Problemas de conexión con MySQL
Publicado por Arturo (16 intervenciones) el 24/03/2020 04:52:54
Buenas noches
Alguien que me pueda ayudar con este problema que tengo, llevo días intentando conectar Netbeans usando XAMPP a la base creada en MySQL.
Eh probado diferentes códigos y aun así no eh logrado la conexión, espero su ayuda por favor.
Lo que necesito es que el botón guardar pueda hacer esa acción también en la base de datos, pero no logra guardar nada con la conexión.
Este es el código de conexión a la base de datos
Y está parte es del menú inventario que pasa al submenú AltasInventario.
Ahora, este es el error que me sale:
ESPERO SU AYUDA POR FAVOR, GRACIAS.
Alguien que me pueda ayudar con este problema que tengo, llevo días intentando conectar Netbeans usando XAMPP a la base creada en MySQL.
Eh probado diferentes códigos y aun así no eh logrado la conexión, espero su ayuda por favor.
Lo que necesito es que el botón guardar pueda hacer esa acción también en la base de datos, pero no logra guardar nada con la conexión.
Este es el código de conexión a la base de datos
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import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;
import java.sql.DriverManager;
import java.sql.SQLException;
/** * * @author Arturo R C */public class conectarBD {static Statement sentencia;
Connection con = null;public Connection Conexion() throws SQLException, ClassNotFoundException {
try {Class.forName("com.mysql.jdbc.Driver");
con = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/proyecto?useSSL=false", "root", "1q2w3e4r5t6y");
sentencia = (Statement) con.createStatement();
System.out.println("Conexion exitosa con Base de Datos");
} catch(SQLException | ClassNotFoundException ex) {
System.out.println("Error con la conexion de Base de Datos"+ex.getMessage());
}return con;
}}Y está parte es del menú inventario que pasa al submenú AltasInventario.
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import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. *//** * * @author Arturo R C */public class AltasInventario extends javax.swing.JInternalFrame {
DefaultTableModel modelo;
conectarBD cc = new conectarBD();
/** * Creates new form Altas */public AltasInventario() {
initComponents();
modelo = new DefaultTableModel();
modelo.addColumn("codigo");
modelo.addColumn("articulo");
modelo.addColumn("sucursal");
modelo.addColumn("existencia");
modelo.addColumn("marca");
this.tabladealtas.setModel(modelo);
} /** * 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() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
txtcodigoinv = new javax.swing.JTextField();
txtarticuloinv = new javax.swing.JTextField();
txtsucursalinv = new javax.swing.JTextField();
txtexistenciainv = new javax.swing.JTextField();
txtmarcainv = new javax.swing.JTextField();
jScrollPane1 = new javax.swing.JScrollPane();
tabladealtas = new javax.swing.JTable();
btnguardar = new javax.swing.JButton();
btnlimpiar = new javax.swing.JButton();
btneditar = new javax.swing.JButton();
btnsalir = new javax.swing.JButton();
setClosable(true);
setIconifiable(true);
setMaximizable(true);
setResizable(true);
setTitle("Altas Inventario");
jLabel1.setText("codigo");
jLabel2.setText("articulo");
jLabel3.setText("sucursal");
jLabel4.setText("existencia");
jLabel5.setText("marca");
tabladealtas.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"codigo", "articulo", "sucursal", "existencia", "marca"
}));
jScrollPane1.setViewportView(tabladealtas);
btnguardar.setText("GUARDAR");
btnguardar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnguardarActionPerformed(evt);
}});
btnlimpiar.setText("LIMPIAR");
btnlimpiar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnlimpiarActionPerformed(evt);
}});
btneditar.setText("EDITAR");
btnsalir.setText("SALIR");
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(21, 21, 21)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel5)
.addComponent(jLabel4)
.addComponent(jLabel3)
.addComponent(jLabel2)
.addComponent(jLabel1))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(txtmarcainv, javax.swing.GroupLayout.DEFAULT_SIZE, 189, Short.MAX_VALUE)
.addComponent(txtexistenciainv)
.addComponent(txtsucursalinv)
.addComponent(txtarticuloinv)
.addComponent(txtcodigoinv))
.addGap(60, 60, 60)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(btnguardar)
.addComponent(btnlimpiar)
.addComponent(btneditar)
.addComponent(btnsalir)))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 442, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(20, Short.MAX_VALUE))
);layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(32, 32, 32)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(txtcodigoinv, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnguardar))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(txtarticuloinv, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnlimpiar))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(txtsucursalinv, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btneditar))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4)
.addComponent(txtexistenciainv, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnsalir))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel5)
.addComponent(txtmarcainv, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(38, 38, 38)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 170, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);pack();
}// </editor-fold>
private void btnlimpiarActionPerformed(java.awt.event.ActionEvent evt) {
txtcodigoinv.setText("");
txtarticuloinv.setText("");
txtsucursalinv.setText("");
txtexistenciainv.setText("");
txtmarcainv.setText("");
}private void btnguardarActionPerformed(java.awt.event.ActionEvent evt) {
try {String []info = new String[5];
info[0]= txtcodigoinv.getText();
info[1]= txtarticuloinv.getText();
info[2]= txtsucursalinv.getText();
info[3]= txtexistenciainv.getText();
info[4]= txtmarcainv.getText();
modelo.addRow(info);
txtcodigoinv.setText("");
txtarticuloinv.setText("");
txtsucursalinv.setText("");
txtexistenciainv.setText("");
txtmarcainv.setText("");
//** Llamamos al objeto conexión, donde se declara una variable donde se conectara a la base de datos de MySQL.Connection cn = cc.Conexion();
String codigo, articulo, sucursal, existencia, marca;
String sql="";
codigo = txtcodigoinv.getText();
articulo = txtarticuloinv.getText();
sucursal = txtsucursalinv.getText();
existencia = txtexistenciainv.getText();
marca = txtmarcainv.getText();
sql="INSERT INTO inventario (codigo, articulo, sucursal, existencia, marca) VALUES (?, ?, ?,?, ?)";
try {PreparedStatement pst = (PreparedStatement) cn.prepareStatement(sql);
pst.setString(1, codigo);
pst.setString(2, articulo);
pst.setString(3, sucursal);
pst.setString(4, existencia);
pst.setString(5, marca);
int n=pst.executeUpdate();
if (n>0){
JOptionPane.showMessageDialog(null, "Registro guardado");
}} catch (SQLException ex) {
Logger.getLogger(AltasInventario.class.getName()).log(Level.SEVERE, null, ex);
}} catch (SQLException ex) {
Logger.getLogger(AltasInventario.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(AltasInventario.class.getName()).log(Level.SEVERE, null, ex);
} } // Variables declaration - do not modifyprivate javax.swing.JButton btneditar;
private javax.swing.JButton btnguardar;
private javax.swing.JButton btnlimpiar;
private javax.swing.JButton btnsalir;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable tabladealtas;
private javax.swing.JTextField txtarticuloinv;
private javax.swing.JTextField txtcodigoinv;
private javax.swing.JTextField txtexistenciainv;
private javax.swing.JTextField txtmarcainv;
private javax.swing.JTextField txtsucursalinv;
// End of variables declaration}Ahora, este es el error que me sale:
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Error con la conexion de Base de DatosUnknown database 'proyecto'Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at Actividad4.AltasInventario.btnguardarActionPerformed(AltasInventario.java:217)
at Actividad4.AltasInventario.access$000(AltasInventario.java:24)
at Actividad4.AltasInventario$1.actionPerformed(AltasInventario.java:97)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6539)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6304)
at java.awt.Container.processEvent(Container.java:2239)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2297)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4535)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4476)
at java.awt.Container.dispatchEventImpl(Container.java:2283)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
BUILD SUCCESSFUL (total time: 12 seconds)
ESPERO SU AYUDA POR FAVOR, GRACIAS.
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