topic Re: [resolved] How to get an environment variable from the system into a context var? in Talend Studio

[resolved] How to get an environment variable from the system into a context var?

Anonymous — Sat, 16 Nov 2024 13:44:28 GMT

I am looking to implement the following scenario:
Setup a system environment variable on the server that Talend is running on. The value of this variable will be a path to a folder containing XML files that I use for various purposes. At runtime in my job, I would like to use some Talend component to retreive the value of the environment variable and store it in a context variable. I can then use that context variable as the leading source string for my tXMLInput.
I see a tSetEnv, but I do not see a tGetEnv comnponent.
Any easy way to do this?
thanks,
Dave

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Wed, 07 Oct 2009 14:38:25 GMT

Hi;
To retrieve your environment variable use the following into a tJava (begin of your Job) like this : context.MyPath = System.getProperty("SYSTEM_ENV");
Best regards;

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Wed, 07 Oct 2009 18:07:49 GMT

Hi;
To retrieve your environment variable use the following into a tJava (begin of your Job) like this : context.MyPath = System.getProperty("SYSTEM_ENV");
Best regards;

Thanks! Sounds like tSetEnv needs a brother (tGetEnv)
Dave

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Wed, 18 Nov 2009 18:59:18 GMT

Hi;
To retrieve your environment variable use the following into a tJava (begin of your Job) like this : context.MyPath = System.getProperty("SYSTEM_ENV");
Best regards;

Thanks! Sounds like tSetEnv needs a brother (tGetEnv)
Dave
In the following code, the commented out line works, but sun java documentation says that getenv is deprecated. The uncommented line (getProperty) only works when I query for java.xxx properties (ex: java.io.tmpdir), but returns null when I use system environment vars. System.getProperty() is a java function.

Also, I assume that this same command can be used against linux?

context.CCRHome = System.getProperty("CCR_HOME");
//context.CCRHome = System.getenv("CCR_HOME");

???
Dave

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Thu, 19 Nov 2009 03:32:55 GMT

Hello Dave
Please use the following routine, it both works on windows and Unix/Linux.

// template routine Java
package routines;
import java.io.*;
import java.util.*;
public class getEnv {
	static String value = null;
	public static String getEnvValue(String key) {
		try {
			Properties p = getEnv.getEnvVars();
			value = p.getProperty(key);
		} catch (Throwable e) {
			e.printStackTrace();
		}
		return value;
	}
	public static Properties getEnvVars() throws Throwable {
		Process p = null;
		Properties envVars = new Properties();
		Runtime r = Runtime.getRuntime();
		String OS = System.getProperty("os.name").toLowerCase();
		if (OS.indexOf("windows 9") > -1) {
			p = r.exec("command.com /c set");
		} else if ((OS.indexOf("nt") > -1) || (OS.indexOf("windows 2000") > -1)
				|| (OS.indexOf("windows xp") > -1)) {
			p = r.exec("cmd.exe /c set");
		} else {
			// it is Unix os.
			p = r.exec("env");
		}
		BufferedReader br = new BufferedReader(new InputStreamReader(p
				.getInputStream()));
		String line;
		while ((line = br.readLine()) != null) {
			int idx = line.indexOf('=');
			String key = line.substring(0, idx);
			String value = line.substring(idx + 1);
			envVars.setProperty(key, value);
		}
		return envVars;
	}
}

Best regards

shong

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Thu, 19 Nov 2009 15:51:07 GMT

Hello Dave
Please use the following routine, it both works on windows and Unix/Linux.

// template routine Java
package routines;
import java.io.*;
import java.util.*;
public class getEnv {
	static String value = null;
	public static String getEnvValue(String key) {
		try {
			Properties p = getEnv.getEnvVars();
			value = p.getProperty(key);
		} catch (Throwable e) {
			e.printStackTrace();
		}
		return value;
	}
	public static Properties getEnvVars() throws Throwable {
		Process p = null;
		Properties envVars = new Properties();
		Runtime r = Runtime.getRuntime();
		String OS = System.getProperty("os.name").toLowerCase();
		if (OS.indexOf("windows 9") > -1) {
			p = r.exec("command.com /c set");
		} else if ((OS.indexOf("nt") > -1) || (OS.indexOf("windows 2000") > -1)
				|| (OS.indexOf("windows xp") > -1)) {
			p = r.exec("cmd.exe /c set");
		} else {
			// it is Unix os.
			p = r.exec("env");
		}
		BufferedReader br = new BufferedReader(new InputStreamReader(p
				.getInputStream()));
		String line;
		while ((line = br.readLine()) != null) {
			int idx = line.indexOf('=');
			String key = line.substring(0, idx);
			String value = line.substring(idx + 1);
			envVars.setProperty(key, value);
		}
		return envVars;
	}
}

Best regards

shong

Thanks shong.

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Fri, 20 Nov 2009 16:05:39 GMT

Hello Dave
Please use the following routine, it both works on windows and Unix/Linux.

// template routine Java
package routines;
import java.io.*;
import java.util.*;
public class getEnv {
	static String value = null;
	public static String getEnvValue(String key) {
		try {
			Properties p = getEnv.getEnvVars();
			value = p.getProperty(key);
		} catch (Throwable e) {
			e.printStackTrace();
		}
		return value;
	}
	public static Properties getEnvVars() throws Throwable {
		Process p = null;
		Properties envVars = new Properties();
		Runtime r = Runtime.getRuntime();
		String OS = System.getProperty("os.name").toLowerCase();
		if (OS.indexOf("windows 9") > -1) {
			p = r.exec("command.com /c set");
		} else if ((OS.indexOf("nt") > -1) || (OS.indexOf("windows 2000") > -1)
				|| (OS.indexOf("windows xp") > -1)) {
			p = r.exec("cmd.exe /c set");
		} else {
			// it is Unix os.
			p = r.exec("env");
		}
		BufferedReader br = new BufferedReader(new InputStreamReader(p
				.getInputStream()));
		String line;
		while ((line = br.readLine()) != null) {
			int idx = line.indexOf('=');
			String key = line.substring(0, idx);
			String value = line.substring(idx + 1);
			envVars.setProperty(key, value);
		}
		return envVars;
	}
}

Best regards

shong

Thanks - I ended up using getEnv("CCR_HOME") in java, and that worked fine.

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Sun, 22 Nov 2009 17:22:08 GMT

You can simply use System.getenv("myvar") in java, without an external code.
bye

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Mon, 30 Nov 2009 16:08:25 GMT

right - that worked great.
Thanks,
Dave

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Thu, 17 Dec 2009 19:17:10 GMT

Shong,
Nice solution. Thanks!

Re: [resolved] How to get an environment variable from the system into a context var?

Anonymous — Mon, 22 Feb 2016 14:24:12 GMT

There is a custom component for this in Talend Exchange - tGetEnvVarInput