如何使用java備份和恢復mysql數據庫

Question

我有一個小應用程序，我將用它來備份和恢復一個mysql數據庫，編碼備份如下，它工作正常，

....
String command = "mysqldump --host=" + dataBase.getHost() + " --user=" + dataBase.getUserName() + " --password=" + dataBase.getPassword() + " "
                + dataBase.getDatabaseName() + " -r " + dataBase.getBackupPath() + "/ofm_mnu_backup_" + bkDate + ".sql";
        System.out.println(command);
        Process p = null;
        try {


            Runtime runtime = Runtime.getRuntime();
            p = runtime.exec(command);

            int processComplete = p.waitFor();

            if (processComplete == 0) {

                System.out.println("Backup created successfully");

            } else {
                System.out.println("Could not create the backup");
            }
....

但是當我嘗試使用以下代碼恢復數據庫時它無法正常工作，請幫助

  ........
    String command = "mysqldump --host=" + dataBase.getHost() + " --user="+dataBase.getUserName() + " --password= " + dataBase.getPassword()+""+dataBase.getDatabaseName() + "  " + dataBase.getBackupPath();
        Process p = null;

        try {
            System.out.println(command);
            Runtime runtime = Runtime.getRuntime();
            p = runtime.exec(command);
            int processComplete = p.waitFor();

            if (processComplete == 0) {
                System.out.println("Backup restored successfully");

            } else {
                System.out.println("Could not restore the backup");
            }
     ......

---

經過這么多谷歌搜索，我找到了答案，

  ......
  String[] executeCmd = new String[]{"mysql", [database], "--user=" + [username],"--password=" + [password], "-e", " source " + [absolute path to the sql file]};
  p = Runtime.getRuntime().exec(executeCmd);
  int processComplete = p.waitFor();
  ......

在上面的代碼中最重要的是**“source”+ [sql文件的絕對路徑] **'source'字和文件路徑之間不應該有逗號。

這對我有用，我希望它對你們也有用。

Answer 1

我不認為你正在使用mysqldump命令。 你不應該使用<或>字符來表示備份/恢復嗎？ 這將在這里詳細討論。 像這樣備份：

String command = "mysqldump --host=" + dataBase.getHost() + " --user=" + dataBase.getUserName() + " --password=" + dataBase.getPassword() + " "
            + dataBase.getDatabaseName() + " > " + dataBase.getBackupPath() + "/ofm_mnu_backup_" + bkDate + ".sql";

並恢復：

String command = "mysqldump --host=" + dataBase.getHost() + " --user=" + dataBase.getUserName() + " --password=" + dataBase.getPassword() + " "
            + dataBase.getDatabaseName() + " < " + dataBase.getBackupPath() + "/ofm_mnu_backup_" + bkDate + ".sql";

Answer 2

我想感謝各位關於如何使用java代碼恢復mysql數據庫的支持。 由於這些代碼都不適用於我，但它給了我一個線索，讓它起作用。

以下是我的最終工作代碼。

String[] executeCmd = new String[]{"C:\\xampp\\mysql\\bin\\mysql.exe",mydb, "--user=" + dbUserName, "--password=" + dbPassword, "-e", " source " + source};

Answer 3

這真的有助於恢復

 String comando = "C:\\MySQL\\bin\\mysql.exe  --host=localhost --port=3306 --user=root --password=123 < D:\\back.sql";
File f = new File("restore.bat");
FileOutputStream fos = new FileOutputStream(f);
fos.write(comando.getBytes());
fos.close();
Process run = Runtime.getRuntime().exec("cmd /C start restore.bat ");  

並備份

  DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.forLanguageTag("ru"));
    java.util.Date currentDate = new java.util.Date();
    Process p = null;
    try {
        Runtime runtime = Runtime.getRuntime();
        p = runtime.exec("C:\\MySQL\\bin\\mysqldump.exe  --default-character-set=utf8 -uroot -p123 -c  -B shch2 -r " + "D:/" + dateFormat.format(currentDate) + "_backup" + ".sql");

//使用dbpass和dbname更改dbpass和dbname int processComplete = p.waitFor（）;

        if (processComplete == 0) {

            System.out.println("Backup created successfully!");

        } else {
            System.out.println("Could not create the backup");
        }


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

但是你需要傳達mysql.exe和mysqldump.exe的確切路徑

Answer 4

也許是因為分配給終端的輸出流...是否可以在cmd中運行mysqldump命令？ 例如

String command = "cmd /K mysqldump..."

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希望這可以幫助