Please help regarding method/function sign up validation with mysql jdbc.

Question

HI guys,
I am have been fixing this problem for days, hope that someone could help me find the bug on my code.
I have 3 files:
1.WithAuth.java - for database jdbc mysql connection
2.WithAuthMet.java - method that will read any variables that will be passed to it. this method is waiting for two variables, a and b. a for userName and b for userPassword.
3.WithAuthTest.java - the testing class, this is where i declare my sample control data to test the database connection and query.
here's the actual codes:
WithAuth.java
package com.Auth;
public class WithAuth {
    static String userName = "root";
    static String userPassword = "";
    static String databaseUrl = "jdbc:mysql://localhost:3306/javatowebservice";
    static String userQuery = "select * from userlogin";
}WithAuthMet.java
- this is where the error is and where I messed up.
package com.Auth;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class WithAuthMet extends WithAuth {
    public void connect(String a, String b)throws Exception{       
        //try {
            Class.forName ("com.mysql.jdbc.Driver").newInstance ();               
            Connection conn = DriverManager.getConnection (databaseUrl, userName, userPassword);
            Statement stat = conn.createStatement();   
            String query = userQuery;
            ResultSet result = stat.executeQuery(query);
            System.out.println("Result(s): ");
              while (result.next ()){
                  int i = result.getInt("userId");
                  String name=result.getString("userName");
                  String password=result.getString("userPassword");
                      //System.out.println("test data:"+a);
                  if(a.equals(name.equals("userName"))&& b.equals(password.equals("userPassword"))){
                            System.out.println("User is Valid");
                        else{
                            System.out.println("You are not a Valid User");
                            System.out.println("test data:"+name);
                            System.out.println("test data:"+password);
                            System.out.println("test data:"+a);
                            System.out.println("test data:"+b);
                  //conn.close();
               // }catch(Exception e){
                //System.out.println("Exception is ;"+e);
                //System.out.println("Exception is ;");
//                if(a.equals(name.("userName"))
//                    && password.equals(password.equals("userPassword"))){
//                    System.out.println("User is Valid");
//                else{
//                    System.out.println("You are not a Valid User");
} WithAuthTest.java
package com.Auth;
public class WithAuthTest extends WithAuthMet{
    public static void main(String[] args) throws Exception{
        WithAuthMet CTD = new WithAuthMet();   
        String a = "dan";
        String b = "password";
        //CTD.connect(String name,String password);
        CTD.connect(a, b);
        //return connect;
}please help.

Answer 1

yakultyakultyakult wrote:
WithAuthMet.java
- this is where the error is and where I messed up.
package com.Auth;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class WithAuthMet extends WithAuth {
public void connect(String a, String b)throws Exception{       
//try {
Class.forName ("com.mysql.jdbc.Driver").newInstance ();               
Connection conn = DriverManager.getConnection (databaseUrl, userName, userPassword);
Statement stat = conn.createStatement();   
String query = userQuery;
ResultSet result = stat.executeQuery(query);
System.out.println("Result(s): ");
while (result.next ()){
int i = result.getInt("userId");
String name=result.getString("userName");
String password=result.getString("userPassword");
//System.out.println("test data:"+a);
if(a.equals(name.equals("userName"))&& b.equals(password.equals("userPassword"))){
System.out.println("User is Valid");
else{
System.out.println("You are not a Valid User");
System.out.println("test data:"+name);
System.out.println("test data:"+password);
System.out.println("test data:"+a);
System.out.println("test data:"+b);
//conn.close();
// }catch(Exception e){
//System.out.println("Exception is ;"+e);
//System.out.println("Exception is ;");
//                if(a.equals(name.("userName"))
//                    && password.equals(password.equals("userPassword"))){
//                    System.out.println("User is Valid");
//                else{
//                    System.out.println("You are not a Valid User");
This is one line that is wrong
                   if(a.equals(name.equals("userName"))&& b.equals(password.equals("userPassword"))){You have 'a' and 'b which are Strings
and you are comparing them [using equals()] with the boolean return from another set of equals() invocations.
String equals boolean will always be false (well, maybe not if the String is "TRUE" or "FALSE" - and you would need some more boilerplate to make that work).