如何从 mysql netbeans 验证用户名和密码
How to validate username and password from mysql netbeans
大家好,我想使用 netbeans Jform 从我的 phpmyadmin 数据库验证用户名和密码
这是我的代码
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String a = username.getText();
String b = password.getText();
try {
//configDB is my connnection file to mysql
java.sql.Connection conn = (Connection) config.configDB();
String username = "select username from akun where username='" + a + "';";
String password = "select password from akun where password='" + b + "';";
java.sql.PreparedStatement us = conn.prepareStatement(username);
java.sql.PreparedStatement pw = conn.prepareStatement(password);
us.execute();
pw.execute();
if (a.equals(username.toString()) && b.equals(password.toString())) {
JOptionPane.showMessageDialog(this, "Benar");
} else {
JOptionPane.showMessageDialog(this, "Username or Password is incorrect");
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
} // TODO add your handling code here:
}
试试这个。
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String a = username.getText();
String b = password.getText();
try {
java.sql.Connection conn = (Connection) config.configDB();
String query = "select username, password from akun where username='" + a + "';";
java.sql.PreparedStatement ps = conn.prepareStatement(query);
java.sql.ResultSet resultSet = ps.executeQuery(query);
String un = "";
String pw = "";
while (resultSet.next()) {
un = resultSet.getString("username");
pw = resultSet.getString("password");
}
if (a.equals(us) && b.equals(pw)) {
JOptionPane.showMessageDialog(this, "Benar");
} else {
JOptionPane.showMessageDialog(this, "Username or Password is incorrect");
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
} // TODO add your handling code here:
}
您需要确保您的资源已关闭并正确使用PreparedStatement
:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String a = username.getText();
String b = password.getText();
try {
// configDB is my connnection file to mysql
try (java.sql.Connection conn = (Connection) config.configDB()) {
String username = "select username from akun where username = ? and password = ?";
java.sql.PreparedStatement ps = conn.prepareStatement(username);
java.sql.Result rs = ps.executeQuery();
if (rs.next()) {
JOptionPane.showMessageDialog(this, "Benar");
} else {
JOptionPane.showMessageDialog(this, "Username or Password is incorrect");
}
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
} // TODO add your handling code here:
}
大家好,我想使用 netbeans Jform 从我的 phpmyadmin 数据库验证用户名和密码
这是我的代码
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String a = username.getText();
String b = password.getText();
try {
//configDB is my connnection file to mysql
java.sql.Connection conn = (Connection) config.configDB();
String username = "select username from akun where username='" + a + "';";
String password = "select password from akun where password='" + b + "';";
java.sql.PreparedStatement us = conn.prepareStatement(username);
java.sql.PreparedStatement pw = conn.prepareStatement(password);
us.execute();
pw.execute();
if (a.equals(username.toString()) && b.equals(password.toString())) {
JOptionPane.showMessageDialog(this, "Benar");
} else {
JOptionPane.showMessageDialog(this, "Username or Password is incorrect");
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
} // TODO add your handling code here:
}
试试这个。
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String a = username.getText();
String b = password.getText();
try {
java.sql.Connection conn = (Connection) config.configDB();
String query = "select username, password from akun where username='" + a + "';";
java.sql.PreparedStatement ps = conn.prepareStatement(query);
java.sql.ResultSet resultSet = ps.executeQuery(query);
String un = "";
String pw = "";
while (resultSet.next()) {
un = resultSet.getString("username");
pw = resultSet.getString("password");
}
if (a.equals(us) && b.equals(pw)) {
JOptionPane.showMessageDialog(this, "Benar");
} else {
JOptionPane.showMessageDialog(this, "Username or Password is incorrect");
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
} // TODO add your handling code here:
}
您需要确保您的资源已关闭并正确使用PreparedStatement
:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String a = username.getText();
String b = password.getText();
try {
// configDB is my connnection file to mysql
try (java.sql.Connection conn = (Connection) config.configDB()) {
String username = "select username from akun where username = ? and password = ?";
java.sql.PreparedStatement ps = conn.prepareStatement(username);
java.sql.Result rs = ps.executeQuery();
if (rs.next()) {
JOptionPane.showMessageDialog(this, "Benar");
} else {
JOptionPane.showMessageDialog(this, "Username or Password is incorrect");
}
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
} // TODO add your handling code here:
}