Question

我尝试使用以下代码备份mysql数据库。

    public boolean backupDB() {

    String executeCmd = "mysqldump -u root -p 1234 --add-drop-database -B test -r D:\\backup\\aaa.sql";
    Process runtimeProcess;
    try {
        runtimeProcess = Runtime.getRuntime().exec(executeCmd);
        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;
}

但它总是给我这个错误：

CreateProcess error=2, The system cannot find the file specified

我该如何解决这个问题？感谢

Answer 1

修改PATH外部变量以包含mysqldump.exe的路径或使用文件的绝对路径。

set PATH=%PATH%;%MYSQL_HOME%\bin

其中MYSQL_HOME是一个包含MySQL服务器安装文件夹路径的变量。

使用绝对路径时。请注意，此路径取决于您的comp，不应在生产代码中使用。

String executeCmd = "C:\\Programs Files\\MySQL\\MySQL Server 5.0\\bin\\mysqldump.exe -u root -p 1234 --add-drop-database -B test -r D:\\backup\\aaa.sql";

Answer 2

在使用mysqldump之前，请指定其路径：

String executeCmd = "\""+mysqldump_path+"bin\\mysqldump.exe\" --host=localhost --port=3306 --user=root --password=pass database > \""+path+"\"";
 runtimeProcess = Runtime.getRuntime().exec(new String[]{"cmd.exe","/c",executeCmd});

       int processComplete = runtimeProcess.waitFor();
       System.out.println(processComplete);

       if(processComplete == 0) {
           JOptionPane.showMessageDialog(null, "Backup Created Successfully !");
           System.out.println("Backup Created Successfully !");
       }
       else{
          System.out.println("Couldn't Create the backup !");
          JOptionPane.showMessageDialog(null, "Couldn't Create the backup !");
       }

如果它创建错误并且异常，那么这可以添加一段代码以查看错误：

InputStream errorStream = runtimeProcess.getErrorStream();
byte[] buffer = new byte[errorStream.available()];
errorStream.read(buffer);
String str = new String(buffer);
System.out.println(str);

使用mysqldump进行mysql数据库备份

2 个答案: