在Windows上的Java ProcessBuilder中执行MySQL命令。

Question

我试图从Java中执行一些MySQL命令 ProcessBuilder 在WINDOWS上，我遇到了一些问题。目前，我想做的是显示数据库，但在不久的将来，我将使用dump等。所以这是它应该是的方式。

这是我的代码。

try {

//  Process process = Runtime.getRuntime().exec("cmd /c C:/\"Program files\"/MySQL/\"MySQL Server 8.0\"/bin/mysql -uroot -pMYPASS -e \"show databases;\""); 
//  IT DIDN'T WORK EITHER.

    ProcessBuilder coolBuilder = new ProcessBuilder(new String[]{"cmd", "/c", "C://\"Program files\"/MySQL/\"MySQL Server 8.0\"/bin/mysql -u root -pMYPASS -e \"show databases;\""});
    Process process = coolBuilder.start();

    int errCode = process.waitFor();
    if (errCode != 0) {
        System.out.println("errCode = " + errCode);
        errorList.add(ErrorEnum.ERROR_OCCURED_WHILE_INSIDE_SHELL.toString());
    }

    for (String s : output(process.getErrorStream())) {
        if (!s.contains("Warning")) {
            errorList.add(s);
            return errorList;
        }
    }

    return output(process.getInputStream());

} catch (Exception e) {
    e.printStackTrace();
}

我得到的是这样的结果

C://Program files/MySQL/MySQL Server 8.0/bin/mysql  Ver 8.0.20 for Win64 on x86_64 (MySQL Community Server - GPL)
Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Usage: C://Program files/MySQL/MySQL Server 8.0/bin/mysql [OPTIONS] [database]
  -?, --help          Display this help and exit.
  -I, --help          Synonym for -?
  --auto-rehash       Enable automatic rehashing. One doesn't need to use
                      'rehash' to get table and field completion, but startup



...

errCode = 1

有什么建议说我做错了吗？

Answer 1

我无法重现你的问题。 我怀疑你的密码中可能有一个奇怪的字符，而Windows命令提示符并不热衷。

你是否尝试过执行 mysql 可执行文件，而不是通过 cmd.exe即使用类似下面的方法？

        ProcessBuilder coolBuilder = new ProcessBuilder(new String[]{"C://Program files/MySQL/MySQL Server 8.0/bin/mysql", "-u", "root", "-pMYPASS", "-e", "show databases;"});
        Process process = coolBuilder.start();

这样你就不需要引用所有的论点。