Trying to run a query

Question

I'm trying to run a query in a JTextField and then have that query display the output in a JTable. When I try to use .getText() to store the query in a string I keep getting errors about SQLException. Can anyone lend me in hand in telling me what I'm doing wrong?
This is the error I get when the line below would say:
query=jtf.getText();
c:\java>java myguidemo
Exception in thread "main" java.sql.SQLException: Invalid SQL type
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java
:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java
:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java
:208)
at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:67)
at oracle.jdbc.driver.T4CStatement.executeForRows(T4CStatement.java:946)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStateme
nt.java:1169)
at oracle.jdbc.driver.OracleStatement.doScrollExecuteCommon(OracleStatem
ent.java:4044)
at oracle.jdbc.driver.OracleStatement.doScrollStmtExecuteQuery(OracleSta
tement.java:4196)
at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:
1280)
at myguidemo.<init>(myguidemo.java:39)
at myguidemo.main(myguidemo.java:106)
c:\java>
Here is what I have so far. I took out the oracle IP and login. This is a working version, but where query = "SELECT * ....." I would like that to get whatever is typed in the JTextField. Also button1-5 is supposed to display the entire table in the JTable just by clicking it. Right now I just have them to change background color to make sure they worked.
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class myguidemo extends JFrame implements ActionListener{
          Connection connection;
          Statement stmt;
          String query;
          ResultSet results;
          ResultSetMetaData md;
          int numrows, numcols;
          AbstractTableModel dataModel;
          Object [][] data;
JTextField jtf;
JTable jtb;
JPanel jp;
JScrollPane jsp;
JButton button1, button2, button3, button4, button5;
public myguidemo() throws Exception{
          Class.forName( "oracle.jdbc.driver.OracleDriver" );
          connection = DriverManager.getConnection("jdbc:oracle:thin:@);
          jp = new JPanel();
          add(jp,BorderLayout.SOUTH);
jtb = new JTable();
add(jtb,BorderLayout.CENTER);
jtf = new JTextField();
add(jtf,BorderLayout.NORTH);
query = "SELECT * FROM PATIENT";
stmt = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
results = stmt.executeQuery(query);
md = results.getMetaData();
          numcols = md.getColumnCount();
          numrows = 0;
          while(results.next()) numrows++;
          results.beforeFirst();
          data = new Object[numrows][numcols];
          results.next();
          for(int i=0; i<numrows; i++){
               for(int j=1; j<=numcols; j++){
                    data[i][j-1] = results.getString(j);
               results.next();
dataModel = new AbstractTableModel(){
     public int getColumnCount() {return numcols;}
     public int getRowCount() {return numrows;}
     public Object getValueAt(int row, int col) {return data[row][col];}
jtf.addActionListener(this);
jtb = new JTable(dataModel);
jsp = new JScrollPane(jtb);
add(jsp);
button1 = new JButton("Doctor");
button2 = new JButton("Medication");
button3 = new JButton("Patient");
button4 = new JButton("Prescription");
button5 = new JButton("Supplier");
jp.add(button1);
jp.add(button2);
jp.add(button3);
jp.add(button4);
jp.add(button5);
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
button4.addActionListener(this);
button5.addActionListener(this);
setTitle("CSIT");
setSize(1280,720);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
public void actionPerformed(ActionEvent e){
if (e.getSource() == jtf){
     jtf.setText("");
if (e.getSource() == button1) jtb.setBackground(Color.RED);
if (e.getSource() == button2) jtb.setBackground(Color.GREEN);
if (e.getSource() == button3) jtb.setBackground(Color.BLUE);
if (e.getSource() == button4) jtb.setBackground(Color.ORANGE);
if (e.getSource() == button5) jtb.setBackground(Color.YELLOW);
public static void main(String args[]) throws Exception{
     new myguidemo();
Edited by: rizzo18 on Dec 12, 2009 1:46 PM
Edited by: rizzo18 on Dec 12, 2009 2:06 PM

Answer 1

I'm trying to run a query in a JTextField and then have that query display the output in a JTable.1. Write classes that only do JDBC. If there is any GUI code at all in them then it is wrong.
2. Test those classes and modify until they work.
3. Use those classes in your GUI code (other classes) to do what you want.
Questions about 1 and 2 go in this forum. Questions about 3 go into a GUI forum.
Use code tags when you post code.