我已经在 phpadmin 中创建了一个名为 fbaccount 的表。我仍然不知道这有什么问题。任何帮助将不胜感激。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.ImageIcon.*;
import java.sql.*;
public class Fb extends JFrame{
Icon icon = new ImageIcon("images/signup.png");
Icon icon2 = new ImageIcon("images/login.jpg");
JLabel signupicon = new JLabel(icon);
JLabel loginicon = new JLabel(icon2);
JTextField user = new JTextField();
JTextField fname =new JTextField("First name");
JTextField lname = new JTextField("Last name");
JTextField email = new JTextField("Email");
JTextField remail = new JTextField("Re-enter email");
JTextField password =new JTextField("Password");
JPasswordField pass = new JPasswordField();
Container c = new Container();
Connection con;
Statement st;
ResultSet rs;
int ctr=0;
public Fb()//constuctor
{
this.setSize(947,486);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setResizable(false);
setContentPane(new JLabel(new ImageIcon("images/fb.jpg")));
c = this.getContentPane();
c.setLayout(null);
c.add(signupicon);
c.add(loginicon);
c.add(user);
c.add(pass);
c.add(fname);
c.add(lname);
c.add(email);
c.add(remail);
c.add(password);
loginicon.setBounds(875,18,48,21);
signupicon.setBounds(526,405,195,40);
user.setBounds(547,18,151,21);
pass.setBounds(710,18,151,21);
fname.setBounds(524,179,195,40);
lname.setBounds(729,179,195,40);
email.setBounds(524,229,400,40);
remail.setBounds(524,279,400,40);
password.setBounds(524,329,400,40);
}
//for sql codes
public void actionPerformed(ActionEvent e)
{
//for login
Object j= e.getSource();
if(j==loginicon){
String u = user.getText();
String p = pass.getText();
try{
String driver="com.mysql.jdbc.Driver";
String db="jdbc:mysql://localhost:3306/fbaccount";
String user="root";
String pass="";
Class.forName(driver);
con=DriverManager.getConnection(db,user,pass);
st=con.createStatement();
String QueryString = "SELECT username, password from fbaccount WHERE username = '"+u+"' AND password = '"+p+"' ";
rs = st.executeQuery(QueryString);
int count = 0;
while(rs.next()){
count = count +1;
}
if (count==1)
{
Opening ms = new Opening();
ms.setVisible(true);
dispose();
}
else if (count>1){
JOptionPane.showMessageDialog(this,"Can't Login");
}
else if (count==0)
JOptionPane.showMessageDialog(this,"No record Exist");
}catch(Exception ex){
JOptionPane.showMessageDialog(this, "Error in database connection");
ex.printStackTrace();
System.exit(0);
}
}
//for the signup
else if (j==signupicon)
{
String u = user.getText();
String p = pass.getText();
String nemail=email.getText();
String n= fname.getText();
String l= lname.getText();
try{
int updateQuery = 0;
String driver="com.mysql.jdbc.Driver";
String db="jdbc:mysql://localhost:3306/fbaccount";
String user="root";
String pass="";
Class.forName(driver);
con=DriverManager.getConnection(db,user,pass);
st=con.createStatement();
String QueryString = "SELECT username, password from fbaccount WHERE username = '"+u+"' ";
rs = st.executeQuery(QueryString);
int count = 0;
while(rs.next()){
count = count +1;
}
if (count>0)
{
JOptionPane.showMessageDialog(this,"Username already Exist");
}
else{
QueryString = "INSERT INTO fbaccount(lastname, firstname,username ,new_email,password) VALUES ('"+l+"','"+n+"','"+u+"' ,'"+nemail+"','"+p+"')";
updateQuery = st.executeUpdate(QueryString);
{
JOptionPane.showMessageDialog(this,"Account created successfully");
}
}
}
catch (Exception ex)
{
JOptionPane.showMessageDialog(this, "Unable to connect to database");
ex.printStackTrace();
System.exit(0);
}
}
}
public static void main(String[] args)
{
Fb f = new Fb();
f.setVisible(true);
}
}
我该怎么办?这是如何连接到mysql还是我错过了什么?