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Re: Trouble with Informix JDBC 3.00 and Java

Posted By: GUSTAVO ECHENIQUE
Date: Sunday, 25 September 2011, at 7:13 p.m.

In Response To: Re: Trouble with Informix JDBC 3.00 and Java (Marcus Haarmann)

Hi Marcus!, thanks for replying.

You're right, maybe some code with a better understanding of the problem.

The following is part of the controller class:

import java.util.Observable;
import java.sql.*;
import javax.swing.*;
import com.informix.jdbc.*;
import java.io.*;
import java.io.FileWriter;
import java.io.PrintWriter; //Estas dos últimas importaciones son para el trace del JDBC

public class ConexionMotor{

public void cargarDriver() throws ClassNotFoundException{

try{

Class.forName("com.informix.jdbc.IfxDriver");

//System.out.println("Se conectó perfectamente con el Informix JDBC driver");

}

catch(ClassNotFoundException excepcion){

JOptionPane.showMessageDialog(null, "ERROR: falló la carga del Informix JDBC driver. \n" + excepcion.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

return;

}

}

public void crearConexion(String nombreMaquina, String nombreBase, String nombreInstancia, String nombreUsuario, String passwordUsuario) throws SQLException{

try{

connection = DriverManager.getConnection("jdbc:informix-sqli://" + nombreMaquina + ":1526/" + nombreBase + ":INFORMIXSERVER=" + nombreInstancia + ";user=" + nombreUsuario + ";password=" + passwordUsuario);

//connection = DriverManager.getConnection("jdbc:informix-sqli://" + nombreMaquina + ":1526/" + nombreBase + ":INFORMIXSERVER=" + nombreInstancia + ";user=" + nombreUsuario + ";password=" + passwordUsuario + ";TRACE=3;TRACEFILE=C:\\tmp\\traza.log;PROTOCOLTRACE=2;PROTOCOLTRACEFILE=C:\\tmp\\trace.out");

connection.setAutoCommit(true);

//connection.setTransactionIsolation(Connection.TRANSACTION_REPEATABLE_READ);

//Acá hacemos el trace del JDBC

//JDBC trace to file

FileWriter fwTrace = new FileWriter("c:\\tmp\\JDBCTrace.log");

PrintWriter pwTrace= new PrintWriter(fwTrace);

DriverManager.setLogWriter(pwTrace);

}

catch(SQLException excepcion){

JOptionPane.showMessageDialog(null, "ERROR: No se pudo establecer la conexión con la base. \n" + excepcion.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

return;

}

catch(Exception e){

JOptionPane.showMessageDialog(null, "ERROR: No se pudo cargar el trazador de JDBC. \n" + e.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

return;

}

}

public ResultSet generarResultSet(String sentenciaPasada) throws SQLException{

//aquí la variable "sentencia" pasada como parámetro, debe ser del tipo SQL.

//este método se utiliza solamente para los queries comunes (que no involucran INSERT, UPDATE y DELETE), es decir, para los queries que generarán el ResultSet

try {

resultado = null;

sentenciaPreparada = null;

metaResultado = null;

sentenciaPreparada = connection.prepareStatement(sentenciaPasada, ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);

resultado = sentenciaPreparada.executeQuery();

return resultado;

}

catch(SQLException excepcion){

JOptionPane.showMessageDialog( null, "ERROR: fallo la ejecución de la sentencia. \n" + excepcion.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

//System.out.println("ERROR: " + e.getMessage());

return null;

}

}

-----
What follows below is the model class:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.sql.*;
import java.util.*;

public class ModeloTablaMarcas extends AbstractTableModel implements TableModel, TableModelListener{

public ModeloTablaMarcas(){

conexion = new ConexionMotor();

try{

conexion.cargarDriver();

}

catch(ClassNotFoundException cnfe){

JOptionPane.showMessageDialog(null,"Error al cargar el Driver JDBC de Informix:" + cnfe.getMessage(), "Atención",JOptionPane.INFORMATION_MESSAGE );

}

try{

conexion.crearConexion( "proliant", "pruebas", "ol_develop", "informix", "informix");

}

catch(SQLException sqle){

JOptionPane.showMessageDialog(null,"Error de lenguaje SQL al intentar la conexión:" + sqle.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE );

}

try{

resultado = conexion.generarResultSet("SELECT idmarca, descripcion FROM \"informix\".garr_marcas ORDER BY 1");

}

catch(SQLException sqle){

JOptionPane.showMessageDialog(null,"Error de lenguaje SQL al ejecutar la consulta:" + sqle.getMessage(),"Atención", JOptionPane.INFORMATION_MESSAGE );

}

try{

metaResultado = conexion.obtenerMetaDatos(resultado);

}

catch(SQLException sqle){

JOptionPane.showMessageDialog(null,"Error de lenguaje SQL al obtener MetaDatos:" + sqle.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE );

}

JOptionPane.showMessageDialog(null,resultado.toString() +"\n" + "Cantidad de Filas:" + getRowCount() + "\n" + "Cantidad de Columnas:" + getColumnCount(), "Atención", JOptionPane.INFORMATION_MESSAGE );

suscriptores = new LinkedList();

}

public void addTableModelListener (TableModelListener oyente) {

suscriptores.add (oyente);

JOptionPane.showMessageDialog(null, "Se ha agregado un nuevo oyente de eventos. \n En este momento hay: " + suscriptores.size(),"JDBC-Atención", JOptionPane.INFORMATION_MESSAGE);

}

public void removeTableModelListener (TableModelListener oyente) {

suscriptores.remove(oyente);

}

public void setValueAt(Object datos, int fila, int columna){

;

}

public Object getValueAt( int fila, int columna ){

try{

if(resultado.isBeforeFirst()){

resultado.first();

}

else if(resultado.isAfterLast()){

resultado.last();

}

resultado.absolute(fila+1);

return resultado.getObject(columna+1);

}

catch(SQLException sqle){

//System.out.println(resultado.getObject(columna+1));

JOptionPane.showMessageDialog( null, "Error de lenguaje SQL al obtener el valor de la celda:" + sqle.getMessage(), "Atención-getValueAt", JOptionPane.INFORMATION_MESSAGE);

return null;

}

}

public boolean isCellEditable( int fila, int columna ){

return false;

}

public Class getColumnClass( int clase ){

try{

return Class.forName(metaResultado.getColumnClassName(clase+1));

}

catch(ClassNotFoundException cnfe){

JOptionPane.showMessageDialog( null, "Error al determinar la clase de la columna:" + cnfe.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

return null;

}

catch(SQLException sqle){

JOptionPane.showMessageDialog( null, "Error de lenguaje SQL:" + sqle.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

return null;

}

}

public String getColumnName( int columna){

try{

return metaResultado.getColumnName(columna + 1);

}

catch(SQLException sqle){

JOptionPane.showMessageDialog( null, "Error de lenguaje SQL al obtener el nombre de la columna:" + sqle.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

return null;

}

}

public int getColumnCount(){

try{

return metaResultado.getColumnCount();

}

catch(SQLException sqle){

JOptionPane.showMessageDialog( null, "Error de lenguaje SQL al obtener el número de columnas:" + sqle.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

return 0;

}

}

public int getRowCount(){

try{

resultado.last();

ultimaFila = resultado.getRow();

resultado.moveToCurrentRow();

return ultimaFila;

}

catch(SQLException sqle){

JOptionPane.showMessageDialog( null, "Error de lenguaje SQL al obtener el total de filas:" + sqle.getMessage(), "Atención", JOptionPane.INFORMATION_MESSAGE);

return 0;

}

}

/**

Este método se tiene que implementar para cumplimentar lo requerido por la interfaz TableModelListener

*/

public void tableChanged(TableModelEvent e){

//e.fireTableChanged(); //Esta verga no funciona con el TableModel, sino con el AbstractTableModel

//for ( int i=0; i<suscriptores.size(); i++){

// ((TableModelListener)suscriptores.get(i)).tableChanged(e);

fireTableDataChanged();

// JOptionPane.showMessageDialog(null, "Suscriptor Número:" + i + "\n Elementos:" + suscriptores.get(i).toString(), "Modelo-Atención", JOptionPane.INFORMATION_MESSAGE);

// System.out.println("Entró en el método tableChanged");

//}

}

protected ConexionMotor conexion;

protected ResultSet resultado;

private ResultSetMetaData metaResultado;

private int ultimaFila;

private LinkedList suscriptores;

private int cantColumnas;

} //Fin de la clase ModeloTablaMarcas
-----
subscribe to this class that has the JTable

Thanks!

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