Running mysqldump query from java code

Question

Hello,
I m making a program I want to take a backup of database on a click of a button for which i want to execute this query :
"mysqldump --user=root --password=root --opt dbname>c:\backup.sql"
and my code is :
String command = "cmd /c start";
String[] env = new String[]{"mysqldump","--user=root", "--password=root",
"--opt", "njitsurvey", "<", "c:\\backup_db.sql" };
File dir = new File("C:/Program Files/MySQL/MySQL Server 5.0/bin/");
Process p1 = Runtime.getRuntime().exec(command, env, dir);
My problem is my command is running and going in to the directory also but not running my query and i m not getting and error also
Edited by: purva on Aug 7, 2008 11:56 PM

Answer 1

You need to print the content of the process error stream ( p1.getErrorStream() ) . It would also be worth you while reading http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html .
Also, you seem to think that setting the working directory toFile dir = new File("C:/Program Files/MySQL/MySQL Server 5.0/bin/");makes this the directory from which 'mysqldum' is found. It is not. The directory containing the executable has to on the PATH. The working directory is where the process looks for and creates data files if the full path to the files is not provided.
Edited by: sabre150 on Aug 8, 2008 10:41 AM
Also, you seem to think that the 'env' is the command executed! It is not. It the set of environment variables. You need to put the whole of the command as the first argument.
Edited by: sabre150 on Aug 8, 2008 10:46 AM