Como comparar dados do Mysql
Olá, boa tarde! Seguinte, estou tentando desenvolver uma aplicação de login, mas encontrei alguns problemas nas hora de comparar os dados do meu BD. Nesta aplicação eu quero que o programa compare o valor digitado no JTextLogin e quando clicar no botão entrar ele me retorne com o nome da pessoa referente ao login digitado em outro frame.
Essa é meu acesso ao BD
public class AcessoMySql {
Connection con;
public Connection conectar(){
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost/teste","root","");
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
System.out.println("Não foi possivel encontrar o Driver!");
} catch (SQLException ex){
ex.printStackTrace();
System.out.println("Não foi possivel conectar ao banco!");
}
return con;
}
public void desconctar(){
try{
con.close();
}catch (SQLException ex){
ex.printStackTrace();
}
}
}
Esse é o meu Bean Pessoapublic class Pessoa {
Integer idPessoa;
String nome;
String login;
String senha;
public int getIdPessoa() {
return idPessoa;
}
public void setIdPessoa(int idPessoa) {
this.idPessoa = idPessoa;
}
public String getNome() {
return nome;
}
public void setNome(String nome) {
this.nome = nome;
}
public String getLogin() {
return login;
}
public void setLogin(String login) {
this.login = login;
}
public String getSenha() {
return senha;
}
public void setSenha(String senha) {
this.senha = senha;
}
}
Esse é o meu PessoaDaopublic class PessoaDao {
Statement stm;
PreparedStatement pstm;
ResultSet rs;
String insereDados = "INSERT INTO PESSOA (codigo) VALUES (null)";
String insereDadosP = "INSERT INTO PESSOA (NOME, LOGIN, SENHA) VALUES (?,?,?)";
String consultaP = "SELECT * FROM PESSOA WHERE LOGIN = ?";
//String consultaUltimo = "SELECT MAX(IDPESSOA) AS IDPESSOA FROM PESSOA";
AcessoMySql bd = new AcessoMySql(); boolean lis = false;
//Pessoa pes = new Pessoa();
try {
pstm = bd.conectar().prepareStatement(consultaP);
pstm.setString(1, login);
rs = pstm.executeQuery();
if(rs.next()){
lis = true;
}
} catch (Exception e) {
e.printStackTrace();
}
return lis;
}
public String retornaUltimoCodigo() {
try {
stm = bd.conectar().createStatement();
rs = stm.executeQuery(consultaP);
//rs.first();
return rs.getString("nome");
} catch (Exception e) {
e.printStackTrace();
} finally {
bd.desconctar();
}
return "";
}
public List<Pessoa> procuraNome(){
String pN = "SELECT * FROM PESSOA";
PreparedStatement stm1;
ResultSet rs1;
List<Pessoa> pe = new ArrayList<>();
try {
stm1 = bd.conectar().prepareStatement(pN);
//stm1 = bd.conectar().prepareStatement(pN);
rs1 = stm1.executeQuery();
//rs1.first();
//Pessoa pess = new Pessoa();
//if(pess.getLogin().equals(rs1.getString("login"))){
while(rs1.next()){
Pessoa pess = new Pessoa();
pess.setNome(rs1.getString("nome"));
//pess.setLogin(rs.getString("login"));
pe.add(pess);
}
} catch (Exception e) {
System.out.println("Erro!" + e);
JOptionPane.showMessageDialog(null, e);
} finally{
bd.desconctar();
}
return pe;
}
Essa é minha tela de loginpublic class testeS extends javax.swing.JDialog {
/**
* Creates new form testeS
*/
public testeS(java.awt.Frame parent, boolean modal) {
super(parent, modal);
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jBRetornaNome = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jTLogin = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
jBRetornaNome.setText("Envia Nome do BD");
jBRetornaNome.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jBRetornaNomeActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(75, 75, 75)
.addComponent(jBRetornaNome, javax.swing.GroupLayout.PREFERRED_SIZE, 200, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(26, 26, 26)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 207, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(112, 112, 112)
.addComponent(jTLogin, javax.swing.GroupLayout.PREFERRED_SIZE, 177, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(111, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(51, 51, 51)
.addComponent(jBRetornaNome, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(51, 51, 51)
.addComponent(jTLogin, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(54, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jBRetornaNomeActionPerformed(java.awt.event.ActionEvent evt) {
comparaLoBD();
//retornaNome();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(testeS.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(testeS.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(testeS.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(testeS.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the dialog */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
testeS dialog = new testeS(new javax.swing.JFrame(), true);
dialog.addWindowListener(new java.awt.event.WindowAdapter() {
@Override
public void windowClosing(java.awt.event.WindowEvent e) {
System.exit(0);
}
});
dialog.setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jBRetornaNome;
private javax.swing.JLabel jLabel1;
private javax.swing.JTextField jTLogin;
// End of variables declaration
private Pessoa pessoa;
private Controle controle;
private testeP p1;
public void comparaLoBD(){
PessoaDao pd = new PessoaDao();
testeP a = new testeP();
for(Pessoa p: pd.procuraNome()){
if(pd.listarPessoaNome(jTLogin.getText())){
dispose();
a.retJlabel(p.getNome());
a.setVisible(true);
}else{
JOptionPane.showMessageDialog(null, "Erro ao comparar os valores!");
}
}
}
}
Essa é a tela que vai ser exibida quando houver a comparação do BD com as informações digitada pelo usuariopublic class testeP extends javax.swing.JFrame {
/**
* Creates new form testeP
*/
public testeP() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLRecebeNomeBD = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLRecebeNomeBD.setFont(new java.awt.Font("Meiryo", 1, 24)); // NOI18N
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(27, 27, 27)
.addComponent(jLRecebeNomeBD, javax.swing.GroupLayout.PREFERRED_SIZE, 332, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(41, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(49, 49, 49)
.addComponent(jLRecebeNomeBD, javax.swing.GroupLayout.PREFERRED_SIZE, 77, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(174, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(testeP.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(testeP.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(testeP.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(testeP.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new testeP().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLRecebeNomeBD;
// End of variables declaration
public void retJlabel(String nome){
PessoaDao pd = new PessoaDao();
jLRecebeNomeBD.setText(nome);
jLRecebeNomeBD.setVisible(true);
//}
}
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