恢复mySQL数据库的运行时过程

Question

Similar to this link: " How to restore a MySQL database backup using Java "

I'm trying to restore a database using mysql.exe by executing the command through runtime processes. I've tried several commands but I can't seem to make it work. They all seem to hang and return an exit value of 1.

These are the commands I've tried:

    String executeCmd = mySQLDir+"\\bin\\mysql -u root --password= testdb < " + backupFile;
    String[] executeCmd = new String[]{mySQLDir+"\\bin\\mysql", "-u", "root", "--password=", "testdb", " < " + backupFile};
    String[] executeCmd = new String[]{mySQLDir+"\\bin\\mysql", "--user=root", "--password=" , "testdb -e", " source "+backupFile};  
    String executeCmd = mySQLDir+"\\bin\\mysql -u root --password= testdb -e source "+ backupFile;

I've tried to output what trying to happen during the execution through input stream and this occurs prints out (There's a lot more text but the first two lines are this):

C:\xampp\mysql\bin\mysql  Ver 15.1 Distrib 10.1.9-MariaDB, for Win32 (AMD64)
Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

Usage: C:\xampp\mysql\bin\mysql [OPTIONS] [database]

So from what I'm understanding it doesn't seem to recognize the commands through java, but doing it through command prompt seems to work. Any ideas?

Edit: A user mentioned that command might be incorrect so heres the output to the third executeCommand:

C:\xampp\mysql\bin\mysql
--user=root
--password=
testdb -e
source C:\Users\AA\Documents\NetBeansProjects\TestProject\backup\testDBBackup69-03-2016%19-27-45.sql

I tried playing around with spaces in second command :

String[] executeCmd = new String[]{mySQLDir+"\\bin\\mysql", " -u ", "root", " --password=", " testdb ", "< " + backupFile};

result in using system.print output:

C:\xampp\mysql\bin\mysql -u root --password= test < C:\Users\AA\Documents\NetBeansProjects\TestProject\backup\testDBBackup69-03-2016%19-27-45.sql

I know this command works for sure in cmd but still doesn't work in java

I have solved the issue, answer is below.

Answer 1

You can't get redirection unless you start a shell. An exe won't understand < .

Put "cmd", "/c" into the front of the String[] array.

Answer 2

I've solved this issue by using Process Builder class instead.

Example code:

        String[] command = new String[]{mySQLDir+"\\bin\\mysql ", "-uroot", "--password=", "testdb"};
        ProcessBuilder processBuilder = new ProcessBuilder(command);
        processBuilder = new ProcessBuilder(Arrays.asList(command));
        processBuilder.redirectError(Redirect.INHERIT);
        processBuilder.redirectInput(Redirect.from(backupFile));
        Process process = processBuilder.start();
        process.waitFor();