如何使用java备份和恢复mysql数据库 [英] how to backup and restore mysql database using java

问题描述

我有一个小应用程序，我将用它来备份和恢复一个mysql数据库，编码备份如下，它正常工作，

I have a small application which I am going to use to backup and restore a mysql database, coding for backup is as follows and it works properly,

....
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");
            }
....

但是当我尝试恢复数据库时使用以下代码不起作用，请帮助

But when I try to restore the database using following codes it is not working, please help

  ........
    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");
            }
     ......

---

经过如此多的谷歌搜索，我找到了答案，

---

After so many google searches I found the answer for my matter,

  ......
  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();
  ......

在上面的代码中最重要的是**源+ [sql文件的绝对路径] **'源'字和文件路径之间不应该有逗号。

In the above code most important thing is ** " source " + [absolute path to the sql file] ** there shouldn't be a comma between 'source' word and the file path.

这对我有用我希望它对你们也有用。

this worked for me I hope it'll work for you guys too.

推荐答案

我认为你没有使用 mysqldump 命令非常正确。您是否应该使用< 或> 字符来表示备份/恢复？详细讨论此处 。这样的东西要备份：

I don't think you are using the mysqldump command quite right. Shouldnt you use < or > characters to denote the backup/restore? This is discussed at length here. Something like this to backup:

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

并恢复：

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

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