How to verify username and password in Java-mysql?

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How do I verify in the most right way the username and password that were inputted by the user to the database?

In c++, we used to verify by using if-else:
    if((user == "username")&&(pass == "password")){
             cout<<"You are now logon!";
    }

In java-mysql I'm not sure if I'm on the right track:

Login Button

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:

        user = jTextField1.getText();
        pass = jPasswordField1.getPassword();
        login();
}

Method/function

private void login() {

        try {
                if (user != null) {
                sql = "Select * from users_table Where username='" + user + "'";
                rs = stmt.executeQuery(sql);

                rs.next();
                username = rs.getString("username");
                password = rs.getString("password");

            }
        } 
    catch (SQLException err) {
            JOptionPane.showMessageDialog(this, err.getMessage());
        }

}

If the username and password that inputted by the user matched with the ones in the database then he will be directed to a new jFrame else message dialog will popup saying invalid username or password. Can someone help me with my codes, I don't know how to use the if-else statement with mysql;

Thanks! :)


Implement the below code:

private void login() {
    try {
        if (user != null && pass != null) {
            String sql = "Select * from users_table Where username='" + user + "' and password='" + pass + "'";
            rs = stmt.executeQuery(sql);
            if (rs.next()) {
                //in this case enter when at least one result comes it means user is valid
            } else {
                //in this case enter when  result size is zero  it means user is invalid
            }
        }

        // You can also validate user by result size if its comes zero user is invalid else user is valid

    } catch (SQLException err) {
        JOptionPane.showMessageDialog(this, err.getMessage());
    }

}

How to find out the username and password for mysql database , How do I authenticate a username and password in Java? Firstly, select by username, then hash the user entered password en check if it matches the hashed password in the database. I suggest something like SHA-2 I also suggest you write classes to handle your code, i.e a User class..


Check username and password with MySQL, getConnection("jdbc:mysql://localhost:3306/JEREN","root","");. Second is check the user and pass variable is getting the value from the action  Hi im trying to create simple mysql java register login system.Actually i did it by watching youtube videos and its working but i couldnt implement username exist in db or not feature.I am posting full code here.


you don't have to do anything with mySQL anymore. You already have the credentials. One Example:

if ((user.equals(username)) && (pass.equals(password))) {
   JFrame newFrame = new JFrame();
} else {
   JOptionPane.showMessageDialog(null, "alert", "alert", JOptionPane.ERROR_MESSAGE); 
}

How to verify username and password in Java-mysql?, java username and password java program to fetch username and password from db and validate it java login form with mysql database connection in eclipse. If the ResultSet returns a row, the Username and Password have already been checked by the SQL statement. You do not need to check again. You do not need to check again. Additionally, you should put in place a system where the same Username can not be used more than once.


Use prepared statements along with a library like DButils which would simplify your work a lot.

In addition, don't use substitution pass parameters such as select name from members where code =?. If you have many parameters, create a array of objects and pass them in a object array such as Objects[] parms = {code1,code2}.

Java-Mysql How to check username already exist in database , import javamysql.model.User;. public interface ICrud {. boolean insert(User user);​. User getUser(String userName, String password);. }  learn how to get username and password from database using java netbeans Log-in using user name and password stored in the database. LIKE my Facebook Page: h


if (username.length()>0 && password.length()>0)
{
    String query = "Select * from adminlogin Where Username='" + username + "' and Password='" + password + "'";

    rs = sta.executeQuery(query);

   if (rs.next()) 
   {

        home hme=new home();
        this.setVisible(false);
        hme.setVisible(true);
   } 
   else 
   {
       JOptionPane.showMessageDialog(null,"username and password are wrong ");
   }
}
else
{
      JOptionPane.showMessageDialog(null,"please field username and password ");
}

Validate userid and password (JDBC and Relational Databases , I need to validate my user-id and password with servlet and jsp concept , iam using MySQL database. Iam new to development field, please  Easy tutorial on how to check if a value already exists in the database. Java & MySQL - Check if a value already exists Mozoran. How to Verify if Username Already Exists in JSP SERVLET


Login form validation in java, Hello friends in this video I have shown how you can validate username and password in java Duration: 6:50 Posted: Nov 18, 2018 Even though i am connected i still waould like to know what are my user name and password for a database. Do you know any way that i can find my username and my password. I would really appreciate any information for finding my username and password. Thank you


how to get Login username and password from sql database , learn how to get username and password from database using java netbeans Log-in using Duration: 8:50 Posted: Feb 26, 2016 Create a text file and place the following statements in it. Replace the password with the password that you want to use. UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root'; FLUSH PRIVILEGES; The UPDATE and FLUSH statements each must be written on a single line.


Username and password Java Tutorial, This code allows the user to input his user and password and it meets the if conditions.Duration: 7:41 Posted: Nov 10, 2015 the user enter his login and password and click on the login button, and all we have to do is to check if a user with this username and password already exists on the database, and if the user don't exists show a warning message , else show a new form with the user username displayed on a jlabel.