so
3) a) Instead of LD_PRELOAD, kindly use LD_PRELOAD_64 as given below :
LD_PRELOAD_64=/ora10gas/app/11.1.0/Middleware/as_1/jdk/jre/lib/sparcv9/libjsig.so
(This makes HOST AND RUN_REPORT_OBJECT work fine).
4) Save the file and execute your forms. The Host() built-in will work as expected
The LD_PRELOAD setting in default.env is only required for the working of signal chaining facility in JVM version 1.5 and later. If you are not using theSignal chaining facility, this variable is not required. For more information, refer to the following documentation
http://download.oracle.com/docs/cd/E14571_01/doc.1111/e14772/forms.htm#CJAJGAFF

Host command is not working on linux

Hi
I m using linux for application server n windows for client. I need to create folder from client machine by cliking a button of forms10g runtime.HOST command is not working which was working fine in windows.
Any help is appriciateable.
kazi mokarem

Hi
I had the same issue on linux a few weeks back. What tuned out was, when you install the Oracle app svr it does not include the system paths by default.
The path where mkdir is located may not be visible to the app.
Try to hardcode the path for mkdir as /bin/mkdir .... and seee if that works.
If the above statement works then add that path in the paths variable in default.env file located in $ORACLE_HOME/forms/server directory
HTH
Arvind

Host command in forms 10g

hi all
i am using host command in forms 10g. but it is not executing .
is there any distinct syntax or pre-requirement for executing this command
kindly help
thanks

i am using the following code create a text file in root directory.
the textfile should contain the list of folders,files present in the root directory.
XCMD:=NULL;
XCMD:='CD\' ;
CLIENT_HOST('CMD /C' || XCMD);
XCMD:='dir >C:foldnm.txt' ;
CLIENT_HOST('CMD /C '|| XCMD);
but the file is creating in the specific users directory. ie.
\ documents and settings\username\desktop
kindly help

HOST command not working in forms 10g

Hi,
I have migrated forms 6i to forms 10g, and having a requirement to open sqlplus prompt using a form menu. I have used the below command: -
"host('sqlplus '||user_name||'/'||pass||'@'||sid, no_screen);"
But I am not able to get the sqlplus window, and the main form is still in process for long time, till i bounce the server.
The forms are deployed on Oracle Applications Server 10g and i want to run it on server side.
Please help me with the problem.
Thanks,
Ankit

The deployment architecture is different between forms 10g and forms 6i.
In Forms 6i HOST built-in command will run on the client machine since you are running as client/server, but in WebForms (Forms10g) the HOST built-in command will run on the middle tier which is your application server machine.
In order to run hosts commands in WebForms you need to use webutil and use CLIENT_HOST in the webutil.
check the [Forms 10g R2 Demo|http://download.oracle.com/otndocs/demos/Forms_Demos_10gr2.zip] for sample codes of webutil.
You are using NO_SCREEN in your example, this will hide the window.
Tony
Edited by: Tony Garabedian on Nov 26, 2009 2:43 PM

Use Host command in Oracle forms 6i

hi
all
i use Oracle forms 6i i run in a web and in that i have connect one server so,
i have to use Host Command and i have to fire this command
host (' net use \\windchillsvr\e\jyotionline /user:dwg_users dwg_users');
But it's Not Connect
My Forms in run in Web
so help

JavaBean does d othe job for you but it requires signing process; I used it when I was working on forms6i for our project.
I could use another approach that is the file type command executable which it stays in client's PC to do it and it does not requires signing at all since I am now working on the Java EE project for downloading and launching the third party tool in client's PC.
I plan to write a article for forms use, which could do all the heavy WebUtil can do, but not need to go thru the signing process.

Host Command in a trigger

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