execute sql script using java

Question

I want to execute sql script using java Java program is:

import java.io.*;
public class script{

public static void main(String argv[]) {

try {
  String line;
  Process p = Runtime.getRuntime().exec ("psql -U mit -d d980 -h tpeux250.sgp.st.com -f C:/java program/script.sql");
  BufferedReader input =new BufferedReader(new InputStreamReader(p.getInputStream()));

  while ((line = input.readLine()) != null) {        
    System.out.println(line);
  }
  input.close();
} catch (Exception err) {
  err.printStackTrace();
}

}

but i am getting the following errors

java.io.IOException:Cannot run program "psql": CreateProcess error=2, The system cannot find the file specified
       at java.lang.ProcessBuilder.start<Unknown Source>
       at java.lang.Runtime.exec<Unknown Source>
       at java.lang.Runtime.exec<Unknown Source>
       at java.lang.Runtime.exec<Unknown Source>
       at script.main<script.java:8>

Answer 1

The location where the actual psql binary is isn't on your PATH environment variable.

To verify run the following command from your terminal.

echo %PATH%

If the psql bin directory is missing, add it to your path as follows

set PATH = %PATH%;"C:\Program Files\PostgreSQL\9.2\bin"

and try to run your psql script from the terminal again. If that solves your problem, add the bin directory permanently (you'd have to since your Java program is sort of running in a different terminal)

My Computer > Properties > Advanced system settings (in the left pane). Select Environment Variables at the bottom and modify PATH to add your psql "bin" directory after a ";" at the end.

Answer 2

Before you run your command from java try executing it in the terminal. I see C:/java program and hoping it is Windows go to run(windows+R) and execute cmd . In the terminal try executing your command. In windows try back slash instead of forward slash

C:\>cd "c:\Program Files"

is successful whereas

 C:\Program Files>cd "c:/Program Files"
    The system cannot find the path specified.

is not. So use C:\\java program\\script.sql

Answer 3

用这个

Process p = Runtime.getRuntime().exec ("cmd.exe /c psql -U mit -d d980 -h tpeux250.sgp.st.com -f C:/java program/script.sql");