從Java備份MySQL時出錯

Question

我已經開發了一個Java應用程序，它已經處於最后階段。

問題是我無法使用Runtime.getRuntime().exec()執行mysqldump。

try {
    String[] command = new String[] {
        "cmd.exe",
        "/c",
        "mysqldump --host=" + host + " --user=" + dbuser + " --password=" + dbpass + " " + dbname + " > " + filename
    };
    Process runtimeProcess = Runtime.getRuntime().exec(command);
    int ProcessComplete = runtimeProcess.waitFor();
    if (ProcessComplete == 0) {
        JOptionPane.showMessageDialog(null, "Database backup has been done successfully");
    }
    else {
        JOptionPane.showMessageDialog(null, "Database backup was unsuccessfull");
        JOptionPane.showMessageDialog(null, command);
    }
}
catch (IOException | InterruptedException exc) {
    Logger.getLogger(Backup.class.getName()).log(Level.SEVERE, null, exc);
}

誰能幫我這個？

Answer 1

我在Windows中嘗試了您的代碼，對我來說效果很好。

打開cmd ，鍵入mysqldump然后按Enter。

如果執行成功，則意味着如果數據庫配置正確，則代碼應該可以正常工作。

如果您無法將'mysqldump' is not recognized as an internal or external command則必須在環境變量中設置MySQL路徑，或者在Java代碼中為mysqldump指定完整路徑，如下所示：

String[] command  = new String[] {
    "cmd.exe",
    "/c",
    "c://mysql/bin/mysqldump --host=" + host + " --user=" + dbuser + " --password=" + dbpass + " " + dbname + " > " + filename
};