Question

I’m now working on Sample login application in which user can login with their username and password by pressing login button. If the user is new then he/she can also register by choosing username and password. And this registration part of application worked.

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My actual question is: How do I compare the user entered credentials with the one that stored in database.

I used SELECT query to select the username and pwd as this

public void ValidateLogin(String un, String pwd)
     {
        SELECT_FROM = "SELECT u_name, u_pwd FROM" + table_name + "WHERE u_name == " + un + "AND u_pwd ==" + pwd;
        db.execSQL(SELECT_FROM);
     }

where username(un) and password(pwd) comes from another java file login.java.

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Now please tell me how would I make a successful transition to viewprofile page after successful login?

Answer 1

You can use `cursor` with `rawquery` to validate username and password in one boolean type of method

    public boolean ValidateLogin(String un, String pwd)
      {
        boolean chklogin=false;      
        c = db.rawQuery("SELECT u_name, u_pwd FROM " + table_name + " WHERE u_name = '"+ un + "' AND u_pwd ='"+ pwd + "'", null);

         if(c==null)
        {
            //set boolean var to false
               chklogin=false; 
           //message no such records 
         }

        else
         {
           //set boolean var to true 
               chklogin=true;
               c.moveToFirst(); 
         }

         return chklogin; //boolean var
}