如何在Java中更新MongoDB的密码

Question

And having one difficulty as I tried to update the password of existing user in mongo from code-->

 public static byte[] getPassword(String value) {
    try {
        return MessageDigest.getInstance("SHA-512").digest(value.getBytes("UTF-8"));
    } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
        throw new RuntimeException(e);
    }
}

If I wants to read the data from table the I used -->

public static User findByUsernameAndPassword(String username, String password) {
    return users().findOne("{username: #, shaPassword: #}", username.toLowerCase(), getSha512(password)).as(User.class);
}

I tried to wrote the code for update like -->

public Update update() {
  return users().update("{shaPassword: #}",getPassword(password)); 
}

but from above query if I given the input like { "username" : "admin", "password": "password1" } From above input it is updating the password but if I chnage the name of username then it is creating the new user. I didn;t find the proper solution for it. please help me.

Answer 1

// create user
db.createRole({role:'sysadmin',roles:[], privileges:[{resource:{anyResource:true},actions:['anyAction']}]})
db.createUser({user: "root",  pwd: "abcd1234",  roles: [ { role: "sysadmin", db: "admin" } ] } );
db.system.users.find();

// modify passowrd
db.updateUser("root",  {pwd: "abcde12345"} );
db.system.users.find();