我对JAVA很新，所以这可能是一个简单的解决方案。
我正在设计一个使用数据库中不同用户的登录系统。
它们与数据库中的“是”列分开。
它目前使用IF语句登录管理员但在此处停止使用，并且在使用工作人员的凭证时不会登录。
signIn.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
try{
Class.forName(DRIVER);
// Connection to the Database
con = DriverManager.getConnection(DATABASE_URL,"root","");
// Gets text from textfields and assigns them to variables
s1 = tfUsername.getText();
s2 = tfPassword.getText();
Statement st = con.createStatement();
// SQL Statements
st.executeQuery("SELECT * FROM login WHERE UName= '"+s1+"' and PWord = '"+s2+"'");
// Extracts data from statement to a result set
ResultSet rs = st.getResultSet();
if (rs.next())
{
String Username = rs.getString("UName");
String Password = rs.getString("PWord");
String staff = rs.getString("Staff");
String management = rs.getString("Management");
if(Username.equals(s1) & Password.equals(s2) & management.equals("Yes"))
{
JOptionPane.showMessageDialog(null, "Login Successful, Hello " + s1 );
ManagerDashboard.main(args);
signInFrame.setVisible(false);
}
if(Username.equals(s1) & Password.equals (s2) & staff.equals("Yes"))
{
JOptionPane.showMessageDialog(null, "Login Successful, Hello " + s1);
StaffDashboard.main(args);
signInFrame.setVisible(false);
}
}
else
{
JOptionPane.showMessageDialog(null, "Login Failed");
}
}
// SQL Catch block to catch errors
catch(SQLException s){
}
// Catch block to catch ActionListener errors
catch (Exception e1){
}
};
});