Question

我想在mysql 5.6中备份数据库为此，我使用这种方法：

public boolean backupDB(String dbName, String dbUserName, String dbPassword, String path) {

        String executeCmd = "D://mysql-5.6.11-win32/bin/mysqldump -u " + dbUserName + " -p" + dbPassword
                + " --add-drop-database -B " + dbName + " -r " + path;
        Process runtimeProcess;
        try {

            runtimeProcess = Runtime.getRuntime().exec(executeCmd);
            // any error message?
            StreamGobbler errorGobbler = new StreamGobbler(runtimeProcess.getErrorStream(), "ERR");
            // any output?
            StreamGobbler outputGobbler = new StreamGobbler(runtimeProcess.getInputStream(), "OUT");
            // kick them off
            errorGobbler.start();
            outputGobbler.start();

            int processComplete = runtimeProcess.waitFor();

            if (processComplete == 0) {
                System.out.println("Backup created successfully");
                return true;
            } else {
                System.out.println("Could not create the backup");
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return false;
    }

StreamGobbler是将runtimeProcess.getErrorStream()和runtimeProcess.getInputStream()包装到BufferedReader中的线程。 BufferedReader仅使用readLine()方法逐行读取。这是我this article的提示。

我的问题是方法backupDB挂起在这一行：

int processComplete = runtimeProcess.waitFor();

如果我用exitValue替换waitFor方法，我收到错误

java.lang.IllegalThreadStateException: process has not exited

因此我必须使用waitFor方法。不幸的是它永远运行。我必须在eclipse控制台上按红色图标才能停止JVM。

如何使进程完成并备份mysql数据库？这解决了谢谢！

编辑要启动mysqldump.exe，我需要编写完整路径：

String executeCmd = "D://mysql-5.6.11-win32/bin/mysqldump -u "

难道你不知道如何摆脱完整的道路。我想在计算机上的mysqldump.exe位置独立启动mysqldump。

也许有办法让mysqldump.exe的路径具有所有连接细节。

编辑如果我尝试使用没有mysqldump.exe完整路径的mysqldump，我会收到此异常：

java.io.IOException: Cannot run program "mysqldump": CreateProcess error=2, Íå óäàåòñÿ íàéòè óêàçàííûé ôàéë
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
    at java.lang.Runtime.exec(Runtime.java:615)
    at java.lang.Runtime.exec(Runtime.java:448)
    at java.lang.Runtime.exec(Runtime.java:345)
    at dbViewer.model.ConnectionManager.backupDB(ConnectionManager.java:273)
    at dbViewer.model.ConnectionManager.main(ConnectionManager.java:337)
Caused by: java.io.IOException: CreateProcess error=2, Íå óäàåòñÿ íàéòè óêàçàííûé ôàéë
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(ProcessImpl.java:189)
    at java.lang.ProcessImpl.start(ProcessImpl.java:133)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1021)
    ... 5 more

谢谢！

Answer 1

您只需使用mysqldump -p 选项：

mysqldump –u[user name] –p[password] [database name] > [dump file]

为什么java进程挂起执行mysqldump？

1 个答案: