Java中的MySQL转储不起作用

Question

i am trying this command in java

executeCmd = DBConfig.dbLocation + "\\mysqldump -u " + mysqlUser +
    " -p"+DBConfig.dbPass + " " + DBConfig.dbName + 
    " -r -opt>supervisorDbBkup.sql";

Its giving me code 1 instead of 0

            String executeCmd = "";
    executeCmd = DBConfig.dbLocation+"\\mysqldump -u"+mysqlUser+
            " -p"+DBConfig.dbPass+" "+DBConfig.dbName+" -r -opt>supervisorDbBkup.sql";

    Process runtimeProcess =Runtime.getRuntime().exec(executeCmd);
    int processComplete = runtimeProcess.waitFor();
    if(processComplete == 0){
        return "Backup taken successfully";
    } else {
        return "Could not take mysql backup";
    }

this is the command which i am running :

                E:\program file\MySQL\MySQL Server 5.5\bin\mysqldump -uroot -p0502 dashboardsupervisor -r -opt>supervisorDbBkup.sql

any idea

Answer 1

What you need to do is to print out the contents of executeCmd after you've built it, to see what it contains, with something like:

Console.Out.WriteLine (executeCmd);

If that command doesn't work at the command line exactly as you've constructed it, it's unlikely to work within your program. Copy and paste the command exactly as it's output and attempt to execute it from a cmd shell.

I suspect your problem lies with the path to the executable or one of the options.

If that's not the case, you need to watch out for redirection. Redirection is a shell feature which may not be available to the Runtime.exec() call. What you will find is that the redirection bit is being passed as a parameter to the mysqldump execuatble which won't understand it at all.

The usual way to do this is to call the shell itself with arguments telling it how to run the command and redirect properly, something like:

String[] cmd = {"/bin/sh", "-c", "/path/to/mysqldump blah blah >/tmp/tempout"};
Process p = Runtime.getRuntime().exec(cmd);

(or equivalent cmd /c for Windows).

That ensures that redirection is handled correctly (by the shell itself) and the mysqldump executable only gets the arguments it understands.

Answer 2

Try the following

executeCmd = "<Absolute Path to MYSQL>\bin" + "\\mysqldump -u " + mysqlUser +
    " -p"+DBConfig.dbPass + " " + DBConfig.dbName + 
    " -r --opt > supervisorDbBkup.sql";

UPDATE:

-opt is not an option for mysqldump following is

--opt

Answer 3

try with this command "C:\\Program Files\\MySQL\\MySQL Server 5.1\\bin\\mysqldump -u username -pPASS_WORD database_name -r backup.sql"

Mind the space between -u and username and -p and password(there should be no space between -p and password). It worked for me.